TMS29VF040-15C5DDE4 [TI]
512KX8 FLASH 3V PROM, 150ns, PDSO32;
| 型号： | TMS29VF040-15C5DDE4 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 512KX8 FLASH 3V PROM, 150ns, PDSO32 可编程只读存储器 光电二极管 内存集成电路 |
| 文件： | 总38页 (文件大小：481K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
FM PACKAGE
(TOP VIEW)
D
Single Power Supply
3.3 V 0.3 V − TMS29LF040
2.7 V to 3.6 V − TMS29VF040
5 V 10% − See TMS29F040 Data sheet
(Literature Number SMJS820)
4
3 2 1 32 31 30
D
D
Organization . . . 524288 By 8 Bits
5
29
28
27
26
25
24
23
22
21
A7
A6
A14
A13
A8
6
Eight Equal Sectors of 64K Bytes
− Any Combination of Sectors Can Be
Erased
− Any Combination of Sectors Can Be
Marked as Read-Only
7
A5
8
A4
A9
9
A3
A11
G
10
11
12
13
A2
A1
A10
E
D
D
Compatible With JEDEC Electrically
Erasable Programmable Read-Only
Memory (EEPROM) Command Set
A0
DQ0
DQ7
14 15 16 17 18 19 20
Fully Automated On-Chip Erase and
Byte-Program Operations
D
D
D
D
100000 Program/Erase Cycles
Erase-Suspend/Erase-Resume Operation
Compatible With JEDEC Byte-Wide Pinouts
PIN NOMENCLATURE
A[0:18]
DQ[0:7]
E
Address Inputs
Low-Current Consumption
− Active Read . . . 20 mA Typical
− Active Program/Erase . . . 30 mA Typical
Inputs (programming)/Outputs
Chip Enable
G
Output Enable
Power Supply
Ground
V
D
All Inputs/Outputs CMOS-Compatible Only
CC
V
SS
W
Write Enable
description
The TMS29LF040 and TMS29VF040 are 524288 by 8-bit (4194304-bit), low-voltage, single-supply,
programmable read-only memories that can be erased electrically and reprogrammed. These devices are
organized as eight independent 64K-byte sectors and are offered with access times between 80 ns and
150 ns.
An on-chip state machine controls the program and erase operations. The embedded-byte program and
sector/chip-erase functions are fully automatic. The command set is compatible with that of JEDEC 4M-bit
EEPROMs. A suspend/resume feature allows access to unaltered memory sectors during a sector-erase
operation. Data protection of any sector combination is accomplished using a hardware sector-protection
feature.
Device operations are selected by writing JEDEC-standard commands into the command register using
standard microprocessor-write timings. The command register acts as input to an internal state machine that
interprets the commands, controls the erase and programming operations, and outputs the status of the device,
the data stored in the device, and the device algorithm-selection code. On initial power-up operation, the device
defaults to the read mode.
The TMS29xF040 is offered in a 32-pin 8 x 14 mm thin small-outline package (DBW suffix), a 32-pin
8 x 20 mm thin small-outline package (DD suffix), and a 32-pin plastic leaded chip carrier (FM suffix) using
1.27 mm (50-mil) lead pitch.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright 1998, Texas Instruments Incorporated
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1
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ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
DBW and DD PACKAGES
(TOP VIEW)
A11
A9
1
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
G
2
A10
E
A8
3
4
A13
A14
A17
W
DQ7
DQ6
DQ5
DQ4
DQ3
5
6
7
8
V
CC
9
A18
V
SS
10
11
12
13
14
15
16
A16
A15
A12
A7
DQ2
DQ1
DQ0
A0
A6
A1
A5
A2
A4
A3
device symbol nomenclature
TMS29LF040
-10 C5
DBW
L
Temperature Range Designator
= Commercial (0°C to 70°C)
= Extended ( − 40°C to 85°C)
L
E
Package Designator
DD
=
Thin Small-Outline Package
(8 × 20 mm)
DBW = Thin Small-Outline Package
(8 × 14 mm)
= Plastic Leaded Chip Carrier
FM
Program/Erase Endurance
C5 = 100000 Cycles
Speed Designator
’LF040
’VF040
-80 = 80 ns
-90 = 90 ns
-10 = 100 ns
-12 = 120 ns
-15 = 150 ns
-10 = 100 ns
-12 = 120 ns
-15 = 150 ns
V
CC
Range Designator
L = 3.3 V 0.3 V V
V = 2.7 V − 3.6 V V
(Low Voltage)
(Very Low Voltage)
CC
CC
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SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
block diagram
DQ0−DQ7
V
CC
V
CC
Detector
V
SS
Input/Output Buffers
Timer
Command Register
State Control
Erase-Voltage
Generator
W
Program-Voltage
Generator
Data Latch
E
Chip-Enable
Output-Enable
Logic
G
Column-Gating
Column Decoder
A
d
d
r
e
s
s
64K × 8-Bit Array
64K × 8-Bit Array
64K × 8-Bit Array
64K × 8-Bit Array
64K × 8-Bit Array
64K × 8-Bit Array
64K × 8-Bit Array
64K × 8-Bit Array
A0−A18
Row-Decoder
L
a
t
c
h
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SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
memory-sector architecture
7FFFFh
64K-Byte Sector 7
64K-Byte Sector 6
64K-Byte Sector 5
64K-Byte Sector 4
64K-Byte Sector 3
64K-Byte Sector 2
64K-Byte Sector 1
64K-Byte Sector 0
70000h
6FFFFh
60000h
5FFFFh
50000h
4FFFFh
40000h
3FFFFh
30000h
2FFFFh
20000h
1FFFFh
10000h
0FFFFh
00000h
A18 A17 A16 Address Range
Sector 0
Sector 1
Sector 2
Sector 3
Sector 4
Sector 5
Sector 6
Sector 7
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
00000h − 0FFFFh
10000h − 1FFFFh
20000h − 2FFFFh
30000h − 3FFFFh
40000h − 4FFFFh
50000h − 5FFFFh
60000h − 6FFFFh
70000h − 7FFFFh
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SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
operation
Table 1 summarizes the operation modes.
Table 1. Operation Modes
†
FUNCTIONS
MODE
E
G
W
A0
A0
X
A9
A9
X
DQ0−DQ7
A1
A1
X
A6
A6
X
Read
V
IL
V
IL
V
IH
Data out
Output disable
V
IL
V
IH
V
IH
Hi-Z
Hi-Z
Standby and write inhibit
V
IH
X
X
X
X
X
X
V
Mfr. equivalent code 97h
Device equivalent code 94h
Data in
IL
Algorithm-selection mode
V
V
V
V
V
V
V
IL
IL
IH
IL
IL
ID
V
IH
‡
Write
Sector-protect
Sector-protect verify
§¶
V
V
V
V
A0
X
A1
X
A6
X
A9
IL
IH
IL
§
V
V
V
ID
X
IL
ID
IL
§
V
IL
V
IH
V
IL
V
IH
V
V
V
V
Data out
IL
IL
IH
IH
ID
Sector-unprotect
V
ID
V
ID
V
X
X
V
V
X
IL
ID
ID
§
Sector-unprotect verify
V
IL
V
IL
V
IH
V
IL
V
IH
Data out
See
Note 1
See
Note 1
See
Note 1
See
Note 1
See
Note 1
Erase operations
V
IL
V
IH
See Note 1
†
‡
§
¶
X can be V or V
IL IH
.
See Table 3 for valid address and data during write (byte program).
Operation at V = 3.3 V and T = 25°C.
CC
Address pins A12 and A16 = V
A
IH
.
NOTE 1: See Figure 6 through Figure 9.
read mode
To read the output of the TMS29xF040, a low-level logic signal is applied to the E and G pins. When two or more
TMS29xF040 devices are connected in parallel, the output of any one device can be read without interference.
The E pin is power control and is used for device selection. The G pin is output control and is used to gate the
data output onto the bus from the selected device.
The address-access time (t
) is the delay from stable address to valid output data. The chip-enable access
AVQV
time (t
) is the delay from E = V and stable addresses to valid output data. The output-enable access time
ELQV
IL
(t
) is the delay from G = V to valid output data when E = V and addresses are stable for at least the
GLQV
IL IL
duration of t
−t
.
AVQV GLQV
standby mode
The I
supply current is reduced by applying a logic-high level on E to enter the standby mode. In the standby
CC
mode, the outputs are placed in the high-impedance state. Applying a CMOS logic-high level on E reduces the
current to 100 µA maximum.
If the TMS29xF040 is deselected during erasure or programming, the device continues to draw active current
until the operation is complete.
output disable
When either G = V or E = V , output from the device is disabled and the output pins (DQ0−DQ7) are placed
IH
IH
in the high-impedance state.
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ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
algorithm selection mode
The algorithm-selection mode provides access to a binary code that matches the device with its proper
programming- and erase-command operations. This mode is activated when V (11.5 V to 12.5 V) is placed
ID
on address pin A9. Address pins A1 and A6 must be logic low. Two bytes of code are accessed by toggling the
address pin A0 from V to V . All other address pins can be logic low or logic high.
IL
IH
The algorithm-selection code also can be read by using the command register, which is useful when V is not
ID
available to be placed on address pin A9. Table 2 lists the binary algorithm-selection codes for the
TMS29xF040.
†
Table 2. Algorithm-Selection Codes
ALGORITHM SELECTION
Byte 0
Byte 1
A0
0
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
HEX
97h
94h
1
1
0
0
0
0
1
1
0
0
1
1
1
0
1
0
1
†
A1 = V , A6 = V , E = V , G = V
IL IL IL IL
erasure and programming
Erasure and programming of the TMS29xF040 are accomplished by writing a sequence of commands using
standard microprocessor write timings. The commands are written to a command register and input to the
command-state machine (CSM). The CSM interprets the command entered and initiates program, erase,
suspend, and resume operations as instructed. TheCSM acts as the interface between the write-state machine
(WSM) and the external chip operations. The WSM controls all voltage generation, pulse generation,
preconditioning, and verification of the memory contents. Program and sector/chip-erase functions are fully
automatic. When the end of a program or erase operation is reached, the device internally resets to the read
mode. If a byte-program or chip-erase operation is in progress, additional program/erase commands are
ignored until the operation in progress is completed.
command definitions
Device operating modes are selected by writing specific address and data sequences into the command
register. Table 3 defines the valid command sequences. Writing incorrect address and data values or writing
them in the incorrect sequence causes the device to reset to the read mode. The command register does not
occupy an addressable memory location. The register stores the command sequence along with the address
and data needed by the memory array. Commands are written by setting E = V and G = V and bringing W
IL
IH
from V to V . Addresses are latched on the falling edge of W and data is latched on the rising edge of W.
IH
IL
Holding W = V and toggling E is an alternative method. See the byte-program and chip/sector-erase sections
IL
for a more complete description.
6
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SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
command definitions (continued)
†
Table 3. Command Definitions
BUS
COMMAND
1ST CYCLE
ADDR DATA
2ND CYCLE
ADDR DATA
3RD CYCLE
4TH CYCLE 5TH CYCLE 6TH CYCLE
CYCLES
ADDR DATA ADDR DATA ADDR DATA ADDR DATA
‡
Read
1
2
4
4
4
6
6
RA RD
XXXXh F0h
5555h AAh
5555h AAh
5555h AAh
5555h AAh
5555h AAh
RA
RD
§
Reset/Read
2AAAh 55h
2AAAh 55h
2AAAh 55h
2AAAh 55h
2AAAh 55h
5555h F0h
5555h 90h
5555h A0h
5555h 80h
5555h 80h
RA
RA
PA
RD
RD
PD
Algorithm selection
Byte program
Chip erase
5555h AAh
5555h AAh
2AAAh 55h
2AAAh 55h
5555h 10h
SA 30h
Sector erase
Sector-erase suspend
Sector-erase resume
XXXXh B0h Erase-suspend valid during sector-erase operation
XXXXh 30h Erase-resume valid only after erase-suspend
RA
PA
SA
=
=
=
Address of the location to be read
Address of the location to be programmed
Address of the sector to be erased
Addresses A16, A17, and A18 select one of eight sectors
Data to be read at selected address location
Data to be programmed at selected address location
RD
PD
=
=
†
Address pins A15, A16, A17, A18 = V or V for all bus cycle addresses except for program address (PA), sector address (SA), and read address
IL IH
(RA).
‡
§
No command cycles are required when the device is in read mode.
The reset command is required to return to the read mode when the device is in the algorithm-selection mode or if DQ5 goes high.
reset/read command
The read mode is activated by writing either of the two reset command sequences into the command register.
The device remains in this mode until another valid command sequence is input into the command register.
Memory data is available in the read mode and can be read with standard microprocessor read-cycle timing.
On power up, the device defaults to the read mode; therefore, a reset command sequence is not required and
memory data is available.
algorithm-selection command
The algorithm-selection command allows access to a binary code that matches the device with the proper
programming and erase-command operations. After writing the three-bus-cycle command sequence, the first
byte of the algorithm-selection code (97h) can be read from address XX00h. The second byte of the code (94h)
can be read from address XX01h (see Table 2). This mode remains in effect until another valid command
sequence is written to the device.
Sector-protection can be determined using the algorithm-selection command. After issuing the three-bus-cycle
command sequence, the sector-protection status can be read on DQ0. Set address pins A0 = V and A1 = V
IL
IH.
The sector address pins A16, A17, and A18 select the sector to be checked. The remaining address pins can
be V or V . If the sector selected is protected, DQ0 outputs a 1. If the sector selected is not protected, DQ0
IL
IH
outputs a 0. This mode remains in effect until another valid command sequence is written to the device.
byte-program command
Byte-programming is a four-bus-cycle command sequence. The first three bus cycles put the device into the
program-setup state. The fourth bus cycle loads the address location and the data to be programmed into the
device. The addresses are latched on the falling edge of W and the data is latched on the rising edge of W inthe
fourth bus cycle. The rising edge of W starts the byte-program operation. The embedded byte-programming
function automatically provides voltage and timing to program and to verify the cell margin. Any further
commands written to the device during the program operation are ignored.
7
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ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
byte-program command (continued)
Programming can be performed at any address location in any order, resulting in logic 0s being programmed
into the device. Attempting to program a logic 1 into a bit that was previously programmed to a logic 0 causes
the internal pulse counter to exceed the pulse-count limit. This sets the exceed-timing-limit indicator (DQ5) to
a logic-high state. Only an erase operation can change bits from logic 0s to logic 1s. When erased, all bits
become logic 1. Figure 3 shows a flow chart of the typical byte-programming operation.
The status of the device during the automatic programming operation can be monitored for completion using
the data-polling feature or the toggle-bit feature. See the operation status section for a full description.
chip-erase command
Chip erase is a six-bus-cycle command sequence. The first three bus cycles put the device into the erase-setup
state. The next two bus cycles unlock the erase mode and then the sixth bus cycle loads the chip-erase
command. This command sequence is required to ensure that the memory contents are not erased accidentally.
The rising edge of W starts the chip-erase operation. Any further commands written to the device during the
chip-erase operation are ignored.
The embedded chip-erase function automatically provides the voltage and timing needed to program and verify
all the memory cells prior to electrical erase, and then erases and verifies the cell margin automatically. The user
is not required to program the memory cells prior to erase. The status of the device during the automatic
chip-erase operation can be monitored for completion using the data-polling feature or the toggle-bit feature.
See the operation status section for a full description. Figure 6 shows a flow chart of the typical chip-erase
operation.
sector-erase command
Sector erase is a six-bus-cycle command sequence. The first three bus cycles cause the device to go into the
erase-setup state. The next two bus cycles unlock the erase mode, and the sixth bus cycle loads the
sector-erase command and the sector-address location to be erased. Any address location within the desired
sector can be used. The addresses are latched on the falling edge of W and the sector-erase command (30h)
is latched on the rising edge of W in the sixth bus cycle. After a delay of 80 µs from the rising edge of W, the
sector-erase operation begins on the selected sector(s).
Additional sectors can be selected to be erased concurrently during the sector-erase command sequence. For
each additional sector to be selected for erase, another bus cycle is issued. The bus cycle loads the next
sector-address location and the sector-erase command. The time between the end of the previous bus cycle
and the start of the next bus cycle must be less than 80 µs; otherwise, the new sector location is not loaded.
A time delay of 80 µs from the rising edge of the last W starts the sector-erase operation. If there is a falling edge
of W within the 80-µs time delay, the timer is reset.
One to eight sector-address locations can be loaded in any order. The state of the delay timer can be monitored
using the sector-erase delay indicator (DQ3). If DQ3 is logic-low, the time delay has not expired. See the
operation status section for a description.
Any command other than erase suspend (B0h) or sector erase (30h) written to the device during the
sector-erase operation causes the device to exit the sector-erase mode and the contents of the sector(s)
selected for erase are no longer valid. To complete the sector-erase operation, the sector-erase command
sequence must be repeated.
The embedded sector-erase function automatically provides needed voltage and timing to program and to verify
all of the memory cells prior to electrical erase and then erases and verifies the cell margin automatically.
Programming the memory cells prior to erase is not required. The status of the device during the automatic
sector-erase operation can be monitored for completion by using the data-polling feature or the toggle-bit
feature. See the operation status section for a full description. Figure 8 shows a flow chart of the typical
sector-erase operation.
8
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
erase-suspend command
The erase-suspend command (B0h) allows interruption of a sector-erase operation to read data from unaltered
sectors of the device. Erase-suspend is a one-bus-cycle command. The addresses can be V or V and the
IL
IH
erase-suspend command (B0h) is latched on the rising edge of W. Once the sector-erase operation is in
progress, the erase-suspend command requests the internal write-state machine to halt operation at
predetermined breakpoints. The erase-suspend command is valid only during the sector-erase operation and
is invalid during the byte-programming and chip-erase operations. The sector-erase delay timer expires
immediately if the erase-suspend command is issued while the delay is active.
After the erase-suspend command is issued, the device typically takes between 0.1 µs and 15 µs to suspend
the operation. The toggle bit must be monitored to determine when the suspend has been executed. When the
toggle bit stops toggling, data can be read from sectors that are not selected for erase. Reading from a sector
selected for erase can result in invalid data. See the operation status section for a full description.
Once the sector-erase operation is suspended, further writes of the erase-suspend command are ignored. The
erase-resume command (30h) causes the device to restart the suspended sector operation. To erase additional
sectors, reissue the six-cycle sector-erase command sequence. Any other command sequence written while
in suspend mode causes the device to reset to the read mode.
erase-resume command
The erase-resume command (30h) restarts a suspended sector-erase operation from where it was halted to
completion. Erase resume is a one-bus-cycle command. The addresses can be V or V and the erase-resume
IL
IH
command (30h) is latched on the rising edge of W. When an erase-suspend/erase-resume command
combination is written, the internal pulse counter is reset to zero and the exceed-timing-limit indicator (DQ5)
is set to logic-low. The erase-resume command is valid only in the erase-suspend state. After the erase-resume
command is executed, the device returns to the valid sector-erase state and further writes of the erase-resume
command are ignored. After the device has resumed the sector-erase operation, another erase-suspend
command can be issued to the device.
operation status
status-bit definitions
During operation of the embedded program and erase functions, the status of the device can be determined
by reading the data state of designated outputs. The data-polling bit (DQ7) and toggle bit (DQ6) require multiple
successive reads to observe a change in the state of the designated output. Table 4 defines the values of the
status flags.
†
Table 4. Operation Status Flags
‡
Device Operation
DQ7
DQ7
DQ7
D
DQ6
T
DQ5
DQ4
X
DQ3
DQ2
X
DQ1
X
DQ0
X
Byte-programming in progress
Byte-programming exceed time limit
Byte-programming complete
0
1
D
0
1
1
0
0
D
1
1
1
T
X
X
X
X
D
D
D
D
D
Sector-/chip-erase in progress
Sector-/chip-erase exceed time limit
Sector-/chip-erase complete
0
T
X
X
X
X
0
T
X
X
X
X
1
1
1
1
1
1
†
‡
T= toggle, D = data, X = data undefined, DQ7 = complement of data written to DQ7
DQ4, DQ2, DQ1, and DQ0 are reserved for future use.
9
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
data-polling (DQ7)
The data-polling status function outputs the complement of the data latched into the DQ7 data register while
the write-state machine is engaged in a program or erase operation. Data bit DQ7 changing from complement
to true indicates the end of an operation. Data-polling is available only during the byte-programming, chip-erase,
sector-erase, and sector-erase timing delay. Data-polling is valid after the rising edge of W in the last bus cycle
of the command sequence loaded into the command register. Figure 10 shows a flow chart of the data-polling
operation.
During a byte-program operation, reading DQ7 outputs the complement of the DQ7 data to be programmed at
the selected address location. Upon completion, reading DQ7 outputs the true DQ7 data loaded into the
program data register. During the erase operations, reading DQ7 outputs a 0. Upon completion of erase
operations, reading DQ7 outputs a 1. Also, data-polling must be performed at a sector address that is within
a sector being erased; otherwise, the status is invalid. When using data-polling, the address must remain stable
throughout the operation.
During a data-polling read, while G is low, data bit DQ7 can change asynchronously with the other DQs.
Depending on the read timing, the system can read valid data on DQ7, while other DQ pins are still invalid. The
data on DQ0−DQ7 is valid with a subsequent read of the device. Figure 11 shows the data-polling timing
diagram.
toggle bit (DQ6)
The toggle-bit status function outputs data on DQ6 that toggles between logic 1 and logic 0 while the write-state
machine is engaged in a program or erase operation. When toggle bit DQ6 stops toggling after two consecutive
reads to the same address, the operation is complete. The toggle bit is only available during the
byte-programming, chip-erase, sector-erase, and sector-erase timing delay. Toggle-bit data is valid after the
rising edge of W in the last bus cycle of the command sequence loaded into the command register. Figure 12
shows a flow chart of the toggle-bit status-read algorithm. Depending on the read timing, DQ6 can stop toggling
while other DQ pins are still invalid. The data on DQ0−DQ7 is valid with a subsequent read of the device.
Figure 13 shows the toggle-bit timing diagram.
exceed-time-limit (DQ5)
The program and erase operations use an internal pulse counter to limit the number of pulses applied. If the
pulse count limit is exceeded, DQ5 is set to a logic 1, indicating that the program or erase operation has failed.
DQ7 does not change from complemented data to true data and DQ6 does not stop toggling when read. The
device must be reset to continue operation.
This condition occurs when attempting to program a logic 1 into a bit that has been programmed previously to
a logic 0. Only an erase operation can change bits from 0 to 1. After reset, the device is functional and can be
erased and reprogrammed.
sector-load-timer bit (DQ3)
The sector-load-timer status bit, DQ3, is used to determine whether the time to load additional sector addresses
has expired. After completion of a sector-erase command sequence, DQ3 remains at a logic 0 for 80 µs. This
indicates that another sector-erase command sequence can be issued. If DQ3 is at a logic 1, it indicates that
the delay has expired and attempts to issue additional sector-erase commands are ignored. See the
sector-erase command section for a description.
The data-polling bit and toggle bit are valid during the 80-µs time delay and can be used to determine if a valid
sector-erase command has been issued. To ensure additional sector-erase commands have been accepted,
the status of DQ3 should be read before and after each additional sector-erase command. If DQ3 is at a logic
low on both reads, then the additional sector-erase command was accepted.
10
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅ
ꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
data protection
hardware-sector protection feature
This feature disables both programming and erase operations on any combination of one to eight sectors.
Commands to program or erase a protected sector do not change the data contained in the sector. The
data-polling and toggle bits operate for 2 µs to 100 µs and then return to valid data. This feature is enabled using
high-voltage V (11.5 V to 12.5 V) on address pin A9 and control pin G, and V on control pin E. Figure 14 shows
ID
IL
a flow chart of the sector-protect operation.
The device is delivered with all sectors unprotected. The sector-unprotect mode is available to unprotect
protected sectors. Figure 16 is a flow chart of the sector-unprotect operation.
sector-protect operation
The sector-protect mode is activated when V
= 3.3 V (operating at T = 25°C), W = V , E= V , and address
A IH IL
CC
pin A9 and control pin G are forced to V . The sector-select address pins A16, A17, and A18 are used to select
ID
the sector to be protected. Address pins A0−A8, A10−A15, and I/O pins DQ0−DQ7 must be stable and can be
V
or V . Once the addresses are stable, W is pulsed low for 100 µs. The operation begins on the falling edge
IL
IH
of W and terminates on the rising edge of W. Figure 15 shows a timing diagram of the sector-protect operation.
sector-protect verify
Verification of sector-protection is activated when V
= 3.3 V (operating at T = 25°C), W = V , G = V ,
A IH IL
CC
E = V , and address pin A9 = V . Address pins A0 and A6 are set to V , and A1 is set to V . The sector-address
IL
ID
IL
IH
pins A16, A17, and A18 select the sector to be verified. The other address pins can be V or V . If the sector
IH
IL
selected is protected, the DQs output 01h. If the sector selected is not protected, the DQs output 00h.
sector-unprotect operation
Prior to a sector-unprotect operation, all sectors should be protected using the sector-protect mode.
Sector-unprotect mode is activated when V
= 3.3 V (operating at T = 25°C), W = V , and address pin A9
CC
A IH
and control pins G and E are forced to V . Address pins A6, A12, and A16 are set to V . The sector-select
ID
IH
address pins A17 and A18 can be V or V . All eight sectors are unprotected in parallel. Once the inputs are
IL
IH
stable, W is pulsed low for 10 ms. The unprotect operation begins on the falling edge of W and terminates on
the rising edge of W. Figure 17 shows a timing diagram of the sector-unprotect operation.
sector-unprotect verify
Verification of the sector-unprotection is activated when V
= 3.3 V (operating at T = 25°C), W = V ,
A IH
CC
G = V , E = V , and address pin A9 = V . The sector to be verified must be selected. Address pins A1 and
IL
IL
ID
A6 are set to V , and A0 is set to V . The other address pins can be V or V . If the sector that is selected
IH
IL
IH
IL
is protected, the DQs output 01h. If the sector selected is not protected, the DQs output 00h.
glitching
Pulses of less than 5 ns (typical) on G, W, or E do not issue a write cycle.
power supply considerations
Each device should have a 0.1-µF ceramic capacitor connected between V
and V to suppress circuit noise.
SS
CC
Printed-circuit traces to V
should be appropriate to handle the current demand and minimize inductance.
CC
11
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
†
absolute maximum ratings over operating ambient temperature range (unless otherwise noted)
Voltage range with respect to ground:
Supply voltage range, V
(see Note 2) . . . . . . . . . . . . . . . . . . . . . −0.5 V to + 3.6 V
CC
All pins except A9, E, G (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to + 3.6 V
A9, E, G (see Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to + 13.5 V
Ambient temperature range during read/erase/program, T
A
Commercial (L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Extended (E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 40°C to 85°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
Storage temperature range, T
stg
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 2. Minimum dc voltage on input or I/O pins is −0.5 V. During voltage transitions, input or I/O pins may undershoot V
to −2.0 V for
SS
periods of up to 20 ns. Maximum dc voltage on input and I/O pins is +3.6 V. During voltage transitions, input and I/O pins may
overshoot to V + 2.0 V for periods up to 20 ns.
CC
3. Minimum dc input voltage on A9, E, and G pins is −0.5 V. During voltage transitions, A9, E, and G may undershoot V
to −2.0 V
SS
for periods of up to 20 ns. Maximum dc input voltage on A9, E, and G pins is +12.5 V, which may overshoot to +13.5 V for periods
up to 20 ns.
recommended operating conditions
MIN
3
NOM
3.3
3
MAX
3.6
3.6
70
UNIT
’29LF040 V
CC
range
range
V
Supply voltage
V
CC
’29VF040 V
CC
2.7
0
Commercial (L)
Extended (E)
T
A
Ambient temperature during read/erase/program
°C
−40
85
12
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
electrical dc characteristics over recommended ranges of supply voltage and ambient
temperature
PARAMETER
High-level dc input voltage
Low-level dc input voltage
TEST CONDITIONS
MIN
0.7 * V
MAX
+ 0.3
0.8
UNIT
V
V
V
CMOS
CMOS
V
CC
IH
CC
− 0.5
V
IL
Algorithm-selection and sector-protect/unprotect
input voltage
V
ID
V
CC
= 3.3 V
11.5
12.5
V
†
CMOS
V
V
= V
= V
MIN
I
I
= − 2.0 mA
0.85
V
CC
CC
OH
*
CC
V
V
High-level dc output voltage
V
V
OH
CMOS
MIN
= − 100 µA
V
CC
− 0.4
CC
CC
OH
Low-level dc output voltage
CMOS
V
CC
= V
MIN
I
= 4.0 mA
0.45
OL
CC
OL
(see Note 4)
I
I
I
I
I
Input current (leakage)
Output current (leakage)
High-voltage load current
V
V
V
= V
= V
= V
MAX
MAX
MAX
V =V
SS
to V
CC
1
1
µA
µA
I
CC
CC
CC
CC
I
V =V
O SS
to V
CC
O
CC
A9 = 12.5 V
50
40
60
µA
ID
CC
,
V
CC
V
CC
V
CC
active current (see Note 5)
active current (see Notes 6)
supply current
E = V
G = V
G = V
mA
mA
CC1
CC2
IL
IL
IH
E = V
,
IH
I
CMOS-input level
V
CC
= V
MAX
E = V
0.3 V
100
µA
CC3
CC
CC
(standby)
†
See the recommended operating conditions table.
NOTES: 4. 5.8-mA I also available
OL
current in the read mode, switching at 6 MHz, I
5.
6.
I
I
= 0 mA
OUT
CC
CC
current while erase or program operation is in progress
capacitance over recommended ranges of supply voltage and ambient temperature
PARAMETER
Input capacitance (All inputs except A9, E, G)
Input capacitance (A9, E, G)
TEST CONDITIONS
V = 0 V, f = 1 MHz
MIN
MAX
7.5
9
UNIT
pF
C
C
C
i1
i2
o
I
V = 0 V, f = 1 MHz
I
pF
Output capacitance
V
O
= 0 V, f = 1 MHz
12
pF
13
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
switching characteristics over recommended ranges of supply voltage and ambient temperature,
†
read-only operation (see Figure 2, Figure 11, Figure 13, Figure 15, and Figure 17)
’29LF040-10
’29VF040-10
’29LF040-80
’29LF040-90
ALTERNATE
SYMBOL
PARAMETER
UNIT
MIN MAX
MIN MAX
MIN MAX
t
t
t
t
t
t
t
t
t
Access time, address
t
t
80
90
100
ns
ns
ns
ns
ns
ns
ns
ns
ns
AVQV
ELQV
GLQV
AVAV
a(A)
a(E)
a(G)
Access time, E
80
90
100
Access time, G
t
35
40
45
Cycle time, read
t
80
20
20
0
90
20
20
0
100
30
30
0
c(R)
Disable time, E to high impedance
Disable time, G to high impedance
Hold time, output from address, E or G change
Hold time, G read
t
EHQZ
GHQZ
AXQX
WHGL1
WHGL2
dis(E)
dis(G)
t
t
h(D)
0
0
0
Hold time, G toggle and data polling
10
10
10
’29LF040-12
’29VF040-12
’29LF040-15
’29VF040-15
ALTERNATE
SYMBOL
PARAMETER
UNIT
MIN MAX
MIN MAX
t
t
t
t
t
t
t
t
t
Access time, address
t
t
120
150
ns
ns
ns
ns
ns
ns
ns
ns
ns
AVQV
ELQV
GLQV
AVAV
a(A)
a(E)
a(G)
Access time, E
120
150
Access time, G
t
50
55
Cycle time, read
t
120
30
30
0
150
35
35
0
c(R)
Disable time, E to high impedance
Disable time, G to high impedance
Hold time, output from address, E or G change
Hold time, G read
t
EHQZ
GHQZ
AXQX
WHGL1
WHGL2
dis(E)
t
dis(G)
t
h(D)
0
0
Hold time, G toggle and data polling
10
10
†
See Figure 1 for ac test output load circuit and voltage waveforms.
14
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
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ꢁ
ꢂ
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ꢄ
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ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖ
ꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
timing requirements controlled by W (see Figure 4, Figure 7, Figure 9, Figure 11, Figure 13,
Figure 15, and Figure 17)
’29LF040-10
’29VF040-10
’29LF040-80
’29LF040-90
ALTERNATE
SYMBOL
UNIT
MIN
TYP MAX
MIN
TYP MAX
MIN
TYP MAX
t
t
Cycle time, write
t
80
90
100
ns
AVAV
c(W)
Cycle time, programming
operation
t
20
20
20
µs
WHWH1
c(W)PR
Cycle time, sector-erase
operation
t
2
30
2
30
2
30
s
WHWH2
Cycle time, chip-erase
operation
t
t
t
14
120
14
120
14
120
s
WHWH3
Hold time, address
t
45
0
45
0
45
0
ns
ns
WLAX
h(A)
Hold time, data valid after
W high
t
WHDX
h(D)
t
t
t
Hold time, E
t
0
20
35
0
20
45
0
20
45
ns
ns
ns
WHEH
WHWL
WLWH1
h(E)
Pulse duration, W high
Pulse duration, W low
t
w(WH)
t
w(WL)
Pulse duration, W low
(see Note 7)
t
t
t
100
10
0
100
10
0
100
10
0
µs
ms
ns
WLWH2
WLWH3
GHWL
Pulse duration, W low
(see Note 8)
Recovery time, read
before write
t
rec(R)
t
t
Setup time, address
Setup time, data
t
0
0
0
ns
ns
AVWL
su(A)
t
35
45
45
DVWH
su(D)
Setup time, A0 and A6
low and A1 high to G high
(see Note 7)
t
0
0
0
0
0
0
ns
ns
AVGH
Setup time, A0 low and
A1 high to G and E high
(see Note 8)
t
AVGEH
t
t
t
Setup time, E
Setup time, G
t
0
0
0
0
0
0
ns
ns
µs
ELWL
GHWH
VCEL
su(E)
Setup time, V
CC
50
50
50
Setup time, E V to W
ID
t
t
t
4
4
4
4
4
4
4
4
4
µs
µs
µs
EHVWL
GHVWL
HVT
(see Note 8)
Setup time, G V to W
ID
(see Notes 7 and 8)
Transition time, V (see
ID
Notes 7 and 8)
NOTES: 7. Sector-protect timing (see Figure 15)
8. Sector-unprotect timing (see Figure 17)
15
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
timing requirements controlled by W (see Figure 4, Figure 7, Figure 9, Figure 11, Figure 13,
Figure 15, and Figure 17) (continued)
’29LF040-12
’29VF040-12
’29LF040-15
’29VF040-15
ALTERNATE
SYMBOL
UNIT
MIN
TYP MAX
MIN
TYP MAX
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Cycle time, write
t
120
150
ns
µs
s
AVAV
c(W)
Cycle time, programming operation
Cycle time, sector-erase operation
Cycle time, chip-erase operation
Hold time, address
t
20
20
WHWH1
WHWH2
WHWH3
WLAX
c(W)PR
2
30
2
30
14
120
14
120
s
t
50
0
50
0
ns
ns
ns
ns
ns
µs
ms
ns
ns
ns
h(A)
Hold time, data valid after W high
Hold time, E
t
WHDX
WHEH
WHWL
WLWH1
WLWH2
WLWH3
GHWL
AVWL
h(D)
t
0
0
h(E)
Pulse duration, W high
t
20
50
100
10
0
20
50
100
10
0
w(WH)
Pulse duration, W low
t
w(WL)
Pulse duration, W low (see Note 7)
Pulse duration, W low (see Note 8)
Recovery time, read before write
Setup time, address
t
rec(R)
t
0
0
su(A)
Setup time, data
t
50
50
DVWH
su(D)
Setup time, A0 and A6 low and A1 high to G high
(see Note 7)
t
t
0
0
0
0
ns
ns
AVGH
Setup time, A0 low and A1 high to G and E high
(see Note 8)
AVGEH
t
t
t
t
t
Setup time, E
Setup time, G
t
0
0
0
0
ns
ns
µs
µs
µs
µs
ELWL
su(E)
GHWH
VCEL
Setup time, V
CC
50
4
50
4
Setup time, E V to W (see Note 8)
ID
EHVWL
GHVWL
Setup time, G V to W (see Notes 7 and 8)
ID
4
4
t
Transition time, V (see Notes 7 and 8)
ID
4
4
HVT
NOTES: 7. Sector-protect timing (see Figure 15)
8. Sector-unprotect timing (see Figure 17)
16
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
timing requirements controlled by E (see Figure 5)
’29LF040-10
’29LF040-90
’29LF040-80
ALTERNATE
’29VF040-10
UNIT
SYMBOL
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
t
t
Cycle time, write
t
80
90
100
ns
AVAV
c(W)
Cycle time, programming
operation
20
2
20
2
20
2
µs
EHEH1
Cycle time, sector-erase
operation (see Note 9)
t
t
30
30
30
s
s
EHEH2
EHEH3
Cycle time, chip-erase
operation (see Note 10)
14
120
14
120
14
120
t
t
t
t
t
Hold time, address
Hold time, data
t
45
0
45
0
45
0
ns
ns
ns
ns
ns
ELAX
EHDX
EHWH
ELEH
EHEL
h(A)
h(D)
h(W)
t
Hold time, W
t
0
0
0
Pulse duration, E low
Pulse duration, E high
t
35
20
45
20
45
20
w(EL)
t
w(EH)
rec(R)
Recovery time, read
before write
t
t
0
0
0
ns
GHEL
t
t
t
Setup time, address
Setup time, data
Setup time, W
t
0
35
0
0
45
0
0
45
0
ns
ns
ns
AVE
su(A)
su(D)
su(W)
L
t
DVEH
WLEL
t
’29LF040-12
’29VF040-12
’29LF040-15
’29VF040-15
ALTERNATE
SYMBOL
UNIT
MIN
TYP MAX
MIN
TYP MAX
t
t
t
t
t
t
t
t
t
t
t
t
t
Cycle time, write
t
120
150
ns
µs
s
AVAV
c(W)
Cycle time, programming operation
Cycle time, sector-erase operation (see Note 9)
Cycle time, chip-erase operation (see Note 10)
Hold time, address
20
20
EHEH1
EHEH2
EHEH3
ELAX
2
30
2
30
14
120
14
120
s
t
50
0
50
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
h(A)
h(D)
h(W)
Hold time, data
t
EHDX
EHWH
ELEH
Hold time, W
t
0
0
Pulse duration, E low
t
50
20
0
50
20
0
w(EL)
Pulse duration, E high
t
t
EHEL
w(EH)
Recovery time, read before write
Setup time, address
GHEL
rec(R)
t
0
0
AVE
su(A)
su(D)
su(W)
L
Setup time, data
t
50
0
50
0
DVEH
WLEL
Setup time, W
t
NOTES: 9. Timing diagram of E-controlled sector-erase operation not enclosed.
10. Timing diagram of E-controlled chip-erase operation not enclosed.
17
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
PARAMETER MEASUREMENT INFORMATION
I
OL
0.1 mA
Output
Under
Test
1.50 V
C
= 30 pF
L
(see Note A, Note B, and Note C)
I
− 0.1 mA
OH
3.0 V
0.0 V
1.5 V
1.5 V
NOTES: A.
B. The ac testing inputs are driven at 3 V for logic high and 0 V for logic low. Timing measurements are made at 1.5 V for logic high
and 1.5 V for logic low on both inputs and outputs. Each device should have a 0.1-µF ceramic capacitor connected between V
C includes probe and fixture capacitance.
L
CC
and V
as closely as possible to the device pins.
SS
C. Input rise and fall ≤ 5 ns.
Figure 1. AC Test Output Load Circuit and Voltage Waveforms
18
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
read operation
t
AVAV
Valid Addresses
Addresses
t
AVQV
E
G
t
EHQZ
t
ELQV
t
GHQZ
t
GLQV
W
t
AXQX
t
WHGL1
Valid Data
DQ0−DQ7
Figure 2. AC Waveform for Read Operation
19
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
write operation
Start
Write Bus Cycle
5555H/AAH
Write Bus Cycle
2AAAH/55H
Write Bus Cycle
5555H/A0H
Write Bus Cycle
Program Address/Program Data
Poll Device Status
No
Operation
Complete
?
Yes
Last
Address
?
No
Next Address
Yes
End
Figure 3. Byte-Program Algorithm
20
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
write operation (continued)
t
AVAV
5555H
2AAAH
5555H
PA
PA
Addresses
t
WLAX
t
AVWL
E
t
ELWL
t
WHEH
G
t
WHDX
t
GHWL
t
WHWL
t
WLWH1
W
t
WHWH1
DQ7
t
DVWH
AAH
55H
A0H
PD
DOUT
DQ0−DQ7
NOTES: A. PA = Address of the location to be programmed
B. PD = Data to be programmed
C. DQ7 = Complement of data written to DQ7
Figure 4. AC Waveform for Byte-Program (W-Controlled) Operation
21
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
write operation (continued)
t
AVAV
5555H
2AAAH
5555H
PA
Addresses
PA
t
AVEL
t
ELAX
t
ELEH
E
t
t
EHEL
GHEL
G
t
DVEH
t
EHEH1
t
t
WLEL
EHWH
W
t
EHDX
AAH
55H
A0H
PD
DQ7
DOUT
DQ0−DQ7
NOTES: A. PA
B. PD
=
=
Address of the location to be programmed
Data to be programmed
C. DQ7= Complement of data written to DQ7
Figure 5. AC Waveform for Byte-Program (Alternate E-Controlled) Operation
22
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
chip-erase operation
Start
Write Bus Cycle
5555H/AAH
Write Bus Cycle
2AAAH/55H
Write Bus Cycle
5555H/80H
Write Bus Cycle
5555H/AAH
Write Bus Cycle
2AAAH/55H
Write Bus Cycle
5555H/10H
Poll Device Status
No
Operation
Complete
?
Yes
End
Figure 6. Chip-Erase Algorithm
23
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
chip-erase operation (continued)
t
AVAV
Addresses
5555H
t
2AAAH
5555H
5555H
2AAAH
5555H
VA
AVWL
t
WLAX
E
t
ELWL
t
WHEH
G
t
GHWL
t
WHWL
t
WLWH1
W
t
DVWH
t
WHWH3
t
WHDX
10H
DQ0−DQ7
AAH
55H
80H
AAH
55H
DQ7=0
DOUT=FFH
t
VCEL
V
CC
NOTE A: VA = any valid address
Figure 7. AC Waveform for Chip-Erase Operation
24
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
sector-erase operation
Start
Write Bus Cycle
5555H/AAH
Write Bus Cycle
2AAAH/55H
Write Bus Cycle
5555H/80H
Write Bus Cycle
5555H/AAH
Write Bus Cycle
2AAAH/55H
Write Bus Cycle
Sector Address/30H
No
DQ3 = 0
?
Yes
Load
Additional
Sectors
?
Yes
No
Poll Device Status
Operation
Complete
?
No
Yes
End
Figure 8. Sector-Erase Algorithm
25
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
sector-erase operation (continued)
t
AVAV
5555H
t
Addresses
2AAAH
5555H
5555H
2AAAH
SA
SA
AVWL
t
WLAX
E
t
ELWL
t
WHEH
G
t
GHWL
t
WHWL
t
WLWH1
W
t
DVWH
t
WHWH2
t
WHDX
DQ0−DQ7
AAH
55H
80H
AAH
55H
30H
DQ7=0
DOUT=FFH
t
VCEL
V
CC
NOTE A: SA = Sector address to be erased
Figure 9. AC Waveform for Sector-Erase Operation
26
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
data-polling operation
Start
Read DQ0−DQ7
ADDR = VA
Yes
DQ7 =
Data
?
No
No
DQ5 = 1
?
Yes
Read DQ0−DQ7
ADDR = VA
DQ7 =
Data
?
Yes
No
Fail
Pass
NOTES: A. DQ7 is checked again after DQ5 is checked, even if DQ5 = 1.
B. VA
=
=
=
Program address for byte-programming
Selected sector address for sector erase
Any valid address for chip erase
Figure 10. Data-Polling Algorithm
27
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
data-polling operation (continued)
Addresses
AIN
AIN
AIN
t
AVQV
t
AVQV
t
AXQX
t
ELQV
t
ELQV
E
t
GLQV
t
GLQV
G
t
WHGL2
t
GHQZ
W
t
WHWH1, 2, or 3
DQ7
DQ
DIN
DQ7
DQ7
DOUT
NOTES: A. DIN
B. DQ7
=
=
=
=
Last command data written to the device
Complement of data written to DQ7
Valid data output
C. DOUT
D. AIN
Valid address for byte-program, sector-erase, or chip-erase operation
E. The data-polling operation is valid for both W- and E-controlled byte-program, sector-erase, and chip-erase operations.
Figure 11. AC Waveform for Data-Polling Operation
28
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
toggle-bit operation
Start
Read DQ0−DQ7
ADDR = VA
Read DQ0−DQ7
ADDR = VA
No
DQ6 =
Toggle
?
Yes
No
DQ5 = 1
?
Yes
Read DQ0−DQ7
DQ6 =
Toggle
?
No
Yes
Fail
Pass
NOTE A: DQ6 is checked again after DQ5 is checked, even if DQ5 = 1.
Figure 12. Toggle-Bit Algorithm
29
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
toggle-bit operation (continued)
Addresses
AIN
t
t
AVQV
t
ELQV
GLQV
ELQV
E
t
GLQV
t
G
t
GHWH
t
WHGL2
W
t
WHWH1, 2, OR 3
DQ6 =
Toggle
DQ6 =
Toggle
DQ6 =
Toggle
DQ6 = Stop
Toggle
DIN
DOUT
DQ
NOTES: A. DIN
B. DQ6
=
=
=
=
Last command data written to the device
Toggle bit output
Valid data output
C. DOUT
D. AIN
Valid address for byte-program, sector-erase, or chip-erase operation
E. The toggle-bit operation is valid for both W- and E-controlled byte-program, sector-erase, and chip-erase operations.
Figure 13. AC Waveform for Toggle-Bit Operation
30
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
sector-protect operation
Start
Select Sector Address
A18, A17, A16
X = 1
G and A9 = V
ID
E = V
IL
Apply One 100-µs
Pulse
G, A0, and A6 = V
IL
X = X+1
W and A1 = V
IH
Read Data
No
No
X = 25
?
Data = 01H
?
Yes
Yes
Yes
Sector Protect
Failed
Protect
Additional
Sectors
?
No
A9 = V or V
IH IL
Write Reset Command
End
Figure 14. Sector-Protect Algorithm
31
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
sector-protect operation (continued)
A18−A16
Sector Address
V
ID
A9
t
HVT
A6
A1
A0
t
AVGH
E
V
ID
G
t
WLWH2
t
HVT
t
HVT
t
GHVWL
W
t
GLQV
DOUT
DQ
NOTE A: DOUT
=
=
00H if selected sector is not protected,
01H if the sector is protected
Figure 15. AC Waveform for Sector-Protect Operation
32
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖ
ꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
sector-unprotect operation
Start
Protect All Sectors
X = 1
E, G, A9 = V
A6, A12, A16 = V
ID
IH
Apply One
10-ms Pulse
E, G, A0 = V
IL
W, A6, A1 = V
IH
Select Sector Address
A18, A17, A16
X = X+1
Read Data
No
No
X=1000
?
Next Sector
Address
Data = 00H
?
Yes
Yes
No
Last
Sector
?
Sector-Unprotect Failed
Yes
A9 = V or V
IH IL
Write Reset Command
End
Figure 16. Sector-Unprotect Algorithm
33
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
sector-unprotect operation (continued)
Sector Address
Sector Address
A18–A17
A16
A12
V
ID
A9
t
AVQV
t
HVT
A6
A1
A0
t
AVGEH
V
V
ID
E
t
t
EHVWL
GHVWL
t
t
HVT
HVT
ID
G
t
WLWH3
t
HVT
W
t
GLQV
DOUT
DQ
NOTE A: DOUT
=
=
00H if selected sector is not protected,
01H if the sector is protected
Figure 17. AC Waveform for Sector-Unprotect Operation
34
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
MECHANICAL DATA
FM (R-PQCC-J32)
PLASTIC J-LEADED CHIP CARRIER
Seating Plane
0.004 (0,10)
0.140 (3,56)
0.132 (3,35)
0.495 (12,57)
0.485 (12,32)
0.129 (3,28)
0.123 (3,12)
0.453 (11,51)
0.447 (11,35)
0.049 (1,24)
0.043 (1,09)
0.008 (0,20) NOM
1
30
4
29
5
0.020 (0,51)
0.015 (0,38)
0.595 (15,11)
0.585 (14,86)
0.553 (14,05)
0.547 (13,89)
0.030 (0,76)
TYP
21
13
14
20
0.050 (1,27)
4040201-4/B 03/95
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-016
35
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢈꢇꢉ ꢀ ꢁꢂ ꢃ ꢄ ꢊꢆ ꢇꢈ ꢇ
ꢋꢃ ꢈꢌꢃ ꢍ ꢍ ꢎ ꢏ ꢍ ꢐꢎ ꢑ ꢀ
ꢆ ꢅ ꢒ ꢂꢓ ꢁ ꢔꢁ ꢕꢖ ꢑ ꢔꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
MECHANICAL DATA
DBW (R-PDSO-G32)
PLASTIC THIN SMALL-OUTLINE PACKAGE
1
32
0.020 (0,50)
0.319 (8,10)
0.311 (7,90)
0.011 (0,27)
0.007 (0,17)
0.003 (0,08)
M
17
16
0.492 (12,50)
0.484 (12,30)
0.559 (14,20)
0.543 (13,80)
0.006 (0,15)
NOM
0.047 (1,20) MAX
Seating Plane
0.003 (0,08)
0.028 (0,70)
0.020 (0,50)
0.006 (0,15)
0.002 (0,05)
4073304-2/C 10/97
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
36
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
ꢀ
ꢁꢂ
ꢃ
ꢄ
ꢅꢆ
ꢇ
ꢈ
ꢇ
ꢉ
ꢀ
ꢁ
ꢂ
ꢃ
ꢄ
ꢋ ꢃ ꢈ ꢌ ꢃꢍ ꢍ ꢎ ꢏ ꢍꢐ ꢎ ꢑꢀ
ꢊ
ꢆ
ꢇ
ꢈ
ꢇ
ꢆ
ꢅ
ꢒ
ꢂ
ꢓ
ꢁ
ꢔ
ꢁ
ꢕ
ꢖ
ꢑ
ꢔ
ꢂ
SMJS825D − SEPTEMBER 1995 − REVISED JUNE 1998
MECHANICAL DATA
DD (R-PDSO-G32)
PLASTIC THIN SMALL-OUTLINE PACKAGE
1
32
0.319 (8,10)
0.311 (7,90)
0.020 (0,50)
0.011 (0,27)
0.005 (0,12)
M
0.007 (0,17)
17
16
0.728 (18,50)
0.720 (18,30)
0.028 (0,70)
0.020 (0,50)
0.047 (1,20) MAX
Seating Plane
0.003 (0,08)
0.006 (0,15)
0.002 (0,05)
0.006 (0,15)
NOM
0.795 (20,20)
0.780 (19,80)
4040097/E 10/97
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
37
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
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