M87C257-80C3 [STMICROELECTRONICS]
32KX8 OTPROM, 80ns, PQCC32, LEAD FREE, PLASTIC, LCC-32;
| 型号： | M87C257-80C3 |
| 厂家： | 
ST |
| 描述： | 32KX8 OTPROM, 80ns, PQCC32, LEAD FREE, PLASTIC, LCC-32 可编程只读存储器 |
| 文件： | 总22页 (文件大小：196K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M87C257
Address Latched
256 Kbit (32Kb x8) UV EPROM and OTP EPROM
Feature summary
■ 5V ± 10% supply voltage in Read operation
■ Integrated address latch
■ Access time: 45ns
28
■ Low power consumption:
– Active Current 30mA
– Standby Current 100µA
1
FDIP28W (F)
■ Programming voltage: 12.75V ± 0.25V
■ Programming times of around 3s
■ Electronic signature
– Manufacturer Code: 20h
– Device Code: 80h
■ ECOPACK® packages available
PLCC32 (C)
May 2006
Rev 2
1/9
www.st.com
1
Contents
M87C257
Contents
1
2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
Read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Two Line Output Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
System considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
PRESTO II programming algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Program Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Program Verify . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electronic signature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.10 Erasure operation (applies for UV EPROM) . . . . . . . . . . . . . . . . . . . . . . . 10
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3
4
5
6
7
2/22
M87C257
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electronic signature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
AC measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Read mode DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Programming mode DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Read mode AC characteristics 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Read mode AC characteristics 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Programming mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FDIP28WB - 28 pin Ceramic Frit-seal DIP, with window (round 0.280"),
package mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PLCC32 - 32 pin Rectangular Plastic Leaded Chip Carrier,
Table 13.
package mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 14.
Table 15.
3/22
List of figures
M87C257
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DIP connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LCC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Programming flowchart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
AC testing input output waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
AC testing load circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Read mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Programming and Verify modes AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FDIP28W - 28 pin Ceramic Frit-seal DIP, with window, package outline . . . . . . . . . . . . . . 18
Figure 10. PLCC32 - 32 pin Rectangular Plastic Leaded Chip Carrier, package outline. . . . . . . . . . . 19
4/22
M87C257
Description
1
Description
The M87C257 is a 256 Kbit EPROM offered in the two ranges UV (ultra violet erase) and
OTP (one time programmable). It incorporates latches for all address inputs to minimize chip
count, reduce cost, and simplify the design of multiplexed bus systems and is organized as
32,768 by 8 bits.
The FDIP28W (window ceramic frit-seal package) has a transparent lid which allows the
user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be
written to the device by following the programming procedure.
For applications where the content is programmed only one time and erasure is not
required, the M87C257 is offered in PLCC32 package.
In order to meet environmental requirements, ST offers the M87C257 in ECOPACK®
packages.
ECOPACK packages are Lead-free. The category of second Level Interconnect is marked
on the package and on the inner box label, in compliance with JEDEC Standard JESD97.
The maximum ratings related to soldering conditions are also marked on the inner box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 1.
Logic diagram
V
CC
15
8
A0-A14
Q0-Q7
E
M87C257
G
ASV
PP
V
SS
AI00928B
5/22
Description
M87C257
Table 1.
Signal names
A0-A14
Address Inputs
Data Outputs
Q0-Q7
E
Chip Enable
G
Output Enable
ASVPP
VCC
VSS
NC
Address Strobe / Program Supply
Supply Voltage
Ground
Not Connected Internally
Don’t Use
DU
Figure 2.
DIP connections
ASV
1
2
3
4
5
6
7
8
9
28
V
CC
PP
A12
A7
A6
A5
A4
A3
A2
A1
27 A14
26 A13
25 A8
24 A9
23 A11
22
G
M87C257
21 A10
20
E
A0 10
Q0 11
Q1 12
Q2 13
19 Q7
18 Q6
17 Q5
16 Q4
15 Q3
V
14
SS
AI00929
Figure 3.
LCC connections
1 32
M87C257
17
A6
A5
A4
A3
A2
A1
A0
NC
Q0
A8
A9
A11
NC
G
9
25
A10
E
Q7
Q6
AI00930
6/22
M87C257
Device operation
2
Device operation
The modes of operation of the M87C257 are listed in the Operating Modes. A single power
supply is required in the read mode. All inputs are TTL levels except for V and 12V on A9
PP
for Electronic Signature.
2.1
Read mode
The M87C257 has two control functions, both of which must be logically active in order to
obtain data at the outputs. Chip Enable (E) is the power control and should be used for
device selection. Output Enable (G) is the output control and should be used to gate data to
the output pins, independent of device selection. Assuming that the addresses are stable
(AS = V ) or latched (AS = V ), the address access time (t
) is equal to the delay from
IH
IL
AVQV
E to output (t
). Data is available at the output after delay of t
from the falling edge
ELQV
GLQV
of G, assuming that E has been low and the addresses have been stable for at least t
-
AVQV
t
.The M87C257 reduces the hardware interface in multiplexed address-data bus
GLQV
systems. The processor multiplexed bus (AD0-AD7) may be tied to the M87C257's address
and data pins. No separate address latch is needed because the M87C257 latches all
address inputs when AS is low.
2.2
2.3
Standby mode
The M87C257 has a standby mode which reduces the active current from 30mA to 100µA
(Address Stable). The M87C257 is placed in the standby mode by applying a CMOS high
signal to the E input. When in the standby mode, the outputs are in a high impedance state,
independent of the G input.
Two Line Output Control
Because EPROMs are usually used in larger memory arrays, this product features a 2 line
control function which accommodates the use of multiple memory connection. The two line
control function allows:
■
■
the lowest possible memory power dissipation,
complete assurance that output bus contention will not occur.
For the most efficient use of these two control lines, E should be decoded and used as the
primary device selecting function, while G should be made a common connection to all
devices in the array and connected to the READ line from the system control bus. This
ensures that all deselected memory devices are in their low power standby mode and that
the output pins are only active when data is desired from a particular memory device.
7/22
Device operation
M87C257
2.4
System considerations
The power switching characteristics of Advance CMOS EPROMs require careful decoupling
of the devices. The supply current, I , has three segments that are of interest to the system
CC
designer: the standby current level, the active current level, and transient current peaks that
are produced by the falling and rising edges of E. The magnitude of this transient current
peaks is dependent on the capacitive and inductive loading of the device at the output. The
associated transient voltage peaks can be suppressed by complying with the two line output
control and by properly selected decoupling capacitors. It is recommended that a 0.1µF
ceramic capacitor be used on every device between V and V . This should be a high
CC
SS
frequency capacitor of low inherent inductance and should be placed as close to the device
as possible. In addition, a 4.7µF bulk electrolytic capacitor should be used between V and
CC
V
for every eight devices. The bulk capacitor should be located near the power supply
SS
connection point. The purpose of the bulk capacitor is to overcome the voltage drop caused
by the inductive effects of PCB traces.
2.5
Programming
When delivered (and after each erasure for UV EPROM), all bits of the M87C257 are in the
'1' state. Data is introduced by selectively programming '0's into the desired bit locations.
Although only '0's will be programmed, both '1's and '0's can be present in the data word.
The only way to change a '0' to a '1' is by die exposition to ultraviolet light (UV EPROM). The
M87C257 is in the programming mode when V input is at 12.75V, G is at V and E is
PP
IH
pulsed to V . The data to be programmed is applied to 8 bits in parallel to the data output
IL
pins. The levels required for the address and data inputs are TTL. V is specified to be
CC
6.25 V ± 0.25 V.
2.6
PRESTO II programming algorithm
PRESTO II Programming Algorithm allows to program the whole array with a guaranteed
margin, in a typical time of 3.5 seconds. Programming with PRESTO II involves the
application of a sequence of 100µs program pulses to each byte until a correct verify occurs
(see Figure 4). During programming and verify operation, a MARGIN MODE circuit is
automatically activated in order to guarantee that each cell is programmed with enough
margin. No overprogram pulse is applied since the verify in MARGIN MODE provides
necessary margin to each programmed cell.
8/22
M87C257
Device operation
Figure 4.
Programming flowchart
V
= 6.25V, V = 12.75V
PP
CC
n = 0
E = 100µs Pulse
NO
NO
++n
VERIFY
YES
++ Addr
= 25
YES
Last
Addr
NO
FAIL
YES
CHECK ALL BYTES
1st: V
2nd: V
= 6V
= 4.2V
CC
CC
AI00760B
2.7
2.8
Program Inhibit
Programming of multiple M87C257s in parallel with different data is also easily
accomplished. Except for E, all like inputs including G of the parallel M87C257 may be
common. A TTL low level pulse applied to a M87C257's E input, with V at 12.75V, will
program that M87C257. A high level E input inhibits the other M87C257s from being
programmed.
PP
Program Verify
A verify (read) should be performed on the programmed bits to determine that they were
correctly programmed. The verify is accomplished with G at V , E at V , V at 12.75V and
IL
IH PP
V
at 6.25V.
CC
9/22
Device operation
M87C257
2.9
Electronic signature
The Electronic Signature (ES) mode allows the reading out of a binary code from an
EPROM that will identify its manufacturer and type. This mode is intended for use by
programming equipment to automatically match the device to be programmed with its
corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C
ambient temperature range that is required when programming the M87C257.
To activate the ES mode, the programming equipment must force 11.5V to 12.5V on
address line A9 of the M87C257, with V = V = 5V. Two identifier bytes may then be
CC
PP
sequenced from the device outputs by toggling address line A0 from V to V . All other
IL
IH
address lines must be held at V during Electronic Signature mode. Byte 0 (A0 = V )
IL
IL
represents the manufacturer code and byte 1 (A0 = V ) the device identifier code. When A9
IH
= V , AS need not be toggled to latch each identifier address. For the STMicroelectronics
ID
M87C257, these two identifier bytes are given in Table 4 and can be read-out on outputs Q7
to Q0.
2.10
Erasure operation (applies for UV EPROM)
The erasure characteristics of the M87C257 is such that erasure begins when the cells are
exposed to light with wavelengths shorter than approximately 4000 Å. It should be noted
that sunlight and some type of fluorescent lamps have wavelengths in the 3000-4000 Å
range. Research shows that constant exposure to room level fluorescent lighting could
erase a typical M87C257 in about 3 years, while it would take approximately 1 week to
cause erasure when exposed to direct sunlight. If the M87C257 is to be exposed to these
types of lighting conditions for extended periods of time, it is suggested that opaque labels
be put over the M87C257 window to prevent unintentional erasure. The recommended
erasure procedure for the M87C257 is exposure to short wave ultraviolet light which has
wavelength 2537Å. The integrated dose (i.e. UV intensity x exposure time) for erasure
2
should be a minimum of 15 W-sec/cm . The erasure time with this dosage is approximately
2
15 to 20 minutes using an ultraviolet lamp with 12000 µW/cm power rating. The M87C257
should be placed within 2.5 cm (1 inch) of the lamp tubes during the erasure. Some lamps
have a filter on their tubes which should be removed before erasure.
10/22
M87C257
Maximum rating
3
Maximum rating
Stressing the device above the rating listed in the Absolute Maximum Ratings table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the Operating sections of
this specification is not implied. Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability. Refer also to the STMicroelectronics SURE
Program and other relevant quality documents.
Table 2.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
TA
Ambient Operating Temperature(1)
Temperature Under Bias
Storage Temperature
–40 to 125
–50 to 125
–65 to 150
–2 to 7
°C
°C
°C
V
TBIAS
TSTG
(2)
VIO
Input or Output Voltage (except A9)
Supply Voltage
VCC
–2 to 7
V
(2)
VA9
A9 Voltage
–2 to 13.5
–2 to 14
V
VPP
Program Supply Voltage
V
1. Depends on range.
2. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0V for a period less than
20ns. Maximum DC voltage on Output is VCC +0.5V with possible overshoot to VCC +2V for a period less
than 20ns.
Table 3.
Operating modes
Mode
E
G
A9
ASVPP
Q7-Q0
Read (Latched Address)
Read (Applied Address)
Output Disable
Program
VIL
VIL
VIL
VIL
VIH
VIH
VIL
VIH
X
X
X
VIL
VIH
X
Data Out
Data Out
Hi-Z
VIL
X
VIL Pulse
VIH
X
VPP
VPP
VPP
X
Data In
Data Out
Hi-Z
Verify
X
Program Inhibit
Standby
VIH
X
VIH
X
Hi-Z
Electronic Signature
VIL
VIL
VID
VIL
Codes
1. X = VIH or VIL, VID = 12V ± 0.5V.
Table 4.
Electronic signature
Identifier
A0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Hex Data
Manufacturer’s Code
Device Code
VIL
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
20h
80h
VIH
11/22
DC and AC parameters
M87C257
4
DC and AC parameters
This section summarizes the operating and measurement conditions, and the DC and AC
characteristics of the device. The parameters in the DC and AC Characteristic tables that
follow are derived from tests performed under the Measurement Conditions summarized in
the relevant tables. Designers should check that the operating conditions in their circuit
match the measurement conditions when relying on the quoted parameters.
Table 5.
AC measurement conditions
High Speed
Standard
Input Rise and Fall Times
≤10ns
0 to 3V
1.5V
≤20ns
Input Pulse Voltages
0.4V to 2.4V
0.8V and 2V
Input and Output Timing Ref. Voltages
Figure 5.
AC testing input output waveform
High Speed
3V
1.5V
0V
Standard
2.4V
2.0V
0.8V
0.4V
AI01822
Figure 6.
AC testing load circuit
1.3V
1N914
3.3kΩ
DEVICE
UNDER
TEST
OUT
C
L
C
C
C
= 30pF for High Speed
= 100pF for Standard
includes JIG capacitance
L
L
L
AI01823B
12/22
M87C257
DC and AC parameters
(1) (2)
Table 6.
Symbol
Capacitance
Parameter
Input Capacitance
Output Capacitance
Test Condition
Min
Max
Unit
CIN
VIN = 0V
6
pF
pF
COUT
VOUT = 0V
12
1.
TA = 25 °C, f = 1 MHz
2. Sampled only, not 100% tested.
(1) (2)
Table 7.
Symbol
Read mode DC characteristics
Parameter
Test Condition
Min
Max
Unit
ILI
Input Leakage Current
Output Leakage Current
0V ≤VIN ≤VCC
±10
±10
µA
µA
ILO
0V ≤VOUT ≤VCC
E = VIL, G = VIL,
IOUT = 0mA, f = 5MHz
ICC
Supply Current
30
10
1
mA
mA
mA
mA
µA
E = VIH, ASVPP = VIH, Address
Switching
Supply Current
(Standby) TTL
ICC1
E = VIH, ASVPP = VIL, Address
Stable
E > VCC – 0.2V, ASVPP ≥ VCC
–
6
0.2V, Address Switching
Supply Current
(Standby) CMOS
ICC2
E > VCC – 0.2V, ASVPP = VSS
,
100
Address Stable
IPP
VIL
Program Current
VPP = VCC
100
0.8
µA
V
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
–0.3
2
(3)
VIH
VCC + 1
0.4
V
VOL
VOH
IOL = 2.1mA
IOH = –1mA
V
VCC – 0.8V
V
1. TA = 0 to 70 °C, –40 to 85 °C; –40 to 105 °C or –40 to 125 °C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC
2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP
3. Maximum DC voltage on Output is VCC +0.5V.
.
(1) (2)
Table 8.
Symbol
Programming mode DC characteristics
Parameter
Test Condition
Min
Max
Unit
ILI
ICC
IPP
Input Leakage Current
Supply Current
V
IL ≤VIN ≤VIH
±10
50
µA
mA
mA
V
Program Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage TTL
A9 Voltage
E = VIL
50
VIL
–0.3
2
0.8
VIH
VOL
VOH
VID
VCC + 0.5
0.4
V
IOL = 2.1mA
IOH = –1mA
V
VCC – 0.8
11.5
V
12.5
V
1. TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V
2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP
.
13/22
DC and AC parameters
Figure 7.
M87C257
Read mode AC waveforms
A0-A14
VALID
tASLAX
tAXQX
tAVASL
ASV
PP
tASHASL
tASLGL
tAVQV
E
tGLQV
tEHQZ
G
tELQV
tGHQZ
Hi-Z
Q0-Q7
DATA OUT
AI00931
14/22
M87C257
DC and AC parameters
(1) (2)
Table 9.
Read mode AC characteristics 1
M87C257
-60 -70
Min Max Min Max Min Max Min Max
Test
Parameter
Symbol Alt
-45(3)
-80
Unit
Condition
Address Valid to
Output Valid
E = VIL,
G = VIL
tAVQV tACC
tAVASL tAL
tASHASL tLL
tASLAX tLA
tASLGL tLOE
tELQV tCE
45
60
70
80
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Address Valid to
Address Strobe Low
7
7
7
7
Address Strobe High
to Address Strobe Low
35
20
20
45
25
25
25
35 35
20 20
20 20
60
35
20
20
Address Strobe Low to
Address Transition
Address Strobe Low to
Output Enable Low
Chip Enable Low to
Output Valid
G = VIL
E = VIL
G = VIL
E = VIL
70
35
30
30
80
40
40
40
Output Enable Low to
Output Valid
tGLQV tOE
30
Chip Enable High to
Output Hi-Z
(4)
tEHQZ
tDF
0
0
0
0
0
0
30
30
0
0
0
0
0
0
Output Enable High to
Output Hi-Z
(4)
tGHQZ
tDF
Address Transition to
Output Transition
E = VIL,
G = VIL
tAXQX tOH
1.
TA = 0 to 70 °C, –40 to 85 °C; –40 to 105 °C or –40 to 125 °C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC
2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP
3. Speed obtained with High Speed AC measurement conditions.
4. Sampled only, not 100% tested.
.
15/22
DC and AC parameters
M87C257
(1) (2)
-90
Table 10. Read mode AC characteristics 2
M87C257
-10 -12
Test
Symbol Alt
Parameter
-15/-20 Unit
Condition
Min Max Min Max Min Max Min Max
Address Valid to
Output Valid
E = VIL,
G = VIL
tAVQV tACC
90
100
120
150 ns
ns
Address Valid to
Address Strobe Low
tAVASL
tAL
7
7
7
7
Address Strobe
tASHASL tLL High to Address
Strobe Low
35
35
35
35
ns
ns
Address Strobe Low
tASLAX
tLA to Address
Transition
20
20
20
20
20
20
20
20
Address Strobe Low
tASLGL tLOE to Output Enable
Low
ns
Chip Enable Low to
Output Valid
tELQV
tGLQV
tCE
tOE
tDF
tDF
tOH
G = VIL
E = VIL
G = VIL
90
40
40
40
100
40
120
50
150 ns
Output Enable Low
to Output Valid
60
40
40
ns
ns
ns
ns
Chip Enable High to
Output Hi-Z
(3)
tEHQZ
0
0
0
0
0
0
30
0
0
0
40
0
0
0
Output Enable High
to Output Hi-Z
(3)
tGHQZ
tAXQX
E = VIL
E = VIL,
30
40
Address Transition
to Output Transition G = VIL
1. TA = 0 to 70 °C, –40 to 85 °C; –40 to 105 °C or –40 to 125 °C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC
2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP
3. Sampled only, not 100% tested.
.
16/22
M87C257
DC and AC parameters
Figure 8.
Programming and Verify modes AC waveforms
VALID
A0-A14
tAVEL
DATA IN
tQVEL
Q0-Q7
ASV
DATA OUT
tEHQX
PP
tVPHEL
tVCHEL
tGLQV
tGHQZ
tGHAX
V
CC
E
tELEH
tQXGL
G
PROGRAM
VERIFY
AI00557
(1) (2)
Table 11. Programming mode AC characteristics
Test
Condition
Symbol
Alt
Parameter
Min
Max Unit
tAVEL
tQVEL
tVPHEL
tVCHEL
tELEH
tEHQX
tQXGL
tGLQV
tGHQZ
tAS Address Valid to Chip Enable Low
tDS Input Valid to Chip Enable Low
tVPS VPP High to Chip Enable Low
2
2
µs
µs
µs
µs
2
tVCS VCC High to Chip Enable Low
tPW Chip Enable Program Pulse Width
tDH Chip Enable High to Input Transition
tOES Input Transition to Output Enable Low
tOE Output Enable Low to Output Valid
tDFP Output Enable High to Output Hi-Z
2
95
2
105
µs
µs
µs
ns
ns
2
100
130
0
0
Output Enable High to Address
Transition
tGHAX
tAH
ns
1. TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V
2. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP
.
17/22
Package mechanical
M87C257
5
Package mechanical
Figure 9.
FDIP28W - 28 pin Ceramic Frit-seal DIP, with window, package outline
A2
A3
A1
A
L
α
B1
B
e
C
eA
eB
D2
D
S
N
1
E1
E
FDIPW-a
1. Drawing is not to scale.
Table 12. FDIP28WB - 28 pin Ceramic Frit-seal DIP, with window (round 0.280"),
package mechanical data
millimeters
Min
inches
Min
Symbol
Typ
Max
Typ
Max
A
A1
A2
A3
B
5.72
1.40
4.57
4.50
0.56
–
0.225
0.055
0.180
0.177
0.022
–
0.51
3.91
3.89
0.41
–
0.020
0.154
0.153
0.016
–
B1
C
1.45
0.057
0.23
36.50
–
0.30
37.34
–
0.009
1.437
–
0.012
1.470
–
D
D2
E
33.02
15.24
1.300
0.600
–
–
–
–
E1
e
13.06
–
13.36
–
0.514
–
0.526
–
2.54
0.100
0.590
eA
eB
L
14.99
–
–
–
–
16.18
3.18
4°
18.03
4.10
11°
2.49
–
0.637
0.125
4°
0.710
0.161
11°
α
S
1.52
–
0.060
–
0.098
–
Ø
7.11
0.280
N
28
28
18/22
M87C257
Package mechanical
Figure 10. PLCC32 - 32 pin Rectangular Plastic Leaded Chip Carrier, package
outline
D
A1
A2
D1
1
N
B1
e
E2
E2
E3
E1 E
F
B
0.51 (.020)
1.14 (.045)
D3
A
R
CP
D2
D2
PLCC-A
1. Drawing is not to scale.
Table 13. PLCC32 - 32 pin Rectangular Plastic Leaded Chip Carrier,
package mechanical data
millimeters
Min
inches
Symbol
Typ
Max
Typ
Min
Max
A
A1
A2
B
3.18
1.53
0.38
0.33
0.66
3.56
2.41
–
0.125
0.060
0.015
0.013
0.026
0.140
0.095
–
0.53
0.81
0.10
12.57
11.51
5.66
–
0.021
0.032
0.004
0.495
0.453
0.223
–
B1
CP
D
12.32
11.35
4.78
–
0.485
0.447
0.188
–
D1
D2
D3
E
7.62
0.300
14.86
13.89
6.05
–
15.11
14.05
6.93
–
0.585
0.547
0.238
–
0.595
0.553
0.273
–
E1
E2
E3
e
10.16
1.27
0.400
0.050
–
–
–
–
F
0.00
–
0.13
–
0.000
–
0.005
–
R
0.89
0.035
N
32
32
19/22
Part numbering
M87C257
6
Part numbering
Table 14. Ordering information scheme
Example:
M87C257
-70
X
C
1
X
Device Type
M87
Supply Voltage
C = 5V
Device Function
257 = 256 Kbit (32Kb x 8)
Speed
-45(1) = 45 ns
-60 = 60ns
-70 = 70 ns
-80 = 80 ns
-90 = 90 ns
-10 = 100 ns
-12 = 120 ns
-15 = 150 ns
-20 = 200 ns
VCC Tolerance
X = ± 5%
blank = ± 10%
Package
F = FDIP28W
C = PLCC32
Temperature Range
1 = 0 to 70 °C
3 = –40 to 125 °C
6 = –40 to 85 °C
Options
TR = Tape & Reel Packing
1. High Speed, see AC Characteristics section for further information.
For a list of available options (Speed, Package, etc...) or for further information on any
aspect of this device, please contact the STMicroelectronics Sales Office nearest to you.
20/22
M87C257
Revision history
7
Revision history
Table 15. Document revision history
Date
Revision
Changes
01-Jun-1996
1
Initial release.
Document converted to new template (sections added, information
moved).
23-May-2006
2
Packages are ECOPACK® compliant. Package specifications
updated (see Section 5: Package mechanical).
X option removed from Table 15: Document revision history.
21/22
M87C257
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22/22
相关型号：
M87C257-80F1
32KX8 UVPROM, 80ns, CDIP28, LEAD FREE, CERAMIC, WINDOWED, FRIT SEALED, DIP-28
STMICROELECTR
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