25AA640T/P [MICROCHIP]
8K X 8 SPI BUS SERIAL EEPROM, PDIP8, 0.300 INCH, PLASTIC, DIP-8;型号: | 25AA640T/P |
厂家: | MICROCHIP |
描述: | 8K X 8 SPI BUS SERIAL EEPROM, PDIP8, 0.300 INCH, PLASTIC, DIP-8 可编程只读存储器 电动程控只读存储器 电可擦编程只读存储器 光电二极管 |
文件: | 总12页 (文件大小:211K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
25AA640/25LC640
64K SPI Bus Serial EEPROM
M
™
PACKAGE TYPES
DEVICE SELECTION TABLE
Part
Number
VCC
Range
Max Clock
Frequency
Temp
Ranges
PDIP/SOIC
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
CS
SO
25AA640
25LC640
25LC640
1.8-5.5V
2.5-5.5V
4.5-5.5V
1 MHz
2 MHz
C
C,I
3/2.5 MHz
C,I/E
WP
VSS
FEATURES
• Low power CMOS technology
- Write current: 3 mA typical
- Read current: 500 µA typical
- Standby current: 500 nA typical
• 8192 x 8 bit organization
• 32 byte page
• Write cycle time: 5ms max.
• Self-timed ERASE and WRITE cycles
• Block write protection
TSSOP
1
2
3
4
8
7
6
5
SCK
SI
VSS
WP
HOLD
VCC
CS
SO
- Protect none, 1/4, 1/2, or all of array
• Built-in write protection
- Power on/off data protection circuitry
- Write enable latch
BLOCK DIAGRAM
Status
Register
HV Generator
- Write protect pin
• Sequential read
• High reliability
- Data retention: > 200 years
- ESD protection: > 4000 V
• 8-pin PDIP, SOIC, and TSSOP packages
• Temperature ranges supported:
EEPROM
Array
Memory
Control
Logic
X
I/O Control
Logic
- Commercial (C):
- Industrial (I):
0°C to +70°C
-40°C to +85°C
-40°C to +125°C
Dec
- Automotive (E):
Page Latches
DESCRIPTION
SI
The Microchip Technology Inc. 25AA640/25LC640
(25xx640 ) is a 64K bit Serial Electrically Erasable
*
Y Decoder
SO
PROM [EEPROM].The memory is accessed via a sim-
ple Serial Peripheral Interface (SPI) compatible serial
bus. The bus signals required are a clock input (SCK)
plus separate data in (SI) and data out (SO) lines.
Access to the device is controlled through a chip select
(CS) input.
CS
SCK
Sense Amp.
R/W Control
HOLD
WP
VCC
VSS
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused, transi-
tions on its inputs will be ignored, with the exception of
chip select, allowing the host to service higher priority
interrupts.
*25xx640 is used in this document as a generic part number for the 25AA640/25LC640 devices.
SPI is a trademark of Motorola.
1999 Microchip Technology Inc.
Preliminary
DS21223D-page 1
25AA640/25LC640
FIGURE 1-1: AC TEST CIRCUIT
1.0
ELECTRICAL
CHARACTERISTICS
VCC
1.1
Maximum Ratings*
2.25 K
Vcc ...................................................................................7.0V
All inputs and outputs w.r.t. Vss.................. -0.6V to Vcc+1.0V
Storage temperature ....................................... -65˚C to 150˚C
Ambient temperature under bias..................... -65˚C to 125˚C
Soldering temperature of leads (10 seconds) ............. +300˚C
ESD protection on all pins.................................................4kV
SO
1.8 K
100 pF
*Notice: Stresses above those listed under ‘Maximum ratings’ may
cause permanent damage to the device.This is a stress rating only and
functional operation of the device at those or any other conditions
above those indicated in the operational listings of this specification is
not implied. Exposure to maximum rating conditions for an extended
period of time may affect device reliability
1.2
AC Test Conditions
AC Waveform:
VLO = 0.2V
TABLE 1-1:
Name
PIN FUNCTION TABLE
Function
VHI = VCC - 0.2V
VHI = 4.0V
(Note 1)
(Note 2)
CS
SO
Chip Select Input
Serial Data Output
Serial Data Input
Serial Clock Input
Write Protect Pin
Ground
Timing Measurement Reference Level
Input
0.5 VCC
0.5 VCC
SI
Output
SCK
WP
Note 1: For VCC ≤ 4.0V
2: For VCC > 4.0V
VSS
VCC
HOLD
Supply Voltage
Hold Input
TABLE 1-2:
DC CHARACTERISTICS
All parameters apply over the Commercial (C): TAMB = 0°C to +70°C
VCC = 1.8V to 5.5V
specified operating ranges
unless otherwise noted.
Industrial (I):
Automotive (E):
TAMB = -40°C to +85°C
TAMB = -40°C to +125°C
VCC = 2.5V to 5.5V
VCC = 4.5V to 5.5V
Parameter
Symbol
Min
2.0
Max
Units
Test Conditions
VIH1
VCC+1
VCC+1
0.8
V
V
VCC ≥ 2.7V (Note)
High level input voltage
VIH2
VIL1
VIL2
VOL
VOL
VOH
ILI
0.7 VCC
-0.3
-0.3
—
VCC< 2.7V (Note)
V
VCC ≥ 2.7V (Note)
Low level input voltage
Low level output voltage
0.2 VCC
0.4
V
VCC < 2.7V (Note)
V
IOL = 2.1 mA
—
0.2
V
IOL = 1.0 mA, VCC < 2.5V
IOH =-400 µA
High level output voltage
Input leakage current
Output leakage current
VCC -0.5
-10
—
V
10
µA
µA
pF
CS = VCC, VIN = VSS TO VCC
CS = VCC, VOUT = VSS TO VCC
ILO
-10
10
Internal Capacitance
(all inputs and outputs)
CINT
—
7
TAMB = 25˚C, CLK = 1.0 MHz,
VCC = 5.0V (Note)
ICC Read
ICC Write
ICCS
—
—
1
500
mA
µA
VCC = 5.5V; FCLK=3.0 MHz; SO = Open
VCC = 2.5V; FCLK=2.0 MHz; SO = Open
Operating Current
Standby Current
—
—
5
3
mA
mA
VCC= 5.5V
VCC = 2.5V
—
—
5
1
µA
µA
CS = Vcc = 5.5V, Inputs tied to VCC or VSS
CS = Vcc = 2.5V, Inputs tied to VCC or VSS
Note: This parameter is periodically sampled and not 100% tested.
DS21223D-page 2
Preliminary
1999 Microchip Technology Inc.
25AA640/25LC640
TABLE 1-3:
AC CHARACTERISTICS
All parameters apply over the
specified operating ranges unless Industrial (I):
otherwise noted.
Parameter
Commercial (C): TAMB = 0°C to +70°C
TAMB = -40°C to +85°C
TAMB = -40°C to +125°C
VCC = 1.8V to 5.5V
VCC = 2.5V to 5.5V
VCC = 4.5V to 5.5V
Automotive (E):
Symbol
Min
Max
Units
Test Conditions
Clock Frequency
CS Setup Time
CS Hold Time
FCLK
—
—
—
3
2
1
MHz
MHz
MHz
VCC = 4.5V to 5.5V (Note 2)
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
TCSS
TCSH
100
250
500
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
150
250
475
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
CS Disable Time
Data Setup Time
TCSD
TSU
500
—
ns
30
50
50
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
Data Hold Time
THD
50
100
100
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
CLK Rise Time
CLK Fall Time
Clock High Time
TR
TF
—
—
2
2
µs
µs
(Note 1)
(Note 1)
THI
150
250
475
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
Clock Low Time
TLO
150
250
475
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
Clock Delay Time
Clock Enable Time
TCLD
TCLE
TV
50
50
—
—
ns
ns
Output Valid from
Clock Low
—
—
—
150
250
475
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
Output Hold Time
THO
TDIS
0
—
ns
(Note 1)
Output Disable Time
—
—
—
200
250
500
ns
ns
ns
VCC = 4.5V to 5.5V (Note 1)
VCC = 2.5V to 4.5V (Note 1)
VCC = 1.8V to 2.5V (Note 1)
HOLD Setup Time
THS
THH
THZ
THV
100
100
200
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
HOLD Hold Time
100
100
200
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
HOLD Low to Output High-Z
HOLD High to Output Valid
100
150
200
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V (Note 1)
VCC = 2.5V to 4.5V (Note 1)
VCC = 1.8V to 2.5V (Note 1)
100
150
200
—
—
—
ns
ns
ns
VCC = 4.5V to 5.5V
VCC = 2.5V to 4.5V
VCC = 1.8V to 2.5V
Internal Write Cycle Time
Endurance
TWC
—
—
5
ms
100k
—
E/W Cycles (Note 3)
Note 1: This parameter is periodically sampled and not 100% tested.
2: FCLK max. = 2.5 MHz for TAMB > 85°C
3: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific application, please
consult the Total Endurance Model which can be obtained on Microchip’s website.
1999 Microchip Technology Inc.
Preliminary
DS21223D-page 3
25AA640/25LC640
FIGURE 1-2: HOLD TIMING
CS
THH
THS
THS
THH
SCK
SO
THZ
THV
high impedance
don’t care
n
TSU
n
n+2
n+2
n+1
n
n-1
n+1
n
n-1
SI
HOLD
FIGURE 1-3: SERIAL INPUT TIMING
TCSD
CS
TCLE
TCLD
TR
TCSS
TF
TCSH
Mode 1,1
Mode 0,0
Tsu
SCK
SI
THD
MSB in
LSB in
high impedance
SO
FIGURE 1-4: SERIAL OUTPUT TIMING
CS
TCSH
TDIS
THI
TLO
Mode 1,1
Mode 0,0
SCK
TV
THO
MSB out
LSB out
SO
SI
don’t care
DS21223D-page 4
Preliminary
1999 Microchip Technology Inc.
25AA640/25LC640
2.6
Hold (HOLD)
2.0
PIN DESCRIPTIONS
The HOLD pin is used to suspend transmission to the
25xx640 while in the middle of a serial sequence with-
out having to re-transmit the entire sequence over at a
later time. It must be held high any time this function is
not being used. Once the device is selected and a
serial sequence is underway, the HOLD pin may be
pulled low to pause further serial communication with-
out resetting the serial sequence. The HOLD pin must
be brought low while SCK is low, otherwise the HOLD
function will not be invoked until the next SCK high to
low transition. The 25xx640 must remain selected dur-
ing this sequence. The SI, SCK, and SO pins are in a
high impedance state during the time the part is
paused and transitions on these pins will be ignored.
To resume serial communication, HOLD must be
brought high while the SCK pin is low, otherwise serial
communication will not resume. Lowering the HOLD
line at any time will tri-state the SO line.
2.1
Chip Select (CS)
A low level on this pin selects the device. A high level
deselects the device and forces it into standby mode.
However, a programming cycle which is already initi-
ated or in progress will be completed, regardless of
the CS input signal. If CS is brought high during a pro-
gram cycle, the device will go in standby mode as
soon as the programming cycle is complete. As soon
as the device is deselected, SO goes to the high
impedance state, allowing multiple parts to share the
same SPI bus. A low to high transition on CS after a
valid write sequence initiates an internal write cycle.
After power-up, a high to low transition on CS is
required prior to any sequence being initiated.
2.2
Serial Input (SI)
The SI pin is used to transfer data into the device. It
receives instructions, addresses, and data. Data is
latched on the rising edge of the serial clock.
3.0
FUNCTIONAL DESCRIPTION
2.3
Serial Output (SO)
3.1
PRINCIPLES OF OPERATION
The SO pin is used to transfer data out of the 25xx640.
During a read cycle, data is shifted out on this pin after
the falling edge of the serial clock.
The 25xx640 is a 8192 byte Serial EEPROM designed
to interface directly with the Serial Peripheral Interface
(SPI) port of many of today’s popular microcontroller
families, including Microchip’s PIC16C6X/7X micro-
controllers. It may also interface with microcontrollers
that do not have a built-in SPI port by using discrete
I/O lines programmed properly with the software.
2.4
Serial Clock (SCK)
The SCK is used to synchronize the communication
between a master and the 25xx640. Instructions,
addresses, or data present on the SI pin are latched
on the rising edge of the clock input, while data on the
SO pin is updated after the falling edge of the clock
input.
The 25xx640 contains an 8-bit instruction register. The
part is accessed via the SI pin, with data being clocked
in on the rising edge of SCK. The CS pin must be low
and the HOLD pin must be high for the entire opera-
tion.
2.5
Write Protect (WP)
Table 3-1 contains a list of the possible instruction
bytes and format for device operation. All instructions,
addresses, and data are transferred MSB first, LSB
last.
This pin is used in conjunction with the WPEN bit in
the status register to prohibit writes to the non-volatile
bits in the status register. When WP is low and WPEN
is high, writing to the non-volatile bits in the status reg-
ister is disabled. All other operations function nor-
mally. When WP is high, all functions, including writes
to the non-volatile bits in the status register operate
normally. If the WPEN bit is set, WP low during a sta-
tus register write sequence will disable writing to the
status register. If an internal write cycle has already
begun, WP going low will have no effect on the write.
Data is sampled on the first rising edge of SCK after
CS goes low. If the clock line is shared with other
peripheral devices on the SPI bus, the user can assert
the HOLD input and place the 25xx640 in ‘HOLD’
mode. After releasing the HOLD pin, operation will
resume from the point when the HOLD was asserted.
The WP pin function is blocked when the WPEN bit in
the status register is low. This allows the user to install
the 25AA640/25LC640 in a system with WP pin
grounded and still be able to write to the status regis-
ter. The WP pin functions will be enabled when the
WPEN bit is set high.
:PIC is a registered tradmark of Microchip Technology Inc.
1999 Microchip Technology Inc.
Preliminary
DS21223D-page 5
25AA640/25LC640
Once the write enable latch is set, the user may pro-
ceed by setting the CS low, issuing a write instruction,
followed by the address, and then the data to be writ-
ten. Up to 32 bytes of data can be sent to the 25xx640
before a write cycle is necessary. The only restriction
is that all of the bytes must reside in the same page. A
page address begins with XXX0 0000 and ends with
XXX1 1111. If the internal address counter reaches
XXX1 1111 and the clock continues, the counter will
roll back to the first address of the page and overwrite
any data in the page that may have been written.
3.2
Read Sequence
The part is selected by pulling CS low. The 8-bit read
instruction is transmitted to the 25xx640 followed by the
16-bit address with the three MSB’s of the address
being don’t care bits. After the correct read instruction
and address are sent, the data stored in the memory at
the selected address is shifted out on the SO pin. The
data stored in the memory at the next address can be
read sequentially by continuing to provide clock pulses.
The internal address pointer is automatically incre-
mented to the next higher address after each byte of
data is shifted out. When the highest address is
reached (1FFFh), the address counter rolls over to
address 0000h allowing the read cycle to be continued
indefinitely. The read operation is terminated by raising
the CS pin (Figure 3-1).
For the data to be actually written to the array, the CS
must be brought high after the least significant bit (D0)
th
of the n data byte has been clocked in. If CS is
brought high at any other time, the write operation will
not be completed. Refer to Figure 3-2 and Figure 3-3
for more detailed illustrations on the byte write
sequence and the page write sequence respectively.
While the write is in progress, the status register may
be read to check the status of the WPEN, WIP, WEL,
BP1, and BP0 bits (Figure 3-6). A read attempt of a
memory array location will not be possible during a
write cycle. When the write cycle is completed, the
write enable latch is reset.
3.3
Write Sequence
Prior to any attempt to write data to the 25xx640 array
or status register, the write enable latch must be set by
issuing the WREN instruction (Figure 3-4). This is
done by setting CS low and then clocking out the
proper instruction into the 25xx640. After all eight bits
of the instruction are transmitted, the CS must be
brought high to set the write enable latch. If the write
operation is initiated immediately after the WREN
instruction without CS being brought high, the data will
not be written to the array because the write enable
latch will not have been properly set.
TABLE 3-1:
INSTRUCTION SET
Instruction Name
Instruction Format
Description
READ
WRITE
WREN
WRDI
0000 0011
0000 0010
0000 0110
0000 0100
0000 0101
0000 0001
Read data from memory array beginning at selected address
Write data to memory array beginning at selected address
Set the write enable latch (enable write operations)
Reset the write enable latch (disable write operations)
Read status register
RDSR
WRSR
Write status register
FIGURE 3-1: READ SEQUENCE
CS
0
1
2
3
4
5
6
7
8
9
10 11
21 22 23 24 25 26 27 28 29 30 31
SCK
SI
instruction
16 bit address
15 14 13 12
0
0
0
0
0
0
1
1
2
1
0
data out
high impedance
7
6
5
4
3
2
1
0
SO
DS21223D-page 6
Preliminary
1999 Microchip Technology Inc.
25AA640/25LC640
FIGURE 3-2: BYTE WRITE SEQUENCE
CS
Twc
instruction
16 bit address
data byte
0
0
0
0
0
0
1
0
15 14 13 12
2
1
0
7
6
5
4
3
2
1
0
SI
high impedance
SO
FIGURE 3-3: PAGE WRITE SEQUENCE
CS
0
1
2
3
4
5
6
7
8
9
10 11
21 22 23 24 25 26 27 28 29 30 31
SCK
SI
instruction
16 bit address
data byte 1
0
0
0
0
0
0
1
0
15 14 13 12
2
1
0
7
6
5
4
3
2
1
0
CS
32 33 34 35 36 37 38 39
41 42 43 44 45 46 47
data byte 3
40
SCK
SI
data byte 2
data byte n (32 max)
1
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
0
3.4
Write Enable (WREN) and Write
Disable (WRDI)
The following is a list of conditions under which the
write enable latch will be reset:
The 25xx640 contains a write enable latch.
See
• Power-up
Table 3-3 for the Write Protect Functionality Matrix.
This latch must be set before any write operation will
be completed internally. The WREN instruction will set
the latch, and the WRDI will reset the latch.
• WRDI instruction successfully executed
• WRSR instruction successfully executed
FIGURE 3-4: WRITE ENABLE SEQUENCE
CS
0
1
2
3
4
5
6
7
SCK
SI
0
0
0
0
0
1
1
0
high impedance
SO
1999 Microchip Technology Inc.
Preliminary
DS21223D-page 7
25AA640/25LC640
m
FIGURE 3-5: WRITE DISABLE SEQUENCE
CS
0
1
2
3
4
5
6
7
SCK
SI
0
0
0
0
0
1
0
0
high impedance
SO
3.5
Read Status Register (RDSR)
3.6
Write Status Register (WRSR)
The RDSR instruction provides access to the status
register. The status register may be read at any time,
even during a write cycle. The status register is format-
ted as follows:
The WRSR instruction allows the user to select one of
four levels of protection for the array by writing to the
appropriate bits in the status register. The array is
divided up into four segments. The user has the ability
to write protect none, one, two, or all four of the seg-
ments of the array. The partitioning is controlled as
illustrated in Table 3-2.
7
6
5
4
3
2
1
0
WPEN
X
X
X
BP1 BP0 WEL WIP
The Write-In-Process (WIP) bit indicates whether the
25xx640 is busy with a write operation. When set to a
‘1’ a write is in progress, when set to a ‘0’ no write is in
progress. This bit is read only.
The Write Protect Enable (WPEN) bit is a non-volatile
bit that is available as an enable bit for the WP pin.
The Write Protect (WP) pin and the Write Protect
Enable (WPEN) bit in the status register control the
programmable hardware write protect feature. Hard-
ware write protection is enabled when WP pin is low
and the WPEN bit is high. Hardware write protection
is disabled when either the WP pin is high or the
WPEN bit is low. When the chip is hardware write pro-
tected, only writes to non-volatile bits in the status reg-
ister are disabled. See Table 3-3 for a matrix of
functionality on the WPEN bit.
The Write Enable Latch (WEL) bit indicates the sta-
tus of the write enable latch. When set to a ‘1’ the latch
allows writes to the array and status register, when set
to a ‘0’ the latch prohibits writes to the array and status
register.The state of this bit can always be updated via
the WREN or WRDI commands regardless of the state
of write protection on the status register. This bit is
read only.
See Figure 3-7 for WRSR timing sequence
The Block Protection (BP0 and BP1) bits indicate
which blocks are currently write protected. These bits
are set by the user issuing the WRSR instruction.
These bits are non-volatile.
TABLE 3-2:
ARRAY PROTECTION
Array Addresses
Write Protected
BP1
BP0
See Figure 3-6 for RDSR timing sequence
0
0
none
FIGURE 3-6: READ STATUS REGISTER SEQUENCE
CS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
SCK
SI
instruction
0
0
0
0
0
1
0
1
data from status register
high impedance
7
6
5
4
3
2
1
0
SO
DS21223D-page 8
Preliminary
1999 Microchip Technology Inc.
25AA640/25LC640
FIGURE 3-7: WRITE STATUS REGISTER SEQUENCE
CS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
data to status register
SCK
SI
instruction
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
1
high impedance
SO
3.7
Data Protection
3.8
Power On State
The following protection has been implemented to pre-
vent inadvertent writes to the array:
The 25xx640 powers on in the following state:
• The device is in low power standby mode
(CS= 1).
• The write enable latch is reset.
• SO is in high impedance state.
• A high to low transition on CS is required to enter
the active state.
• The write enable latch is reset on power-up.
• A write enable instruction must be issued to set
the write enable latch.
• After a byte write, page write, or status register
write, the write enable latch is reset.
• CS must be set high after the proper number of
clock cycles to start an internal write cycle.
• Access to the array during an internal write cycle
is ignored and programming is continued.
.
TABLE 3-3:
WPEN
WRITE PROTECT FUNCTIONALITY MATRIX
WP
WEL
Protected Blocks
Unprotected Blocks
Status Register
X
0
1
X
X
X
0
1
1
1
Protected
Protected
Protected
Protected
Protected
Writable
Writable
Writable
Protected
Writable
Protected
Writable
Low
High
1999 Microchip Technology Inc.
Preliminary
DS21223D-page 9
25AA640/25LC640
NOTES:
DS21223D-page 10
Preliminary
1999 Microchip Technology Inc.
25AA640/25LC640
25AA640/25LC640 PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
25xx640
—
/P
P = Plastic DIP (300 mil Body), 8-lead
SN = Plastic SOIC (150 mil Body), 8-lead
ST = TSSOP, 8-lead
Package:
Blank = 0°C to +70°C
I = –40°C to +85°C
E = –40°C to +125°C
Temperature
Range:
25AA640
25AA640T
25AA640X
64K bit 1.8V SPI Serial EEPROM
64K bit 1.8V SPI Serial EEPROM Tape and Reel
64K bit 1.8V SPI Serial EEPROM
in alternate pinout (ST only)
25AA640XT
64K bit 1.8V SPI Serial EEPROM
in alternate pinout Tape and Reel (ST only)
64K bit 2.5V SPI Serial EEPROM
64K bit 2.5V SPI Serial EEPROM Tape and Reel
64K bit 2.5V SPI Serial EEPROM
in alternate pinout (ST only)
Devices:
25LC640
25LC640T
25LC640X
25LC640XT
64K bit 2.5V SPI Serial EEPROM
in alternate pinout Tape and Reel (ST only)
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (602) 786-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
DS21223D-page 11
Preliminary
1999 Microchip Technology Inc.
WORLDWIDE SALES AND SERVICE
AMERICAS
AMERICAS (continued)
ASIA/PACIFIC (continued)
Corporate Office
Toronto
Singapore
Microchip Technology Inc.
Microchip Technology Inc.
Microchip Technology Singapore Pte Ltd.
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Tel: 480-786-7200 Fax: 480-786-7277
Technical Support: 480-786-7627
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Taiwan, R.O.C
Microchip Technology Taiwan
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Tung Hua North Road
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ASIA/PACIFIC
Hong Kong
Microchip Asia Pacific
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Atlanta
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Tel: 770-640-0034 Fax: 770-640-0307
Boston
EUROPE
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Tel: 508-480-9990 Fax: 508-480-8575
Beijing
United Kingdom
Microchip Technology, Beijing
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Tel: 630-285-0071 Fax: 630-285-0075
Dallas
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Tel: 91-80-229-0061 Fax: 91-80-229-0062
Tel: 972-818-7423 Fax: 972-818-2924
Dayton
Microchip Technology Inc.
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Tel: 937-291-1654 Fax: 937-291-9175
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Japan
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Parc d’Activite du Moulin de Massy
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Arizona Microchip Technology GmbH
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Korea
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Tel: 82-2-554-7200 Fax: 82-2-558-5934
Shanghai
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Italy
Los Angeles
Arizona Microchip Technology SRL
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Microchip Technology Inc.
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Tel: 949-263-1888 Fax: 949-263-1338
New York
Microchip Technology Inc.
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Tel: 631-273-5305 Fax: 631-273-5335
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
Tel: 86-21-6275-5700 Fax: 86 21-6275-5060
11/15/99
San Jose
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408-436-7950 Fax: 408-436-7955
All rights reserved. © 1999 Microchip Technology Incorporated. Printed in the USA. 11/99
Printed on recycled paper.
Information contained in this publication regarding device applications and the like is intended for suggestion only and may be superseded by updates. No representation or warranty is given and no liability is assumed
by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products
as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. The Microchip
logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights reserved. All other trademarks mentioned herein are the property of their respective companies.
1999 Microchip Technology Inc.
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