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25AA640T-I/ST Datasheet

  • 25AA640T-I/ST

  • SPI Serial EEPROM

  • 331.35KB

  • 24頁

  • ETC

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M
Device Selection Table
Part
Number
25AA640
25LC640
25LC640
V
CC
Range
1.8-5.5V
2.5-5.5V
4.5-5.5V
25AA640/25LC640
Description
Temp
Ranges
I
I
I, E
The Microchip Technology Inc. 25AA640/25LC640
(25XX640
*
) is a 64K bit Serial Electrically Erasable
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.
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.
64K SPI鈩?Bus Serial EEPROM
Max Clock
Frequency
1 MHz
2 MHz
3/2.5 MHz
Features
鈥?Low power CMOS technology
- Write current: 3 mA typical
- Read current: 500
碌
A typical
- Standby current: 500 nA typical
鈥?8192 x 8 bit organization
鈥?32 byte page
鈥?Write cycle time: 5 ms max.
鈥?Self-timed ERASE and WRITE cycles
鈥?Block write protection
- Protect none, 1/4, 1/2 or all of array
鈥?Built-in write protection
- Power on/off data protection circuitry
- Write enable latch
- Write protect pin
鈥?Sequential read
鈥?High reliability
- Data retention: > 200 years
- ESD protection: > 4000V
鈥?8-pin PDIP, SOIC and TSSOP packages
鈥?Temperature ranges supported:
- Industrial (I): -40擄C to +85擄C
- Automotive (E): -40擄C to +125擄C
Block Diagram
Status
Register
HV Generator
EEPROM
I/O Control
Logic
Memory
Control
Logic
X
Array
Dec
Page Latches
SI
SO
CS
SCK
HOLD
WP
V
CC
V
SS
Sense Amp.
R/W Control
Y Decoder
Package Types
PDIP/SOIC
CS
SO
WP
V
SS
1
25XX640
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
HOLD
V
CC
CS
SO
1
2
3
4
TSSOP
8
7
6
5
SCK
SI
V
SS
WP
25XX640
*25XX640 is used in this document as a generic part number for the 25AA640/25LC640 devices.
錚?/div>
2001 Microchip Technology Inc.
DS21223E-page 1

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