25LC640A Datasheet, PDF (1/24 Pages) Microchip Technology – 64K SPI Bus Serial EEPROM Extended (M) Operating Temperatures

25LC640A
64K SPI Bus Serial EEPROM
Extended (M) Operating Temperatures
Device Selection Table
Part Number
25LC640A
VCC Range
2.5-5.5V
Page Size
32 Byte
Temp. Ranges
M
Packages
SN
Features:
• Max. Clock 10 MHz
• Low-Power CMOS Technology
- Max. Write Current: 5 mA at 5.5V, 10 MHz
- Read Current: 5 mA at 5.5V, 10 MHz
- Standby Current: 5 μA at 5.5V, 125°C
• 8192 x 8-bit Organization
• 32 Byte Page
• Self-Timed Erase and Write Cycles (5 ms max.)
• Block Write Protection
- Protect none, 1/4, 1/2 or all of array
• Built-In Write Protection
- Power-on/off data protection circuitry
- Write enable latch
- Write-protect pin
• Sequential Read
• High Reliability
- Endurance: 1,000,000 erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
• Temperature Ranges Supported:
- Extended (M): -55°C to 125°C
Description:
The Microchip Technology Inc. 25LC640A is a 64 kbit
Serial Electrically Erasable PROM. The memory is
accessed via a simple 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.
The 25LC640A is available in 8-lead SOIC.
Package Types (not to scale)
SOIC
(SN)
CS 1
SO 2
WP 3
VSS 4
8 VCC
7 HOLD
6 SCK
5 SI
© 2009 Microchip Technology Inc.
DS22144A-page 1