25AA640A_25LC640A| Datasheet

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25AA640A/25LC640A
64K SPI Bus Serial EEPROM
Device Selection Table
Part Number 25LC640A 25AA640A VCC Range 2.5-5.5V 1.8-5.5V Page Size 32 Byte 32 Byte Temp. Ranges I,E I Packages P, SN, ST, MS, MF P, SN, ST, MS, MF

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: 1 A at 5.5V 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; - Industrial (I): -40 C to +85 C - Automotive (E): -40 C to +125 C

Description:
The Microchip Technology Inc. 25AA640A/25LC640A (25XX640A*) are 64k-bit Serial Electrically Erasable PROMs. 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, transitions on its inputs will be ignored, with the exception of Chip Select, allowing the host to service higher priority interrupts. The 25XX640A is available in standard packages including 8-lead PDIP and SOIC, and advanced packaging including 8-lead MSOP, 8-lead TSSOP and DFN.

Package Types (not to scale)
TSSOP/MSOP
(ST, MS)
CS SO WP VSS 1 2 3 4 8 7 6 5 VCC HOLD SCK SI

PDIP/SOIC
(P, SN)
CS SO WP VSS 1 2 3 4 8 7 6 5 VCC HOLD SCK SI

Pin Function Table
Name CS SO WP VSS SI SCK HOLD VCC Function Chip Select Input Serial Data Output Write-Protect Ground Serial Data Input Serial Clock Input Hold Input Supply Voltage X-Rotated TSSOP
(X/ST)

DFN
(MF)
CS 1 8 7 6 5 VCC HOLD SCK SI

HOLD VCC CS SO

1 2 3 4

8 7 6 5

SCK SI VSS WP

SO 2 WP 3 VSS 4

* 25XX640A is used in this document as a generic part number for the 25AA640A, 25LC640A devices.

2007 Microchip Technology Inc.

DS21830C-page 1

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25AA640A_25LC640A DATASHEET