25AA640_LC640| Datasheet

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25AA640/25LC640
64K SPITM Bus Serial EEPROM
Device Selection Table
Part Number 25AA640 25LC640 25LC640 VCC Range 1.8-5.5V 2.5-5.5V 4.5-5.5V Max Clock Frequency 1 MHz 2 MHz 3/2.5 MHz Temp Ranges I I I, E

Description
The Microchip Technology Inc. 25AA640/25LC640 (25XX640*) is a 64 Kbit Serial Electrically Erasable PROM [EEPROM]. 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.

Features
Low-power CMOS technology - Write current: 3 mA typical - Read current: 500 uA typical - Standby current: 500 nA typical 8192 x 8 bit organization 32 byte page Write cycle time: 5 ms max. Self-timed erase and write cycles 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 - Data retention: > 200 years - ESD protection: > 4000V 8-pin PDIP, SOIC and TSSOP packages Temperature ranges supported: - Industrial (I): -40 C to +85 C - Automotive (E): -40 C to +125 C

Block Diagram
Status Register HV Generator

EEPROM I/O Control Logic Memory Control Logic XDEC Array

Page Latches

SI SO CS SCK HOLD WP VCC VSS Sense Amp. R/W Control Y Decoder

Package Types
PDIP/SOIC CS SO WP VSS 1 25XX640 2 3 4 8 7 6 5 VCC HOLD SCK SI HOLD VCC CS SO 1 2 3 4 TSSOP 8 7 6 5 SCK SI VSS WP 25XX640

*25XX640 is used in this document as a generic part number for the 25AA640/25LC640 devices. SPI is a registered trademark of Motorola Corporation.

2004 Microchip Technology Inc.

DS21223G-page 1

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25AA640_LC640 DATASHEET