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25AA640

MicrochipTechnology
Part Number 25AA640
Manufacturer MicrochipTechnology
Description 64K SPI Bus Serial EEPROM
Published Mar 23, 2005
Detailed Description 25AA640/25LC640 64K SPI™ Bus Serial EEPROM Device Selection Table Part Number 25AA640 25LC640 25LC640 VCC Range 1.8-5...
Datasheet PDF File 25AA640 PDF File

25AA640
25AA640

Overview
25AA640/25LC640 64K SPI™ 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 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: 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 Package Types PDIP/SOIC CS 1 8 VCC SO 2 7 HOLD WP 3 6 SCK VSS 4 5 SI 25XX640 25XX640 Description The Microchip Technology Inc.
25AA640/25LC640 (25XX640*) is a 64K bit 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.
Block Diagram Status Register HV Generator I/O Control Logic Memory Control Logic XDEC EEPROM Array Page Latches SI SO CS SCK HOLD WP VCC VSS Y Decoder Sense Amp.
R/W Control TSSOP HOLD VCC CS SO 1 2 3 4 8 SCK 7 SI 6 VSS 5 WP *25XX640 is used in this document as a generic part number for the 25AA640/25LC640 devices.
 2003 Microchip Technology Inc.
DS21223F-page 1 25AA640/25LC640 1.
0 ELECTRICAL CHARACTERIST...


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