25AA640

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...