DESCRIPTION

The Microchip Technology Inc. 25AA640/25LC640/25C640 (25xx640*) is a 64K bit 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, 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 µA typical

- Standby current: 500 nA typical

• 8192 x 8 bit organization

• 32 byte page

• Write cycle time: 5ms 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

- Endurance: 1M cycles (guaranteed)

- Data retention: > 200 years

- ESD protection: > 4000 V

• 8-pin PDIP, SOIC, and TSSOP packages

• Temperature ranges supported:

- Commercial: (C) 0°C to +70°C

- Industrial: (I) -40°C to +85°C

- Automotive: (E) (25C640) -40°C to +125°C

25AA640属于集成电路（IC） > 存储器。微芯科技股份有限公司制造生产的25AA640存储器存储器是集成电路上用作数据存储设备的半导体器件。这些器件分为非易失性或易失性两种，格式包括 CBRAM、DRAM、EEPROM、EERAM、EPROM、闪存、FRAM、NVSRAM、PCM (PRAM)、PSRAM、RAM 和 SRAM。这些器件的存储容量为 64 b 至 6 Tb 不等，接口有 I2C、MMC、并行、eMMC、串行、单线、SPI、UFS、Xccela 总线和 1-线。