DESCRIPTION
The Microchip Technology Inc. 25AA040/25LC040/25C040 (25xx040*) is a 4K 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.

FEATURES
• Low power CMOS technology
   - Write current: 3 mA typical
   - Read current: 500 µA typical
   - Standby current: 500 nA typical
• 512 x 8 bit organization
• 16 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: 10M 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) (25C040) -40°C to +125°C