Microchip Technology AT21CS01 EEPROM

Microchip Technology AT21CS01 EEPROM device is self-powered via 1.7V to 3.6V pull-up voltage in the single I/O line low voltage operation. These AT21CS01 provide 1,024bits of serial EEPROM internally organized as 128 words of 8 bits each (1Kbit). This device shares a common single-wire bus with an I2C protocol structure from which communication is achieved through a single I/O pin. The AT21CS01 features a 15.4Kbps max bit rate in standard speed mode and a 125Kbps max bit rate in high-speed mode. 

Typical applications for the Microchip Technology AT21CS01 EEPROM include analog sensor calibration data storage, ink and toner printer cartridge identification, and management of aftermarket consumables.


  • 1.7V to 3.6V pull-up voltage on single I/O line
  • 128 words of 8bits each organized internally
  • Single-wire serial interface with I2C protocol structure
  • 8-byte Page write or single byte writes allowed
  • Discovery response feature for quick detection of devices on the bus
  • Four 256-bit ROM zones support
  • 256-bit security register
  • 5ms max self-timed write cycle
  • 1,000,000 write cycles endurance
  • Die sale options in wafer form and tape and reel
  • IEC 61000-4-2 Level 4 ESD Compliant


  • Analog sensor calibration data storage
  • Ink and toner printer cartridge identification
  • Management of after-market consumables

AT21CS01 Block Diagram

Microchip Technology AT21CS01 EEPROM
Gepubliceerd op: 2017-10-13 | Bijgewerkt op: 2022-03-28