The Microchip AT21CS11 is a 1 Kb Serial EEPROM utilizing the Single-Wire bus. Only two pins are needed to access the device: SI/O and GND. The SI/O signal is a combination data and power line, providing power to the device with a parasitic power scheme. The device is organized as one block of 128 x 8 and is optimized for use in consumer and industrial applications where reliable and dependable nonvolatile memory storage is essential. The EEPROM is available in a variety of space-saving packaging options.

The AT21CS11 features a 256-bit Security register which includes a 64-bit serial number. The device also features manufacturer ID support in which the device responds with a unique value for density and revision information.

• 128 x 8 (1 Kbit)
• Single-Wire Compatible
  • I²C Protocol Structure
  • Communication through a single I/O pin
• High Speed (125 kbps) Mode
• Self-Timed Erase and Write Cycles (5 ms max.)
• Low Power Consumption
  • Read current 0.08 mA (Typ), 0.3 mA (Max)
  • Write current 0.2 mA (Typ), 0.5 mA (Max)
  • Standby current 0.7 uA (Typ), 2.5 uA (Max)
• Software Write Protection
  • Four independent 256-bit zones
• More than 1 million erase/write cycles
• Data retention > 100 years
• ESD protection > 8000V (HBM)
• Factory Programming Available
• Available in 8-pin SOIC (150 mil), 3-pin SOT23, 2-pad XSFN, and 4-ball Thin CSP packages.