General Description
The AK6420B/40B/80B is a 2048/4096/8192bit, serial, read/write, non-volatile memory device fabricated using an advanced CMOS E2PROM technology. The AK6420B has 2048bits of memory organized into 128 registers of 16 bits each. The AK6440B has 4096bits of memory organized into 256 registers of 16 bits each.

FEATUREs
□ ADVANCED CMOS EEPROM TECHNOLOGY
□ Wide Vcc (1.8V ∼ 5.5V) operation
□ AK6420B • • 2048 bits: 128 Õ 16 organization
    AK6440B • • 4096 bits: 256 Õ 16 organization
    AK6480B • • 8192 bits: 512 Õ 16 organization
□ ONE CHIP MICROCOMPUTER INTERFACE
    - Interface with one chip microcomputers serial communication port directly
□ LOW POWER CONSUMPTION
    - 0.8µA Max (Standby mode)
□ HIGH RELIABILITY
    -Endurance : 100K cycles
    -Data Retention : 10 years
□ SPECIAL FEATURES
    - High speed operation ( fMAX=1MHz: Vcc=2.5V )
    - Automatic write cycle time-out with auto-ERASE
    - Automatic address increment (READ)
    - Software and Hardware controlled write protection
□ IDEAL FOR LOW DENSITY DATA STORAGE
    - Low cost, space saving, 8-pin package (MSOP)