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DESCRIPTION

The Microchip Technology Inc. 28C04A is a CMOS 4K non-volatile electrically Erasable and Programmable Read Only Memory (EEPROM). The 28C04A is accessed like a static RAM for the read or write cycles without the need of external components. During a “byte write”, the address and data are latched internally, freeing the microprocessor address and data bus for other operations. Following the initiation of write cycle, the device will go to a busy state and automatically clear and write the latched data using an internal control timer.

FEATURES

? Fast Read Access Time—150 ns

? CMOS Technology for Low Power Dissipation

- 30 mA Active

- 100 μA Standby

? Fast Byte Write Time—200 μs or 1 ms

? Data Retention >200 years

? Endurance - Minimum 104 Erase/Write Cycles

- Automatic Write Operation

- Internal Control Timer

- Auto-Clear Before Write Operation

- On-Chip Address and Data Latches

? Data Polling

? Chip Clear Operation

? Enhanced Data Protection

- VCC Detector

- Pulse Filter

- Write Inhibit

? 5-Volt-Only Operation

? Organized 512x8 JEDEC standard pinout

- 24-pin Dual-In-Line Package

- 32-pin PLCC Package

? Available for Extended Temperature Ranges:

- Commercial: 0°C to +70°C

- Industrial: -40°C to +85°C