DESCRIPTION
The CAT35C804A is a 4K-bit Serial E2PROM that safeguards stored data from unauthorized access by use of a user selectable (1 to 8 byte) access code and a movable memory pointer. Two operating modes provide unprotected and password-protected operation allowing the user to configure the device as anything from a ROM to a fully protected no-access memory. The CAT35C804A uses a UART compatible asynchronous protocol and has a Sequential Read feature where data can be sequentially clocked out of the memory array. The device is available in 8-pin DIP or 16-pin SOIC packages.

FEATURES
■ Single 5V Supply
■ Password READ/WRITE Protection: 1 to 8 Bytes
■ Memory Pointer WRITE Protection
■ Sequential READ Operation
■ 256 x16 or 512 x 8 Selectable Serial Memory
■ UART Compatible Asynchronous Protocol
■ 100,000 Program/Erase Cycles
■ Commercial, Industrial and Automotive Temperature Ranges
■ I/O Speed: 9600 Baud
    –Clock Frequency: 4.9152 MHz Xtal
■ Low Power Consumption:
    –Active: 3 mA
    –Standby: 250 µA
■ 100 Year Data Retention