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