X88257

X88257 8051 Microcontroller Family Compatible 256K X88257 E2 Micro-Peripheral DESCRIPTION 32,768 x 8 Bit FEATURES Multiplexed Address/Data Bus —Direct Interface to Popular 8051 Family High Performance CMOS —Fast Access Time, 120ns —Low Power —60mA Active Maximum —500µA Standby Maximum Software Data Protection Toggle Bit Polling —Early End of Write Detection Page Mode Write —Allows up to 128 Bytes to be Written in One Write Cycle High Reliability —Endurance: 10,000 Write Cycle —Data Retention: 100 Years 28-Lead PDIP Package 28-Lead SOIC Package 32-Lead PLCC Package The X88257 is an 32K x 8 E2PROM fabricated with advanced CMOS Textured Poly Floating Gate Technology. The X88257 features a multiplexed address and data bus allowing direct interface to a variety of popular single-chip microcontrollers operating in expanded multiplexed mode without the need for additional interface circuitry. FUNCTIONAL DIAGRAM CE, CE WR RD PSEN A8–A14 CONTROL LOGIC X D E C O D E SOFTWARE DATA PROTECT ALE L A T C H E S 32K x 8 E2PROM Y DECODE I/O & ADDRESS LATCHES AND BUFFERS A/D0–A/D7 6509 ILL F02.1 © Xicor, Inc. 1994-1997 Patents Pending 6509-1.9 4/9/96 T2/C5/D8 NS 1 Characteristics subject to change without notice X88257 PIN DESCRIPTIONS Address/Data (A/D0–A/D7) Multiplexed low-order addresses and data. The addresses flow into the device while ALE is HIGH. After ALE transitions from a HIGH to LOW the addresses are latched. Once the addresses are latched these pins...