INTRODUCTION

The UT7C138 and UT7C139 are high-speed radiationhardened CMOS 4K x 8 and 4K x 9 dual-port static RAMs. Arbitration schemes are included on the UT7C138/139 to handle situations when multiple processors access the same memory location. Two ports provide independent, asynchronous access for reads and writes to any location in memory.

FEATURES

? 45ns and 55ns maximum address access time

? Asynchronous operation for compatibility with industry

standard 4K x 8/9 dual-port static RAM

? CMOS compatible inputs, TTL/CMOS compatible output

levels

? Three-state bidirectional data bus

? Low operating and standby current

? Radiation-hardened process and design; total dose

irradiation testing to MIL-STD-883 Method 1019

- Total-dose: 1.0E6 rads(Si)

- Memory Cell LET threshold: 85 MeV-cm2/mg

- Latchup immune (LET >100 MeV-cm2/mg)

? QML Q and QML V compliant part

? Packaging options:

- 68-lead Flatpack

- 68-pin PGA

? 5-volt operation

? Standard Microcircuit Drawing 5962-96845