MILITARY TEMPERATURE SRAM in a 16-pin ceramic DIP package

The MM54C89/MM74C89 is a 16-word by 4-bit random access read/write memory. Inputs to the memory consist of four address lines, four data input lines, a write enable line and a memory enable line. The four binary address inputs are decoded internally to select each of the 16 possible word locations.
It features a wide supply voltage range of 3.0V to 15V and a guaranteed noise margin of 1.0V. The four TRI-STATE data output lines working in conjunction with with the memory enable input provide for easy memory expansion.