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The D81C55HC-2, D8155HC-2, D8155 are 2k-bit static RAM (256 bytes) with parallel I/O ports and a timer. It uses silicon gate CMOS technology and consumes a standby current of 100 micro ampere, maximum, while the chip is not selected.
The MSM81C55-5 has a 2k-bit static RAM (256 bytes) with parallel I/O ports and a timer. It uses
silicon gate CMOS technology and consumes a standby current of 100 micro ampere, maximum,
while the chip is not selected. Featuring a maximum access time of 400 ns, the MSM81C55-5
can be used in an MSM80C85AH system without using wait states. The parallel I/O consists
of two 8-bit ports and one 6-bit port (both general purpose) 5 also contains a 14-bit programmable counter/timer which may be used for
sequence-wave generation or terminal count-pulsing. Datasheet: PDF Features: Packing List: 1Pc * D81C55HC-2 2k RAM With I/O and Timer IC