MSM81C55-5GS DIP-40

2048Bit CMOS STATIC RAM WITH I/O PORTS AND TIMER

MSM81C55-5RS/GS/JS 2048-Bit CMOS STATIC RAM WITH I/O PORTS AND TIMER

GENERAL DESCRIPTION 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. Featureing 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). The MSM81C55-5 also contains a 14-bit programmable counter/timer which may be used for sequence-wave generation or terminal count-pulsing. FEATURES •High speed and low power achieved with silicon gate CMOS technology •256 words x 8bits RAM •Single power supply, 3 to 6 V •Completely static operation •On-chip address latch •8-bit programmable I/O ports (port A and B) •TTL Compatible •RAM data hold characteristic at 2 V •6-bit programmable I/O port (port C) •14-bit programmable binary counter/timer •Multiplexed address/data bus •Direct interface with MSM80C85AH •40-pin Plastic DIP (DIP40-P-600-2.54): (Product name: MSM81C55-5RS) •44-pin Plastic QFJ (QFJ44-P-S650-1.27): (Product name: MSM81C55-5JS) •44-pin Plastic QFP (QFP44-P-910-0.80-2K): (Product name: MSM81C55-5GS-2K)