81C55

E2O0014-27-X2 ¡ Semiconductor MSM81C55-5RS/GS/JS ¡ Semiconductor 2048-Bit CMOS STATIC RAM WITH I/O PORTS AND TIMER This version: Jan. 1998 MSM81C55-5RS/GS/JS Previous version: Aug. 1996 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) FUNCTIONAL BLOCK DIAGRAM IO/M A AD0 - 7 CE ALE RD WR RESET Timer C ...