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MSM81C55-5RS PDF预览

MSM81C55-5RS

更新时间: 2024-01-16 03:36:52
品牌 Logo 应用领域
冲电气 - OKI 外围集成电路光电二极管
页数 文件大小 规格书
19页 157K
描述
2048-Bit CMOS STATIC RAM WITH I/O PORTS AND TIMER

MSM81C55-5RS 数据手册

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E2O0014-27-X2  
This version: Jan. 1998  
Previous version: Aug. 1996  
¡ Semiconductor  
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  
silicongateCMOStechnologyandconsumesastandbycurrentof100microampere,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  
Port A  
IO/M  
8
PA0 - 7  
PB0 - 7  
PC0 - 5  
A
B
C
AD0 - 7  
256 ¥ 8  
Static  
RAM  
CE  
ALE  
RD  
Port B  
8
Port C  
6
WR  
RESET  
Timer  
TIMER IN  
VCC (+5 V)  
GND (0 V)  
TIMER OUT  
1/19  

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