4K x 8/9 Dual-Port Static RAM
CY7C138 CY7C1394K x 8/9 Dual-Port Static RAM with Sem, Int, Busy
CY7C138 CY7C139
Features
• True Dual-Ported memory ce...
Description
CY7C138 CY7C1394K x 8/9 Dual-Port Static RAM with Sem, Int, Busy
CY7C138 CY7C139
Features
True Dual-Ported memory cells that allow simultaneous reads of the same memory location
4K x 8 organization (CY7C138) 4K x 9 organization (CY7C139) 0.65-micron CMOS for optimum speed/power High-speed access: 15 ns Low operating power: ICC = 160 mA (max.) Fully asynchronous operation Automatic power-down TTL compatible Expandable data bus to 32/36 bits or more using
Master/Slave chip select when using more than one device On-chip arbitration logic Semaphores included to permit software handshaking between ports INT flag for port-to-port communication Available in 68-pin PLCC Pb-Free packages available
Functional Description
The CY7C138 and CY7C139 are high-speed CMOS 4K x 8 and 4K x 9 dual-port static RAMs. Various arbitration schemes
Logic BlockDiagram
R/WL
CEL OEL
4K x 8/9 Dual-Port Static RAM with Sem, Int, Busy
are included on the C...
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