CY7C139
CY7C139 is 4K x 8/9 Dual-Port Static RAM manufactured by Cypress.
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 m A (max.)
- Fully asynchronous operation
- Automatic power-down
- TTL patible
- 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 munication
- 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 Block Diagram
R/WL
CEL OEL
4K x 8/9 Dual-Port Static RAM with Sem, Int, Busy are included on the...
