Functional Description

The CY7C024E/CY7C0241E and CY7C025E/CY7C0251E are low-power CMOS 4K × 16/18 and 8K × 16/18 dual-port static RAMs. Various arbitration schemes are included on the CY7C024E/CY7C0241E and CY7C025E/CY7C0251E to handle situations when multiple processors access the same piece of data. Two ports are provided, permitting independent, asynchronous access for reads and writes to any location in memory.

Features

■ True dual-ported memory cells that allow simultaneous reads of the same memory location

■ 4K ×16 organization (CY7C024E)

■ 4K × 18 organization (CY7C0241E)

■ 8K × 16 organization (CY7C025E)

■ 8K × 18 organization (CY7C0251E)

■ 0.35-μ complementary metal oxide semiconductor (CMOS) for optimum speed and power

■ High-speed access: 15 ns

■ Low operating power: ICC = 180 mA (typ), ISB3 = 0.05 mA (typ)

■ Fully asynchronous operation

■ Automatic power-down

■ 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

■ Separate upper-byte and lower-byte control

■ Pin select for master or slave

■ Available in Pb-free 100-pin thin quad flatpack (TQFP) package