DESCRIPTION
The P4C422 is a 1,024-bit high-speed (10ns) Static RAM with a 256 x 4 organization. The memory requires no clocks or refreshing and has equal access and cycle times. Inputs and outputs are fully TTL compatible. Operation is from a single 5 Volt supply. Easy memory expansion is provided by an active LOW chip select one (CS 1) and active HIGH chip select two (CS2) as well as 3-state outputs.
In addition to high performance and high density, the device features latch-up protection, single event and upset protection. The P4C422 is offered in several packages: 22-pin 400 mil DIP (plastic and ceramic), 24- pin 300 mil SOIC, 24-pin square LCC and 24-pin CERPACK. Devices are offered in both commercial and military temperature ranges.

FEATURES
■ High Speed (Equal Access and Cycle Times)
    – 10/12/15/20/25/35 ns (Commercial)
    – 15/20/25/35 ns (Military)
■ CMOS for Low Power
    – 495 mW Max. – 10/12/15/20/25 (Commercial)
    – 495 mW Max. – 15/20/25/35 (Military)
■ Single 5V±10% Power Supply
■ Separate I/O
■ Fully TTL Compatible Inputs and Outputs
■ Resistant to single event upset and latchup resulting from advanced process and design improvements
■ Standard 22-pin 400 mil DIP, 24-pin 300 mil SOIC, 24-pin square LCC package and 24-pin CERPACK package