DESCRIPTION

The ISSI IS61SP6464 is a high-speed, low-power synchronous static RAM designed to provide a burstable, high performance, secondary cache for the i486?, Pentium?, 680X0?, and PowerPC? microprocessors. It is organized as 65,536 words by 64 bits, fabricated with ISSIs advanced CMOS technology. The device integrates a 2-bit burst counter, high-speed SRAM core, and high-drive capability outputs into a single monolithic circuit. All synchronous inputs pass through registers controlled by a positive-edge-triggered single clock input.

FEATURES

? Fast access time:

– 133, 117, 100 MHz; 6 ns (83 MHz);

7 ns (75 MHz); 8 ns (66 MHz)

? Internal self-timed write cycle

? Individual Byte Write Control and Global Write

? Clock controlled, registered address, data and control

? Pentium? or linear burst sequence control using MODE input

? Five chip enables for simple depth expansion and address pipelining

? Common data inputs and data outputs

? Power-down control by ZZ input

? JEDEC 128-Pin TQFP 14mm x 20mm package

? Single +3.3V power supply

? Control pins mode upon power-up:

– MODE in interleave burst mode

– ZZ in normal operation mode

These control pins can be connected to GNDQ or VCCQ to alter their power-up state