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