DESCRIPTION
The ISSI IS61C632A is a high-speed, low-power synchronous static RAM designed to provide a burstable, highperformance, secondary cache for the i486™, Pentium™, 680X0™, and PowerPC™ microprocessors. It is organized as 32,768 words by 32 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:
    – 4 ns-125 MHZ; 5 ns-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
• Three chip enables for simple depth expansion and address pipelining
• Common data inputs and data outputs
• Power-down control by ZZ input
• JEDEC 100-Pin TQFP and PQFP package
• Single +3.3V power supply
• Two Clock enables and one Clock disable to eliminate multiple bank bus contention.
• 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