Functional Description

The CY7C1325 is a 3.3V 256K by 18 synchronous cache RAM designed to interface with high-speed microprocessors with minimum glue logic. Maximum access delay from clock rise is 7.5 ns (117-MHz version). A 2-bit on-chip counter captures the first address in a burst and increments the address automatically for the rest of the burst access.

Features

• Supports 117-MHz microprocessor cache systems with zero wait states

• 256K by 18 common I/O

• Low Standby Power (6.6 mW, L version)

• Fast clock-to-output times

— 7.5 ns (117-MHz version)

• Two-bit wrap-around counter supporting either interleaved or linear burst sequence

• Separate processor and controller address strobes provides direct interface with the processor and external cache controller

• Synchronous self-timed write

• Asynchronous output enable

• I/Os capable of 2.5–3.3V operation

• JEDEC-standard pinout

• 100-pin TQFP packaging

• ZZ “sleep” mode