256Kx32 Synchronous Pipelined Static RAM
Description
IS61SPS25632T/D IS61LPS25632T/D IS61SPS25636T/D IS61LPS25636T/D IS61SPS51218T/D IS61LPS51218T/D
256K x 32, 256K x 36, 512K x 18 SYNCHRONOUS PIPELINE, SINGLE-CYCLE DESELECT STATIC RAM
FEATURES
• Internal self-timed write cycle • Individual Byte Write Control and Global Write • Clock controlled, registered address, data and control • Linear burst sequence control using MODE input • Three chip enable option for simple depth expansion and address pipelining • Common data inputs and data outputs • JEDEC 100-Pin TQFP and 119-pin PBGA package • Single +3.
3V, +10%, –5% power supply • Power-down snooze mode • 3.
3V I/O For SPS • 2.
5V I/O For LPS • Single cycle deselect • Snooze MODE for reduced-power standby • T version (three chip selects) • D version (two chip selects)
ISSI
®
PRELIMINARY INFORMATION MAY 2001
DESCRIPTION The ISSI IS61SPS25632, IS61SPS25636, IS61SPS51218,
IS61LPS25632, IS61LPS25636, and IS61LPS51218 are high-speed, low-power synchronous static RAMs designed to provide a burstable, high-performance memory for communication and networking applications.
The IS61SPS25632 and IS61LPS25632 are organized as 262,144 words by 32 bits and the IS61SPS25636 and IS61LPS25636 are organized as 262,144 words by 36 bits.
The IS61SPS51218 and IS61LPS51218 are organized as 524,288 words by 18 bits.
Fabricated with ISSI's 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 positiveedge-triggered single clock input.
Write cycles are internally self-timed and are initiated by the rising edge of the clock input.
Write cycles can be from one to four bytes wide as controlled by the write control inputs.
Separate byte enables allow individual bytes to be written.
Byte write operation is performed by using byte write enable (BWE).
input combined with one or more individual byte write signals (BWx).
In addition, Glo...
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