IS61LPS51218A_12 Datasheet, PDF (1/35 Pages) Integrated Silicon Solution, Inc – 256K x 36, 256K x 32, 512K x 18 9 Mb SYNCHRONOUS PIPELINED, SINGLE CYCLE DESELECT STATIC RAM

IS61LPS51218A, IS61LPS25636A, IS61LPS25632A, IS64LPS25636A,
IS61VPS51218A, IS61VPS25636A
256K x 36, 256K x 32, 512K x 18
9 Mb SYNCHRONOUS PIPELINED,
SINGLE CYCLE DESELECT STATIC RAM
SEPTEMBER 2012
FEATURES
• Internal self-timed write cycle
• Individual Byte Write Control and Global Write
• Clock controlled, registered address, data and
control
• Burst sequence control using MODE input
• Three chip enable option for simple depth ex-
pansion and address pipelining
• Common data inputs and data outputs
• Auto Power-down during deselect
• Single cycle deselect
• Snooze MODE for reduced-power standby
• JTAG Boundary Scan for PBGA package
• Power Supply
LPS: Vdd 3.3V + 5%, Vddq 3.3V/2.5V + 5%
VPS: Vdd 2.5V + 5%, Vddq 2.5V + 5%
• JEDEC 100-Pin TQFP, 119-ball PBGA, and
165-ball PBGA packages
• Lead-free available
FAST ACCESS TIME
Symbol
Parameter
tkq
Clock Access Time
tkc
Cycle Time
Frequency
DESCRIPTION
The  ISSI IS61LPS/VPS25636A, IS61LPS25632A,
IS64LPS25636A and IS61LPS/VPS51218A are high-
speed, low-power synchronous static RAMs designed
to provide burstable, high-performance memory for com-
munication and networking applications. The IS61LPS/
VPS25636A and IS64LPS25636A are organized as
262,144 words by 36 bits. The IS61LPS25632A is
organized as 262,144 words by 32 bits. The IS61LPS/
VPS51218A is 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 positive-edge-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
one to four bytes wide as controlled by the write control
inputs.
Separate byte enables allow individual bytes to be written.
The byte write operation is performed by using the byte
write enable (BWE) input combined with one or more
individual byte write signals (BWx). In addition, Global
Write (GW) is available for writing all bytes at one time,
regardless of the byte write controls.
Bursts can be initiated with either ADSP (Address Status
Processor) or ADSC (Address Status Cache Controller)
input pins. Subsequent burst addresses can be gener-
ated internally and controlled by the ADV (burst address
advance) input pin.
The mode pin is used to select the burst sequence or-
der, Linear burst is achieved when this pin is tied LOW.
Interleave burst is achieved when this pin is tied HIGH
or left floating.
250
200
166
2.6
3.1
3.5
4
5
6
250
200
166
Units
ns
ns
MHz
Copyright © 2012 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no
liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on
any published information and before placing orders for products.
Integrated Silicon Solution, Inc.
1
Rev. L
09/06/12