CY62256N_09 Datasheet, PDF (1/14 Pages) Cypress Semiconductor – 256K (32K x 8) Static RAM

CY62256N
256K (32K x 8) Static RAM
Features
■ Temperature Ranges
❐ Commercial: 0°C to 70°C
❐ Industrial: –40°C to 85°C
❐ Automotive-A: –40°C to 85°C
❐ Automotive-E: –40°C to 125°C
■ High Speed: 55 ns
■ Voltage Range: 4.5V to 5.5V Operation
■ Low Active Power
❐ 275 mW (max)
■ Low Standby Power (LL version)
❐ 82.5 μW (max)
■ Easy Memory Expansion with CE and OE Features
■ TTL-Compatible Inputs and Outputs
■ Automatic Power Down when Deselected
■ CMOS for Optimum Speed and Power
■ Available in Pb-free and Non Pb-free 28-Pin (600-mil) PDIP,
28-Pin (300-mil) Narrow SOIC, 28-Pin TSOP-I, and 28-Pin
Reverse TSOP-I Packages
Functional Description
The CY62256N^[1] is a high performance CMOS static RAM
organized as 32K words by 8 bits. Easy memory expansion is
provided by an active LOW chip enable (CE) and active LOW
output enable (OE) and tristate drivers. This device has an
automatic power down feature, reducing the power consumption
by 99.9 percent when deselected.
An active LOW write enable signal (WE) controls the
writing/reading operation of the memory. When CE and WE
inputs are both LOW, data on the eight data input/output pins
(I/O₀ through I/O₇) is written into the memory location addressed
by the address present on the address pins (A₀ through A₁₄).
Reading the device is accomplished by selecting the device and
enabling the outputs, CE and OE active LOW, while WE remains
inactive or HIGH. Under these conditions, the contents of the
location addressed by the information on address pins are
present on the eight data input/output pins.
The input/output pins remain in a high impedance state unless
the chip is selected, outputs are enabled, and write enable (WE)
is HIGH.
Logic Block Diagram
I/O₀
INPUTBUFFER
A₁₀
I/O₁
A₉
A₈
I/O₂
A₇
A₆
A₅
32K x 8
ARRAY
I/O₃
A₄
I/O₄
A₃
A₂
I/O₅
CE
WE
COLUMN
POWER
DOWN
I/O₆
DECODER
OE
I/O₇
Note
1. For best practice recommendations, do refer to the Cypress application note “System Design Guidelines” on http://www.cypress.com
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 001-06511 Rev. *B
• San Jose, CA 95134-1709 • 408-943-2600
Revised June 03, 2009
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