256K (32K x 8) Static RAM
CY62256N
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
, CA 95134-1709
•
408-943-2600
Document #: 001-06511 Rev. *A
Revised August 3, 2006
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–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/power
• Available in pb-free and non Pb-free 28-lead (600-mil)
PDIP, 28-lead (300-mil) narrow SOIC, 28-lead TSOP-I
and 28-lead Reverse TSOP-I packages
Functional Description[1]
The CY62256N 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 tri-state drivers. This device has an
automatic
power-down
feature,
reducing
the
power
consumption by 99.9% 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.
Note:
1. For best practice recommendations, please refer to the Cypress application note “System Design Guidelines” on http://www.cypress.com.
A9
A8
A7
A6
A5
A4
A3
A2
COLUMN
DECODER
INPUTBUFFER
POWER
DOWN
WE
OE
I/O0
CE
I/O1
I/O2
I/O3
32K x 8
ARRAY
I/O7
I/O6
I/O5
I/O4
A10
Logic Block Diagram
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