CY62256VN
256K (32K x 8) Static RAM
Features
Functional Description
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Temperature Ranges
The CY62256VN[1] family is composed of two high performance
CMOS static RAM’s 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.
These devices have an automatic power down feature, reducing
the power consumption by over 99% when deselected.
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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
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Speed: 70 ns
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.
Low Voltage Range: 2.7V to 3.6V
Low Active Power and Standby Power
Easy Memory Expansion with CE and OE Features
TTL Compatible Inputs and Outputs
Automatic Power Down when Deselected
CMOS for Optimum Speed and Power
The input/output pins remain in a high impedance state unless
the chip is selected, outputs are enabled, and write enable (WE)
is HIGH.
Available in Standard Pb-free and non Pb-free 28-Pin (300-mil)
Narrow SOIC, 28-Pin TSOP-I, and 28-Pin Reverse TSOP-I
Packages
Logic Block Diagram
I/O
I/O
I/O
I/O
I/O
I/O
I/O
0
1
2
3
4
5
6
INPUTBUFFER
A
A
A
10
9
8
A
7
6
5
A
32K x 8
ARRAY
A
A
A
A
4
3
2
CE
WE
POWER
DOWN
COLUMN
DECODER
I/O
7
OE
.
Note
1. For best practice recommendations, refer to the Cypress application note “System Design Guidelines” on http://www.cypress.com.
Cypress Semiconductor Corporation
Document #: 001-06512 Rev. *B
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised September 25, 2009
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