CY62128V
1M (128K x 8) Static RAM
Features
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High speed: 55 ns and 70 ns
Wide voltage range: 2.7V–3.6V
Low active power and standby power
Easy memory expansion with CE1, CE2 and OE features
TTL-compatible inputs and outputs
Automatic power-down when deselected
CMOS for optimum speed/power
Package is available in a standard 450-mil-wide 32-lead
SOIC, 32-lead TSOP-I, 32-lead reverse TSOP-1, and
32-lead STSOP-1 package
Functional Description[1]
The CY62128V is composed of high-performance CMOS
static RAMs organized as 128K words by 8 bits. Easy memory
expansion is provided by an active LOW Chip Enable (CE1),
an active HIGH Chip Enable (CE2), an active LOW Output
Enable (OE) and three-state drivers. These devices have an
automatic power-down feature, reducing the power
consumption by over 99% when deselected.
Writing to the device is accomplished by taking Chip Enable
one (CE1) and Write Enable (WE) inputs LOW and the Chip
Enable two (CE2) input HIGH. Data on the eight I/O pins (I/O0
through I/O7) is then written into the location specified on the
address pins (A0 through A16).
Reading from the device is accomplished by taking Chip
Enable one (CE1) and Output Enable (OE) LOW while forcing
Write Enable (WE) and Chip Enable two (CE2) HIGH. Under
these conditions, the contents of the memory location
specified by the address pins will appear on the I/O pins.
The eight input/output pins (I/O0 through I/O7) are placed in a
high-impedance state when the device is deselected (CE1
HIGH or CE2 LOW), the outputs are disabled (OE HIGH), or
during a write operation (CE1 LOW, CE2 HIGH, and WE LOW).
Logic Block Diagram
I/O0
Data in Drivers
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
128K x 8
ARRAY
I/O2
SENSE AMPS
ROW DECODER
I/O1
I/O3
I/O4
I/O5
COLUMN
DECODER
CE1
CE2
I/O6
POWER
DOWN
I/O7
A12
A13
A14
A15
A16
WE
OE
Note:
1. For best practice recommendations, please refer to the Cypress application note “System Design Guidelines” on http://www.cypress.com.
Cypress Semiconductor Corporation
Document #: 38-05061 Rev. *B
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3901 North First Street
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San Jose
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CA 95134 • 408-943-2600
Revised August 27, 2002
