CY62128E_09 Datasheet, PDF (1/12 Pages) Cypress Semiconductor – 1-Mbit (128K x 8) Static RAM

MoBL^® CY62128E
1-Mbit (128K x 8) Static RAM
Features
■ Very high speed: 45 ns
■ Temperature ranges
❐ Industrial: –40°C to +85°C
❐ Automotive-A: –40°C to +85°C
❐ Automotive-E: –40°C to +125°C
■ Voltage range: 4.5V to 5.5V
■ Pin compatible with CY62128B
■ Ultra low standby power
❐ Typical standby current: 1 μA
❐ Maximum standby current: 4 μA (Industrial)
■ Ultra low active power
❐ Typical active current: 1.3 mA at f = 1 MHz
■ Easy memory expansion with CE₁, CE_2, and OE features
■ Automatic power down when deselected
■ CMOS for optimum speed and power
■ Offered in standard Pb-free 32-pin STSOP, 32-pin SOIC, and
32-pin TSOP I packages
Logic Block Diagram
Functional Description
The CY62128E^[1] is a high performance CMOS static RAM
organized as 128K words by 8 bits. This device features
advanced circuit design to provide ultra low active current. This
is ideal for providing More Battery Life™ (MoBL^®) in portable
applications such as cellular telephones. The device also has an
automatic power down feature that significantly reduces power
consumption when addresses are not toggling. Placing the
device into standby mode reduces power consumption by more
than 99 percent when deselected (CE₁ HIGH or CE₂ LOW). The
eight input and output pins (IO₀ through IO₇) are placed in a high
impedance state when the device is deselected (CE₁ HIGH or
CE₂ LOW), the outputs are disabled (OE HIGH), or a write
operation is in progress (CE₁ LOW and CE₂ HIGH and WE LOW)
To write to the device, take Chip Enable (CE₁ LOW and CE₂
HIGH) and Write Enable (WE) inputs LOW. Data on the eight IO
pins (IO₀ through IO₇) is then written into the location specified
on the address pins (A₀ through A₁₆).
To read from the device, take Chip Enable (CE₁ LOW and CE₂
HIGH) and Output Enable (OE) LOW while forcing Write Enable
(WE) HIGH. Under these conditions, the contents of the memory
location specified by the address pins appear on the IO pins.
INPUT BUFFER
IO0
A0
A1
IO1
A2
A3
IO2
A4
A5
128K x 8
IO3
A6
A7
ARRAY
IO4
A8
A9
IO5
A10
A11
IO6
CE1
CE2
WE
COLUMN DECODER
POWER
DOWN
IO7
OE
Note
1. For best practice recommendations, refer to the Cypress application note “System Design Guidelines” at http://www.cypress.com.
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 38-05485 Rev. *F
• San Jose, CA 95134-1709 • 408-943-2600
Revised August 4, 2008
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