CY62148ESL Datasheet, PDF (1/10 Pages) Cypress Semiconductor – 4-Mbit (512K x 8) Static RAM

Features
■ Very high speed: 55 ns
■ Wide voltage range: 2.2V to 3.6V and 4.5V to 5.5V
■ Ultra low standby power
❐ Typical standby current: 1 μA
❐ Maximum standby current: 7 μA
■ Ultra low active power
❐ Typical active current: 2 mA at f = 1 MHz
■ Easy memory expansion with CE and OE features
■ Automatic power down when deselected
■ CMOS for optimum speed and power
■ Available in Pb-free 32-pin STSOP package
Logic Block Diagram
CY62148ESL MoBL^®
4-Mbit (512K x 8) Static RAM
Functional Description
The CY62148ESL is a high performance CMOS static RAM
organized as 512K 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. Placing the device into standby mode reduces
power consumption by more than 99 percent when deselected
(CE HIGH). The eight input and output pins (IO₀ through IO₇) are
placed in a high impedance state when the device is deselected
(CE HIGH), the outputs are disabled (OE HIGH), or during a write
operation (CE LOW and WE LOW).
To write to the device, take Chip Enable (CE) 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 A₁₈).
To read from the device, take Chip Enable (CE) 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.
For best practice recommendations, refer to the Cypress
application note AN1064, SRAM System Guidelines.
A0
A1
INPUT BUFFER
IO0
A2
A3
IO1
A4
A5
IO2
A6
A7
512K x 8
IO3
A8
A9
ARRAY
IO4
A10
A11
IO5
A12
IO6
CE
WE
COLUMN DECODER
POWER
DOWN
IO7
OE
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 001-50045 Rev. **
• San Jose, CA 95134-1709 • 408-943-2600
Revised January 21, 2009
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