CY62148ESL_11 Datasheet, PDF (1/14 Pages) Cypress Semiconductor – 4-Mbit (512 K x 8) Static RAM Automatic power-down when deselected

CY62148ESL MoBL^®
4-Mbit (512 K × 8) Static RAM
4-Mbit (512 K × 8) Static RAM
Features
■ Higher speed up to 55 ns
■ Wide voltage range: 2.2 V to 3.6 V and 4.5 V to 5.5 V
■ 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
■ Complementary metal oxide semiconductor (CMOS) for
optimum speed and power
■ Available in Pb-free 32-Pin shrunk thin small outline package
(STSOP) package
Functional Description
The CY62148ESL is a high performance CMOS static RAM
organized as 512 K 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 in standby mode reduces
power consumption by more than 99 percent when deselected
(CE HIGH). The eight input and output pins (I/O₀ through I/O₇)
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 I/O pins (I/O₀ through I/O₇)
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 I/O pins.
Logic Block Diagram
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
CE
WE
OE
INPUT BUFFER
512K x 8
ARRAY
COLUMN DECODER
POWER
DOWN
I^IO^/O₀0
I^IO^/O₁1
I^IO^/O₂2
I^IO^/O₃3
I^IO^/O₄4
I^IO^/O₅5
I^IO^/O₆⁶
I^IO^/O₇⁷
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 001-50045 Rev. *D
• San Jose, CA 95134-1709 • 408-943-2600
Revised June 29, 2011