CY62256EV18 Datasheet, PDF (1/14 Pages) Cypress Semiconductor – 256-Kbit (32 K × 8) Static RAM

CY62256EV18 MoBL^®
256-Kbit (32 K × 8) Static RAM
256-Kbit (32 K × 8) Static RAM
Features
■ Very high speed: 70 ns
■ Temperature ranges:
❐ Industrial: –40 °C to +85 °C
■ Wide voltage range: 1.65 V to 2.25 V
■ Pin compatible with CY62256N
■ Ultra low standby power
❐ Typical standby current: 1 µA
❐ Maximum standby current: 4 µA
■ Ultra low active power
❐ Typical active current: 1.3 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
■ Offered in Pb-free 28-pin Narrow SOIC package
Functional Description
The CY62256EV18 is a high performance CMOS static RAM
module organized as 32 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 when addresses are not toggling. 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 a write operation is in
progress (CE LOW and WE LOW).
To write to the device, take chip enable (CE) LOW and write
enable (WE) LOW. Data on the eight I/O pins is then written into
the location specified on the address pin (A₀ through A₁₄).
To read from the device, take chip enable (CE LOW) 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
I/O₀
INPUTBUFFER
A₁₀
I/O₁
A₉
A₈
I/O₂
A₇
A₆
A₅
32K x 8
ARRAY
I/O₃
A₄
I/O₄
A₃
A₂
I/O₅
CE
WE
COLUMN
POWER
DOWN
I/O₆
DECODER
OE
I/O₇
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 001-69650 Rev. *B
• San Jose, CA 95134-1709 • 408-943-2600
Revised September 4, 2012