CY62138EV30_12 Datasheet, PDF (1/16 Pages) Cypress Semiconductor – 2-Mbit (256 K × 8) MoBL Static RAM

CY62138EV30 MoBL^®
2-Mbit (256 K × 8) MoBL^® Static RAM
2-Mbit (256 K × 8) MoBL® Static RAM
Features
■ Very high speed: 45 ns
❐ Wide voltage range: 2.20 V to 3.60 V
■ Pin compatible with CY62138CV30
■ Ultra low standby power
❐ Typical standby current: 1 A
❐ Maximum standby current: 7 A
■ 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
■ Offered in Pb-free 36-ball ball grid array (BGA) package
Functional Description
The CY62138EV30 is a high performance CMOS static RAM
organized as 256K words by eight 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. The device can be put into standby mode reducing
power consumption when deselected (CE HIGH).
Writing to the device is accomplished by taking 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).
Reading from the device is accomplished by taking 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.
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).
Logic Block Diagram
AAAAAAAAAAAA_{11120345807691}
CE
WE
OE
Data in Drivers
256K x 8
ARRAY
COLUMN
DECODER
POWER
DOWN
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 38-05577 Rev. *E
• San Jose, CA 95134-1709 • 408-943-2600
Revised November 8, 2012