CY62157E_11 Datasheet, PDF (1/18 Pages) Cypress Semiconductor – 8-Mbit (512 K x 16) Static RAM Automatic power down when deselected

CY62157E MoBL^®
8-Mbit (512 K × 16) Static RAM
8-Mbit (512 K × 16) Static RAM
Features
■ Very high speed: 45 ns
❐ Industrial: –40 °C to +85 °C
❐ Automotive-E: –40 °C to +125 °C
■ Wide voltage range: 4.5 V–5.5 V
■ Ultra low standby power
❐ Typical standby current: 2 A
❐ Maximum standby current: 8 A (Industrial)
■ Ultra low active power
❐ Typical active current: 1.8 mA at f = 1 MHz
■ Ultra low standby power
■ Easy memory expansion with CE₁, CE₂ and OE features
■ Automatic power down when deselected
■ CMOS for optimum speed and power
■ Available in Pb-free 44-pin TSOP II and 48-ball VFBGA
package
Functional Description
The CY62157E is a high performance CMOS static RAM
organized as 512K words by 16 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. Place the device
into standby mode when deseleMoBL^®cted (CE₁ HIGH or CE₂
LOW or both BHE and BLE are HIGH). The input or output pins
(I/O₀ through I/O₁₅) are placed in a high impedance state when:
■ Deselected (CE₁HIGH or CE₂ LOW)
■ Outputs are disabled (OE HIGH)
■ Both Byte High Enable and Byte Low Enable are disabled
(BHE, BLE HIGH)
■ Write operation is active (CE₁ LOW, CE₂ HIGH and WE LOW)
To write to the device, take Chip Enable (CE₁ LOW and CE₂
HIGH) and Write Enable (WE) inputs LOW. If Byte Low Enable
(BLE) is LOW, then data from I/O pins (I/O₀ through I/O₇), is
written into the location specified on the address pins (A₀ through
A₁₈). If Byte High Enable (BHE) is LOW, then data from I/O pins
(I/O₈ through I/O₁₅) is written into the location specified on the
address pins (A₀ through A₁₈).
To read from the device, take Chip Enable (CE₁ LOW and CE₂
HIGH) and Output Enable (OE) LOW while forcing the Write
Enable (WE) HIGH. If Byte Low Enable (BLE) is LOW, then data
from the memory location specified by the address pins appear
on I/O₀ to I/O₇. If Byte High Enable (BHE) is LOW, then data from
memory appears on I/O₈ to I/O₁₅. See Truth Table on page 12
for a complete description of read and write modes.
Logic Block Diagram
A₁₀
A₉
A₈
A₇
A₆
A₅
A₄
A₃
A₂
A₁
A₀
DATA IN DRIVERS
512K x 16
RAM Array
I/O₀–I/O₇
I/O₈–I/O₁₅
Power Down
Circuit
CE₂
CE₁
BHE
BLE
COLUMN DECODER
BHE
WE
CE₂
OE
CE₁
BLE
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 38-05695 Rev. *H
• San Jose, CA 95134-1709 • 408-943-2600
Revised May 30, 2011
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