Cypress CY62146EV30 用户手册

4-Mbit (256K x 16) Static RAM

•

198 Champion Court

•

San Jose

,

CA 95134-1709

•

408-943-2600

Document #: 38-05567 Rev. *C

 Revised March 26, 2007

• Very high speed: 45 ns

• Wide voltage range: 2.20V–3.60V

• Pin compatible with CY62146DV30

• Ultra low standby power

— Typical standby current: 1 

µA

— Maximum standby current: 7 

µA

• Ultra low active power

—  Typical active current: 2 mA @ f = 1 MHz

• Easy memory expansion with CE, and OE features

• Automatic power down when deselected

• CMOS for optimum speed and power

• Available in a Pb-free 48-ball VFBGA and 44-pin TSOP II 

packages

The CY62146EV30 is a high performance CMOS static RAM
organized as 256K 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 by 80% when addresses are not
toggling. The device can also be put into standby mode
reducing power consumption by more than 99% when
deselected (CE HIGH). The input and output pins (IO

0

 through

IO

15

) are placed in a high impedance state when: 

• Deselected (CE HIGH)

• Outputs are disabled (OE HIGH)

• Both Byte High Enable and Byte Low Enable are disabled 

(BHE, BLE HIGH)

• Write operation is active (CE LOW and WE LOW)

Write to the device by taking Chip Enable (CE) and Write
Enable (WE) inputs LOW. If Byte Low Enable (BLE) is LOW,
then data from IO pins (IO

0

 through IO

7

), is written into the

location specified on the address pins (A

0

 through A

17

). If Byte

High Enable (BHE) is LOW, then data from IO pins (IO

8

through IO

15

) is written into the location specified on the

address pins (A

0

 through A

17

).

Read from the device by taking Chip Enable (CE) 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 IO

0

 to IO

7

. If

Byte High Enable (BHE) is LOW, then data from memory
appears on IO

8

 to IO

15

 for a

complete description of read and write modes.

µA)

[2]

CY62146EV30LL

2.2

3.0

3.6

45 ns

2

2.5

15

20

1

7

1. For best practice recommendations, please refer to the Cypress application note System Design Guidelines on 

http://www.cypress.com

.

2. Typical values are included for reference only and are not guaranteed or tested. Typical values are measured at V

CC

 = V

CC(typ)

, T

A

 = 25°C.