Datasheet > WCMB4016R4X

WCMB4016R4X

更新时间： 2022-09-11 11:37:41

品牌	Logo	应用领域
韦达 - WEIDA		/
页数	文件大小	规格书
12页	218K
描述
256K x 16 Static RAM

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中文翻译

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数据手册

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WCMB4016R4X 数据手册

WCMB4016R4X

256K x 16 Static RAM

and BHE are HIGH). The input/output pins (I/O₀through I/O₁₅

)

Features

are placed in a high-impedance state when: deselected (CE

HIGH), outputs are disabled (OE HIGH), both Byte High En-

able and Byte Low Enable are disabled (BHE, BLE HIGH), or

during a write operation (CE LOW and WE LOW).

• Low voltage range:

— 1.65V−1.95V

• Ultra-low active power

— Typical Active Current: 0.5 mA @ f = 1 MHz

Writing to the device is accomplished by taking Chip Enable

(CE) and Write Enable (WE) inputs LOW. If Byte Low Enable

(BLE) is LOW, then data from I/O pins (I/O₀through I/O₇), is

written into the location specified on the address pins (A₀

through A₁₇). If Byte High Enable (BHE) is LOW, then data

from I/O pins (I/O₈through I/O₁₅) is written into the location

specified on the address pins (A₀through A₁₇).

— Typical Active Current: 2 mA @ f = f_max(70 ns speed)

• Low standby power

• Easy memory expansion with CE and OE features

• Automatic power-down when deselected

• CMOS for optimum speed/power

Reading from the device is accomplished by taking Chip En-

able (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

will appear on I/O₀to I/O₇. If Byte High Enable (BHE) is LOW,

then data from memory will appear on I/O₈to I/O₁₅. See the

Truth Table at the back of this data sheet for a complete de-

scription of read and write modes.

Functional Description

The WCMB4016R4X 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 device is ideal for portable applications such as cellular

telephones. The device also has an automatic power-down

feature that significantly reduces power consumption by 99%

when addresses are not toggling. The device can also be put

into standby mode when deselected (CE HIGH or both BLE

The WCMB4016R4X is available in a 48-ball FBGA package.

Logic Block Diagram

DATA IN DRIVERS

256K x 16

RAM Array

I/O –I/O

2048 X 2048

I/O –I/O

COLUMN DECODER

BHE

BLE

Power -Down

Circuit

BHE

BLE

Created January 17, 2002

12 3 4 5 6 7...12

中文翻译

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