BS62UV256

R0201-BS62UV256

Revision

2.7

Oct.

2008

2

PIN DESCRIPTIONS

Name

Function

A0-A14 Address Input

These 15 address inputs select one of the 32,768 x 8-bit in the RAM

CE Chip Enable Input

CE is active LOW. Chip enable must be active when data read form or write to the

device. If chip enable is not active, the device is deselected and is in standby power

mode. The DQ pins will be in the high impedance state when the device is deselected.

WE Write Enable Input

The write enable input is active LOW and controls read and write operations. With the

chip selected, when WE is HIGH and OE is LOW, output data will be present on the

DQ pins; when WE is LOW, the data present on the DQ pins will be written into the

selected memory location.

OE Output Enable Input

The output enable input is active LOW. If the output enable is active while the chip is

selected and the write enable is inactive, data will be present on the DQ pins and they

will be enabled. The DQ pins will be in the high impendence state when OE is inactive.

DQ0-DQ7 Data Input/Output

Ports

There 8 bi-directional ports are used to read data from or write data into the RAM.

Power Supply

GND

Ground

TRUTH TABLE

MODE

CE

WE

OE

I/O OPERATION

Not selected

(Power Down)

H

X

X

High Z

Output Disabled

L

H

H

High Z

Read

L

H

L

Write

L

L

X

ABSOLUTE MAXIMUM RATINGS

(1)

SYMBOL

PARAMETER

RATING

UNITS

Terminal Voltage with

Respect to GND

-0.5

V

Temperature Under

Bias

-40 to +125

Storage Temperature

-60 to +150

Power Dissipation

1.0

W

DC Output Current

20

mA

1. Stresses greater than those listed under ABSOLUTE

MAXIMUM RATINGS may cause permanent damage to the

device. This is a stress rating only and functional operation of

the device at these or any other conditions above those

indicated in the operational sections of this specification is not

implied. Exposure to absolute maximum rating conditions for

extended periods may affect reliability.

2. –2.0V in case of AC pulse width less than 30 ns.

OPERATING RANGE

RANG

AMBIENT

TEMPERATURE

Commercial

0

1.8V ~ 3.6V

Industrial

-40

1.8V ~ 3.6V

CAPACITANCE

SYMBOL PAMAMETER CONDITIONS MAX. UNITS

Input

Capacitance

6

pF

Input/Output

Capacitance

8

pF

1. This parameter is guaranteed and not 100% tested.