Revision 2.2

April 2001

2

BSI

Input

Capacitance

6

pF

Input/Output

Capacitance

8

pF

OPERATING RANGE

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.

1. This parameter is guaranteed and not tested.

SYMBOL

PARAMETER

RATING

UNITS

Terminal

Voltage

with

Respect to GND

-0.5 to

Vcc+0.5

V

Temperature Under Bias

-40 to +125

Storage Temperature

-60 to +150

Power Dissipation

1.0

W

DC Output Current

20

mA

BS62LV256

RANGE

AMBIENT

TEMPERATURE

Vcc

Commercial

Industrial

R0201-BS62LV256

Name

Function

A0-A14 Address Input

These 15 address inputs select one of the 32768 x 8-bit words in the RAM

CE Chip Enable Input

CE is active LOW. Chip enables must be active when data read from or write to the

device. If chip enable is not active, the device is deselected and is in a 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 impedance state when OE is inactive.

DQ0 – DQ7 Data Input/Output

Ports

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

Vcc

Power Supply

Gnd

Ground

TRUTH TABLE

PIN DESCRIPTIONS

MODE

WE

CE

OE

I/O OPERATION

Vcc CURRENT

Not selected

X

H

X

High Z

I

Output Disabled

H

L

H

High Z

I

CC

Read

H

L

L

I

CC

Write

L

L

X

I

CC

SYMBOL

PARAMETER

CONDITIONS

MAX.

UNIT