R0201-BS62LV1027

Revision 2.1

Jan.

2004

2

BSI

BS62LV1027

SYMBOL

PARAMETER

CONDITIONS

MAX.

UNIT

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 100% tested.

SYMBOL

PARAMETER

RATING

UNITS

Terminal Voltage with

Respect to GND

-0.5 to

Vcc+0.5

V

Temperature Under Bias

-40 to +85

Storage Temperature

-60 to +150

Power Dissipation

1.0

W

DC Output Current

20

mA

RANGE

AMBIENT

TEMPERATURE

Vcc

Commercial

Industrial

TRUTH TABLE

PIN DESCRIPTIONS

Name

Function

A0-A16 Address Input

These 17 address inputs select one of the 131,072 x 8-bit words in the RAM

CE1 Chip Enable 1 Input

CE2 Chip Enable 2 Input

CE1 is active LOW and CE2 is active HIGH. Both chip enables must be active when

data read from or write to the device. If either 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

MODE

WE

CE1

CE2

OE

I/O OPERATION

Vcc CURRENT

XH

X

X

Not selected

(Power Down)

XX

L

X

High Z

Output Disabled

H

L

H

H

High Z

Read

H

L

H

L

Write

L

L

H

X