R0201-BS616UV2011

Revision 2.5

April 2002

2

Name

Function

A0-A16 Address Input

These 17 address inputs select one of the 131,072 x 16-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.

LB and UB Data Byte Control Input

Lower byte and upper byte data input/output control pins.

Input/Output

These 16 bi-directional ports are used to read data from or write data into the RAM.

DQ0 - DQ15 Data

Ports

Vcc

Power Supply

Gnd

Ground

TRUTH TABLE

PIN DESCRIPTIONS

BSI

BS616UV2011

MODE

CE

WE

OE

LB

UB

DQ0~DQ7

DQ8~DQ15

Vcc CURRENT

Not selected

(Power Down)

H

X

X

X

X

High Z

High Z

Output Disabled

L

H

H

X

X

High Z

High Z

L

L

Dout

Dout

H

L

High Z

Dout

Read

L

H

L

L

H

Dout

High Z

L

L

Din

Din

H

L

X

Din

Write

L

L

X

L

H

Din

X