SN74LV8154

DUAL 16BIT BINARY COUNTERS

WITH 3STATE OUTPUT REGISTERS

SCLS589 − AUGUST 2004

2

POST OFFICE BOX 655303

FUNCTION TABLE

(each buffer)

INPUTS

OUTPUT

GAL

GAU

GBL

GBU

OUTPUT

Yn

L

H

H

H

Lower byte in A register

H

L

H

H

Upper byte in A register

H

H

L

H

Lower byte in B register

H

H

H

L

Upper byte in B register

H

H

H

H

Z

Combinations of GAL, GAU, GBL, GBU, other than those shown above, are

prohibited. If more than one input is L at the same time, the output data (Y0−Y7) may

be invalid.

timing diagram

0000

0001

0002

0003

0004

0100

0101

0102

0103

FFFD FFFE

FFFF

0000

0001

0000

0001

0002

0003

0004

0100

0101

0102

FFFD FFFE

FFFF

0000

0001

Don’t Care

00

01

02

03

00

FF

01

CCKBEN

CCLR

CCKA

CCKB

RCLK

A

Counter

B

Counter

GAL

GAU

GBL

GBU

Output

RCOA