CD74FCT646

BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER

WITH 3-STATE OUTPUTS

SCBS735A – JULY 2000 – REVISED JULY 2000

6

POST OFFICE BOX 655303

timing requirements over recommended operating temperature conditions (unless otherwise

noted) (see Figure 2)

MIN

MAX

UNIT

fclock

Clock frequency

85

MHz

tw

Pulse duration

CLKBA or CLKAB high or low

6

ns

tsu

Setup time

A before CLKAB

↑ or B before CLKBA↑

4

ns

th

Hold time

A after CLKAB

↑ or B after CLKBA↑

2

ns

switching characteristics over recommended operating temperature conditions (unless otherwise

noted) (see Figure 2)

PARAMETER

FROM

TO

TA = 25°C

MIN

MAX

UNIT

PARAMETER

(INPUT)

(OUTPUT)

TYP

MIN

MAX

UNIT

fmax

85

MHz

CLKBA or CLKAB

A or B

6.8

2

9

tpd

A or B

B or A

6.8

2

9

ns

SBA or SAB†

A or B

8.3

2

11

ten

OE

A or B

10.5

2

14

ns

tdis

OE

A or B

6.8

2

9

ns

† These parameters are measured with the internal output state of the storage register opposite that of the bus input.

PARAMETER

MIN

TYP

MAX

UNIT

VOL(P)

Quiet output, maximum dynamic VOL

1

V

VOH(V)

Quiet output, minimum dynamic VOH

0.5

V

VIH(D)

High-level dynamic input voltage

2

V

VIL(D)

Low-level dynamic input voltage

0.8

V