SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS278 – JANUARY 1995

5

POST OFFICE BOX 655303

switching characteristics (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500

R2 = 500

TA = MIN to MAX†

UNIT

SN54AS645

SN74AS645

MIN

MAX

MIN

MAX

tPLH

AorB

BorA

2

11

2

9.5

ns

tPHL

A or B

B or A

2

10.5

2

9

ns

tPZH

OE

AorB

2

12

2

11

ns

tPZL

OE

A or B

2

12

2

10

ns

tPHZ

OE

AorB

2

8

2

7

ns

tPLZ

OE

A or B

2

13

2

12

ns

† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.