SN54BCT640, SN74BCT640

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCBS025C – SEPTEMBER 1988 – REVISED APRIL 1994

2–4

POST OFFICE BOX 655303

switching characteristics (see Note 2)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,

CL = 50 pF,

R1 = 500

Ω,

R2 = 500

Ω,

TA = 25°C

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500

Ω,

R2 = 500

Ω,

TA = MIN to MAX†

UNIT

′BCT640

SN54BCT640

SN74BCT640

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

AorB

BorA

0.5

3.6

5.6

0.5

7

0.5

6.5

ns

tPHL

A or B

B or A

0.5

1.9

3.4

0.5

3.8

0.5

3.7

ns

tPZH

OE

AorB

3.1

6.4

8.9

2.6

10.5

2.6

10.2

ns

tPZL

OE

A or B

4.1

6.9

9.5

3.5

12.3

3.5

10.7

ns

tPHZ

OE

AorB

1.9

5

7.9

1.4

12.2

1.4

10.2

ns

tPLZ

OE

A or B

1.8

4.3

6.8

1.5

8.3

1.5

7.8

ns

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

NOTE 2: Load circuits and voltage waveforms are shown in Section 1.