SN54F621, SN74F621

OCTAL BUS TRANSCEIVERS

WITH OPEN-COLLECTOR OUTPUTS

SDFS004B – D2932, MARCH 1987 – REVISED OCTOBER 1993

2–2

POST OFFICE BOX 655303

logic diagram (positive logic)

2

A1

B1

EN1

19

EN2

1

OEAB

2

A1

3

A2

B1

18

4

A3

5

A4

6

A5

7

A6

8

A7

9

A8

B2

17

B3

16

B5

14

B4

15

B6

13

B8

11

B7

12

OEBA

1

OEBA

OEAB

19

1

18

2

To Seven Other Channels

† This symbol is in accordance with ANSI/IEEE Std 91-1984 and

IEC Publication 617-12.

– 0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

– 1.2 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

– 30 mA to 5 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high state

– 0.5 V to 5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current into any output in the low state: SN54F621 (A1 – A8)

40 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN54F621 (B1 – B8)

96 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F621 (A1 – A8)

48 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F621 (B1 – B8)

128 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range:

SN54F621

– 55

°C to 125°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F621

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

– 65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The input-voltage ratings may be exceeded provided the input-current ratings are observed.

recommended operating conditions

SN54F621

SN74F621

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

2

2

V

VOH

High-level output voltage

5.5

5.5

V

VIL

Low-level input voltage

0.8

0.8

V

IIK

Input clamp current

–18

–18

mA

IOL

Low level output current

A1 – A8

20

24

mA

IOL

Low-level output current

B1 – B8

48

64

mA

TA

Operating free-air temperature

–55

125

0

70

°C