7272-112912-2

 

NOTE: LS7272-20 does not have OPD pin.

INPUT / OUTPUT DESCRIPTION:

A / B / C / D

AO / BO / CO / DO / AO / BO / CO / DO

These outputs can be selected to be push-pull or open-drain using the OPD input pin (LS7272 only). When in push-pull mode, outputs switch

ENA

A logic low on this CMOS / TTL compatible input enables the output drivers while logic high forces them into a high-impedance state. This input is

also used to enable / disable the output short circuit thermal protection.

Applying a voltage between 7.5V and 12.5V to the ENA input will disable the thermal shutdown protection function. When using this feature, the Line

Driver Outputs are enabled but no longer protected.

OPD (LS7272 only)

A logic low on this connects the outputs as open-drain drivers. If this input is left floating, the outputs are connected as push-pull drivers.

LOW (LS7273 only)

This pin must be tied low.

1

4

5

7

8

2

3

6

A

AO

AO

n.c.

BO

BO

n.c.

20

19

18

17

16

15

14

13

VDD

D

DO

CO

ENA

DO

CO

C

10

9

12

11

VSS

B

n.c.

VSS

n.c.

1

4

5

7

8

2

3

6

A

AO

AO

n.c.

BO

BO

n.c.

20

19

18

17

16

15

14

13

VDD

D

DO

CO

ENA

DO

CO

C

10

9

12

11

VSS

B

n.c.

VSS

n.c.

FIGURE 3

FIGURE 4