SN54ALS880A, SN54AS880, SN74ALS880A, SN74AS880

DUAL 4BIT DTYPE LATCHES WITH 3STATE OUTPUTS

SDAS079A − D2661, DECEMBER 1982 − REVISED MAY 1986

POST OFFICE BOX 655303

POST OFFICE BOX 1443

Copyright

1

Lines Directly

Noninverting Outputs

Outline Packages, Both Plastic and

Ceramic Chip Carriers, and Standard

Plastic and Ceramic 300-mil DIPs

Reliability

description

These dual 4-bit registers feature 3-state outputs

designed specifically for bus driving. This makes

these devices particularly suitable for implement-

ing buffer registers, I/O ports, bidirectional bus

drivers, and working registers.

The dual 4-bit latches are transparent D-type.

When the latch enable input (1C or 2C) is high, the

Q outputs will follow the data (D) inputs in inverted

form, according to the function table. When the

latch enable input is taken low, the outputs will be

latched. When PRE goes low, the Q outputs go low

independently of the clock. The outputs are in a

high-impedance state when OC (output control) is

at a high logic level.

The SN54ALS880A and SN54AS880 are charac-

terized for operation over the full military

temperature range of − 55

°C to 125°C. The

SN74ALS880A and SN74AS880 are character-

ized for operation from 0

°C to 70°C.

FUNCTION TABLE

(each latch)

INPUTS

OUTPUT

OC

PRE

C

D

Q

L

L

X

X

L

L

HH

H

L

L

HH

L

H

L

HL

X

Q0

H

X

X

X

Z

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

1PRE

1OC

1D1

1D2

1D3

1D4

2D1

2D2

2D3

2D4

2OC

GND

1C

1Q1

1Q2

1Q3

1Q4

2Q1

2Q2

2Q3

2Q4

2C

2PRE

SN54ALS880A, SN54AS880 . . . JT PACKAGE

SN74ALS880A, SN74AS880 . . . DW OR NT PACKAGE

(TOP VIEW)

32 1

13 14

5

6

7

8

9

10

11

1Q2

1Q3

1Q4

NC

2Q1

2Q2

2Q3

1D2

1D3

1D4

NC

2D1

2D2

2D3

4

15 16 17 18

SN54ALS880A, SN54AS880 . . . JT PACKAGE

SN74ALS880A, SN74AS880 . . . DW OR NT PACKAGE

(TOP VIEW)

28 27 26

25

24

23

22

21

20

19

12

NC − No internal connection

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.