TEXAS INSTRUMENTS SN54ALS841 Technical data

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SN54ALS841, SN54AS841, SN54ALS842, SN54AS842 SN74ALS841, SN74AS841, SN74ALS842, SN74AS842

10-BIT BUS INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS

SDAS059B – D2910, DECEMBER 1983 – REVISED MAY 1986

• 3-State Buffer-Type Outputs Drive

Bus-Lines Directly

• Bus-Structured Pinout

• Provide Extra Bus Driving Latches

Necessary for Wider Address/Data Paths or Buses with Parity

• Buffered Control Inputs to Reduce DC

Loading

• Power-Up High-Impedance State

• Package Options Include Plastic Small

Outline Packages, Both Plastic and Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs

• Dependable Texas Instruments Quality and

Reliability

description

These 10-bit latches feature 3-state outputs designed specifically for driving highly-capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The ten latches are transparent D-type. The ’ALS841 and ’AS841 have noninverting data (D) inputs. The ’ALS842 and ’AS842 have inverting D

SN54ALS841, SN54AS841 . . . JT PACKAGE

SN74ALS841, SN74AS841 . . . DW OR NT PACKAGE

(TOP VIEW)

OC

1

24

1D

2

23

2D

3

22

3D

4

21

4D

5

20

5D

6

19

6D

7

18

7D

8

17

8D

9

16

9D

10

15

10D

11

14

GND

SN54ALS842, SN54AS842 . . . JT PACKAGE

SN74ALS842, SN74AS842 . . . DW OR NT PACKAGE

12

13

(TOP VIEW)

V

CC

1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q 9Q 10Q C

inputs.

SN54ALS841, SN54AS841 . . . FK PACKAGE SN74ALS841, SN74AS841 . . . FN PACKAGE

(TOP VIEW)

CC

V

1Q

2D1DOC

4

5

3D

6

4D

7

5D

8

NC

9

6D

10

7D

11

8D

12

13 14

9D

SN54ALS842, SN54AS842 . . . FK PACKAGE SN74ALS842, SN74AS842 . . . FN PACKAGE

NC

321

10D

(TOP VIEW)

28 27 26

15 16 17 18

NC

GND

2Q

25

3Q 4Q

24

5Q

23

NC

22

6Q

21

7Q

20

8Q

19

C

9Q

10Q

OC

1

24

1D

2

23

2D

3

22

3D

4

21

4D

5

20

5D

6

19

6D

7

18

7D

8

17

8D

9

16

9D

10

15

10D

11

14

GND

PRODUCTION DATA information is current as of publication date.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments

Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include

standard warranty. Production processing does not necessarily include testing of all parameters.

testing of all parameters.

12

13

V

CC

1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q 9Q 10Q C

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3D 4D 5D

NC

6D 7D 8D

CC

1Q

2D1DOC

4

5 6 7 8 9

10

11

13 14

12

9D

Copyright  1986, Texas Instruments Incorporated

321

15 16 17 18

10D

GND

NC

28 27 26

NC

2Q

V

25

3Q 4Q

24

5Q

23

NC

22

6Q

21

7Q

20

8Q

19

C

9Q

10Q

5BASIC

1

SN54ALS841, SN54AS841, SN54ALS842, SN54AS842 SN74ALS841, SN74AS841, SN74ALS842, SN74AS842 10-BIT BUS INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS

SDAS059B – D2910, DECEMBER 1983 – REVISED MAY 1986

description (continued)

A buffered output control (OC) input can be used to place the ten outputs in either a normal logic state (high or low levels) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive the bus lines in a bus-organized system without need for interface or pullup components.

The output control does not affect the internal operation of the latches. Old data can be retained or new data can be entered while the outputs are off.

The -1 versions of the SN74ALS841 and SN74ALS842 parts are identical to the standard versions except that the recommended maximum I SN54ALS842.

The SN54ALS841, SN54AS841, SN54ALS842, and SN54AS842 are characterized for operation over the full military temperature range of –55°C to 125°C. The SN74ALS841, SN74AS841, SN74ALS842, and SN74AS842 are characterized for operation from 0°C to 70°C.

’ALS841, ’AS841 ’ALS842, ’AS842

OC CD Q

LHH H LHL L LLX Q HXX Z

is increased to 48 mA. There are no -1 versions of the SN54ALS841 and

OL

Function Tables

INPUTS OUTPUTINPUTS OUTPUT

OC CD Q

LHH L LHL H

0

LLX Q

HXX Z

0

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54ALS841, SN54AS841, SN74ALS841, SN74AS841

10-BIT BUS INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS

SDAS059B – D2910, DECEMBER 1983 – REVISED MAY 1986

23 22 21

20 19

18 17 16 15 14

†

1Q 2Q 3Q

4Q 5Q

6Q 7Q 8Q 9Q 10Q

’ALS841, ’AS841 logic symbol

1

OC

C

1D 2D 3D

4D 5D

6D 7D 8D 9D

10D

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and EC Publication 617-12.

13

2 3 4

5 6

7 8 9 10 11

EN C1

1D

’ALS841, ’AS841 logic diagram (positive logic)

1

OC

13

C

2

1D

3

2D

4

3D

5

4D

6

5D

7

6D

C1 1D

23

22

21

20

19

18

1Q

2Q

3Q

4Q

5Q

6Q

Pin numbers shown are for DW, JT, and NT packages.

7D

8D

9D

10D

8

9

10

11

C1 1D

17

16

15

14

7Q

8Q

9Q

10Q

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

SN54ALS841, SN54AS841, SN54ALS842, SN54AS842 SN74ALS841, SN74AS841, SN74ALS842, SN74AS842 10-BIT BUS INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS

SDAS059B – D2910, DECEMBER 1983 – REVISED MAY 1986

23 22 21

20 19

18 17 16 15

†

1Q 2Q 3Q

4Q 5Q

6Q 7Q 8Q 9Q 10Q

’ALS842, ’AS842 logic symbol

1

OC

C

1D 2D 3D

4D 5D

6D 7D 8D 9D

10D

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

EN

13

C1

2

1D

3 4

5 6

7 8 9 10 11 14

’ALS842, ’AS842 logic diagram (positive logic)

1

OC

13

C

2

1D

3

2D

4

3D

5

4D

6

5D

7

6D

C1 1D

23

22

21

20

19

18

1Q

2Q

3Q

4Q

5Q

6Q

Pin numbers shown are for DW, JT, and NT packages.

7D

8D

9D

10D

8

9

10

11

C1 1D

17

16

15

14

7Q

8Q

9Q

10Q

absolute maximum ratings over operating free-air temperature range unless otherwise noted

Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range:

SN54ALS841, SN54AS841, SN54ALS842, SN54AS842 –55°C to 125°C. . . . . .

SN74ALS841, SN74AS841, SN74ALS842, SN74AS842 0°C to 70°C. . . . . . . . . .

Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265