SN54LV123A, SN74LV123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

WITH SCHMITT TRIGGER INPUTS

SCLS393O − APRIL 1998 − REVISED OCTOBER 2005

1

POST OFFICE BOX 655303

All Ports

Inputs for Slow Input Transition Rates

Active-Low Gated Logic Inputs

Operation

up to 100% Duty Cycle

JESD 78, Class II

− 2000-V Human-Body Model (A114-A)

− 200-V Machine Model (A115-A)

− 1000-V Charged-Device Model (C101)

SN54LV123A ...J OR W PACKAGE

SN74LV123A . . . D, DB, DGV, NS,

OR PW PACKAGE

(TOP VIEW)

SN54LV123A . . . FK PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1A

1B

1CLR

1Q

2Q

GND

1Q

2Q

2CLR

2B

2A

32

1 20 19

910 11 1213

4

5

6

7

8

18

17

16

15

14

1Q

NC

2Q

2CLR

1CLR

1Q

NC

2Q

NC − No internal connection

SN74LV123A . . . RGY PACKAGE

(TOP VIEW)

116

89

2

3

4

5

6

7

15

14

13

12

11

10

1Q

2Q

2CLR

2B

1B

1CLR

1Q

2Q

description/ordering information

These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method,

the A input is low and the B input goes high. In the second method, the B input is high and the A input goes low.

In the third method, the A input is low, the B input is high, and the clear (CLR) input goes high.

The output pulse duration is programmable by selecting external resistance and capacitance values. The

Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input

pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition

rates with jitter-free triggering at the outputs.

Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or

high-level-active (B) input. Pulse duration can be reduced by taking CLR low. The input/output timing diagram

illustrates pulse control by retriggering the inputs and early clearing.

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 2005, Texas Instruments Incorporated

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UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information 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.