Rev.2.00, Feb.18.2005, page 1 of 8

HD74LS123

Dual Retriggerable Monostable Multivibrators (with Clear)

REJ03D0429–0200

Rev.2.00

Feb.18.2005

This d-c triggered multivibrator features output pulse width control by three method. The basic pulse time is

programmed by selection of external resistance and capacitance values. Once triggered, the basic pulse width may be

extended by retriggering the gated low-level -active (A) or high-level active (B) inputs, or be reduced by use of the

overriding clear. Figure 1 illustrates pulse control by retriggering and early clear. This device is provided enough

Schmitt hysteresis to ensure jitter-free triggering from the B input with transition rates as slow as 0.1 mV/ns.

Features

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74LS123P

DILP-16 pin

PRDP0016AE-B

(DP-16FV)

P

—

HD74LS123FPEL

SOP-16 pin (JEITA)

PRSP0016DH-B

(FP-16DAV)

FP

EL (2,000 pcs/reel)

HD74LS123RPEL

SOP-16 pin (JEDEC)

PRSP0016DG-A

(FP-16DNV)

RP

EL (2,500 pcs/reel)

Note:

Please consult the sales office for the above package availability.

A = "L"

A = "L"

Clear = "H"

B

Retrigger Pulse

Output without

retrigger

Output without

clear

"L"

"H"

"H"

"L"

"L"

"L"

"H"

"H"

"H"

"L"

Q

B

Clear

Q

Figure 1

Typical Input / Output Pulse