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SN74LVC1G123DCTT

TI retriggerable monostable multivibrator, 1.65-5.5V, SSOP-8, -40 to 125C

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SN74LVC1G123DCTT

Package：

SSOP-8 (DCT)

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Description

Product Overview

The SN74LVC1G123DCTT is a single retriggerable monostable multivibrator (one-shot) from Texas Instruments’ 74LVC family. Operating from 1.65V to 5.5V, this device generates precision output pulses whose width is determined by external timing components. The SSOP-8 package provides a compact solution for pulse generation, delay timing, and frequency division in mixed-voltage digital systems.

Key Specifications

Series	74LVC1G123
Type	Monostable Multivibrator (Retriggerable)
Supply Voltage	1.65V to 5.5V
Output Current	+/-24 mA
Propagation Delay	6.5 ns (typical at 5V)
Minimum Pulse Width	35 ns (at 5V)
Inputs	A (rising edge), B (falling edge), CLR (active low)
Outputs	Q, Q-bar
Package	SSOP-8 (DCT)
Operating Temperature	-40C to +125C

Features

Retriggerable monostable for flexible pulse generation
Direct clear input for pulse termination
Complementary outputs (Q and Q-bar)
Over-voltage tolerant inputs to 5.5V
Wide supply voltage range for mixed-voltage systems
Low power CMOS technology
SSOP-8 compact footprint

Applications

Pulse width generation and timing
Debounce circuits for mechanical switches
Delay generation for sequential logic
Frequency division and pulse stretching
Watchdog timer circuits

Product Introduction:SN74LVC1G123DCTT Product Introduction

The Texas Instruments SN74LVC1G123DCTT is a single retriggerable monostable multivibrator from the 74LVC logic family. Operating from 1.65V to 5.5V, it generates precision output pulses whose width is set by external resistor and capacitor timing components. The retriggerable architecture allows extending the output pulse by applying additional trigger edges during the active pulse. The direct clear (CLR) input enables immediate pulse termination. With complementary Q and Q-bar outputs and over-voltage tolerant inputs, this device is ideal for pulse generation, switch debounce, and timing applications in mixed-voltage digital systems.

Working Principle:SN74LVC1G123DCTT Working Principle

The SN74LVC1G123DCTT operates as a retriggerable one-shot multivibrator. A trigger event (rising edge on A input or falling edge on B input) starts the output pulse, which remains active for a duration determined by the external timing resistor (Rext) and capacitor (Cext): tw = 0.45 x Rext x Cext. During the active pulse, additional trigger events restart the timing period (retriggerable mode), effectively extending the output pulse width. The CLR input immediately terminates the active pulse when pulled low. The complementary outputs (Q and Q-bar) provide both active-high and active-low pulse signals. The device uses CMOS technology for low power consumption and wide supply voltage compatibility.

Pin Description:SN74LVC1G123DCTT Pin Definition and Functions

Pin	Name	Type	Function
1	A	Input	Trigger input – rising edge triggered
2	B	Input	Trigger input – falling edge triggered
3	CLR	Input	Direct clear (active low) – terminates output pulse
4	Q-bar	Output	Complementary output (inverted)
5	GND	Ground	Ground reference
6	Q	Output	Normal output (active high pulse)
7	Rext/Cext	Input	External timing resistor/capacitor connection
8	VCC	Power	Positive supply voltage (1.65-5.5V)

Application Scenarios:In which products and applications isSN74LVC1G123DCTT used

Mechanical switch debounce circuit with adjustable timeout
Pulse stretcher for short-duration signal detection
Delay element in sequential logic control
Watchdog timer with retriggerable window
Frequency divider via pulse-width modulation

Alternative Models:What chips are recommended as replacements for SN74LVC1G123DCTT

Manufacturer	Part Number	Package	Notes
TI	SN74LVC1G123DCUR	SSOP-8	Same function, different tape
TI	CD74HC123EE	DIP-16	Dual monostable, HC family
Nexperia	74LVC1G123GW	TSSOP-8	Pin-compatible alternative
ON Semi	MC74VHC1G123DTT1G	SSOP-8	Comparable monostable