Home > Integrated Circuits ICs > SN74LVC1G123DBVR

SN74LVC1G123DBVR

Single retriggerable monostable multivibrator, Schmitt-trigger, SOT-23-8

15000

Effective Inventory

Go to Inquiry

Image for reference only

Manufacturer Part：

SN74LVC1G123DBVR

Package：

SOT-23-8 (2.9 x 1.6 x 1.45 mm)

Brand：

Product Categories：

Integrated Circuits ICs, Video ICs

Other recommendations you may be interested in.

SII9396SCNUC-BAR

IS43TR16256BL-125KBLI

Description

Product Overview

The SN74LVC1G123DBVR from Texas Instruments is a single retriggerable monostable multivibrator with Schmitt-trigger inputs, 1.65V-5.5V operation, and programmable pulse width in SOT-23-8 package.

Key Specifications

Channels	1
Supply Voltage	1.65 V to 5.5 V
Propagation Delay (tpd)	8 ns max @ 3.3V
Output Drive Current	32 mA (sink/source)
Input Type	Schmitt-Trigger on A-bar and B
Output Type	Push-Pull (Q and Q-bar)
Supply Current (ICC)	20 uA max
Trigger Modes	Rising edge on B, falling edge on A-bar, or CLR high
Retriggerable	Yes (up to 100% duty cycle)
Overriding Clear	Yes (active low CLR terminates pulse)
IOff Support	Yes (partial power-down, live insertion)
Package	SOT-23-8 (DBV suffix)
Operating Temperature	-40 to +125 C

Features

Schmitt-trigger inputs for slow edge tolerance
Three trigger methods: A-bar low + B rising, B high + A-bar falling, CLR high
Retriggerable for long pulses up to 100% duty cycle
Overriding clear terminates output pulse immediately
Glitch-free power-up reset on outputs

Applications

Pulse generation and timing delay circuits
Debounce and one-shot pulse conditioning
Frequency divider and missing pulse detector
AV receivers and Blu-ray player timing
Industrial control sequential timing

Product Introduction:SN74LVC1G123DBVR Product Introduction

The SN74LVC1G123DBVR from Texas Instruments is a single retriggerable monostable multivibrator with Schmitt-trigger inputs in SOT-23-8 package. The device operates from 1.65V to 5.5V supply and provides programmable output pulse duration via external resistor (REXT) and capacitor (CEXT). Three trigger methods are supported: A-bar low with B rising edge, B high with A-bar falling edge, or CLR going high. The Schmitt-trigger inputs handle slow input transition rates without jitter. The retriggerable feature allows extending the output pulse up to 100% duty cycle. The overriding clear (CLR) input can terminate the output pulse at any time. The DBVR suffix denotes SOT-23-8 package with tape and reel packaging.

Working Principle:SN74LVC1G123DBVR Working Principle

The SN74LVC1G123DBVR operates as a retriggerable monostable (one-shot) multivibrator. (1) In the quiescent state, the Q output is low and Q-bar is high. When a valid trigger event occurs (rising edge on B with A-bar low, or falling edge on A-bar with B high), the output Q goes high for a duration determined by the external timing components. The pulse width is approximately tw = REXT x CEXT x 0.33 (typical). The external capacitor connects between Cext and Rext/Cext pins, and the external resistor connects between Rext/Cext and VCC. (2) The retriggerable feature means that if a new trigger event occurs while the output pulse is still active, the pulse duration is extended from the new trigger point. This allows achieving very long output pulses or even 100% duty cycle by continuously retriggering before the pulse expires. Conversely, taking CLR low immediately terminates the output pulse regardless of the timing, providing an overriding reset function. (3) The Schmitt-trigger inputs on A-bar and B provide hysteresis that eliminates output jitter caused by slow or noisy input edges. This is critical in applications where the trigger signal comes from a mechanical switch (with contact bounce) or a slowly rising signal from an RC network. The IOff circuitry ensures the outputs are high-impedance when VCC is 0V, preventing back-drive damage in hot-swap or partial-power-down applications.

Pin Description:SN74LVC1G123DBVR Pin Definition and Functions

Pin	Name	Function
1	A-bar	Active-low trigger input (Schmitt)
2	B	Active-high trigger input (Schmitt)
3	CLR-bar	Active-low clear (overrides pulse)
4	GND	Ground
5	Q-bar	Complementary output
6	Q	Normal output (pulse high)
7	Cext	External capacitor (positive terminal)
8	Rext/Cext	External resistor/capacitor junction

Application Scenarios:In which products and applications isSN74LVC1G123DBVR used

Pulse generation and timing delay circuits with programmable width via REXT/CEXT
Switch debounce and one-shot pulse conditioning with Schmitt-trigger inputs
Frequency divider and missing pulse detector using retriggerable feature
AV receivers and Blu-ray player timing control
Industrial control sequential timing and watchdog pulse generation

Alternative Models:What chips are recommended as replacements for SN74LVC1G123DBVR

Model	Manufacturer	Key Difference
74LVC1G123DC-Q100	Nexperia	AEC-Q100, VSSOP-8
SN74LVC1G123DCTR	TI	Same, SSOP-8 package
74LVC1G123GW	Nexperia	SOT-353-5, smaller package
CD74HC4538EE4	TI	Dual monostable, DIP-16
74HC123D	Nexperia	Dual monostable, SO-16