1. General description

The 74LVC1G123 is a single retriggerable monostable multivibrator with Schmitt trigger inputs.

Output pulse width is controlled by three methods:

1. The basic pulse is programmed by selection of an external resistor (REXT) and capacitor (CEXT).

2. Once triggered, the basic output pulse width may be extended by retriggering the gated active

LOW-going edge input (A) or the active HIGH-going edge input (B). By repeating this process,

the output pulse period (Q = HIGH) can be made as long as desired. Alternatively an output

delay can be terminated at any time by a LOW-going edge on input CLR, which also inhibits the

triggering.

3. An internal connection from CLR to the input gates makes it possible to trigger the circuit by a

HIGH-going signal at input CLR.

Inputs can be driven from either 3.3 V or 5 V devices. This feature allows the use of these devices

as translators in a mixed 3.3 V and 5 V environment. Schmitt trigger inputs, makes the circuit highly

tolerant to slower input rise and fall times.

This device is fully specified for partial power-down applications using IOFF. The IOFF circuitry

disables the output, preventing the damaging backflow current through the device when it is

powered down.

2. Features and benefits

• Wide supply voltage range from 1.65 V to 5.5 V

• High noise immunity

• ±24 mA output drive (VCC = 3.0 V)

• CMOS low power consumption

• DC triggered from active HIGH or active LOW inputs

• Retriggerable for very long pulses up to 100 duty factor

• Direct reset terminates output pulse

• Schmitt trigger on all inputs

• Complies with JEDEC standard:

• JESD8-7 (1.65 V to 1.95 V)

• JESD8-5 (2.3 V to 2.7 V)

• JESD8-B/JESD36 (2.7 V to 3.6 V)

• Power-on-reset on outputs

• Latch-up performance exceeds 100 mA

• Direct interface with TTL levels

• Inputs accept voltages up to 5.5 V

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

• CDM JESD22-C101E exceeds 1000 V

• Multiple package options

• Specified from -40 °C to +85 °C and -40 °C to +125 °C

74LVC1G123属于集成电路（IC） > 多谐振荡器。安世半导体(中国)有限公司制造生产的74LVC1G123多谐振荡器多谐振荡器是简单的双态器件，尽管它们的典型使用方式在很大程度上具有模拟特性，但通常被认为是数字逻辑元器件。单稳型也称为“单发”，具有一种稳定状态；但施加触发信号可使它们离开此状态一段时间，该时间通常由所连接电容器的值来确定。这些器件对于去弹跳开关触头等应用非常有用。非稳型没有稳定状态，在两个状态之间按一定频率持续转换，该频率通常也是由所连接电容器的值来确定。