1. General description

The 74AHC123A; 74AHCT123A is a dual retriggerable monostable multivibrator with reset. The

basic output pulse width is programmed by selection of external components (REXT and CEXT).

Once triggered this basic pulse width may be extended by retriggering either of the edge triggered

inputs (nA or (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW)

can be made as long as desired. Alternatively, an output delay can be terminated at any time by

a LOW-going edge on input nRD. Inputs are overvoltage tolerant. This feature allows the use of

these devices as translators in mixed voltage environments.

2. Features and benefits

• Wide supply voltage range from 2.0 V to 5.5 V

• DC triggered from active HIGH or active LOW inputs

• Retriggerable for very long pulses up to 100 duty factor

• Direct reset terminates output pulse

• Overvoltage tolerant inputs to 5.5 V

• All inputs have a Schmitt-trigger action

• High noise immunity

• Input levels:

• For 74AHC123A: CMOS level

• For 74AHCT123A: TTL level

• ESD protection:

• HBM JESD22-A114E exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

• CDM JESD22-C101C exceeds 1000 V

• Latch-up performance exceeds 100 mA per JESD 78 Class II Level A

• Multiple package options

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

74AHC123ABQ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74AHC123ABQ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。