Nexperia 74AHCT123ABQ,115

The 74AHC123A; 74AHCT123A is a dual retriggerable monostable multivibrator with reset. The basic output pulse width is programmed by selection of external components (R_EXT and C_EXT). 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 (Δ·nQ = HIGH, nQ(overline) = 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.

• 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
• Latch - up performance exceeds 100 mA per JESD 78 Class II Level A
• ESD protection: HBM: ANSI/ESDA/JEDEC JS - 001 class 2 exceeds 2000 V CDM: ANSI/ESDA/JEDEC JS - 002 class C3 exceeds 1000 V
• Multiple package options
• Specified from - 40 °C to + 85 °C and from - 40 °C to + 125 °C

• Level shifting in mixed-voltage environments