Nexperia 74LV123BQ,115

The 74LV123 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(overline) or nB). By repeating this process, the output pulse period (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. Control inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess V_CC. Schmitt-trigger action at nA(overline) and nB inputs makes the circuit tolerant of slower input rise and fall times.

• Wide supply voltage range from 1.0 V to 5.5 V
• CMOS low power dissipation
• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
• Optimized for low-voltage applications: 1.0 V to 3.6 V
• Accepts TTL input levels between V_CC = 2.7 V and V_CC = 3.6 V
• Typical output ground bounce: < 0.8 V at V_CC = 3.3 V and T_amb = 25 °C
• Typical HIGH-level output voltage (V_0H) undershoot: > 2 V at V_CC = 3.3 V and T_amb = 25 °C
• DC triggered from active HIGH or active LOW inputs
• Retriggerable for very long pulses up to 100 % duty factor
• Direct reset terminates output pulses
• Schmitt-trigger action on all inputs except for the reset input
• Complies with JEDEC standards:
  • JESD8-7 (1.65 V to 1.95 V)
  • JESD8-5 (2.3 V to 2.7 V)
  • JESD8C (2.7 V to 3.6 V)
  • JESD36 (4.5 V to 5.5 V)
• 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

• Timing control circuits
• Pulse width modulation
• Low-voltage applications
• TTL input level compatible
• Signal delay and timing
• Output pulse stretching
• Retriggerable monostable multivibrator
• Direct reset function
• Schmitt trigger input
• Low-power design
• High-temperature operating environment
• Timing and control in electronic systems