SN74LV123A - Dual Retriggerable Monostable Multivibrators

The ’LV123A devices are dual retriggerable monostable multivibrators designed for 2-V to 5.5-V V_CC operation.

These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method, the A input is low, and the B input goes high. In the second method, the B input is high, and the A input goes low. In the third method, the A input is low, the B input is high, and the clear (CLR) input goes high.

The output pulse duration is programmable by selecting external resistance and capacitance values. The external timing capacitor must be connected between C_ext and R_ext/C_ext (positive) and an external resistor connected between R_ext/C_ext and V_CC. To obtain variable pulse durations, connect an external variable resistance between R_ext/C_ext and V_CC. The output pulse duration also can be reduced by taking CLR low.

• 2-V to 5.5-V V_CC Operation
• Maximum t_pd of 11 ns at 5 V
• Typical V_OLP (Output Ground Bounce)
  < 0.8 V at V_CC = 3.3 V, T_A = 25°C
• Typical V_OHV (Output V_OH Undershoot)
  > 2.3 V at V_CC = 3.3 V, T_A = 25°C
• Support Mixed-Mode Voltage Operation on
  All Ports
• Schmitt-Trigger Circuitry on A, B, and CLR Inputs
  for Slow Input Transition Rates
• Edge Triggered From Active-High or
  Active-Low Gated Logic Inputs
• I_off Supports Partial-Power-Down Mode Operation
• Retriggerable for Very Long Output Pulses,
  up to 100% Duty Cycle
• Overriding Clear Terminates Output Pulse
• Glitch-Free Power-Up Reset on Outputs
• Latch-Up Performance Exceeds 100 mA Per
  JESD 78, Class 11
• ESD Protection Exceeds JESD 22
  • 2000-V Human-Body Model (A114-A)
  • 200-V Machine Model (A115-A)
  • 1000-V Charged-Device Model (C101)