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74HC221 IC – (SMD Package) – Dual Non-Retriggerable Monostable Multivibrator with Reset IC (74221 IC)

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The 74HC221A high speed monostable multivibrators (one shots) utilize advanced silicon-gate CMOS technology. They feature speeds comparable to low power Schottky TTL circuitry while retaining the low power and high noise immunity characteristic of CMOS circuits. Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken low resets the one shot. The 74HC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH. The 74HC221A is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out. Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques. The output pulse equation is simply: PW = (REXT) (CEXT); where PW is in seconds, R is in ohms, and C is in farads. All inputs are protected from damage due to static discharge by diodes to VCC and ground.


  • Typical propagation delay: 40 ns
  • Wide power supply range: 2V–6V
  • Low quiescent current: 80 µA maximum (74HC Series)
  • Low input current: 1 µA maximum
  • Fanout of 10 LS-TTL loads
  • Simple pulse width formula T = RC
  • Wide pulse range: 400 ns to ∞ (typ)
  • Part to part variation: ±5% (typ)
  • Schmitt Trigger A & B inputs enable infinite signal input rise or fall times


Symbol Parameter Value Unit
VCC Supply Voltage − 0.5 to + 7.0V V
VIN DC Input Voltage  − 1.5 to VCC + 1.5V V
VOUT DC Output Voltage − 0.5 to VCC + 0.5V V
IIK, IOK Clamp Diode Current ± 20 mA
IOUT DC Output Current, per pin ± 25 mA
ICC DC VCC or GND Current, per pin ± 50 mA
TSTG Storage Temperature Range − 65°C to + 150 °C
PD Power Dissipation 500  mW
TL Lead Temperature 260 °C


* product image for illustration purposes only. actual product may vary.


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