DESCRIPTION

· The M74HC221 is a high-speed CMOS monostable multivibrator fabricated with silicon gate C2MOS technology.
· It features two trigger inputs: A INPUT (negative edge) and B INPUT (positive edge).
· The device can also be triggered using the CLR input (positive edge) due to the Schmitt-trigger input.
· The output maintains the monostable state for a period determined by external resistor Rx and capacitor Cx.
· Taking CLR low breaks the monostable state.
· If a trigger pulse occurs during the monostable period, it extends the monostable period.
· All inputs are protected against static discharge and transient excess voltage.

FEATURES

· High speed: tPD = 24 ns (TYP.) at VCC = 6V.
· Low power dissipation: Standby state ICC = 4µA (MAX.) at TA = 25°C; Active state ICC = 700µA (MAX.) at VCC = 5V.
· High noise immunity: VNIH = VNIL = 28% VCC (MIN.).
· Symmetrical output impedance: |IOH| = IOL = 4mA (MIN).
· Balanced propagation delays: tPLH ≅ tPHL.
· Wide operating voltage range: VCC (OPR) = 2V to 6V.
· Wide output pulse width range: tWOUT = 150 ns ~ 60 s at VCC = 4.5V.
· Pin and function compatible with 74 series 221.

APPLICATIONS

· Suitable for applications requiring precise timing control.
· Ideal for use in digital systems where noise immunity and low power consumption are critical.
· Can be used in circuits requiring monostable multivibrator functionality with high-speed operation.
· Applicable in systems needing wide operating voltage range and symmetrical output impedance.