74HC221D Dual Monostable Multivibrator IC’s

The 74HCT221 is a dual non-re triggerable monostable multivibrator. Each multivibrator features edge-triggered inputs (nA and nB), either of which can be used as an enable input. Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. Schmitt-trigger input circuitry for the nB inputs allow jitter-free triggering from inputs with slow transition rates, providing the circuit with excellent noise immunity. Once triggered, the outputs (nQ, nQ) are independent of further transitions of nA and nB inputs. The output pulse width is defined by the following relationship: tW = 0.7  CEXT  REXT The output pulses can be terminated by the active LOW reset inputs (nRD). Pulse width stability is achieved through internal compensation and is virtually independent of VCC and temperature. In most applications pulse stability will only be limited by the accuracy of the external timing components. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features:

1. Dual, Highly Stable One-Shot
2. Large Quantity Discounts
3. Direct Reset Terminated Output Pulse
4. Standard TTL Switching Voltages
5. Input levels:
6. For 74HCT221: TTL level
7. Pulse width variance is typically less than 5%
8. Direct reset terminates output pulse
9. Schmitt-trigger action on nB inputs
10. ESD protection:
11. HBM JESD22-A114F exceeds 2000 V
12. MM JESD22-A115-A exceeds 200 V
13. Specified from 40 C to +85 C and from 40 C to +125 C

Packing List:

• 1pcs x 74HC221D Dual Monostable Multivibrator IC’s