General Description

The DM74121 is a monostable multivibrator featuring both positive and negative edge triggering with complementary outputs. An internal 2k?timing resistor is provided for design convenience minimizing component count and layout problems. this device can be used with a single exter

nal capacitor. Inputs (A) are active-LOW trigger transition inputs and input (B) is and active-HIGH transition Schmitt trigger input that allows jitter-free triggering from inputs with transition rates as slow as 1 volt/second. A high immunity to VCCnoise of typically 1.5V is also provided by internal

circuitry at the input stage.To obtain optimum and trouble free operation please read operating rules and one-shot application notes carefully and observe recommendations.

特性 Features

■ Triggered from active-HIGH transition or active-LOW transition inputs

■ Variable pulse width from 30 ns to 28 seconds

■ Jitter free Schmitt-trigger input

■ Excellent noise immunity typically 1.2V

■ Stable pulse width up to 90 duty cycle

■ TTL, DTL compatible

■ Compensated for VCCand temperature variations

■ Input clamp diodes