Description
The DM54 74121 is a monostable multivibrator featuring both positive and negative edge triggering with plementary outputs An internal 2kX timing resistor is provided for design convenience minimizing ponent count and layout problems This device can be used with a single external capacitor Inputs (A) are active-low trigger transition inputs and input (B) is an 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 VCC noise 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 NSC one-shot application notes carefully and observe remendations Y Y Y Y Y Y Y Jitter free Schmitt-trigger input Excellent noise immunity typically 1 2V Stable pulse width up to 90% duty cycle TTL DTL compatible pensated for VCC and temperature variations Input clamp diodes Alternate Military Aerospace device (54121) is available Contact a National Semiconductor Sales Office Distributor for specifications.
