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74LS121 Datasheet Monostable Multivibrator Featuring Both Positive And Negative Edge Triggering

Manufacturer: National

Overview: 54121 DM54121 DM74121 One-Shot with Clear and Complementary Outputs June 1989 54121 DM54121 DM74121 One-Shot with Clear and Complementary.

Datasheet Details

Part number 74LS121
Manufacturer National
File Size 164.41 KB
Description monostable multivibrator featuring both positive and negative edge triggering
Datasheet 74LS121_National.pdf

General Description

The DM54 74121 is a monostable multivibrator featuring both positive and negative edge triggering with complementary outputs An internal 2kX timing resistor is provided for design convenience minimizing component 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 recommendations 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 Compensated for VCC and temperature variations Input clamp diodes Alternate Military Aerospace device (54121) is available Contact a National Semiconductor Sales Office Distributor for specifications Functional Description

Key Features

  • Y Y Triggered from active-high transition or active-low transition inputs Variable pulse width from 30 ns to 28 seconds The basic output pulse width is determined by selection of an internal resistor RINT or an external resistor (RX) and capacitor (CX) Once triggered the output pulse width is independent of further transitions of the inputs and is a function of the timing components Pulse width can vary from a few nano-seconds to 28 seconds by choosing appropriate RX and CX combinations There.

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