74121 – One-Shot with Clear and Complementary Outputs

74121 Datasheet PDF learn more.

Part number : 74121

Functions : This is a kind of semiconductor, One-Shot with Clear and Complementary Outputs.

Pin arrangement :

Package information :

Manufacturer : Fairchild Semiconductor

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74121 Datasheet PDF

The texts in the PDF file :

DM74121 One-Shot with Clear and Complementary Outputs June 1989 Revised November 1999 DM74121 One-Shot with Clear and Complementary Outputs General


The DM74121 is a monostable multivibrator featuring both positive and negative edge triggering with complementary outputs. An internal 2kΩ 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 and active-HIGH transition Schmitttrigger 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 one-shot application notes carefully and observe recommendations.


s Triggered from active-HIGH transition or active-LOW transition inputs s Variable pulse width from 30 ns to 28 seconds s Jitter free Schmitt-trigger input s Excellent noise immunity typically 1.2V s Stable pulse width up to 90% duty cycle s TTL, DTL compatible s Compensated for VCC and temperature variations s Input clamp diodes Ordering Code: Order Number DM74121N Package Number N14A Package


14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagram Function Table Inputs A1 L X X H H ↓ ↓ L X A2 X L X H ↓ H ↓ X L B H H L X H H H ↑ ↑ Q L L L Outputs Q H H H H = HIGH Logic Level L = LOW Logic Level X = Can Be Either LOW or HIGH = A Positive Pulse = A Negative Pulse Functional


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 function of the timing components. Pulse width can vary from a ↑ = Positive [ … ]

74121 PDF File

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