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74121

Fairchild Semiconductor
Part Number 74121
Manufacturer Fairchild Semiconductor
Description Monostable multivibrator
Published Apr 3, 2005
Detailed Description DM74121 One-Shot with Clear and Complementary Outputs June 1989 Revised November 1999 DM74121 One-Shot with Clear and ...
Datasheet PDF File 74121 PDF File

74121
74121

Overview
DM74121 One-Shot with Clear and Complementary Outputs June 1989 Revised November 1999 DM74121 One-Shot with Clear and Complementary Outputs General Description 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.
Features 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 Description 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 Description 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 Going Transition...


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