DM74121N Datasheet | Fairchild Semiconductor

Description The DM74121 is a monostable multivibrator featuring both positive and negative edge triggering with plementary outputs. An internal 2kΩ 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 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 remendations. 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 patible s pensated for VCC and temperature variations s Input clamp diodes Ordering Code: Order Number Package Number Package Description N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagram Function Table 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 ponents. Pulse width can vary from a Inputs A1 A2 ↓ ↓ ↓ ↓ H = HIGH Logic Level L = LOW Logic Level X = Can Be Either LOW or HIGH = A Positive Pulse = A Negative Pulse Outputs X H H H ↑ ↑ ↑ = Positive Going Transition ↓ = Negative Going Transition few nano-seconds to 28 seconds by choosing appropriate RX and CX binations. There...