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DM74121N データシート(PDF) 1 Page - Fairchild Semiconductor |
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DM74121N データシート(HTML) 1 Page - Fairchild Semiconductor |
1 / 5 page © 2001 Fairchild Semiconductor Corporation DS006538 www.fairchildsemi.com June 1989 Revised July 2001 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 2k Ω timing resistor is provided for design convenience minimizing component count and lay- out problems. this device can be used with a single exter- nal capacitor. Inputs (A) are active-LOW trigger transition inputs and input (B) is and 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 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: Connection Diagram Function Table H = HIGH Logic Level ↑ = Positive Going Transition L = LOW Logic Level ↓ = Negative Going Transition 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 func- tion of the timing components. Pulse width can vary from a few nano-seconds to 28 seconds by choosing appropriate RX and CX combinations. There are three trigger inputs from the device, two negative edge-triggering (A) inputs, one positive edge Schmitt-triggering (B) input. Order Number Package Number Package Description DM74121N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Inputs Outputs A1 A2 B Q Q LX H L H XL H L H XX L L H HH X L H H ↓ H ↓ HH ↓↓ H LX ↑ XL ↑ |
同様の部品番号 - DM74121N |
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同様の説明 - DM74121N |
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