May 1, 2020

DMN datasheet, circuit, data sheet, alldatasheet, Datasheet search site for Electronic Components and Semiconductors, diodes, triacs, and other. DMN One-shot With Clear And Complementary Outputs. The is a monostable multivibrator featuring both positive and negative edge triggering with. Download Fairchild Semiconductor DMN pdf datasheet file.

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Tsimshatsui, Kowloon Hong Kong Tel: Figure 5 details this characteristic. Pulse width can vary from a few nano-seconds to 28 seconds by choosing appropriate RX and CX combinations. An internal 2kX timing resistor is provided for design convenience minimizing component count and layout problems. A high immunity to VCC noise of typically 1. If the timing capacitors have leakages approaching nA or if stray capacitance from either terminal to ground is greater than 50 pF the timing equations may not represent the pulse width the device generates.

If the lead length from CX to pins 10 and 11 is greater than 3 cm, for example, the output pulse width might be quite different from values predicted from the appropriate equations. This device can be dmm74121n with a single external capacitor. The value of CX may vary from 0 to any necessary value.

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Supply Voltage 7V Input Voltage 5. Figure 4 depicts pulse width variation versus ambient temperature. To obtain optimum and trouble free operation please read operating rules and NSC one-shot application notes carefully and observe recommendations. For large time constants use d,74121n tantalum or special aluminum capacitors. If CX is an electrolytic capacitor a switching diode is often required for standard TTL one-shots to prevent high inverse leakage current Figure 2.

DM74121N PDF Datasheet浏览和下载

There are three trigger inputs from the device, two negative edge-triggering A inputs, one positive edge Schmitt-triggering B input. National Semiconductor Europe Fax: For small time constants use high-quality mica, glass, polypropylene, polycarbonate, or polystyrene capacitors.

An external resistor RX or the internal resistor 2 kX and an external capacitor CX are required for proper operation. VCC and ground wiring should conform to good high-frequency dm74121h and practices so that switching transients on the VCC and ground return leads do not cause interaction between one-shots.

National Semiconductor

A non-inductive and low capacitive path is necessary to ensure complete discharge of CX in each cycle of its operation so that the output pulse width will be accurate.

Furthermore, the bypass capacitor should be located as close to the VCCpin as space permits.

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The pulse width is essentially determined by external timing components RX and CX. Output pulse width versus VCC and operation temperatures: The device should not be operated at these limits.

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DMN Datasheet(PDF) – Fairchild Semiconductor

Figure 3 depicts the relationship between pulse width variation versus VCC. For CX l pF the output is defined as: Not more than one output should be shorted at a time.

Once triggered the output pulse width is independent of further transitions of the inputs and is a function of the timing components.