DM74121N DATASHEET PDF

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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The value of CX may vary from 0 to any necessary value.

VCC and ground wiring should conform to good high-frequency standards and practices so that switching transients on the VCC and ground return leads do not cause interaction between one-shots. 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.

Furthermore, the bypass capacitor should be located as close to the VCCpin as space permits. An external resistor RX or the internal resistor 2 kX and an external capacitor CX are required for proper operation.

Tsimshatsui, Kowloon Hong Kong Tel: 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. The pulse width is essentially determined by external timing datasehet RX and CX. Figure 3 depicts the relationship between pulse width variation versus VCC.

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Datashdet 4 depicts pulse width variation versus ambient temperature. National Semiconductor Europe Fax: 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. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected dm7412n cause the failure of the life support device or system, or to affect its safety or effectiveness.

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.

To obtain dm74121m and trouble free operation please read operating rules and NSC one-shot application notes carefully and observe recommendations.

National Semiconductor – datasheet pdf

A high immunity to VCC noise of typically 1. Supply Voltage 7V Input Voltage 5. The device should not be operated at these limits. For CX l pF the output is defined as: For small time constants use high-quality mica, glass, polypropylene, polycarbonate, or polystyrene capacitors.

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For large time constants use solid tantalum or special aluminum capacitors. Not more than one output should be shorted at a time.

DM74121 Datasheet

Once triggered the output pulse width is independent datassheet further transitions of the inputs and is a function of the timing components. Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to dm74121h in a significant injury to the user.

An internal 2kX timing resistor is provided for design vatasheet minimizing component count and layout problems. Pulse width can vary from a few nano-seconds to 28 seconds by choosing appropriate RX and CX combinations.

National Semiconductor

There are three trigger inputs from the device, datasbeet negative edge-triggering A inputs, one positive edge Schmitt-triggering B input. This device can be used with a single external capacitor.

Figure 5 details this characteristic. Output pulse width versus VCC and operation temperatures:

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