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 pulse width is essentially determined by external timing components RX and CX.
National Semiconductor – datasheet pdf
To obtain optimum and trouble free operation please read operating rules and NSC one-shot application notes carefully and observe recommendations. Output pulse width versus VCC and operation temperatures: For small time constants use high-quality mica, glass, polypropylene, polycarbonate, or polystyrene capacitors.
Tsimshatsui, Kowloon Hong Kong Tel: A critical component is any cm74121n of a life support device xatasheet system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
Supply Voltage 7V Input Voltage 5. There are three trigger inputs from the device, two datadheet edge-triggering A inputs, one positive edge Schmitt-triggering B input.
Once triggered the output pulse width is independent of further transitions of the inputs and is a function of the timing components. This device can be used with a single external capacitor. Figure 4 depicts pulse width variation versus ambient temperature.
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.
If datsheet timing capacitors have leakages approaching nA or if stray capacitance from either terminal to ground is greater than ddm74121n pF the timing equations may not represent the pulse width the device generates. 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 result in a significant injury to the user.
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. Figure 3 depicts the relationship between pulse width variation versus VCC.
The device should not be operated at these limits. An internal 2kX timing resistor is provided for design convenience minimizing component count and layout problems. Furthermore, the bypass capacitor should be located as close to the VCCpin as space permits.
For large time constants use solid tantalum or special aluminum capacitors. Pulse width can vary from a few nano-seconds to 28 seconds by choosing appropriate RX and CX combinations. An external resistor RX or the internal resistor 2 kX and an external capacitor CX are required for proper operation. Figure 5 details this characteristic. The value of CX may vary from 0 to any necessary value. A non-inductive and low capacitive path is necessary to ensure complete datawheet of CX in each cycle of its operation so that the output pulse width will be accurate.
Not more than one output should be shorted at a time. National Semiconductor Europe Fax: For CX l pF the output is defined as: 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. A high immunity to VCC noise of typically 1.