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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A critical component is any component of a life support device or 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. Pulse width can vary from a few nano-seconds to 28 seconds by choosing appropriate RX and CX combinations.
Output pulse width versus VCC and operation temperatures: A high immunity to VCC noise of typically 1. The value of CX may vary datadheet 0 to dm741211n necessary value. 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 optimum and trouble free operation please read operating rules and NSC one-shot application notes carefully and observe recommendations.
The pulse width is essentially determined by external timing components RX and CX. Figure 5 details this characteristic. For small time constants use high-quality mica, glass, polypropylene, polycarbonate, or polystyrene capacitors.
For CX l pF the dm74121m is defined as: This device can be used with a single external capacitor. An internal 2kX timing resistor is provided for design convenience minimizing component count and layout problems. National Semiconductor Europe Fax: Not more than one output should be shorted at a time.
National Semiconductor – datasheet pdf
Supply Voltage 7V Input Voltage 5. For large time constants use solid tantalum or special aluminum capacitors. 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 dm47121n the pulse width the device generates.
Figure 4 depicts pulse width variation versus ambient temperature. An external resistor RX or the internal resistor 2 kX and an external capacitor CX are required for proper operation.
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.
Tsimshatsui, Kowloon Hong Kong Tel: Furthermore, the bypass capacitor should be located as close to the VCCpin as space permits. The device should not be operated at these limits.
Once triggered the output pulse width is independent of further transitions of the inputs and is a function of the timing components. 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. A non-inductive and low capacitive path is necessary to ensure complete discharge of CX in each cycle of its operation so that the datashset pulse width will be accurate.
There are three trigger inputs from the device, two negative edge-triggering A inputs, one positive edge Schmitt-triggering B input.
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 dqtasheet to the user.