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M74HC4538 Folha de dados(PDF) 4 Page - STMicroelectronics |
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M74HC4538 Folha de dados(HTML) 4 Page - STMicroelectronics |
4 / 18 page Pin connection and IEC logic symbols M74HC4538 4/18 Figure 4. Timing chart Figure 5. Block diagram 1. Cx, Rx, Dx are external components. 2. Dx is a clamping diode. The external capacitor is charged to VCC in the standby state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly through an internal parasitic diode (see figures). If Cx is sufficiently large and VCC decreases rapidly, there will be some possibility of damaging the IC with a surge current or latch- up. If the voltage supply filter capacitor is large enough and VCC decreases slowly, the surge current is automatically limited and damage to the IC is avoided. The maximum forward current of the parasitic diode is approximately 20 mA. In cases where Cx is large the time taken for the supply voltage to fall to 0.4 VCC can be calculated as follows: tf > (VCC - 0.7) x Cx/20 mA. In cases where tf is too short an external clamping diode is required to protect the IC from the surge current. |
Nº de peça semelhante - M74HC4538 |
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Descrição semelhante - M74HC4538 |
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