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TC74HC4538AP Datasheet(PDF) 3 Page - Toshiba Semiconductor |
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TC74HC4538AP Datasheet(HTML) 3 Page - Toshiba Semiconductor |
3 / 15 page TC74HC4538AP/AF/AFN/AFT 2007-10-01 3 Block Diagram (Note 1)(Note 2) Note 1: CX, RX, DX are external. Capacitor, resistor, and diode, respectively. Note 2: External clamping diode, DX The external capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied. Supply voltage is turned off and CX is discharged mainly through the internal (parasitic) diode. If CX is sufficiently large and VCC drops rapidly, there will be some possibility of damaging the IC by rush current or latch-up. If the capacitance of the supply voltage filter is large enough and VCC drops slowly, the rush current is automatically limited and damage to the IC is avoided. The maximum value of forward current through the parasitic diode is ±20 mA. In the case of a large CX, the limitation of fall time of the supply voltage is determined as follows: tf ≥ (VCC − 0.7) CX/20 mA (tf is the time from the voltage supply turning off to the level of supply voltage reaching 0.4 VCC.) In the care of a system that does not satisfy the above condition, an external clamping diode is needed to protect the IC from rush current. CX 4 5 6 7 1 2 DX VCC RX T1 T2 3 CD A B Q Q CX 12 11 10 9 15 14 DX VCC RX T1 T2 13 CD A B Q Q |
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