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TC74HC4538AF Fiches technique(PDF) 3 Page - Toshiba Semiconductor

No de pièce TC74HC4538AF
Description  Dual Retriggerable Monostable Multivibrator
Download  15 Pages
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Fabricant  TOSHIBA [Toshiba Semiconductor]
Site Internet  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TC74HC4538AF Fiches technique(HTML) 3 Page - Toshiba Semiconductor

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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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