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74HCT423DB 데이터시트(PDF) 10 Page - NXP Semiconductors

부품명 74HCT423DB
상세설명  Dual retriggerable monostable multivibrator with reset
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제조업체  NXP [NXP Semiconductors]
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74HC_HCT423_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 24 July 2008
10 of 23
NXP Semiconductors
74HC423; 74HCT423
Dual retriggerable monostable multivibrator with reset
[1]
tpd is the same as tPHL and tPLH.
[2]
tt is the same as tTHL and tTLH.
[3]
For other REXT and CEXT combinations see Figure 8. If CEXT > 10 pF, the next formula is valid:
tW = K × REXT × CEXT (typ.), where:
tW = output pulse width in ns;
REXT = external resistor in kΩ;
CEXT = external capacitor in pF;
K = 0.55 for VCC = 2.0 V and 0.45 for VCC = 5.0 V; see Figure 9.
Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF.
[4]
The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT. The output pulse width will only be
extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time.
If CEXT > 10 pF, the next formula (at VCC = 5.0 V) for the set-up time of a retrigger pulse is valid:
trtrig = 30 + 0.19 × REXT × CEXT0.9 + 13 × REXT1.05 (typ.); where:
trtrig = retrigger time in ns;
CEXT = external capacitor in pF;
REXT = external resistor in kΩ.
Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF.
[5]
When the device is powered-up, initiate the device via a reset pulse, when CEXT < 50 pF.
[6]
CPD is used to determine the dynamic power dissipation (PD in µW):
PD =CPD × VCC2 × fi × N+ ∑ (CL × VCC2 × fo); where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑ (C
L × VCC
2
× f
o) = sum of outputs.
CPD
power
dissipation
capacitance
per package; VI = GND to VCC − 1.5 V
[6]
-
56
-
----
pF
Table 7.
Dynamic characteristics …continued
GND = 0 V; test circuit see Figure 12.
Symbol Parameter
Conditions
25
°C
−40 °Cto
+85
°C
−40 °Cto
+125
°C
Unit
Min
Typ
Max
Min Max Min Max


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