IN74HC21A Просмотр технического описания (PDF) - IK Semicon Co., Ltd
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IN74HC21A Datasheet PDF : 5 Pages
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IN74HC21A
AC ELECTRICAL CHARACTERISTICS (CL=50pF,Input tr=tf=6.0 ns)
Symbol
Parameter
tPHL, tPLH Maximum Propagation Delay (Figure 1)
tTHL, tTLH Maximum Output Transition Time
(Figure 1)
CIN Maximum Input Capacitance
VCC
Guaranteed Limit
V 25 °C ≤85°C ≤125°C Unit
to
-55°C
2.0 110
140
165
ns
4.5 22
28
33
6.0 19
24
28
2.0 75
95
110
ns
4.5 15
19
22
6.0 13
16
19
5.0 10
10
10
pF
Power Dissipation Capacitance (Per Gate)
TA=25°C,VCC=5.0 V
CPD Used to determine the no-load dynamic power
50
pF
consumption:
PD=CPDVCC2f+ICCVCC
tLH
tHL
0.9
Input
V2
0.1
tPLH
0.9
V2
0.1
tPHL
Output
0.9
V2
0.1
tTLH
0.9
V2
0.1
tTHL
V1 = 0.5 VCC
Figure 1. Switching Waveforms
V1
GND
VCC
0V
VI
PULSE
GENERATOR
VCC
DEVICE
UNDER
RT
TEST
VO
CL
50 pF
Termination resistance RT – should
be equal to ZOUT of pulse generators
Figure 2. Test Circuit
Rev. 00
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