CD74HC423E 查看數據表（PDF） - Harris Semiconductor
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CD74HC423E
Harris Semiconductor
CD74HC423E Datasheet PDF : 7 Pages
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CD74HC123, CD74HCT123, CD74HC423, CD74HCT423
Test Circuits and Waveforms
A
B = LOW
A = HIGH
B
R
VS
tW
tW
VS
Q
tW
tW
FIGURE 1. OUTPUT PULSE CONTROL USING RESET INPUT
(R) PULSE FOR 123
A
B
R
VS
tW
B = LOW
A = HIGH
Q
tW
VS
tW
FIGURE 2. OUTPUT PULSE CONTROL USING RESET INPUT
(R) FOR 423
A
B
tW
B
A
Q
VS
tW
trT
tW
(R = HIGH)
tW
NOTE: Output pulse control using retrigger pulse for 123 and 423.
FIGURE 3. TRIGGERING OF ONE SHOT BY INPUT A OR INPUT B FOR A PERIOD tW
8
6
4
2
103 8
6
4
2
102 8
6
4
2
101 8
6
4
2
= 100kΩ
RX
= 10kΩ
RX
DC SUPPLY VOLTAGE (VCC) = 5V
AMBIENT TEMPERATURE (TA) = 25oC
103 2 4 6 8104 2 4 6 8105 2 4 6 8106 2 4 6 8107
EXTERNAL CAPACITANCE (CX) - pF
FIGURE 4. TYPICAL OUTPUT PULSE WIDTH AS A FUNCTION
OF CX FOR RX = 10kΩ AND 100kΩ
0.9
EXTERNAL CAPACITANCE (CX) = 10nF
0.8
EXTERNAL RESISTANCE (RX) = 10kΩ TO 100kΩ
0.7
AMBIENT TEMPERATURE (TA) = 25oC
0.6
0.5
HCT
0.4
0.3
0.2
0.1
1 2 3 4 5 6 7 8 9 10 11
DC SUPPLY VOLTAGE (VCC) - VOLTS
FIGURE 5. TYPICAL “K” FACTOR AS A FUNCTION OF VCC
7
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