74121 Просмотр технического описания (PDF) - Fairchild Semiconductor
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74121 Datasheet PDF : 5 Pages
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Switching Characteristics
At VCC = 5V and TA = 25°C (See Test Waveforms and Output Load Section)
Symbol
Parameter
From (Input)
To (Output)
tPLH
Propagation Delay Time
LOW-to-HIGH Level Output
A1, A2
to Q
tPLH
Propagation Delay Time
B to
LOW-to-HIGH Level Output
Q
tPHL
Propagation Delay Time
HIGH-to-LOW Level Output
A1, A2
to Q
tPHL
Propagation Delay Time
B
HIGH-to-LOW Level Output
to Q
tW(OUT)
Output Pulse
Width Using the
A1, A2 or B
to Q, Q
Internal Timing Resistor
tW(OUT)
Output Pulse
Width Using Zero
Timing Capacitance
A1, A2
to Q, Q
tW(OUT)
Output Pulse
Width Using External
Timing Resistor
A1, A2
to Q, Q
A1, A2
to Q, Q
Conditions
CEXT = 80 pF
RINT to VCC
CL = 15 pF
RL = 400Ω
CEXT = 80 pF
RINT to VCC
RL = 400Ω
CL = 15 pF
CEXT = 0 pF
RINT to VCC
RL = 400Ω
CL = 15 pF
CEXT = 100pF
RINT = 10 kΩ
RL = 400Ω
CL = 15pF
CEXT = 1 µF
RINT = 10 kΩ
RL = 400Ω
CL = 15 pF
Min
Max
Units
70
ns
55
ns
80
ns
65
ns
70
150
ns
50
ns
600
800
ns
6
8
ms
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