IN74LS244 查看數據表（PDF） - Integral Corp.
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IN74LS244 Datasheet PDF : 6 Pages
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IN74LS244
AC ELECTRICAL CHARACTERISTICS (TA = 25°C, VCC = 5.0 V, tr = 15 ns,
tf = 6.0 ns)
Symbol
Parameter
Test Condition
Min
Max
Unit
tPLH Propagation Delay, Data to
Output
18
ns
tPHL Propagation Delay, Data to
Output
CL = 45 pF,
RL = 667 Ω
18
ns
tPZH Output Enable Time
23
ns
tPZL Output Enable Time
30
ns
tPHZ Output Disable Time
CL = 5 pF
18
ns
tPLZ Output Disable Time
RL = 667 Ω
25
ns
Figure 1. Switching Waveforms
(See Figure 3)
tPZL - S1 closed, S2 opened
tPZH- S1 opened, S2 closed
tPLZ, tPHZ - S1 and S2 closed
Figure 2. Switching Waveforms
(See Figure 4)
NOTES A. CL includes probe and jig capacitance.
B. All diodes are 1N916 or 1N3064.
Figure 3. Test Circuit
NOTES A. CL includes probe and jig capacitance.
B. All diodes are 1N916 or 1N3064.
Figure 4. Test Circuit
4
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