74LS244 查看數據表（PDF） - System Logic Semiconductor
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74LS244 Datasheet PDF : 4 Pages
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SL74LS244
note 1: Not more than one output should be shorted at a time, and duration of the short-circuit should not exceed
one second
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
tPLZ
Output Disable Time
CL = 5 pF
RL = 667 Ω
18
ns
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
SLS
System Logic
Semiconductor
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