SL74LS138N 查看數據表（PDF） - System Logic Semiconductor

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SL74LS138N

3-to-8-line decoder/demultiplexer.

System Logic Semiconductor 

SL74LS138

AC ELECTRICAL CHARACTERISTICS (TA=25°C, VCC = 5.0 V, CL = 15 pF, RL = 2 kΩ, tr =15

ns, tf = 6.0 ns)

Symbol

Parameter

Level

Min

Max

Unit

tPLH Maximum Propagation Delay, Input A to

Output Y

2

20

ns

tPHL Maximum Propagation Delay, Input A to

Output Y

41

ns

tPLH Maximum Propagation Delay, Input A to

Output Y

3

27

ns

tPHL Maximum Propagation Delay, Input A to

Output Y

39

ns

tPLH Maximum Propagation Delay , CS1 to

Output Y

3

26

ns

tPHL Maximum Propagation Delay , CS1 to

Output Y

38

ns

tPLH Maximum Output Transition Time , CS2 or CS3

to Output Y

2

18

ns

tPHL Maximum Output Transition Time , CS2 or CS3

to Output Y

32

ns

Figure 1. Switching Waveforms

Figure 2. Switching Waveforms

Figure 3. Switching Waveforms

SLS

System Logic

Semiconductor

NOTES A. CL includes probe and jig capacitance.

B. All diodes are 1N916 or 1N3064.

Figure 4. Test Circuit

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