IN74LS245 データシートの表示（PDF） - Integral Corp.

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IN74LS245

Octal 3-State Noninverting Bus Transceiver

Integral Corp. 

IN74LS245

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 Time, Low-to-High

Level Output (from A or B to Output)

12

ns

tPHL Propagation Delay Time, High-to-Low

Level Output (from A or B to Output)

CL = 45 pF,

RL = 667 Ω

12

ns

tPZH Output Enable Time to High Level (from

OE to Output)

40

ns

tPZL Output Enable Time to Low Level (from OE

to Output)

40

ns

tPHZ Output Disable Time from High Level

(from OE to Output)

CL = 5 pF

25

ns

tPLZ Output Disable Time from Low Level

(from OE to Output)

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

3

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