DM74LS138 datasheet(3/8 Pages) NSC

3 / 8 page

’LS138 Switching Characteristics

at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)

From (Input)

Levels

RL e 2kX

Symbol

Parameter

To (Output)

of Delay

CL e 15 pF

CL e 50 pF

Units

Min

Max

Min

Max

tPLH

Propagation Delay Time

Select to

218

Low to High Level Output

Output

tPHL

Propagation Delay Time

Select to

227

High to Low Level Output

Output

tPLH

Propagation Delay Time

Select to

318

Low to High Level Output

Output

tPHL

Propagation Delay Time

Select to

327

High to Low Level Output

Output

tPLH

Propagation Delay Time

Enable to

218

Low to High Level Output

Output

tPHL

Propagation Delay Time

Enable to

224

High to Low Level Output

Output

tPLH

Propagation Delay Time

Enable to

318

Low to High Level Output

Output

tPHL

Propagation Delay Time

Enable to

328

High to Low Level Output

Output

Recommended Operating Conditions

Symbol

Parameter

DM54LS139

DM74LS139

Units

Min

Nom

Max

Min

Nom

Max

VCC

Supply Voltage

475

525

VIH

High Level Input Voltage

VIL

Low Level Input Voltage

IOH

High Level Output Current

IOL

Low Level Output Current

Free Air Operating Temperature

125

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