SN54AHC138, SN74AHC138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SCLS258L – DECEMBER 1995 – REVISED JULY 2003

5

POST OFFICE BOX 655303

switching characteristics over recommended operating free-air temperature range,

PARAMETER

FROM

TO

LOAD

TA = 25°C

SN54AHC138

SN74AHC138

UNIT

PARAMETER

(INPUT)

(OUTPUT)

CAPACITANCE

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

tPLH

ABC

Any Y

CL =15 pF

5.7*

8.1*

1*

9.5*

1

9.5

ns

tPHL

A, B, C

Any Y

CL = 15 pF

5.7*

8.1*

1*

9.5*

1

9.5

ns

tPLH

G1

Any Y

CL =15 pF

5.6*

8.1*

1*

9.5*

1

9.5

ns

tPHL

G1

Any Y

CL = 15 pF

5.6*

8.1*

1*

9.5*

1

9.5

ns

tPLH

G2A G2B

Any Y

CL =15 pF

5.8*

8.1*

1*

9.5*

1

9.5

ns

tPHL

G2A, G2B

Any Y

CL = 15 pF

5.8*

8.1*

1*

9.5*

1

9.5

ns

tPLH

ABC

Any Y

CL =50 pF

7.2

10.1

1

11.5

1

11.5

ns

tPHL

A, B, C

Any Y

CL = 50 pF

7.2

10.1

1

11.5

1

11.5

ns

tPLH

G1

Any Y

CL =50 pF

7.1

10.1

1

11.5

1

11.5

ns

tPHL

G1

Any Y

CL = 50 pF

7.1

10.1

1

11.5

1

11.5

ns

tPLH

G2A G2B

Any Y

CL =50 pF

7.3

10.1

1

11.5

1

11.5

ns

tPHL

G2A, G2B

Any Y

CL = 50 pF

7.3

10.1

1

11.5

1

11.5

ns

* On products compliant to MIL-PRF-38535, this parameter is not production tested.

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance

No load,

f = 1 MHz

13

pF