SN54HC42, SN74HC42

4LINE TO 10LINE DECODERS (1 of 10)

SCLS091D − DECEMBER 1982 − REVISED SEPTEMBER 2003

5

POST OFFICE BOX 655303

(unless otherwise noted) (see Figure 1)

PARAMETER

FROM

TO

VCC

TA = 25°C

SN54HC42

SN74HC42

UNIT

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

2 V

65

150

225

190

tpd

A, B, C, or D

0−9

4.5 V

18

30

45

38

ns

tpd

A, B, C, or D

0−9

6 V

14

26

38

32

ns

2 V

28

75

110

95

tt

Any

4.5 V

8

15

22

19

ns

tt

Any

6 V

7

13

19

16

ns

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance

No load

39

pF

PARAMETER MEASUREMENT INFORMATION

VOLTAGE WAVEFORM

INPUT RISE AND FALL TIMES

50%

50%

10%

10%

90%

90%

VCC

0 V

tr

tf

Input

VOLTAGE WAVEFORMS

PROPAGATION DELAY AND OUTPUT TRANSITION TIMES

50%

50%

50%

10%

10%

90%

90%

VCC

VOH

VOL

0 V

tr

tf

Input

In-Phase

Output

50%

tPLH

tPHL

50%

50%

10%

10%

90%

90%

VOH

VOL

tr

tf

tPHL

tPLH

Out-of-Phase

Output

Test

Point

From Output

Under Test

CL = 50 pF

(see Note A)

LOAD CIRCUIT

NOTES: A. CL includes probe and test-fixture capacitance.

B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following

characteristics: PRR

≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.

C. The outputs are measured one at a time with one input transition per measurement.

D. tPLH and tPHL are the same as tpd.

Figure 1. Load Circuit and Voltage Waveforms