Nexperia

74HC154; 74HCT154

4-to-16 line decoder/demultiplexer

10.1. Waveforms and test circuit

001aab073

tPLH

tPHL

tTLH

90 %

10 %

VM

tTHL

90 %

10 %

VM

VM

VM

An input

Yn output

GND

VI

VOH

VOL

Measurement points are given in Table 9.

Fig. 7. Propagation delay address input (An) to output

(Yn) and transition time output (Yn)

001aab074

tTHL

90 %

10 %

En input

Yn output

GND

VI

VOH

VOL

tPHL

tPLH

VM

tTLH

90 %

10 %

VM

VM

VM

Measurement points are given in Table 9.

Fig. 8. Propagation delay enable input (En) to output

(Yn) and transition time output (Yn)

Table 9. Measurement points

Input

Output

Type

VM

VM

74HC154

0.5VCC

0.5VCC

74HCT154

1.3 V

1.3 V

VM

VM

tW

tW

10 %

90 %

0 V

VI

VI

negative

pulse

positive

pulse

0 V

VM

VM

90 %

10 %

tf

tr

tr

tf

001aad983

DUT

VCC

VCC

VI

VO

RT

RL

S1

CL

open

G

Test data is given in Table 10.

Definitions for test circuit:

RT = Termination resistance; should be equal to output impedance Zo of the pulse generator.

CL = Load capacitance including jig and probe capacitance.

RL = Load resistor.

S1 = Test selection switch.

Fig. 9. Test circuit for measuring switching times

74HC_HCT154

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© Nexperia B.V. 2021. All rights reserved

Product data sheet

Rev. 9 — 19 August 2021

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