HD74HCT138 데이터 시트보기 (PDF) - Renesas Electronics

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HD74HCT138

3-to-8-line Decoder/Demultiplexer

Renesas Electronics 

HD74HCT138

Test Circuit

VCC

Input

Pulse Generator

Zout = 50 Ω

Input

Pulse Generator

Zout = 50 Ω

VCC

A

B

C

G1

G2A

G2B

Output

Y0

Output

Y7

CL = 50 pF

CL = 50 pF

Note : 1. CL includes probe and jig capacitance.

Waveforms

Input

tr

10 %

90 %

1.3 V

tPLH

tf

90 %

1.3 V

10 %

tPHL

VCC

0V

Same-phase output

1.3 V

10 %

90 %

tPHL tTLH

90 %

1.3 V

10 %

tPLH

tTHL

VOH

VOL

Inverse-phase output

90 %

1.3 V

10 %

90 %

VOH

1.3 V

10 %

VOL

tTHL

tTLH

Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns

2. The output are measured one at a time with one transition per measurement.

Rev.2.00 Mar 30, 2006 page 4 of 5

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