HD74HC238FP(2006) 查看數據表（PDF） - Renesas Electronics

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HD74HC238FP
(Rev.:2006)

3-to-8-line Decoder/Demultiplexer

Renesas Electronics 

HD74HC238

Switching Characteristics

Item

Propagation delay

time

Output rise/fall

time

Input capacitance

Symbol VCC (V)

tPLH

2.0

tPHL

4.5

6.0

2.0

4.5

6.0

tTLH

2.0

tTHL

4.5

6.0

Cin

—

Ta = 25°C

Min Typ Max

— — 150

— 15 30

— — 26

— — 150

— 13 30

— — 26

— — 75

— 5 15

— — 13

— 5 10

(CL = 50 pF, Input tr = tf = 6 ns)

Ta = –40 to +85°C

Unit

Min

Max

Test Conditions

—

190 ns Select to Y

—

38

—

33

—

190 ns Enable to Y

—

38

—

33

—

95

ns

—

19

—

16

—

10 pF

Test Circuit

Measurement point

CL*

Note: CL includes the probe and fig capacitance.

Waveforms

tr

tf

90 %

90 %

VCC

Input

50 %

50 %

10 %

10 %

0V

tPLH

tPHL

Same-phase output

50 %

10 %

90 %

tPHL tTLH

90 %

VOH

50 %

10 %

VOL

tPLH

tTHL

Inverse-phase output

90 %

50 %

10 %

90 %

VOH

50 %

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 Jan 31, 2006 page 4 of 6

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