HD74HC251 查看數據表（PDF） - Renesas Electronics

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HD74HC251

1 of 8 Data Selectors/Multiplexers (with 3-state outputs)

Renesas Electronics 

HD74HC251

Waveforms

• Waveform – 1

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 %

tTHL

90 %

VOH

50 %

10 %

VOL

tTLH

• Waveform – 2

tf

tr

90 %

90 %

VCC

Input G

50 %

50 %

10 %

10 %

0V

tZL

tLZ

Waveform – A

Waveform – B

50 %

tZH

50 %

10 %

tHZ

90 %

VOH

VOL

VOH

VOL

Notes : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, tr ≤ 6 ns, tf ≤ 6 ns

2. Waveform– A is for an output with internal conditions such that the

output is low except when disabled by the output control.

3. Waveform– B is for an output with internal conditions such that the

output is high except when disabled by the output control.

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

Rev.2.00 Jan 31, 2006 page 6 of 8

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