HD74HC640P(2010) 查看數據表（PDF） - Renesas Electronics

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HD74HC640P
(Rev.:2010)

Octal Bus Transceivers (with 3-state outputs)

Renesas Electronics 

HD74HC640, HD74HC643

HD74HC643

• Waveform – 1

tr

tf

90 %

90 %

VCC

Input B

50 %

50 %

10 %

10 %

0V

tPLH

tPHL

Output A

50 %

10 %

90 %

90 %

VOH

50 %

10 %

VOL

tTLH

tTHL

• Waveform – 2

tf

tr

90 %

90 %

VCC

Input G

50 %

50 %

10 %

10 %

0V

tZL

tLZ

VOH

Waveform - A

50 %

10 %

tZH

tHZ

VOL

Waveform - B

50 %

90 %

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 Mar 30, 2006 page 8 of 10

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