HD74HC688 查看數據表（PDF） - Renesas Electronics

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HD74HC688

Octal Bus Transceivers(with inverted 3-state outputs)

Renesas Electronics 

HD74HC688

Test Circuit

VCC

Input

Pulse Generator

Zout = 50 Ω

VCC

G

P1

Output

P7

P=Q

Q0

Q7

CL =

50 pF

Note : 1. CL includes probe and jig capacitance.

Waveforms

• Waveform – 1

P or Q

P=Q

• Waveform – 2

G

P=Q

tr

90%

50%

10%

tw

tPLH

90%

50%

tTLH

tf

90%

50%

10%

tPHL

90%

50%

10%

tTHL

tf

90%

50%

10%

tPHL

90%

50%

10%

tTHL

tr

10%

90%

50%

tPLH

50%

10%

90%

tTLH

VCC

0V

VOH

VOL

VCC

0V

VOH

VOL

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

Rev.2.00, Mar 30, 2006 page 5 of 7

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