HD74BC640A データシートの表示（PDF） - Renesas Electronics

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HD74BC640A

Octal Bus Transceivers With 3 State Outputs

Renesas Electronics 

HD74BC640A

Test Circuit

VCC

Input

Pulse

Generator

Zout = 50 Ω

VCC

G

A1 S1

B1

Output

CL =

50 pF

500 Ω

450 Ω

50 Ω

Scope

DIR

OPEN *4

7V

Notes:

1. CL includes probe and jig capacitance.

2. A2-B2 to A8-B8 are identical to above load circuit.

3. S1: Input-Output change switch.

4. Open: tPLH, tPHL, tZH tHZ

7 V: tZL, tLZ

Waveforms-1

tf

tr

Input

90 %

1.5 V

10 %

tPLH

90 %

3V

1.5 V

10 %

0V

tPHL

Output

VOH

1.5 V

1.5 V

VOL

Rev.2.00, Jul.16.2004, page 5 of 7

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