HD74HC643 datasheet(7/11 Pages) RENESAS

Part #	HD74HC643

Description	Octal Bus Transceivers (with 3-state outputs)

PDF	11 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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7 / 11 page

HD74HC640, HD74HC643

Rev.2.00 Mar 30, 2006 page 7 of 10

Waveforms

HD74HC640

tPHL

tPLH

VOH

VOL

0 V

VCC

10 %

90 %

50 %

10 %

90 %

• Waveform – 1

• Waveform – 2

Input A

Output B

tZL

0 V

VOL

VCC

VOH

tLZ

tZH

tHZ

10 %

90 %

50 %

Input

Waveform - A

Waveform - B

90 %

10 %

90 %

10 %

90 %

tTHL

tTLH

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.

HD74HC643 Datasheet(PDF) 7 Page - Renesas Technology Corp

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