HD74HC243FP 查看數據表（PDF） - Renesas Electronics

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HD74HC243FP

Quad. Bus Transceivers (with noninverted 3-state outputs)

Renesas Electronics 

HD74HC243

Test Circuit

VCC

Input

Pulse Generator

Zout = 50 Ω

VCC

GAB

Output

B or A

GBA

1 k Ω S1

CL =

50 pF

OPEN

GND

VCC

A or B

TEST

tPLH / t PHL

tZH/ t HZ

tZL / t LZ

S1

OPEN

GND

VCC

Waveforms

Note : 1. CL includes probe and jig capacitance.

• Waveform – 1

Input A or B

tr

10 %

90 %

50 %

tPLH

tf

90 %

50 %

10 %

tPHL

Output B or A

50 %

10 %

90 %

90 %

50 %

10 %

tTLH

tTHL

• Waveform – 2

tf

tr

GAB

or

GBA

90 %

50 %

10 %

tZL

10 %

90 %

50 %

tLZ

Waveform - A

Waveform - B

50 %

tZH

50 %

10 %

tHZ

90 %

VCC

GND

VOH

VOL

VCC

GND

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 5 of 6

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