HD74HC240TELL 查看數據表（PDF） - Renesas Electronics

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HD74HC240TELL

Octal Buffers/Line Drivers/Line Receivers(with inverted 3-state outputs)

Renesas Electronics 

HD74HC240

Test Circuit

VCC

Input

Pulse Generator

Zout = 50 Ω

VCC

1G, 2G

Output

1Y1 to 2Y4

1A1 to 2A4

1 k Ω S1

CL =

50 pF

OPEN

GND

VCC

Note : 1. CL includes probe and jig capacitance.

TEST

tPLH / t PHL

tZH/ t HZ

tZL / t LZ

S1

OPEN

GND

VCC

Waveforms

• Waveform – 1

tf

tr

90 %

90 %

VCC

Input A

50 %

50 %

10 %

10 %

0V

tPLH

tPHL

Output Y

50 %

10 %

90 %

tTLH

90 %

VOH

50 %

10 %

VOL

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

90 %

VOH

50 %

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 7

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