HD74LS242FPEL 데이터 시트보기 (PDF) - Renesas Electronics

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HD74LS242FPEL

Quadruple Bus Transceivers (with three-state outputs)

Renesas Electronics 

HD74LS242

Testing Method

Test Circuit

4.5 V

Input

P.G.

Zout = 50 Ω

VCC

GAB

RL

Output S1

1B S3

1A

GBA

CL 5 kΩ

S2

Notes:

1. 2A-2B, 3A-3B, 4A-4B are identical to abobe load circuit.

2. CL includes probe and jig capacitance.

3. S3 is a input-output switch.

4. All diodes are 1S2074(H).

Waveforms 1

tTLH

tTHL

3V

Input A

90 %

90 %

(or B)

10 %

1.3 V

tPHL

1.3 V

10 %

0V

tPLH

VOH

Output B

(or A)

1.3 V

1.3 V

VOL

Note: Input pulse: tTLH ≤ 15 ns, tTHL ≤ 6 ns, PRR = 1 MHz, duty cycle 50%

Rev.3.00, Jul.15.2005, page 4 of 6

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