HD74LS257FPEL データシートの表示（PDF） - Renesas Electronics

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HD74LS257FPEL

Quadruple 2-line-to-1-line Data Selectors / Multiplexers (with not inverted 3-state outputs)

Renesas Electronics 

HD74LS257

Testing Method

Test Circuit

4.5V

Input

P.G.

Zout = 50Ω

VCC

OC

Output

S

Y

A

B

CL

RL

S1

5kΩ

S2

Notes: 1. CL includes probe and jig capacitance.

2. All diodes are 1S2074(H).

Waveform

Output

Control

tTHL

90%

1.3V

10%

tZL

Waveform 1

S1 closed,

S2 open 1.3V

tZH

Waveform 2

1.3V

S1 open, S2 closed

tTLH

3V

90%

3V

1.3V

10%

0V

0V

4.5V

VOL

VOH

0V

tLZ

S1 and,

S2 closed

1.5V

VOL

tHZ

0.5V

VOH

0.5V

S1 and, S2 closed

1.5V

Notes:

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

2. Waveform 1 is for an output with internal conditions such that the output is low except when

disabled by the output control.

3. Waveform 2 is for an output with internal conditions such that the output is high except when

disabled by the output control.

Rev.3.00, Jul.15.2005, page 4 of 5

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