HD74LS257P datasheet(4/6 Pages) RENESAS

Teilenummer	HD74LS257P

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

PDF	6 Pages

Scroll/Zoom	100%

Hersteller	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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4 / 6 page

HD74LS257

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

Testing Method

Test Circuit

Input

P.G.

Zout = 50

Ω

Output

VCC

4.5V

Notes:

CL includes probe and jig capacitance.

All diodes are 1S2074(H).

Waveform

Output

Control

Waveform 1

S1 closed,

S2 open

S1 and, S2 closed

S1 open, S2 closed

S1 and,

S2 closed

Waveform 2

1.3V

0.5V

tTHL

tTLH

tZL

tLZ

tHZ

tZH

VOH

VOL

4.5V

10%

90%

1.5V

Notes:

Input pulse; tTLH

≤ 15 ns, t

THL

≤ 6 ns, PRR = 1 MHz, duty cycle = 50%

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

disabled by the output control.

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

disabled by the output control.

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