74LVC257A datasheet(6/10 Pages) PHILIPS

부품명	74LVC257A

상세설명	Quad 2-input multiplexer with 5 Volt tolerant inputs/outputs (3-State)

PDF	10 Pages

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제조업체	PHILIPS [NXP Semiconductors]

홈페이지	http://www.nxp.com

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6 / 10 page

Philips Semiconductors

Product specification

74LVC257A

Quad 2-input multiplexer with 5 Volt tolerant

inputs/outputs (3-State)

1998 Jul 29

AC WAVEFORMS

VM = 0.5 × VCC at VCC < 2.7 V

VM = 1.5 V at VCC ≥ 2.7 V

VX = VOL + 0.3 V at VCC ≥ 2.7 V

VX = VOL + 0.1 × VCC at VCC < 2.7 V

VY = VOH – 0.3 V at VCC ≥ 2.7V

VY = VOH – 0.1 × VCC at VCC < 2.7 V

VOL and VOH are the typical output voltage drop that occur with the

output load.

SV00641

S, nI0, nI1

INPUTS

nY OUTPUT

tPLH

tPHL

GND

VCC

VOL

VOH

Figure 1. Input (S, nl0, nl1) to output (nY) propagation delays.

SV00642

outputs

disabled

outputs

enabled

outputs

enabled

tPHZ

tPZH

tPZL

tPLZ

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

OUTPUT

LOW-to-OFF

OFF-to-LOW

OE INPUT

VOL

VOH

GND

VCC

Figure 2. 3-state enable and disable times.

TEST CIRCUIT

PULSE

GENERATOR

D.U.T.

50pF

2 x VCC

Open

GND

500

Ω

500

Ω

VCC

t 2.7V

VCC

2.7V – 3.6V

2.7V

Test

GND

tPLZ/tPZL

2 x VCC

tPHZ/tPZH

tPLH/tPHL

Open

SY00003

VCC

Figure 3. Load circuitry for switching times.

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