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74AHC257

Quad 2-input multiplexer; 3-state

Philips Electronics 

Philips Semiconductors

Quad 2-input multiplexer; 3-state

Product specification

74AHC257;

74AHCT257

handbook, full pagewidth

OE input

VI

GND

output

LOW-to-OFF

OFF-to-LOW

VCC

VOL

output

HIGH-to-OFF

OFF-to-HIGH

VOH

GND

VM(1)

tPLZ

tPZL

tPHZ

VOL + 0.3 V

VOH − 0.3 V

VM(2)

tPZH

VM(2)

outputs

enabled

outputs

disabled

outputs

enabled

MNA450

FAMILY

AHC

AHCT

VI INPUT

VM(1)

REQUIREMENTS INPUT

GND to VCC

GND to 3.0 V

50% VCC

1.5 V

VM(2)

OUTPUT

50% VCC

50% VCC

Fig.7 3-state enable and disable times.

handbook, full pagewidth

PULSE

VI

GENERATOR

VCC

VO

D.U.T.

RT

S1

1000 Ω

VCC

open

GND

CL

MNA219

TEST

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

S1

open

VCC

GND

2000 Apr 03

Definitions for test circuit.

CL = load capacitance including jig and probe capacitance (See Chapter “AC characteristics”).

RT = termination resistance should be equal to the output impedance Zo of the pulse generator.

Fig.8 Load circuitry for switching times.

11

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