74LVC240 Просмотр технического описания (PDF) - Philips Electronics

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74LVC240

Octal buffer/line driver with 5 V tolerant inputs/outputs; inverting(3-state)

Philips Electronics 

Philips Semiconductors

Octal buffer/line driver with 5 V tolerant

inputs/outputs; inverting (3-state)

Product specification

74LVC240A

handbook, full pagewidth

VI

nOE input

GND

Qn output VCC

LOW-to-OFF

OFF-to-LOW

VOL

Qn output VOH

HIGH-to-OFF

OFF-to-HIGH

GND

VM

tPLZ

tPZL

tPHZ

VX

VY

VM

tPZH

VM

outputs

enabled

outputs

disabled

outputs

enabled

MGU782

VM = 1.5 V at VCC ≥ 2.7 V; VM = 0.5VCC at VCC < 2.7 V.

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

VX = VOL + 0.3 V at VCC ≥ 2.7 V; VX = VOL + 0.1VCC at VCC < 2.7 V.

VY = VOH − 0.3 V at VCC ≥ 2.7 V; VY = VOH − 0.1VCC at VCC < 2.7 V.

Fig.6 3-state enable and disable times.

handbook, full pagewidth

VI

PULSE

GENERATOR

VCC

VO

D.U.T.

RT

S1

RL

500 Ω

2 × VCC

open

GND

CL

50 pF

RL

500 Ω

MNA368

VCC

< 2.7 V

2.7 to 3.6 V

TEST

tPLH/tPLH

tPHZ/tPZH

tPHZ/tPZH

2002 Oct 02

VI

VCC

2.7 V

S1

open

2 x VCC

GND

Definitions for test circuits:

RL = Load resistor.

CL = Load capacitance including jig and probe capacitance.

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

Fig.7 Load circuitry for switching times.

8

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