74LVC245A datasheet(6/10 Pages) PHILIPS

Part #	74LVC245A

Description	Octal bus transceiver with direction pin with 5-volt tolerant inputs/outputs (3-State)

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

Product specification

74LVC245A

74LVCH245A

Octal bus transceiver with direction pin with

5-volt tolerant inputs/outputs (3-State)

1998 May 20

6

AC CHARACTERISTICS

GND = 0V; tr = tf v 2.5ns; CL = 50pF; RL = 500Ω; Tamb = –40°C to +85°C.

LIMITS

SYMBOL

PARAMETER

WAVEFORM

VCC = 3.3V ±0.3V

VCC = 2.7V

VCC = 1.2V

UNIT

MIN

TYP1

MAX

MIN

MAX

TYP

tPHL

tPLH

Propagation delay

An to Bn;

Bn to An

1, 3

1.5

3.6

6.3

1.5

7.3

16

ns

tPZH

tPZL

3-State output enable time

OE to An;

OE to Bn

2, 3

1.5

5.1

8.5

1.5

9.5

23

ns

tPHZ

tPLZ

3-State output disable time

OE to An;

OE to Bn

2, 3

1.5

4.5

7.0

1.5

8.0

16

ns

NOTE:

1. Unless otherwise stated, all typical values are at VCC = 3.3V and Tamb = 25°C.

AC WAVEFORMS

VM = 1.5V at VCC w 2.7V; VM = 0.5 VCC at VCC t 2.7V.

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

output load.

VX = VOL + 0.3V at VCC w 2.7V; VX = VOL + 0.1 VCC at VCC t 2.7V

VY = VOH –0.3V at VCC w 2.7V; VY = VOH – 0.1 VCC at VCC t 2.7V

SY00041

INPUT

VM

tPHL

tPLH

VOL

VI

VM

GND

VOH

OUTPUT

Waveform 1. Input (Dn) to output (Qn) propagation delays.

tPLZ

tPZL

VI

nOE INPUT

GND

VCC

Qn OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

VOH

Qn OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

outputs

enabled

outputs

enabled

outputs

disabled

tPHZ

VM

tPZH

VX

VY

SW00207

Waveform 2. 3-State enable and disable times.

TEST CIRCUIT

PULSE

GENERATOR

RT

VIN

D.U.T.

VOUT

CL

VCC

RL=500 Ω

SWITCH POSITION

TEST

SWITCH

tPLH/tPHL

Open

tPLZ/tPZL

2

<VCC

tPHZ/tPZH

GND

Test Circuit for 3-State Outputs

Open

GND

S1

2

<VCC

DEFINITIONS

VCC

t 2.7V

2.7 – 3.6V

VIN

VCC

2.7V

RL = Load resistor

CL = Load capacitance includes jig and probe capacitance

RT = Termination resistance should be equal to ZOUT

of pulse generators.

SW00047

RL=500 Ω

Waveform 3. Load circuitry for switching times.

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