7LVC1284D datasheet(6/10 Pages) PHILIPS

6 / 10 page

Philips Semiconductors

Product specification

74LVC1284

3.3V Parallel printer interface transceiver/buffer

1995 Nov 10

PULSE

GENERATOR

VIN

D.U.T.

VOUT

50pF

VCC

Test Circuit for Bn or Yn Outputs

GND

VCC

RL = 500Ω tPLH/PHL

= 62

Ω for SR test

PULSE

GENERATOR

VIN

D.U.T

VOUT

VCC

Test Circuit for An Outputs

NEGATIVE

PULSE

90%

POSITIVE

PULSE

10%

VM = 1.5V

Input Pulse Definition

74LVC

SY00004

10%

tTHL (tf)

tTLH (tr)

90%

10%

90%

tTHL (tf)

tTLH (tr)

AMP (V)

10%

90%

SWITCH POSITION

Bn or Yn Outputs

TEST

SWITCH

tPLH

GND

tPHL

VCC

DEFINITIONS

RL = Load resistor; see AC CHARACTERISTICS for value.

CL = Load capacitance includes jig and probe capacitance;

see AC CHARACTERISTICS for value.

RT = Termination resistance should be equal to ZOUT of

pulse generators.

INPUT PULSE REQUIREMENTS

FAMILY

Amplitude

Rep. Rate

3.0V

1MHz

500ns

3ns

Waveform 5.

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 1. Load Circuitry for Bn to An Switching Times

TEST CIRCUIT

D.U.T.

VCC

VCC/2

IO is measured by forcing VCC/2 on the output. RD can then

be calculated using the equation RD = VCC/2 IO .

SY00005

Figure 2. Output Impedance RD

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