7LVC1284D datasheet(5/10 Pages) PHILIPS

5 / 10 page

Philips Semiconductors

Product specification

74LVC1284

3.3V Parallel printer interface transceiver/buffer

1995 Nov 10

AC WAVEFORMS

VM = 1.5V

VX = VOL "0.3V

VY = VOH –0.3V

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

output load. (VCC never goes below 3.0V).

tPLH

tPHL

VOH

VOL

SY00001

INPUTS

GND

OUTPUTS

V = 2.7V

Waveform 1.

Input Bn to output An propagation delays

VCC

OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

VOH

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

tPZH

tPZL

tPHZ

tPLZ

outputs

enabled

outputs

disabled

outputs

enabled

DIR

to A

DIR

to B

SY00002

Waveform 2.

3-State enable and disable times

tPLH

tPHL

SY00008

INPUT

OUTPUT

2.4V

1.4V

0.4V

VOUT

VOUT –1.4V

1.4V

Waveform 3.

Voltage Waveforms Propagation Delay Times

(A To B) Measured at Output Pin

0.4V

2.4V

0.9V

0.4V

2.4V

1.9V

INPUT

OUTPUT

SY00007

Waveform 4.

Slew Rate Waveforms Voltage Waveforms

(Input pulse rise and fall time are 3ns, 150ns

t pulse width t10 µs,

for both a Low to High and a High to Low transition.)

Slew Rate measured between 0.4V and 0.9V - rising.

Slew Rate measured between 2.4V and 1.9V - falling.

Slew Rate measured at TP1.

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