74LVC1284 Ver la hoja de datos (PDF) - Philips Electronics
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74LVC1284 Datasheet PDF : 10 Pages
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Philips Semiconductors
3.3V Parallel printer interface transceiver/buffer
Product specification
74LVC1284
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).
INPUTS
GND
VOH
OUTPUTS
VOL
VM
tPHL
VM
tPLH
V = 2.7V
SY00001
Waveform 1. Input Bn to output An propagation delays
INPUT
OUTPUT
1.4V
tPLH
1.4V
1.4V
tPHL
2.4V
0.4V
VOUT
VOUT –1.4V
SY00008
Waveform 3. Voltage Waveforms Propagation Delay Times
(A To B) Measured at Output Pin
DIR
to A
VM
tPLZ
tPZL
DIR
to B
VM
HD
to B
VM
VCC
OUTPUT
LOW-to-OFF
OFF-to-LOW
VOL
VOH
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
GND
tPHZ
outputs
enabled
VM
VX
tPZH
VY
outputs
disabled
VM
outputs
enabled
SY00002
Waveform 2. 3-State enable and disable times
2.4V
INPUT
0.4V
OUTPUT
0.9V
0.4V
t1 t2
2.4V
1.9V
t1 t2
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.
1995 Nov 10
5
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