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| 74HCT1284 Datasheet, PDF (5/12 Pages) NXP Semiconductors – Parallel printer interface transceiver/buffer | |||
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Philips Semiconductors
Parallel printer interface transceiver/buffer
Product specification
74HCT1284
AC CHARACTERISTICS
GND = 0V, tR = tF = 3.0ns, CL = 50pF, RL = 500â¦
SYMBOL
PARAMETER
WAVEFORM
SR
B-Side Slew Rate
tPLH
Propagation delay
tPHL
A toY or A to B
2
tPLH
Propagation delay
tPHL
B to A
1
tPZH
Output enable/disable time to/from High level
tPHZ
HD to Y or HD to B
3
tPZL
Output enable/disable time to/from Low level
tPLZ
A to Y or A to B
4
LIMITS
Tamb = 25°C
VCC = 5.0V
MIN
TYP
MAX
0.05
0.11
0.4
5.0
13.9
17.1
5.0
21.0
25.7
1.5
5.3
7.5
1.5
5.6
7.9
4.0
12.0
16.0
2.0
6.5
9.1
5.0
12.7
16.3
1.5
5.0
7.1
Tamb = 0 to + 70°C
VCC = Min to Max
MIN
MAX
0.05
0.4
5.0
22
5.0
31
1.5
9.0
1.5
10.0
4.0
20.0
2.0
11.0
5.0
20.0
1.5
9.0
UNIT
V/ns
ns
ns
ns
ns
AC WAVEFORMS
For all waveforms, VM = 1.5V.
Bn Input
VM
VM
A1 â A4
Output
tPLH
tPHL
50% VCC
VOH
50% VCC
VOL
SK00003
Waveform 1. Propagation Delay for Bn to A1âA4
An Input
VM
VM
Bn or Yn
Output
tPLH
tPHL
VOHâ1.4V
VOH
VOHâ1.4V
VOL
SK00004
Waveform 2. Propagation Delay for An to Bn or Yn Outputs
HD Inputs
VM
tPZH
VM
tPHZ
Bn or Yn Output
VM
VOH
VOHâ0.3V
0V
SK00005
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
An Input
VM
tPZL
VM
tPLZ
Bn or Yn
Output
VM
VOL +0.3V
VOL
SK00006
Waveform 4. 3-State Output enable Time to Low Level and
Output disable Time from Low Level
1998 Jul 10
5
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