SN74LVCZ161284A
19-BIT IEEE STD 1284 TRANSLATION TRANSCEIVER
WITH ERROR-FREE POWER UP
SCES358B – SEPTEMBER 2001 – REVISED MAY 2005
www.ti.com
PARAMETER MEASUREMENT INFORMATION
V
CC
×
2 V
From Output
Under Test
C
L
= 50 pF
(see Note A)
500
Ω
S1
Open
GND
500
Ω
When Measuring the Cable Side, V
CC
CABLE
×
2 V
TEST
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
Open
V
CC
×
2 V
GND
LOAD CIRCUIT
Output
Control
t
PZL
Output
Waveform 1
S1 at V
CC
×
2 V
(see Note C)
t
PZH
V
OH
Output
Waveform 2
S1 at GND
(see Note C)
2.7 V
1.4 V
1.4 V
0V
t
PLZ
V
OH
1.4 V
V
OL
+ 0.3 V
t
PHZ
1.4 V
V
OH
− 0.3 V
V
OH
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
V
OL
Input
(see Note B)
2.7 V
1.4 V
1.4 V
0V
t
PLH
t
PHL
Output
50% V
CC
50% V
CC
V
OL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES (B to A)
B-TO-A LOAD (TOTEM POLE)
V
CC
CABLE
500
Ω
TP1
From
B or Y Output
Under Test
Sink Load
t
PHL
t
PLH
Source Load
C
L
= 50 pF
(see Note A)
Input
(see Note D)
t
PLH
1.4 V
t
w
2.7 V
1.4 V
0V
t
PHL
V
OH
Output
500
Ω
C
L
= 50 pF
(see Note A)
V
OL
+ 1.4 V
V
OH
− 1.4 V
V
OL
VOLTAGE WAVEFORMS MEASURED AT TP1
PROPAGATION DELAY TIMES (A to B)
A-TO-B LOAD OR A-TO-Y LOAD (TOTEM POLE)
NOTES: A. C
L
includes probe and jig capacitance.
B. Input rise and fall times are 3 ns.
C. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control.
D. Input rise and fall times are 3 ns. Pulse duration is 150 ns < t
w
< 10
µs.
E. The outputs are measured one at a time, with one transition per measurement.
F. t
PLZ
and t
PHZ
are the same as t
dis
.
G. t
PZL
and t
PZH
are the same as t
en
.
H. t
PLH
and t
PHL
are the same as t
pd
.
Figure 3. Load Circuits and Voltage Waveforms
8
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