SN54HC373, SN74HC373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCLS140B – DECEMBER 1982 – REVISED MAY 1997
PARAMETER MEASUREMENT INFORMATION
V
CC
PARAMETER
R
C
L
S1
S2
L
50 pF
or
150 pF
t
Open
Closed
Closed
Open
S1
S2
PZH
Test
Point
t
t
1 kΩ
1 kΩ
en
R
t
L
PZL
From Output
Under Test
t
t
Open
Closed
Open
PHZ
PLZ
50 pF
C
dis
L
Closed
(see Note A)
50 pF
or
150 pF
t
or t
––
Open
Open
pd
t
LOAD CIRCUIT
V
CC
Reference
Input
50%
V
CC
0 V
High-Level
Pulse
50%
50%
t
t
h
su
0 V
V
CC
t
Data
Input
w
90%
90%
50%
10%
50%
10%
V
CC
Low-Level
Pulse
0 V
50%
50%
t
t
f
r
0 V
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
PULSE DURATIONS
Output
V
CC
V
CC
Control
(Low-Level
Enabling)
Input
50%
50%
50%
50%
0 V
0 V
t
t
PLH
PHL
90%
t
t
PLZ
PZL
V
V
OH
≈ V
CC
50%
≈ V
CC
Output
Waveform 1
(See Note B)
In-Phase
Output
90%
t
50%
10%
50%
10%
10%
90%
OL
V
OL
t
r
f
t
t
t
PZH
PHL
90%
PLH
V
V
OH
V
Output
Waveform 2
(See Note B)
OH
90%
t
Out-of-
Phase
Output
50%
10%
50%
10%
50%
≈ 0 V
OL
t
t
PHZ
f
r
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
NOTES: A.
C includes probe and test-fixture capacitance.
L
B. 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.
C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, Z = 50 Ω, t = 6 ns, t = 6 ns.
O
r
f
D. The outputs are measured one at a time with one input transition per measurement.
E.
F.
G.
t
t
t
and t
and t
and t
are the same as t
are the same as t
are the same as t
.
dis
en
.
pd
PLZ
PZL
PLH
PHZ
PZH
PHL
.
Figure 1. Load Circuit and Voltage Waveforms
6
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TI [ TEXAS INSTRUMENTS ]
