SN54173, SN54LS173A, SN74173, SN74LS173A
4-BIT D-TYPE REGISTERS
WITH 3-STATE OUTPUTS
SDLS067A – OCTOBER 1976 – REVISED JUNE 1999
PARAMETER MEASUREMENT INFORMATION
SERIES 54LS/74LS DEVICES
V
CC
V
CC
Test
Point
Test
Point
R
L
S1
V
CC
R
L
(see
Note B)
From Output
Under Test
From Output
Under Test
(see Note B)
R
L
C
L
5 kΩ
From Output
Under Test
Test
Point
(see Note A)
C
L
(see Note A)
C
L
(see Note A)
S2
LOAD CIRCUIT FOR
2-STATE
TOTEM-POLE OUTPUTS
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
3 V
High-Level
Timing
Input
1.3 V
1.3 V
1.3 V
1.3 V
Pulse
0 V
t
w
t
h
t
su
3 V
0 V
Data
Input
Low-Level
Pulse
1.3 V
1.3 V
1.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Output
3 V
0 V
Control
(low-level
enabling)
1.3 V
1.3 V
3 V
0 V
1.3 V
1.3 V
Input
t
t
t
PZL
PLZ
≈1.5 V
Waveform 1
S2 Open
(see Notes C
and D)
t
t
PLH
PHL
1.3 V
V
In-Phase
Output
(see Note D)
OH
OL
V
OL
V
OL
+ 0.3 V
1.3 V
1.3 V
1.3 V
V
t
PZH
PHZ
t
t
PHL
PLH
V
OH
V
OH
Waveform 2
S2 Closed
(see Notes C
and D)
V
Out-of-Phase
Output
(see Note D)
– 0.3 V
OH
OL
1.3 V
1.3 V
V
≈1.5 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
NOTES: A.
C includes probe and jig capacitance.
L
B. All diodes are 1N3064 or equivalent.
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. S1 and S2 are closed for t
, t
, t
, and t
; S1 is open and S2 is closed for t
PLZ PZH
; S1 is closed and S2 is open for t .
PLH PHL PHZ
PZL
E. Phase relationships between inputs and outputs have been chosen arbitrarily for these examples.
F. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, Z ≈ 50 Ω, t ≤ 15 ns, t ≤ 6 ns.
O
r
f
G. The outputs are measured one at a time with one input transition per measurement.
Figure 2. Load Circuits and Voltage Waveforms
10
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