SN54173, SN54LS173A, SN74173, SN74LS173A
4-BIT D-TYPE REGISTERS
WITH 3-STATE OUTPUTS
SDLS067A – OCTOBER 1976 – REVISED JUNE 1999
switching characteristics, V
= 5 V, T = 25°C, R = 667 Ω (see Figure 2)
A L
CC
SN54LS173A
SN74LS173A
PARAMETER
TEST CONDITIONS
UNIT
MIN
30
TYP
MAX
MIN
30
TYP
MAX
Maximum clock frequency
Propagation delay time,
50
50
MHz
ns
f
t
max
26
17
22
35
25
30
26
17
22
35
25
30
PHL
high-to-low-level output from clear input
Propagation delay time,
low-to-high-level output from clock input
t
t
PLH
C
= 45 pF
L
ns
Propagation delay time,
high-to-low-level output from clock input
PHL
Output enable time to high level
Output enable time to low level
Output disable time from high level
Output disable time from low level
15
18
11
11
23
27
20
17
15
18
11
11
23
27
20
17
t
t
t
t
PZH
PZL
PHZ
PLZ
ns
ns
C
= 5 pF
L
8
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