Datasheet
SN54173, SN54LS173A, SN74173, SN74LS173A
4-BIT D-TYPE REGISTERS
WITH 3-STATE OUTPUTS
SDLS067A – OCTOBER 1976 – REVISED JUNE 1999
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN54LS173A SN74LS173A
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.75 5 5.25 V
I
OH
High-level output current –1 –2.6 mA
I
OL
Low-level output current 12 24 mA
T
A
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
†
SN54LS173A SN74LS173A UNIT
PARAMETER
TEST
CONDITIONS
†
MIN TYP
‡
MAX MIN TYP
‡
MAX UNIT
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.7 0.8 V
V
IK
Input clamp voltage V
CC
= MIN, I
I
= –18 mA –1.5 –1.5 V
V
OH
High-level output voltage
V
CC
= MIN,
V
IL
= V
IL
max,
V
IH
= 2 V,
I
OH
= MAX
2.4 3.4 2.4 3.1 V
V
OL
Low level out
p
ut voltage
V
CC
= MIN,
I
OL
= 12 mA 0.25 0.4 0.25 0.4 V
V
OL
Lo
w-
le
v
el
o
u
tp
u
t
v
oltage
CC
,
V
IL
= 0.8 V,
I
OL
= 24 mA 0.35 0.5 V
I
O( ff)
Off-state (high-impedance state) V
CC
= MAX,
V
O
= 2.7 V 20 20
V
I
O(off)
(g )
output current
CC
,
V
IH
= 2 V
V
O
= 0.4 V –20 –20
V
I
I
Input current
at maximum input voltage
V
CC
= MAX, V
I
= 7 V 0.1 0.1 mA
I
IH
High-level input current V
CC
= MAX, V
I
= 2.7 V 20 20 µA
I
IL
Low-level input current V
CC
= MAX, V
I
= 0.4 V –0.4 –0.4 mA
I
OS
Short-circuit output current
§
V
CC
= MAX –30 –130 –30 –130 mA
I
CC
Supply current V
CC
= MAX, See Note 4 19 30 19 24 mA
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡
All typical values are at V
CC
= 5 V, T
A
= 25°C.
§
Not more than one output should be shorted at a time.
NOTE 4: I
CC
is measured with all outputs open; CLR grounded, following momentary connection to 4.5 V, N, G
1, G2, and all data inputs grounded;
and CLK and M at 4.5 V.
timing requirements over recommended operating conditions (unless otherwise noted)
SN54LS173A SN74LS173A
UNIT
MIN MAX MIN MAX
UNIT
f
clock
Input clock frequency 30 25 MHz
t
w
Pulse duration CLK or CLR 25 25 ns
Data enable (G1, G2) 35 35
t
su
Setup time
Data 17 17
ns
CLR (inactive state) 10 10
t
h
Hold time
Data enable (G1, G2) 0 0
ns
t
h
Hold
time
Data 3 3
ns