Datasheet
SN54273, SN54LS273, SN74273, SN74LS273
OCTAL D-TYPE FLIP-FLOP WITH CLEAR
SDLS090 – OCTOBER 1976 – REVISED MARCH 1988
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
†
SN54LS273 SN74LS273
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
= –400 µA
2.5 3.4 2.7 3.4 V
V
OL
Low level out
p
ut voltage
V
CC
= MIN, V
IH
= 2 V,
I
OL
= 4 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
= V
IL
max,
IH
,
I
OL
= 8 mA 0.35 0.5
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 –20 –100 –20 –100 mA
I
CC
Supply current V
CC
= MAX, See Note 2 17 27 17 27 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 and duration of short circuit should not exceed one second.
NOTE 2: With all outputs open and 4.5 V applied to all data and clear inputs, I
CC
is measured after a momentary ground, then 4.5 V, is applied
to clock.
switching characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
f
max
Maximum clock frequency
C
30 40 MHz
t
PHL
Propagation delay time, high-to-low-level output from clear
C
L
= 15 pF,
R
L
=2kΩ
18 27 ns
t
PLH
Propagation delay time, low-to-high-level output from clock
R
L
=
2
kΩ
,
See Note 3
17 27 ns
t
PHL
Propagation delay time, high-to-low-level output from clock
See
Note
3
18 27 ns
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.