TECHNICAL DATA
OCTAL D-TYPE FLIP-FLOP WITH CLEAR
Contains Eight Flip-Flops with Single-Rail Outputs
Buffered Clock and Direct Clear Inputs
Individual Data Input to Each Flip-Flop
Applications Include:
Buffer/Storage Registers
Shift Registers
Pattern Generators
DESCRIPTION
This monolithic, positive-edge-triggered flip-flop
utilizes TTL circuitry to implement D-type flip-flop
logic with a direct clear input.
Information at the D inputs meeting the setup time
requirements is transferred to the Q outputs on the
positive-going edge of the clock pulse. Clock
triggering occurs at a particular voltage level and is not
directly related to the transition time of the positive-
going pulse. When the clock inputs is at either the high
or low level, the D input signal has no effect at the
output.
The IN74ALS273 is characterized for operation from
0
o
C to 70
o
C.
ORDERING INFORMATION
IN74ALS273N Plastic
IN74ALS273DW SOIC
T
A
= 0
to 70
C for all
packages
Function Table and Logic Symbol
(each flip-flop)
INPUTS
OUTPUT
CLEAR
CLOCK
D
Q
L
H
H
H
X
I
I
L
X
H
L
X
L
H
L
Q
o
IN74ALS273
CLR
CLK
(1)
(18)
(11)
(3)
(4)
(7)
(17)
(8)
(13)
(14)
(2)
(5)
(6)
(9)
(12)
(15)
(16)
(19)
1D
2D
3D
4D
5D
6D
8Q
7D
8D
7Q
6Q
5Q
4Q
3Q
2Q
1Q
1D
R
C1
IN74ALS273
2
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR
TEMPERATURE RANGE
Supply voltage, Vcc
7V
Input voltage, Vl
7V
Operating free-air temperature range, TA
0
o
C to 70
o
C
Storage temperature range
-65
o
C to 150
o
C
RECOMMENDED OPERATING CONDITIONS
MIN
NOM MAX UNIT
V
CC
Supply voltage
4.5
5
5.5
V
V
IH
High-level input voltage
2
V
V
IL
Low-level input voltage
0.8
V
I
OH
High-level output current
-2.6
mA
I
OL
Low-level output current
24
mA
f
clock
Clock frequency
0
35
MHz
CLR low
10
t
W
Pulse duration CLK high
14
ns
CLK low
14
t
su
Setup time Data
10
ns
before CLKI Clear inactive state
15
ns
t
ly
Hold time, data after CLKI
0
ns
T
A
Operating free-air temperature
0
70
o
C
ELECTRICAL CHARACTERISTICS OVER RECOMMENDED OPERATING FREE-
AIR TEMPERATURE RANGE
Parameter
Test Conditions
MIN
TYP** MAX UNIT
V
IK
V
CC
= 4.5V
I
I
=-18mA
-1.5
V
V
OH
V
CC
= 4.5V to 5.5V
I
OH
=-0.4mA
V
CC
-2
V
V
CC
= 4.5V
I
OH
=-2.6mA
2.4
3.2
V
OL
V
CC
= 4.5V
I
OL
=12mA
0.25
0.4
V
I
OL
=24mA
0.35
0.5
V
I
I
V
CC
= 5.5V
V
I
=7V
0.1
mA
I
IH
V
CC
= 5.5V
V
I
=2.7V
20
A
I
IL
V
CC
= 5.5V
V
I
=0.4V
-0.2
mA
I
O
*
V
CC
= 5.5V
V
O
=2.25V
-30
-112
mA
I
CCH
V
CC
= 5.5V
11
20
mA
I
CCL
V
CC
= 5.5V
19
29
mA
*-The output conditions have been chosen to produce a current that closely approximates one half of the true
short-circuit output current, I
OS
**-All typical values are at V
CC
=5V, T
A
=25
o
C
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