2000 Fairchild Semiconductor Corporation
DS009815
www.fairchildsemi.com
March 1988
Revised March 2000
DM74LS574
Octa
l D-T
ype Fli
p
-Fl
op w
i
t
h
3-
ST
A
T
E O
u
tput
s
DM74LS574
Octal D-Type Flip-Flop with 3-STATE Outputs
General Description
The DM74LS574 is a high speed low power octal flip-flop
with a buffered common Clock (CP) and a buffered com-
mon Output Enable (OE). The information presented to the
D inputs is stored in the flip-flops on the LOW-to-HIGH
Clock (CP) transition.
This device is functionally identical to the DM74LS374
except for the pinouts.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Logic Symbol
V
CC
=
Pin 20
GND
=
Pin 10
Connection Diagram
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
=
HIGH-to-LOW Clock (CP) transition
Order Number
Package Number Package Description
DM74LS574WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS574N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Outputs
Dn
CP
OE
On
H
L
H
L
L
L
X
X
H
Z
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2
DM74LS574
Functional Description
The DM74LS574 consists of eight edge-triggered flip-flops
with individual D-type inputs and 3-STATE true outputs.
The buffered clock and buffered Outputs Enable are com-
mon to all flip-flops. The eight flip-flops will store the state
of their individual D inputs that meet the setup and hold
times requirements on the LOW-to-HIGH Clock (CP) tran-
sition. With the Output Enable (OE) LOW, the contents of
the eight flip-flops are available at the outputs. When the
OE is HIGH, the outputs go to the high impedance state.
Operation of the OE input does not affect the state of the
flip-flops.
Logic Diagram
3
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DM74LS574
Absolute Maximum Ratings
(Note 1)
Note 1: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define the conditions
for actual device operation.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 2: All typicals are at V
CC
=
5V, T
A
=
25
C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 4: I
CC
is measured with the DATA inputs grounded and the OUTPUT CONTROLS at 4.5V.
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
0
C to
+
70
C
Storage Temperature Range
-
65
C to
+
150
C
Symbol
Parameter
Min
Nom
Max
Units
V
CC
Supply Voltage
4.75
5
5.25
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
T
A
Free Air Operating Temperature
0
70
C
t
S
(H)
Setup Time HIGH or LOW
20
ns
t
S
(L)
Dn to CP
20
t
H
(H)
Hold Time HIGH or LOW
0
ns
t
H
(L)
Dn to CP
0
t
W
(H)
CP Pulse Width
15
ns
t
W
(L)
HIGH or LOW
15
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
18 mA
-
1.5
V
V
OH
HIGH Level
V
CC
=
Min, I
OH
=
Max,
2.4
3.3
V
Output Voltage
V
IL
=
Max, V
IH
=
Min
V
OL
LOW Level
V
CC
=
Min, I
OL
=
Max,
0.35
0.5
Output Voltage
V
IL
=
Max, V
IH
=
Min
V
I
OL
=
12 mA, V
CC
=
Min
0.25
0.4
I
I
Input Current @ Max Input Voltage
V
CC
=
Max, V
I
=
7V
0.1
mA
I
IH
HIGH Level Input Current
V
CC
=
Max, V
I
=
2.7V
20
A
I
IL
LOW Level Input Current
V
CC
=
Max, V
I
=
0.4V
-
400
A
I
OZH
OFF-State Output Current with
V
CC
=
Max, V
O
=
2.4V
20
A
HIGH Level Output Voltage Applied
V
IH
=
Min, V
IL
=
Max
I
OZL
OFF-State Output Current with
V
CC
=
Max, V
O
=
0.4V
-
20
A
LOW Level Output Voltage Applied
V
IH
=
Min, V
IL
=
Max
I
OS
Short Circuit Output Current (Note 3)
V
CC
=
Max
-
30
-
130
mA
I
CC
Supply Current
V
CC
=
Max (Note 4)
45
mA
5
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DM74LS574
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
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