DM74LS534 Octal D-Type Flip-Flop with 3-STATE Outputs
March 1989
Revised March 2000
DM74LS534
Octal D-Type Flip-Flop with 3-STATE Outputs
General Description
The DM74LS534 is a high speed, low power octal D-type
flip-flop featuring separate D-type inputs for each flip-flop
and 3-STATE outputs for bus oriented applications. A buff-
ered Clock (CP) and Output Enable (OE) is common to all
flip-flops. The DM74LS534 is the same as the DM74LS374
except that the outputs are inverted.
Ordering Code:
Order Number
DM74LS534N
Package Number
N20A
Package Description
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Logic Symbol
Connection Diagram
V
CC
=
Pin 20
GND
=
Pin 10
Pin Descriptions
Pin Name
D0–D7
CP
OE
O0–O7
Data Inputs
Clock Pulse Input (Active Rising Edge)
3-STATE Output Enable Input (Active LOW)
Complementary 3-STATE Outputs
Description
Truth Table
Inputs
D
n
H
L
X
CP
Outputs
X
OE
L
L
H
O
n
L
H
Z
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
=
LOW-to-HIGH Clock (CP) transistion
© 2000 Fairchild Semiconductor Corporation
DS009812
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DM74LS534
Functional Description
The DM74LS534 consists of eight edge-triggered flip-flops
with individual D-type inputs and 3-STATE true outputs.
The buffered clock and buffered Output 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-
sistion. 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
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2
DM74LS534
Absolute Maximum Ratings
(Note 1)
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
7V
0°C to
+70°C
−65°C
to
+150°C
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
Symbol
V
CC
V
IH
V
IL
V
OH
I
OL
T
A
t
S
(H)
t
S
(L)
t
H
(H)
t
H
(L)
t
W
(H)
t
W
(L)
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
Setup Time HIGH or LOW
D
n
to CP
Hold Time HIGH or LOW
D
n
to CP
CP Pulse Width HIGH or LOW
0
20
20
0
0
15
15
Parameter
Min
4.75
2
0.8
−2.6
24
70
Nom
5
Max
5.25
Units
V
V
V
mA
mA
°C
ns
ns
ns
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
V
I
V
OH
V
OL
Parameter
Input Clamp Voltage
HIGH Level
Output Voltage
LOW Level
Output Voltage
I
I
I
IH
I
IL
I
OZH
I
OZL
I
OS
I
CC
Input Current @ Max Input Voltage
HIGH Level Input Current
LOW Level Input Current
Off-State Output Current with
HIGH Level Output Voltage Applied
Off-State Output Current with
LOW Level Output Voltage Applied
Short Circuit Output Current
Supply Current
Conditions
V
CC
=
Min, I
I
= −18
mA
V
CC
=
Min, I
OH
=
Max
V
IL
=
Max V
IH
=
Min
V
CC
=
Min, I
OL
=
Max
V
IL
=
Max, V
IH
=
Min
I
OL
=
12 mA, V
CC
=
Min
V
CC
=
Max, V
I
=
7V
V
CC
=
Max, V
I
=
2.7V
V
CC
=
Max, V
I
=
0.5V
V
CC
=
Max, V
O
=
2.4V
V
IH
=
Min, V
IL
=
Max
V
CC
=
Max, V
O
=
0.4V
V
IH
=
Min, V
IL
=
Max
V
CC
=
Max (Note 3)
V
CC
=
Max (Note 4)
−20
45
2.4
3.3
0.35
0.25
0.5
0.4
0.1
20
−400
20
−20
−100
mA
µA
µA
µA
µA
mA
mA
Min
Typ
(Note 2)
Max
−1.5
Units
V
V
V
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.
3
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DM74LS534
Switching Characteristics
V
CC
= +5.0V,
T
A
= +25°C
Symbol
f
MAX
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Output Disable Time
Parameter
Maximum Clock Frequency
Propagation Delay
CP to Q
n
Output Enable Time
R
L
=
2 kΩ, C
L
=
45 pF
Min
35
28
28
28
28
20
25
Max
Units
MHz
ns
ns
ns
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4
DM74LS534 Octal D-Type Flip-Flop with 3-STATE Outputs
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N20A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
5
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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