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DM74LS573 Octal D Latch with TRI-STATE(RM) Outputs
June 1992
DM74LS573
Octal D Latch with TRI-STATE
É
Outputs
General Description
The 'LS573 is a high speed octal latch with buffered com-
mon
Lat
ch Enable (LE) and buffered common Output En-
able (OE) inputs.
This device is functionally identical to the 'LS373, but has
different pinouts. For truth tables, discussion of operations
and AC and DC specifications, please refer to the 'LS373
data sheet.
Features
Y
Inputs and outputs on opposite sides of package
allowing easy interface with microprocessors
Y
Useful as input or output port for microprocessors
Y
Functionally identical to 'LS373
Y
Input clamp diodes limit high speed termination effects
Y
Fully TTL and CMOS compatible
Connection Diagram
Logic Symbol
Dual-In-Line Package
TL/F/9814±2
V
CC
e
Pin 20
GND
e
Pin 10
TL/F/9814±1
Order Number DM74LS573WM or DM74LS573N
See NS Package Number M20B or N20A
Pin Names
Description
D0±D7 Data Inputs
LE
Latch Enable Input (Active HIGH)
OE TRI-STATE Output Enable Input (Active LOW)
O0±O7 TRI-STATE Latch Outputs
Function Table
OUTPUT
Latch
D
Ou
tp
ut
Enable
Enable
O
L
H
H
H
L
H
L
L
L
L
X
Q
O
H
X
X
Z
L
e
Low State, H
e
High State, X
e
Don't Care
Z
e
High Impedance State
Q
O
e
Previous Condition of O
TRI-STATE
É
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/9814
RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
(Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
7V
Note: The ``AbsoluteMaximumRatings'' are those values
beyondwhich the safety of thedevice cannot be guaran-
teed.Thedeviceshouldnotbeoperatedattheselimits.The
parametricvaluesdefinedinthe``ElectricalCharacteristics''
tablearenotguaranteedattheabsolutemaximumratings.
The``RecommendedOperatingConditions''tablewilldefine
theconditionsforactualdeviceoperation.
Input Voltage
7V
Operating Free Air Temperature Range
DM74LS
0
§
Cto
a
70
§
C
Storage Temperature Range
b
65
§
Cto
a
150
§
C
Recommended Operating Conditions
Symbol
Parameter
DM74LS
Units
Min
Nom
Max
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 Input Current
b
2.6
mA
I
OL
Low Level Output Current
24
mA
T
A
Free Air Operating Temperature
0
70
§
C
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max Units
(Note 1)
V
I
Input Clamp Voltage
V
CC
e
Min, I
I
eb
18 mA
b
1.5
V
V
OH
High Level Output
V
CC
e
Min, I
OH
e
Max,
2.7
3.4
V
Voltage
V
IL
e
Max
V
OL
Low Level Output
V
CC
e
Min, I
OL
e
Max,
0.35
0.5
Voltage
V
IH
e
Min
V
I
OL
e
4 mA, V
CC
e
Min
0.25
0.4
I
I
Input Current
@
Max
V
CC
e
Max, V
I
e
7V
1
mA
Input Voltage
I
IH
High Level Input Current V
CC
e
Max, V
I
e
2.7V
20
m
A
I
IL
Low Level Input Current V
CC
e
Max, V
I
e
0.4V
b
0.4 mA
I
OS
Short Circuit
V
CC
e
Max
b
30
b
130 mA
Output Current
(Note 2)
I
CC
Supply Current
V
CC
e
Max
50
mA
I
OZH
TRI-STATE Output
V
CC
e
V
CCH
20
m
A
off Current High
V
OZH
e
2.7V
I
OZL
TRI-STATE Output
V
CC
e
V
CCH
b
20
m
A
off Current Low
V
OZL
e
0.4V
Note 1: All typicals are at V
CC
e
5V, T
A
e
25
§
C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
2
Switching Characteristics
at V
CC
e
5V and T
A
e
25
§
C (see Section 1 for Test Waveforms and output loading)
R
L
e
2k
X
,
Symbol
Parameter
C
L
e
50 pF
Units
Min
Max
t
PLH
Propagation Delay
27
ns
t
PHL
Data to Q
18
t
PLH
Propagation Delay
36
ns
t
PHL
LE to Q
25
t
PZH
TR
I-STATE Enable Time
20
ns
t
PZL
OE to Q
25
t
PHZ
TR
I-STATE Enable Time
20
ns
t
PLZ
OE to Q
25
t
s
(H)
Setup Time (High/Low)
3
ns
t
s
(L)
Data to LE
7
t
h
(H)
Hold Time (High/Low)
10
ns
t
h
(L)
Data to LE
10
t
w
(H)
Pulse Width (High)
15
ns
Data to LE
Physical Dimensions
inches (millimeters)
20-Lead Wide Small Outline Molded Package (M)
Order Number DM74LS573WM
NS Package Number M20B
3
Physical Dimensions
inches (millimeters) (Continued)
20-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS573N
NS Package Number N20A
LIFE SUPPORT POLICY
NATIONAL'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 NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant
support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose
be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance
support device or system, or to affect its safety or
with instructions for use provided in the labeling, can
effectiveness.
be reasonably expected to result in a significant injury
to the user.
National Semiconductor
National Semiconductor
National Semiconductor
National Semiconductor
Corporation
Europe
Hong Kong Ltd.
Japan Ltd.
1111 West Bardin Road
Fax: (
a
49) 0-180-530 85 86
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