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National Semiconductor Electronic Components Datasheet


74573

Octal D Latch


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74573 pdf
June 1992
DM74LS573
Octal D Latch with TRI-STATE Outputs
General Description
The ’LS573 is a high speed octal latch with buffered com-
mon Latch Enable (LE) and buffered common Output En-
able (OE) inputs
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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
VCC e Pin 20
GND e Pin 10
TL F 9814 – 2
TL F 9814 – 1
Order Number DM74LS573WM or DM74LS573N
See NS Package Number M20B or N20A
Pin Names
Description
D0 – D7
LE
OE
O0 – O7
Data Inputs
Latch Enable Input (Active HIGH)
TRI-STATE Output Enable Input (Active LOW)
TRI-STATE Latch Outputs
Function Table
OUTPUT
Enable
Latch
Enable
D
L HH
L HL
L LX
H XX
L e Low State H e High State X e Don’t Care
Z e High Impedance State
QO e Previous Condition of O
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9814
Output
O
H
L
QO
Z
RRD-B30M115 Printed in U S A



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74573 pdf
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
Input Voltage
7V
Operating Free Air Temperature Range
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table 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
www.DataSheet4U.comVCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Output Current
Free Air Operating Temperature
Min
4 75
2
0
DM74LS
Nom
5
Max
5 25
08
b2 6
24
70
Units
V
V
V
mA
mA
C
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
VOH
VOL
II
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Current Max
Input Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max
VCC e Min IOL e Max
VIH e Min
IOL e 4 mA VCC e Min
VCC e Max VI e 7V
27
IIH
High Level Input Current
VCC e Max VI e 2 7V
IIL
Low Level Input Current
VCC e Max VI e 0 4V
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
b30
ICC Supply Current
VCC e Max
IOZH
TRI-STATE Output
off Current High
VCC e VCCH
VOZH e 2 7V
IOZL
TRI-STATE Output
off Current Low
VCC e VCCH
VOZL e 0 4V
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
Typ
(Note 1)
34
0 35
0 25
Max
b1 5
05
04
1
20
b0 4
b130
50
20
b20
Units
V
V
V
mA
mA
mA
mA
mA
mA
mA
2



Part Number 74573
Description Octal D Latch
Maker national - national
Total Page 4 Pages
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