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National Semiconductor Electronic Components Datasheet

DM54LS503 Datasheet

8-Bit Successive Approximation Register

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April 1992
DM54LS503 DM74LS503
8-Bit Successive Approximation
Register (with Expansion Control)
General Description
The ’LS503 register is basically the same as the ’LS502
except that it has an active LOW Enable (E) input that is
used in cascading two or more packages for longer word
lengths A HIGH signal on E after a START operation
forces Q7 HIGH and prevents the device from accepting
serial data With the E input of an ’LS503 connected to the
CC output of a preceding (more significant) device the
’LS503 will be inhibited until the preceding device is filled
causing its CC output to go LOW This LOW signal then
enables the ’LS503 to accept the serial data on subsequent
clocks For a description of the starting shifting and conver-
sion operations please see the ’LS502 data sheet
Features
Y Performs serial-to-parallel conversion
Y Expansion control for longer words
Y Storage and control for successive approximation
A to D conversion
Y Low power Schottky version of 2503
Connection Diagram
Logic Symbol
Dual-In-Line Package
TL F 10190 – 1
Order Number DM54LS503J DM54LS503W
DM74LS503WM or DM74LS503N
See NS Package Number J16A M16B N16E or W16A
VCC e Pin 16
GND e Pin 8
Pin Names
D
S
CP
E
CC
Q0 – Q7
Q7
Description
Serial Data Input
Start Input (Active LOW)
Clock Pulse Input (Active Rising Edge)
Conversion Enable Input (Active LOW)
Conversion Complete Output (Active LOW)
Parallel Register Outputs
Complement of Q7 Output
TL F 10190 – 2
C1995 National Semiconductor Corporation TL F 10190
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

DM54LS503 Datasheet

8-Bit Successive Approximation Register

No Preview Available !

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
DM54LS
b55 C to a125 C
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
VCC
VIH
VIL
IOH
IOL
TA
ts (H)
ts (L)
th (H)
th (L)
ts (H)
ts (L)
th (H)
th (L)
tw (H)
tw (L)
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
Low Level Output Current
Free Air Operating Temperature
Setup Time HIGH or LOW
S to CP
Hold Time HIGH or LOW
S to CP
Setup Time HIGH or LOW
D to CP
Hold Time HIGH or LOW
D to CP
CP Pulse Width HIGH or LOW
Min
45
2
b55
5
5
5
5
5
5
5
5
20
20
DM54LS503
Nom
Max
5 55
07
b0 4
4
125
DM74LS503
Min Nom Max
4 75 5
5 25
2
08
b0 4
8
0 70
16
16
0
0
8
8
10
10
46
46
Units
V
V
V
mA
mA
C
ns
ns
ns
ns
ns
Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
VOH
Input Clamp Voltage
High Level Output Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max
DM54
DM74
25
27
VOL
Low Level Output Voltage
VCC e Min IOL e Max
DM54
VIH e Min
DM74
IOL e 4 mA VCC e Min
DM74
II
Input Current Max
VCC e Max VI e 7V
DM74
Input Voltage
VI e 10V
DM54
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)
DM54
DM74
b20
b20
ICC Supply Current
VCC e Max
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)
Max
b1 5
04
05
04
01
20
b0 8
b100
b100
65
Units
V
V
V
mA
mA
mA
mA
mA
2


Part Number DM54LS503
Description 8-Bit Successive Approximation Register
Maker National Semiconductor
Total Page 6 Pages
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