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National Semiconductor Electronic Components Datasheet

DM54LS502 Datasheet

8-Bit Successive Approximation Register

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DM54LS502 pdf
April 1992
DM54LS502 DM74LS502
8-Bit Successive Approximation Register
General Description
The LS502 is an 8-bit register with the interstage logic nec-
essary to perform serial-to-parallel conversion and provide
an active LOW Conversion Complete (CC) signal coincident
with storage of the eighth bit An active LOW Start (S) input
performs synchronous initialization which forces Q7 LOW
and all other outputs HIGH Subsequent clocks shift this Q7
LOW signal downstream which simultaneously backfills the
register such that the first serial data (D input) bit is stored in
Q7 the second bit in Q6 the third in Q5 etc The serial
input data is also synchronized by an auxiliary flip-flop and
brought out on QD
Designed primarily for use in the successive approximation
technique for analog-to-digital conversion the LS502 can
also be used as a serial-to-parallel converter ring counter
and as the storage and control element in recursive digital
routines
Features
Y Low power Schottky version of 2502
Y Storage and control for successive approximation A to
D conversion
Y Performs serial-to-parallel conversion
Connection Diagram
Dual-In-Line Package
Logic Symbol
TL F 10189 – 1
Order Number DM54LS502J DM54LS502W
DM74LS502WM or DM74LS502N
See NS Package Number J16A M16B N16E or W16A
VCC e Pin 16
GND e Pin 8
Pin
Names
D
S
CP
QD
CC
Q0 – Q7
Q7
Description
Serial Data Input
Start Input (Active LOW)
Clock Pulse Input (Active Rising Edge)
Synchronized Serial Data Output
Conversion Complete Output (Active LOW)
Parallel Register Outputs
Complement of Q7 Output
TL F 10189 – 2
C1995 National Semiconductor Corporation TL F 10189
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

DM54LS502 Datasheet

8-Bit Successive Approximation Register

No Preview Available !

DM54LS502 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
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
Parameter
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)
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
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
DM54LS502
Nom
5
Max
55
07
b0 4
4
125
DM74LS502
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
Typ
Min (Note 1) Max Units
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
b1 5
V
V
VOL Low Level Output
Voltage
VCC Min IOL e Max
VIH e Min
DM54
DM74
04
05 V
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
04
01
20
b0 8
b100
b100
mA
mA
mA
mA
ICC Supply Current
VCC e Max
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Note more than one output should be shorted at a time and the duration should not exceed one second
65 mA
2


Part Number DM54LS502
Description 8-Bit Successive Approximation Register
Maker National Semiconductor
Total Page 6 Pages
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