DM54LS502 National Semiconductor, DM54LS502 Datasheet

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DM54LS502

Manufacturer Part Number
DM54LS502
Description
8-Bit Successive Approximation Register
Manufacturer
National Semiconductor
Datasheet

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Part Number:
DM54LS502J/883
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C 1995 National Semiconductor Corporation
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 Q
Connection Diagram
See NS Package Number J16A M16B N16E or W16A
Order Number DM54LS502J DM54LS502W
DM74LS502WM or DM74LS502N
D
Dual-In-Line Package
TL F 10189
D
S
CP
Q
CC
Q0–Q7
Q7
Names
D
Pin
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– 1
Description
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
Y
Y
Logic Symbol
Low power Schottky version of 2502
Storage and control for successive approximation A to
D conversion
Performs serial-to-parallel conversion
V
GND
CC
e
e
Pin 16
Pin 8
RRD-B30M105 Printed in U S A
TL F 10189– 2
April 1992

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DM54LS502 Summary of contents

Page 1

... 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 Connection Diagram Dual-In-Line Package Order Number DM54LS502J DM54LS502W DM74LS502WM or DM74LS502N See NS Package Number J16A M16B N16E or W16A Pin Names D ...

Page 2

... The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation 125 150 C a DM54LS502 Min Nom Max ...

Page 3

... When the conversion is completed at t9 the binary number represented by the register outputs will be the numerator of the fraction n 256 representing the analog input voltage as a fraction of the full scale output D A converter DM54LS502 Min Max 25 ...

Page 4

Truth Table Inputs Time ...

Page 5

... Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) 16-Lead Wide Small Outline Molded Package (M) Order Number DM54LS502J NS Package Number J16A Order Number DM74LS502WM NS Package Number M16B 5 ...

Page 6

... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Order Number DM74LS502N NS Package Number N16E Order Number DM54LS502W NS Package Number W16A 2 A critical component is any component of a life ...

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