DM74LS502N NSC [National Semiconductor], DM74LS502N Datasheet

DM74LS502N

Manufacturer Part Number

DM74LS502N

Description

8-Bit Successive Approximation Register

Manufacturer

NSC [National Semiconductor]

Datasheet

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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

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

Dual-In-Line Package

TL F 10189

Q0–Q7

Names

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

Logic Symbol

Low power Schottky version of 2502

Storage and control for successive approximation A to

D conversion

Performs serial-to-parallel conversion

GND

Pin 16

Pin 8

RRD-B30M105 Printed in U S A

TL F 10189– 2

April 1992

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DM74LS502N 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 ...

Page 2

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Operating Free Air Temperature Range DM54LS b DM74LS Storage Temperature Range b Recommended Operating ...

Page 3

Switching Characteristics Symbol Parameter f Maximum Clock Frequency max t Propagation Delay PLH PHL n Functional Description The register stages are composed of transparent RS latch- es arranged in master slave pairs The master ...

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

... Fran ais Tel ( Italiano 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 ...

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