dm74ls469 National Semiconductor Corporation, dm74ls469 Datasheet

dm74ls469

Manufacturer Part Number

dm74ls469

Description

8-bit Up/down Counter

Manufacturer

National Semiconductor Corporation

Datasheet

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C 1995 National Semiconductor Corporation

DM54LS469 DM74LS469 8-Bit Up Down Counter

General Description

The ‘LS469 is an 8-bit synchronous up down counter with

parallel load and hold capability Three function-select in-

puts (LD UD CBI) provide one of four operations which

occur synchronously on the rising edge of the clock (CK)

The LOAD operation loads the inputs (D

put register (Q

ous value regardless of clock transitions The INCREMENT

operation adds one to the output register when the carry-in

input is TRUE (CBI

HOLD The carry-out (CBO) is TRUE (CBO

the output register (Q

(CBO

from the output register when the borrow-in input is TRUE

(CBI

row-out (CBO) is TRUE (CBO

ister (Q

Connection Diagram

Function Table

TRI-STATE is a registered trademark of National Semiconductor Corp

LOW) otherwise the operation is a HOLD The bor-

HIGH) The DECREMENT operation subtracts one

– Q

See NS Package Number J24F or N24C

) is all LOWs otherwise FALSE (CBO

DM74LS469J or DM74LS469N

Order Number DM54LS469J

– Q

) The HOLD operation holds the previ-

LOW) otherwise the operation is a

– Q

Top View

) is all HIGHs otherwise FALSE

TL L 8333

LOW) when the output reg-

OE CK LD UD CBI D7 – D0

– D

) into the out-

LOW) when

TL L 8333 – 1

HIGH)

The output register (Q

and disabled (HI-Z) when OE is HIGH The output drivers

will sink the 24 mA required for many bus-interface stan-

dards Two or more ‘LS469 octal up down counters may be

cascaded to provide larger counters

Features Benefits

Standard Test Load

Q minus 1 DECREMENT

8-bit up down counter for microprogram-counter DMA

controller and general-purpose counting applications

8 bits matches byte boundaries

Bus-structured pinout

24-pin SKINNYDIP saves space

TRI-STATE outputs drive bus lines

Low current PNP inputs reduce loading

Expandable in 8-bit increments

Q plus 1

Q7 – Q0

INCREMENT

Operation

LOAD

HOLD

HI-Z

– Q

) is enabled when OE is LOW

RRD-B30M115 Printed in U S A

TL L 8333 – 3

July 1989

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dm74ls469 Summary of contents

Page 1

... DM54LS469 DM74LS469 8-Bit Up Down Counter General Description The ‘LS469 is an 8-bit synchronous up down counter with parallel load and hold capability Three function-select in- puts (LD UD CBI) provide one of four operations which occur synchronously on the rising edge of the clock (CK) The LOAD operation loads the inputs (D ...

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 V CC Input Voltage Operating Conditions Symbol Parameter V Supply Voltage CC T Operating Free-Air Temperature ...

Page 3

Logic Diagram LS469 TL L 8333 – ...

Page 4

... Physical Dimensions inches (millimeters) 24-Pin Narrow Ceramic Dual-In-Line Package (J) Order Number DM54LS469J or DM74LS469J 24-Pin Narrow Plastic Dual-In-Line Package (N) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL ...

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