dm74ls461n National Semiconductor Corporation, dm74ls461n Datasheet

dm74ls461n

Manufacturer Part Number

dm74ls461n

Description

Octal Counter

Manufacturer

National Semiconductor Corporation

Datasheet

1.DM74LS461N.pdf (4 pages)

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C 1995 National Semiconductor Corporation

DM54LS461 DM74LS461 Octal Counter

General Description

The LS461 is an 8-bit synchronous counter with parallel

load clear and hold capability Two function select inputs

nously on the rising edge of the clock (CK)

The LOAD operation loads the inputs (D

put register (Q

put register to all LOWs The HOLD operation holds the

previous value regardless of clock transitions The INCRE-

MENT operation adds one to the output register when the

carry-in input is TRUE (CI

is a HOLD The carry-out (CO) is TRUE (CO

the output register (Q

(CO

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 stand-

ards

Connection Diagram

Function Table

TRI-STATE is a registered trademark of National Semiconductor Corp

) provide one of four operations which occur synchro-

HIGH)

See NS Package Number J24F or N24C

DM74LS461J or DM74LS461N

Order Number DM54LS461J

– Q

) The CLEAR operation resets the out-

– Q

Top View

) is all HIGHs otherwise FALSE

) is enabled when OE is LOW

LOW) otherwise the operation

TL L 8334

OE CK I1 I0 CI D7 – D0

– D

) into the out-

LOW) when

TL L 8334 – 1

Two or more LS461 octal counters may be cascaded to

provide larger counters The operation codes were chosen

such that when I

tween LOAD and INCREMENT as in a program counter

(JUMP INCREMENT)

Features Benefits

Standard Test Load

Octal counter for microprogram-counter DMA controller

and general purpose counting applications

8 bits match byte boundaries

Bus-structured pinout

24-pin Skinny Dip saves space

TRI-STATE outputs drive bus lines

Low current PNP inputs reduce loading

Expandable in 8-bit increments

Q plus 1 INCREMENT

Q7 – Q0

Operation

CLEAR

HOLD

LOAD

HOLD

HI-Z

is HIGH I

may be used to select be-

RRD-B30M115 Printed in U S A

TL L 8334 – 2

July 1989

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dm74ls461n Summary of contents

Page 1

... OE is HIGH The output drivers will sink the 24 mA required for many bus interface stand- ards Connection Diagram Top View Order Number DM54LS461J DM74LS461J or DM74LS461N See NS Package Number J24F or N24C Function Table – ...

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 LS461 8334 – 3 ...

Page 4

... 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 NS Package J24F Order Number DM74LS461N NS Package N24C 2 A critical component is any component of a life ...

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