DM74LS461

更新时间： 2024-11-27 23:00:43

品牌	Logo	应用领域
美国国家半导体 - NSC		计数器
页数	文件大小	规格书
4页	123K
描述
Octal Counter

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数据手册

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DM74LS461 数据手册

July 1989

DM54LS461/DM74LS461 Octal Counter

General Description

The LS461 is an 8-bit synchronous counter with parallel

Two or more LS461 octal counters may be cascaded to

provide larger counters. The operation codes were chosen

load, clear, and hold capability. Two function select inputs

(I , I ) provide one of four operations which occur synchro-

such that when I is HIGH, I may be used to select be-

1 0

tween LOAD and INCREMENT as in a program counter

(JUMP/INCREMENT).

nously on the rising edge of the clock (CK).

The LOAD operation loads the inputs (D –D ) into the out-

put register (Q –Q ). The CLEAR operation resets the out-

Features/Benefits

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

Octal counter for microprogram-counter, DMA controller

and general purpose counting applications

carry-in input is TRUE (CI

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

the output register (Q –Q ) is all HIGHs, otherwise FALSE

LOW), otherwise the operation

8 bits match byte boundaries

LOW) when

Bus-structured pinout

24-pin Skinny Dip saves space

(CO

HIGH).

TRI-STATE outputs drive bus lines

Low current PNP inputs reduce loading

The output register (Q –Q ) is enabled when OE is LOW,

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

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

ards.

Expandable in 8-bit increments

Connection Diagram

Standard Test Load

Top View

TL/L/8334–2

TL/L/8334–1

Order Number DM54LS461J,

DM74LS461J or DM74LS461N

See NS Package Number J24F or N24C

Function Table

OE CK I1 I0 CI D7–D0 Q7–Q0

Operation

HI-Z

CLEAR

HOLD

LOAD

HOLD

Q plus 1 INCREMENT

TRI-STATEÉ is a registered trademark of National Semiconductor Corp.

1995 National Semiconductor Corporation

TL/L/8334

RRD-B30M115/Printed in U. S. A.

12 3 4

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与DM74LS461相关器件

型号	品牌	获取价格	描述	数据表
DM74LS461AJ	ETC	获取价格	Synchronous Up Counter
DM74LS461AN	ETC	获取价格	Synchronous Up Counter
DM74LS461AV	ETC	获取价格	Synchronous Up Counter
DM74LS461J	NSC	获取价格	Octal Counter
DM74LS461J/A+	ETC	获取价格	Synchronous Up Counter
DM74LS461J/B+	ETC	获取价格	Synchronous Up Counter
DM74LS461N	NSC	获取价格	Octal Counter
DM74LS461N/A+	ETC	获取价格	Synchronous Up Counter
DM74LS461N/B+	ETC	获取价格	Synchronous Up Counter
DM74LS465	NSC	获取价格	TRI-STATE Octal Buffer