DM74LS469

更新时间： 2024-11-27 23:00:43

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		计数器
页数	文件大小	规格书
8页	147K
描述
8-Bit Up/Down Counter

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数据手册

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DM74LS469 数据手册

April 1998

DM74LS469

8-Bit Up/Down Counter

The output register (Q₇–Q₀) 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 standards.

Two or more ’LS469 octal up/down counters may be cas-

caded to provide larger counters.

General Description

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

parallel load and hold capability. Three function-select inputs

(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 (D₇–D₀) into the output

value regardless of clock transitions. The INCREMENT op-

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

Features/Benefits

n 8-bit up/down counter for microprogram-counter, DMA

controller and general-purpose counting applications

n 8 bits matches byte boundaries

put is TRUE (CBI LOW), otherwise the operation is a

n Bus-structured pinout

HOLD. The carry-out (CBO) is TRUE (CBO LOW) when

n 24-pin SKINNYDIP saves space

the output register (Q₇–Q₀) is all HIGHs, otherwise FALSE

(CBO HIGH). The DECREMENT operation subtracts one

n 3-STATE outputs drive bus lines

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

n Low current PNP inputs reduce loading

n Expandable in 8-bit increments

(CBI LOW), otherwise the operation is

a HOLD. The

borrow-out (CBO) is TRUE (CBO LOW) when the output

HIGH).

Connection Diagram

Standard Test Load

Top View

DS008333-3

DS008333-1

Order Number DM54LS469J,

DM74LS469J or DM74LS469N

See Package Number J24F or N24C

DS008333

www.fairchildsemi.com

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与DM74LS469相关器件

型号	品牌	获取价格	描述	数据表
DM74LS469AJ	ETC	获取价格	Synchronous Up/Down Counter
DM74LS469AN	ETC	获取价格	Synchronous Up/Down Counter
DM74LS469AV	ETC	获取价格	Register File
DM74LS469J	NSC	获取价格	DM54LS469/DM74LS469 8-Bit Up/Down Counter
DM74LS469J/A+	ETC	获取价格	Synchronous Up/Down Counter
DM74LS469J/B+	ETC	获取价格	Synchronous Up/Down Counter
DM74LS469N	NSC	获取价格	DM54LS469/DM74LS469 8-Bit Up/Down Counter
DM74LS469N/A+	ETC	获取价格	Synchronous Up/Down Counter
DM74LS469N/B+	ETC	获取价格	Synchronous Up/Down Counter
DM74LS47	FAIRCHILD	获取价格	BCD to 7-Segment Decoder/Driver with Open-Collector Outputs