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DM74ALS169

更新时间： 2024-11-05 22:56:47

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		计数器
页数	文件大小	规格书
7页	72K
描述
Synchronous Four-Bit Up/Down Counters

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DM74ALS169 数据手册

April 1984

Revised April 2000

DM74ALS169B

Synchronous Four-Bit Up/Down Counters

General Description

Features

These synchronous presettable counters feature an inter-

nal carry look ahead for cascading in high speed counting

applications. The DM74ALS169B is a four-bit binary up/

down counter. The carry output is decoded to prevent

spikes during normal mode of counting operation. Synchro-

nous operation is provided so that outputs change coinci-

dent with each other when so instructed by count enable

inputs and internal gating. This mode of operation elimi-

nates the output counting spikes which are normally asso-

■ Switching specifications at 50 pF

■ Switching specifications guaranteed over full tempera-

ture and V_CCrange

■ Advanced oxide-isolated, ion-implanted Schottky TTL

process

■ Functionally and pin-for-pin compatible with Schottky

and low power Schottky TTL counterpart

■ Improved AC performance over Schottky and low power

Schottky counterparts

ciated with asynchronous (ripple clock) counters.

buffered clock input triggers the four flip-flops on the rising

(positive going) edge of clock input waveform.

■ Synchronously programmable

■ Internal look ahead for fast counting

■ Carry output for n-bit cascading

■ Synchronous counting

These counters are fully programmable; that is, the outputs

may each be preset either HIGH or LOW. The load input

circuitry allows loading with carry-enable output of cas-

caded counters. As loading is synchronous, setting up a

low level at the load input disables the counter and causes

the outputs to agree with the data inputs after the next

clock pulse.

■ ESD inputs

The carry look-ahead circuitry permits cascading counters

for n-bit synchronous applications without additional gating.

Both count enable inputs (P and T) must be LOW to count.

The direction of the count is determined by the level of the

up/down input. When the input is HIGH, the counter counts

UP; when LOW, it counts DOWN. Input T is fed forward to

enable the carry outputs. The carry output thus enabled will

produce a low level output pulse with a duration approxi-

mately equal to the high portion of the Q_Aoutput when

counting UP, and approximately equal to the low portion of

the Q_Awhen counting DOWN. This low level overflow carry

pulse can be used to enable successively cascaded

stages. Transitions at the enable P or T inputs are allowed

regardless of the level of the clock input.

The control functions for these counters are fully synchro-

nous. Changes at control inputs (enable P, enable T, load,

up/down) which modify the operating mode have no effect

until clocking occurs. The function of the counter (whether

enabled, disabled, loading or counting) will be dictated

solely by the conditions meeting the stable setup and hold

times.

Ordering Code:

Order Number Package Number

Package Description

DM74ALS169BM

DM74ALS169BN

M16A

N16E

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

DS006207

www.fairchildsemi.com

12 3 4 5 6 7

中文翻译

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与DM74ALS169相关器件

型号	品牌	获取价格	描述	数据表
DM74ALS169B	FAIRCHILD	获取价格	Synchronous Four-Bit Up/Down Counters
DM74ALS169BJ	TI	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,ALS-TTL,DIP,16PIN,CERAMIC
DM74ALS169BJ/A+	ETC	获取价格	Synchronous Up/Down Counter
DM74ALS169BM	ETC	获取价格	Synchronous Up/Down Counter
DM74ALS169BM/A+	ETC	获取价格	Synchronous Up/Down Counter
DM74ALS169BM/B+	ETC	获取价格	Synchronous Up/Down Counter
DM74ALS169BMX	FAIRCHILD	获取价格	Synchronous Up/Down Counter
DM74ALS169BMX	ROCHESTER	获取价格	Binary Counter, ALS Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, TT
DM74ALS169BMX	TI	获取价格	ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, 0.150
DM74ALS169BMX_NL	FAIRCHILD	获取价格	Binary Counter, ALS Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, TT

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