SN74LS490

更新时间： 2024-11-29 05:04:47

品牌	Logo	应用领域
德州仪器 - TI		计数器
页数	文件大小	规格书
8页	141K
描述
DUAL 4-BIT DECADE COUNTERS

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SN74LS490 数据手册

SN54LS490, SN74LS490

DUAL 4-BIT DECADE COUNTERS

SDLS125A – OCTOBER 1976 – REVISED JULY 1998

SN54LS490 . . . J OR W PACKAGE

SN74LS490 . . . D OR N PACKAGE

(TOP VIEW)

Dual Versions of the SN54LS90 and

SN74LS90 Counters

Individual Clock, Direct Clear, and Set-to-9

Inputs for Each Decade Counter

1CLK

1CLR

2CLK

2CLR

Dual Counters Can Significantly Improve

System Densities as Package Count Can

Be Reduced by 50%

1SET9

2SET9

Maximum Count Frequency of

25 MHz . . . 35 MHz Typical

Buffered Outputs Reduce Possibility of

Collector Commutation

GND

Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Flat

(W) Packages, Ceramic Chip Carriers (FK),

and Standard Plastic (N) and Ceramic (J)

DIPs

SN54LS490 . . . FK PACKAGE

(TOP VIEW)

description

1 20 19

2CLR

Each of these monolithic circuits contains eight

master-slave flip-flops and additional gating to

implement two individual 4-bit decade counters in

a single package. Each decade counter has

individual clock (1CLK, 2CLK), clear (1CLR,

2CLR), and set-to-9 (1SET9, 2SET9) inputs. BCD

count sequences of any length up to

divide-by-100 can be implemented with a single

’LS490 device. Buffering on each output is

provided to significantly reduce susceptibility to

collector commutation. All inputs are diode

clamped to reduce the effects of line ringing. The

counters have parallel outputs from each counter

stage so that submultiples of the input count

frequency are available for system timing signals.

1SET9

2SET9

9 10 11 12 13

NC – No internal connection

The SN54LS490 is characterized for operation over the full military temperature range of –55°C to 125°C.

The SN74LS490 is characterized for use in industrial systems operating from 0°C to 70°C.

CLEAR/SET-TO-9 FUNCTION TABLE

(each counter)

INPUTS

OUTPUTS

CLR SET9

Count

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7 8

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与SN74LS490相关器件

型号	品牌	获取价格	描述	数据表
SN74LS490D	MOTOROLA	获取价格	DUAL DECADE COUNTER
SN74LS490FN	TI	获取价格	LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, PQCC20
SN74LS490J	TI	获取价格	LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CDIP16, CERAMIC, DIP-16
SN74LS490J	MOTOROLA	获取价格	Decade Counter, Asynchronous, Up Direction, TTL, CDIP16
SN74LS490JDS	MOTOROLA	获取价格	LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CDIP16, CERAMIC, DIP-16
SN74LS490JP4	TI	获取价格	IC IC,COUNTER,UP,DECADE,LS-TTL,DIP,16PIN,CERAMIC, Counter
SN74LS490JS	MOTOROLA	获取价格	Decade Counter, LS Series, Asynchronous, Negative Edge Triggered, 4-Bit, Up Direction, TTL
SN74LS490N	MOTOROLA	获取价格	DUAL DECADE COUNTER
SN74LS490N3	TI	获取价格	IC IC,COUNTER,UP,DECADE,LS-TTL,DIP,16PIN,PLASTIC, Counter
SN74LS490NDS	MOTOROLA	获取价格	LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, PDIP16, PLASTIC, DIP-16

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