SN74LS490

更新时间： 2024-11-29 12:56:23

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		计数器
页数	文件大小	规格书
5页	164K
描述
DUAL DECADE COUNTER

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数据手册

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SN74LS490 数据手册

SN54/74LS490

DUAL DECADE COUNTER

The SN54/74LS490 contains a pair of high-speed 4-stage ripple counters.

Each half of the SN54/74LS490 has individual Clock, Master Reset and Mas-

ter Set (Preset 9) inputs. Each section counts in the 8, 4, 2, 1 BCD code.

• Dual Version of SN54/74LS490

• Individual Asynchronous Clear and Preset to 9 for Each Counter

• Count Frequency — Typically 65 MHz

DUAL DECADE COUNTER

LOW POWER SCHOTTKY

• Input Clamp Diodes Limit High-Speed Termination Effects

CONNECTION DIAGRAM DIP (TOP VIEW)

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

PIN NAMES

LOADING (Note a)

D SUFFIX

SOIC

CASE 751B-03

HIGH

LOW

Master Set (Set to 9) Input

Master Reset

Clock Input (Active LOW Going Edge)

Counter Outputs (Note b)

0.5 U.L.

1.5 U.L.

10 U.L.

0.25 U.L.

1.5 U.L.

Q –Q

5 (2.5) U.L.

ORDERING INFORMATION

NOTES:

a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial

(74) Temperature Ranges.

SN54LSXXXJ

Ceramic

SN74LSXXXN Plastic

SN74LSXXXD SOIC

LOGIC DIAGRAM (ONE HALF SHOWN)

TRUTH TABLE

OUTPUTS

COUNT

FAST AND LS TTL DATA

5-563

12 3 4 5

中文翻译

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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