Quick Detail:

16-Key Encoder 20-Key Encoder

Description:

The MM74C922 and MM74C923 CMOS key encoders provide all the necessary logic to fully encode an array of SPST switches. The keyboard scan can be implemented by either an external clock or external capacitor. These encoders also have on-chip pull-up devices which permit switches with up to 50 kΩ on resistance to be used. No diodes in the switch array are needed to eliminate ghost switches. The internal debounce circuit needs only a single external capacitor and can be defeated by omitting the capacitor. A Data Available output goes to a high level when a valid keyboard entry has been made. The Data

Available output returns to a low level when the entered key is released, even if another key is depressed. The Data Available will return high to indicate acceptance of the new key after a normal debounce period; this two-key roll-over is provided between any two switches.

An internal register remembers the last key pressed even after the key is released. The 3-STATE outputs provide for easy expansion and bus operation and are LPTTL compatible.

Applications:

■ 50 kΩ maximum switch on resistance

■ On or off chip clock

■ On-chip row pull-up devices

■ 2 key roll-over

■ Keybounce elimination with single capacitor

■ Last key register at outputs

■ 3-STATE output LPTTL compatible

■ Wide supply range: 3V to 15V

■ Low power consumption

Specifications:

Competitive Advantage:

Warranty :180 days !
Free shipping: Order over $1000 win a free shipment fee
(goods weight below 3Kg) ,during 20130901-20130930 .

Why buy from us >>> Fast / Safely / Conveniently

• Mega Source is a Stock keeper and trade company of Electronic components .Our branches office include China, Hong Kong, Sigapore , Canada . Offer business, service, resourcing and information for our global member.
• Goods are ensured the highest quality possible and are delivered to our customers all over the world with speed and precision.

How to buy >>>

• Contact us by email & sent your inquire with your Transport destination .
• Online chat, the commissioner would be responded ASAP.

Service >>>

• Forwarder Shipment to world-wide, DHL ,TNT ,UPS,FEDEX etc. buyer don`t need to worry about shipping problem
• We will try to respond as quickly as possible. But due to time zone difference, please allow up to 24 hours to get your mail replied. The products were tested by some devices or software, we ensure that there is no quality problems.
• We are committed to providing fast, convenient and safe transportation service to global buyer.

Mega Source Elec. Limited is a leading independent electronic components supplier and distributor since 2004.Mega Source Elec. Limited has been specialized in providing Original Equipment Manufacturers (OEMs) and Contract Electronic Manufacturers (CEMs) which is hard to find, obsolete and hot sales integrated circuits ,semiconductors,LCD displays,power bank ect.

With years’ development, we have had developed a complete electronic components supply and distribute system.
Through our importing and exporting of components all around the world, Mega Source Elec. Limited can quickly feedback and satisfy customers’ need.
Besides, we have had gained a great reputation in domestic and international market for our experience and market insight, as well as our up-front, proactive, and responsive approach to service, adequate inventory and unwavering commitment to quality.

How Mega Source Elec. Makes A Difference In The Distribution Of Electronic Components 

Quality                                                                 Inventory

At the heart of Mega Source Elec. lies a commitment       Mega Source Electronics stocks components are

to total customer satisfaction with a secure quality           ready to be shipped.

system .We have professional testing facilities and          Hard-to-find,obsolete and high demand integrated 

and experienced QC& engineering team.With advanced  circuit & LCD display ect. can be found by us.

equipment and experienced industry experts, Mega        

Source Elec. is committed to fulfilling the needs of

our customers .                                                                     

Team                                                           Price

Our sales representatives, customer service agents,       We offer the most competitive price for you ,

quality inspectors and component engineers strive to      saving your purchasing cost.

Speed                                                           Environmental

Mega Source Electronics has established a well-               Our service is in strict compliance with global

developed logistics system and global logistics network,    environmental regulations and standards. We

which guarantees our service is very quick, convenient     resolve to fulfill social responsibility and pay

and efficient. attention to environmental protection.

Perfessional expert/import documentation work            Franchised distributor  

MEGA SOURCE TEAM 

More than 50 staff are in MEGA SOURCE.We are always here to fulfill your electronic components needs.

MEGA SOURCE BANK INFORMATION

• BANK NAME: HSBC HONGKONG

BENEFICIARY'S NAME: MEGA SOURCE ELEC.LIMITED

ACCOUNT: 509 744454 838 

SWIFT CODE: HSBCHKHHHKH

BANK ADD: 1 Queen’s Road Central ,Hong Kong

• PAYPAL

ACCOUNT :sales1@megasourceel.com 

• WESTERN UNION

ACCOUNT:JIAXIN ZHONG (Given name: JIAXIN, Family name: ZHONG)JIAXIN ZHONG (Given name: JIAXIN, Family name: ZHONG)

TEL：86-755-83695299

ADDRESS：22B FuHongGe, FuXing Garden Building, FuXing Rd, FuTian Dist. Shenzhen 518033