74HC123D - Semiconductors - Dual retriggerable monostable multivibrator with reset

Quick Detail:

Dual retriggerable monostable multivibrator with reset

Description:

The 74HC/HCT123 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no.7A. The 74HC/HCT123 are dual retriggerable monostable multivibrators with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). The external resistor and capacitor are normally connected as shown in Fig.6.

Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By repeating this process, the output

pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired.

Alternatively an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering.

An internal connection from nRD to the input gates makes it possible to trigger the circuit by a positive-going signal at input nRD as shown in the function table. Figures 7 and 8 illustrate pulse control by retriggering and early reset. The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT. For pulse widths, when CEXT < 10 000 pF, see Fig.9.

When CEXT > 10 000 pF, the typical output pulse width is defined as:

tW = 0.45 × REXT × CEXT (typ.),

where:

tW = pulse width in ns;

REXT = external resistor in kΩ;

CEXT = external capacitor in pF.

Schmitt-trigger action in the nA and

nB inputs, makes the circuit highly tolerant to slower input rise and fall times.

The ‘123’ is identical to the ‘423’ but can be triggered via the reset input.

Applications:

• DC triggered from active HIGH or active LOW inputs

• Retriggerable for very long pulses up to 100% duty factor

• Direct reset terminates output pulse

• Schmitt-trigger action on all inputs except for the reset input

• Output capability: standard (except for nREXT/CEXT)

• ICC category: MSI

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