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MC4044P.
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Product Manufacturers Pack D/C
MC4044P. - - -

Pinout/Connection Diagram

mc4044p. Circuit
Uses 4-MHz crystal in oscillator, with voltage-variable capacitor VVC in parallel with fixed and variable capacitors for setting frequency precisely. Varicap or silicon diode can also be used for VVC. Control voltage for WC is developed by Motorola MC4044P phase-frequency detector and associated MPSA20 amplifier and filter. 7473 and 7490 ICs divide 4-MHz signal by 4 and then by 10 to give 100 kHz. Main output can be further divided with additional 7490s, down to 60 Hz for driving electric clock if desired. Adjust C3 and R1 for symmetrical square wave at pin 1 of MC4044P, with clean leading and trailing edges. Typical values are 68 pF for C3 and 300K for R1, but values will depend on transistors used. Transistor types are not critical. Gates U2B and U2C with Q3 form lock indicator circuit that turns on LED when 4-MHz oscillator is phase-locked to output of external high-stability 100-kHz frequency standard. U1 and U2 are SN7400.-C. A. Harvey, How to Improve the Accuracy of Your Frequency Counter, Ham Radio, Oct. 1977, p 26-28.

Supplier

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  Part Number Mfg Pack D/C Qty Note
MC4044P. MOT n/a 84+ 65
  Advanced Technology Marketing Inc United States
Contact: Mr. Jim Perrotti   Tel: 1-407-859-0127 Fax:
MC4000 . DIP-18 15000 New and original sample can be provided
  UNION TECHNOLOGY (HK) TRADING COMPANY LIMITED China (Mainland)
Contact: Mr. Kevin   MSN:union-hk@live.com Tel: 0086-755-82813231/ 82813232 Fax: 0086-755-82813230
MC4000A DIP 2005+ 1000
  free components.Co.ltd China (Mainland)
Contact: Ms. lucky   MSN:sales3@freeicforum.com Tel: 86-755-82029661 Fax: 86-755-83005324
MC4000A MOTOLORA DIP 2 06+
  Edian Electronics Company China (Mainland)
Contact: Ms. cheung trammy   MSN:focosales@hotmail.com Tel: 86-755-82521939,23815519,83230734 Fax: 86-755-23815519
MC4000A MOT DIP 82 398
  Antech Electronic ( HK ) CO.,Limited China (Mainland)
Contact: Ms. Handy Chen   MSN:antech-sales1@hotmail.com Tel: 86-0755-82725725 Fax: 86-0755-82725726
MC4000A 25 MOT DIP18
  WinDigital Technology Development Limited Hong Kong
Contact: Mr. Eric   MSN:IC-TOWN@hotmail.com Tel: 0086-0755-83015852 Fax:
MC4000A MOT DIP 82 398 New original IN STOCK
  HK Kingrav Electronic Company China (Mainland)
Contact: Ms. Yang   MSN:helen@kingrav.com Tel: 86-755-82541122 Fax: 86-755-82541522
MC4000A MOTOLORA DIP 06+ 2
  ANTECH ENTERPRISE LIMITED China (Mainland)
Contact: Ms. Christina Cheung   MSN:christina-cheung@hotmail.com Tel: 86-0755-82767565 Fax: 86-0755-23816815
MC4000A DIP 2000 can ship today
  Kinko Internationl Electronics Limited Hong Kong
Contact: Mr. Chris   MSN:kinko.sub@163.com Tel: 00-852-3759 0688 Fax: 00-3759 0688-3759 0689
MC4000A MOT DIP 133 New and original -18
  ANP Technology (HK) Co., Ltd Hong Kong
Contact: Mr. Starbuck   MSN:starbuck3717@yahoo.com.cn Tel: 86-0755-82543553 Fax:
MC4000A N/A DIP 100PCS
  Hongkong Kaiyuwei Trading Company China (Mainland)
Contact: Ms. Lisa   MSN:lisa.kyw@hotmail.com Tel: 86-755-36931142 Fax: 86-755-83869906
MC4000A 10+ 1500
  SUPER-COMPONENTS LIMITED Hong Kong
Contact: Ms. Lotus   MSN:super-components@hotmail.com Tel: 86-852-3068-4088 Fax: 86-852-3068-4328
MC4000A MMMMMM DIP 87+ 1300
  YXS TECHNOLOGY.,LIMITED China (Mainland)
Contact: Ms. rinka   MSN:jack@ic-yxs.com Tel: +86-0755-83973711 Fax: +86-0755-83976992
MC4000A MOT DIP 82 398
  tengying elctronics ltd China (Mainland)
Contact: Ms. linda   MSN:shujy1984@hotmail.com Tel: 86-755-26767262 Fax: 86-755-26767262
MC4000A 2022
  Union-technilogy Development Ltd China (Mainland)
Contact: Mr. Cindy/Daniel   MSN:union-tech4@hotmail.com Tel: 86-755-82567470 Fax: 86-755-82567448
MC4000A MOT DIP 9450
  Golden Source Electronics Intl Limited China (Mainland)
Contact: Ms. sara   MSN:incomponent@hotmail.com Tel: 86-0755-83005325 Fax: 86-0755-83005322
MC4000A MOT DIP 09+ 5800
  HONG KONG TECH-GREEN ELECTRONICS CO。， LIMITED China (Mainland)
Contact: Ms. jenny   MSN:jenny-techgreen@hotmail.com Tel: 86-755-82853244 Fax: 86-755-82853242
MC4000A DIP MOT 82 398
  Nuoxinyuan Electronics(HK)Co,Ltd. China (Mainland)
Contact: Mr. Peter   MSN:peterpi1@live.cn Tel: 86-0755-83957733-8046 Fax: 86-0755-83956848
MC4000A MOTO DIP 11250 In-Stock
  Kinglead International Trading Limited China (Mainland)
Contact: Ms. Melody Wu   MSN:sales6@kinglead.com Tel: 86-0755-88837711 Fax: 86-0755-28526941
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PDF / Datasheet

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