74HC/HCT Octal D-type transparent latch;. 3-state. For a complete data sheet, please also download: • The IC06 74HC/HCT/HCU/HCMOS. The 74HC; 74HCT is a high-speed Si-gate CMOS device and is pin The 74HC; 74HCT has octal D-type transparent latches featuring separate. 74HCTN 74HC/HCT; Octal D-type Transparent Latch; 3-state;; Package: SOT (DIP20), Details, datasheet, quote on part number: 74HCTN.

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My belief is that turning on all 8 outputs at 20 ma exceeds the IC max current.

Sign up using Facebook. I’m hoping someone can help a noob out here. However, driving a LED at 20 mA is often unnecessary today. datasheeet

74HCTN PHILIPS 20P/DIP V無鉛

And that supply current is also the main part of the current that feeds outputs. As is stated in the below table the output max current is 35mA for each output, being the nominal current 20mA, enough to control a LED in every output. Nik Middleton 6 5. Would really appreciate some input. It would have been so simple to use a current drain driver but sadly it’s not an option.

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74HC573; 74HCT573 Octal D-type Transparent Latch; 3-state

Sign up using Email dztasheet Password. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. You can edit your question and then click on the icon that looks like a schematic symbol, and it will load the schematic editor.

I have no control over end devices. I’m loosing some voltage 4. I should have added that there are 2 LEDS being driven from each output.

Get on to your supplier and ask them to justify their thoughts.

Glad to know i’m not going nuts. Email Required, but never shown. The IC has a global limit of 70 mA. A simple indicator LED will be fine at 5 mA. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these datwsheet.

Hi, basic schematic added. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. My solution is to use P channel mosfets to switch the power. The load is between the IC and ground source current? My understanding is that is has a max of 35 mA per pin, but a total of 70 mA for the IC. Post as a guest Name.

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74HCTN Datasheet(PDF) – NXP Semiconductors

You should make sure that the design actually tries to do that. It’s not always LED’s but they are non inductive. Sign up or log in Sign up using Google. Q are dataeheet outputs and attach to equipment that requires 20 ma. You are not wrong. Home Questions Tags Users Unanswered.

Maybe you will be OK afterall, or maybe a simple part change can fix everything up.

This website has a built-in schematic editor. There is a ready made solution and the supplier insists it will be OK but having read the data sheet I don’t think it will. I’ve been reading a lot of data sheets of late looking for chips that will work for a small project. Data sheet is here: