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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The load is between the IC and ground source current?
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. My understanding is that is has a max of 35 mA per pin, but a total of 70 mA for the IC.
74HC573; 74HCT573 Octal D-type Transparent Latch; 3-state
Home Questions Tags Users Unanswered. Nik Middleton 6 5.
Get on to your supplier and ask them to justify their thoughts. As is stated in the below table the output max 74hct573h is 35mA for each output, being the nominal current 20mA, enough to control a LED in every output. And that supply current is also the main part 47hct573n the current that feeds outputs. This website has a built-in schematic editor. You can edit your question and 74hcy573n click on the icon that looks like a schematic symbol, and it will load the schematic editor.
Maybe you will be OK afterall, or maybe a simple part change can fix everything up. Hi, basic schematic added. Q are 8 outputs and attach to equipment that requires 20 ma. It’s not always LED’s but they are non inductive. I have no control over end devices.
My belief is that turning on all 8 outputs at 20 ma exceeds the IC max current.
My solution is to use P channel mosfets to switch the power. I’m loosing some voltage 4. You are not wrong. The IC has a global limit of 70 mA. Glad to know i’m not going nuts.
I should have added that there are 2 LEDS being driven from each output. It would have dataseet so simple to use a current drain driver but sadly it’s not an option.
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74HCTN – Nexperia – PCB Footprint & Symbol Download