74S189 DATASHEET PDF

Najin The resistors that are in the input of the 74H04 will not play any part in limiting the LED current. Did you write to the data register? Sign up using Email and Password. So, using this setup if I would like to drive another IC how would I connect it, I really have a hard time undertanding this What the open collector can do when used that way is to either sink current provide ground to the load when ON or leave the output floating high resistance across the transistor when off, the pullup resistor can force a HIGH state while in that high resistance mode.

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Samuzshura Did you write to the data register? If you measure the output pin voltage compared to ground, when the output pin should be Low open-collector activewhat do you get?

Thanks for the comment anyways. What would be the correct way to set it up? Another consideration is the max current of the 74HC04 chip which is 50mA total and with the LED resistors missing this can be a big problem. U2-U5, are they buffers? Post a schematic of what you currently have. What the open collector can do when used that way is to either ratasheet current provide ground to the load when ON or leave the output floating high resistance darasheet the transistor when off, the pullup resistor can force a HIGH state while in that high resistance mode.

What voltage level activates the buffers? You are essentially creating two paths two ground, which are both variable and not perfect. The datasheets list that max would be 0. The resistors that are in the input of the 74H04 will not play any part in limiting the LED current. Sign up using Facebook. Sign up or log in Sign up using Google. Open collectors outputs are usually used as low side switches by connecting the emitter to the dataaheet and then feed the ground side of load from the collector.

Tristian 1 9. That means the output IS pulling the line low at 15mA through the resistor to boot. Post as a guest Name. And what part number? Sign up using Email and Password. Typical open collector led setup would be: Email Required, but never shown.

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74S189 DATASHEET PDF

Samuzshura Did you write to the data register? If you measure the output pin voltage compared to ground, when the output pin should be Low open-collector activewhat do you get? Thanks for the comment anyways. What would be the correct way to set it up? Another consideration is the max current of the 74HC04 chip which is 50mA total and with the LED resistors missing this can be a big problem. U2-U5, are they buffers?

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