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Latch output and led and resistor?

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PCBwire

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Latch output and led

May i connect latch output directly to led and resistor.
Or NPN darlington array have to be used.
 

Re: Latch output and led

Every logic family is characterized by different output drive current ..
For example, 74ACT logic family can drive +/- 24mA of IOH and IOL ..
Any output current above ≈5mA can directly drive an LED (via a resistor) ..

You have to google for I[OH] of your latch ..

Rgds,
IanP
:D
 

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    PCBwire

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Re: Latch output and led

I oh, ol, is ± 50mA, so that should do it.
Vcc = 5V Voh = 5V and resistor 1kΩ.

Thank you for help. :)
 

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