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Hi team,
Need to drive a low frequency control signal (is a LED control signal), control LED light on / off. The whole line is about 50cm, which is divided into two parts. One part is the internal wiring of PCB, about 20cm, to the board edge connector; the other part is the external wire wiring, about 30cm, connected to an LED. Is it possible to use a SN74LVC1G17 ? If so, it is recommended to add it to the source or terminal. If not, could you give me any suggestions,thank you in advance.
Best Regards,
Amy Luo
Hi Amy,
The SN74LVC1G17 Schmitt-trigger buffer can be used to drive indicator LEDs that require 50mA or less of current. I would recommend operating the device with a 5V supply and a current-limiting resistor in series with the diode to prevent excessive current draw & damage to both the diode and the buffer.
For a very slow signal, which is typically true for just turning on or off an LED, the length of the wires won't have much impact on the operation of the device.
I don't know what you mean by 'source or terminal.' Here's a typical circuit diagram for driving an LED with a Schmitt-trigger buffer:
