I am using this Schmidt trigger IC SN74HCS125 which has 4 channels I would like to save some board space by hopefully using only one resistor to pull down the enable pins of each channel. I do not plan to connect those enable pins to anything else as I want them to be always enabled. simulate this circuit – Schematic created using CircuitLab I have not done this before since what I have been doing since now was individually giving them their own resistor. Just intuitively speaking it should work, but there might be caveats that I am not aware of. Is doing this perfectly fine?

Can I share a single pull resistor on multiple enable pins to save space?

Electrical Engineering Asked on January 6, 2022

I am using this Schmidt trigger IC SN74HCS125 which has 4 channels

I would like to save some board space by hopefully using only one resistor to pull down the enable pins of each channel. I do not plan to connect those enable pins to anything else as I want them to be always enabled.

schematic

^{simulate this circuit – Schematic created using CircuitLab}

I have not done this before since what I have been doing since now was individually giving them their own resistor. Just intuitively speaking it should work, but there might be caveats that I am not aware of. Is doing this perfectly fine?

pulldown pullup resistors

One Answer

The unused inputs can be directly connected to ground (or supply voltage). It even reads in the datasheet.

Answered by Justme on January 6, 2022

Can I share a single pull resistor on multiple enable pins to save space?

One Answer

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