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SN74HCS138: Using a MSP432 controller to give Vcc to the device

Astrome Tech
Intellectual 370 points
Part Number: SN74HCS138

I am planning to turn on SN74HCS138 using MSP432P4111 GPIO pin i.e. give 3.3V as Vcc to the demux from a GPIO pin of my controller. I will be using multiple demuxes in a way that I can turn on and off each device using the controller. The max Icc (supply current) as mentioned in demux datasheet at 6V is 2uA and this can be comfortably be provided by MSP432P4111.

1. Is there any pitfall to this approach ?

2. Any other consideration I need to keep in mind in this design?

  • 0
    TI__Mastermind 23373 points

    Hey Astrome,

    I wouldn't recommend this approach. The HCS device would draw static and transient current. From a source such as a MSP432 I wouldn't imagine it being stable and the VCC would shift which could effect performance. 
    Can you not use the same supply that the MSP432 is using? I would think that supply with a switch and using the MSP GPIO's would work for switching the device on/off.

    I'm not a specialist in MSP430's so i'm going to loop in the MSP team to give more insight on whether the MSP432 could handle this. 

    Thanks,
    Rami