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CD74HC4053: About VCC, VEE Supply current

Part Number: CD74HC4053

HI

1. What is the VCC, VEE supply current in the worst case?

The design conditions are as follows.

VCC: +5V

VEE: -5V

Frequency: 1Mbps

2. Is there any difference between single power supply mode (VCC:+5V, VEE:GND) and double power supply mode (VCC:+5V, VEE:-5V) other than the following two?

- Ron

- leakage current

Thank you

  • Hi,

    1. The worst spec supply current is given for positive and negative supplies:

    The logic pins should be ran at VCC or GND wherever possible as that is where the spec is defined. If the control voltage is in-between VIL(max) and VIH(min) you can essentially short VCC to GND and the current will be very high - but it doesn't tell you much. If you use this device where ~VCC is the logic 1 and ~GND is logic 0 then the max supply currents are highlighted about 

    2. None of these specs are changing because there is a dual or single supply (except supply current as you adding another supply essentially) - they change because of the magnitude of VCC - VEE is changing.

    Ron - will decrease with an increase in VCC - VEE

    Leakage Current - Will increase with an increase in VCC - VEE; however temperature typically has way more of an effecct

    Supply Current - There is a second supply with dual supply so there is an increase of total power that can increase.

    Realistically very few specs aren't going to change because of supply voltage changes - most of them will. This datasheet uses  a lot of "max only" specs which you may not see the change as much - but most of the typical specs are different from VCC = 5V VEE = 0V versions and the VCC = 5V and VEE = -5V versions.

    If you have any questions please let me know!

    Best,

    Parker Dodson 

  • Dear Parker Dodson

    I'm using 40 CD74HC4053 and designing "VCC = +5V, VEE = -5V".

    To design +5V, -5V supplies, I need to know the VCC and VEE maximum current consumption of the CD74HC4053.

    The information you provided is quiescent current. Can I design power supplies based on this information?

    Isn't it different from the operating maximum current consumption?

    Best Regards

    WSJ

  • Hi WSJ,

    For a multiplexer the quiescent current is basically the same thing as current consumption during operation. Its the same spec on newer devices but we changed the name to supply current. Essentially VDD / VEE are connected to logic gates as their high voltage and low voltage points. The only current the mux consumes is the current from VDD to VEE through the logic gate. When the input is GND or VDD the impedance between VDD and VEE will be high so current consumption is low (that is what is shown). As the control voltage starts going towards VIL(max) or VIH(min) the impedance will get lower and more current will be drawn. The Current through the multiplexer is determined by input signal and loading conditions - as the multiplexer is passive, and this won't increase current consumption of the part - it will increase power consumption as power in this switch = (VCC - VEE) * ICC + Isw1^2 * Ron1 + ... + Isw3^2 * Ron3. So ICC is the supply current/ current consumption of the device - but I understand how its written it can be a bit confusing.

    If  you have any other questions please let me know!

    Best,

    Parker Dodson