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What is the positive supply current for V+ = 3.3V?
Do you recommend placing a cap next to the Vcc pin? If so, what value?
Thanks,
Miles
Miles,
The TS3A27518E-Q1 datasheet characterizes the device at 3 different voltage supply levels 3.3 V, 2.5 V, and 1.8 V with +/- 10% tolerance because system power supplies are not perfect.
Supply current for a switch IC will vary passed on the voltage applied to the Vcc or V+ pin. The higher voltage placed on the Vcc or V+ will result in a high current consumption from the IC. Since most engineers are concerned with maximum power consumption of the IC the Icc or I+ spec in the datasheet is listed at the highest voltage tolerances 3.6 V, 2.7V, and 1.95 V.
The datasheet sates 40nA at 25 deg C as the typical power consumption for a 3.6 V supply. If a lower voltage is used less current will be consumed by the part.
What are you using this switch for that requires to know if <40nA will be an issue in your system?
It is common practice to place bypass capacitors on supply pins to filter out unwanted noise. This is more critical if you are passing analog signals through the switch that are sensitive to noise and less critical if you passing a digital signal through the switch. What type of signal are passing through the switch?
The value of the capacitors to pick are typically 1uF or 0.1uF and placed as close to the IC as possible but you must check what type of circuit is powering the IC to be certain of the size. For example the incorrect capacitance on an LDO can cause oscillations.
Thank you,
Adam
