LMK00105: Questions about VDD pin

Jayden Qiu

Intellectual 1355 points

Part Number: LMK00105

Tool/software:

Hi Team，

This is FAE Jayden, My customer has some questions about the VDD pin (Pin 23 and Pin 8)：

Are these two pins (Pin23 & Pin8 ) are internally connected together?
As customer will use 4.75k pull-up resistor to connect pin23 to 3.3V，so there is a 0.15V voltage drop on Pin 23; And Pin 8 is connected to 3.3V directly; Is it okay for ZTE's design as there is voltage difference between these two pins?

Brs

Jayden

2 days ago

0 Michael Srinivasan 2 days ago

TI__Intellectual 2850 points

Hi Jayden,

Pin 8 supplies power to the core circuitry, while pin 23 supplies power to the input buffer. If the voltage drop on pin 23 is only 0.15V, then you have nothing to worry about - it falls well into the spec for VIH - which requires that the input be 1.6V or greater. The voltage difference is acceptable.

Thanks,

Michael

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LMK00105: Questions about VDD pin