Question of NVT4857UK

[wujie08]

#Question of NVT4857UK# TomasVaverka

I plan to use NVT4857UK chip in my project to convert voltage SD card IO signal provided by FPGA from 1.8v to 3.3v. I have few questions from the spec of NVT4857UK:

1. For the pin VCCB, is it an output signal of this chip? or an input signal need from host?  and does VCCB equal to VLDO? 

2. For the resistor R1,R2 on the pic of page 4, do these resistor have already been integrated in this chip or need to be added on PCB?

3. For the resistors R3, R4, R5 need to be added on PCB, am I right?

thanks a lot.

[TomasVaverka]

Hi Wu,

1. VCCB is VLDO output pin and requires an external capacitor between this pin and ground for proper operation of the LDO. Its typical value is 2.2 uF.

2&3. All resistors shown in the functional diagram are internal.

Best regards,

Tomas 

[wujie08]

thanks a lot, Tomas