MPC5746R pad types pad_isatww_st_hv vs. pad_pupd_hv

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MPC5746R pad types pad_isatww_st_hv vs. pad_pupd_hv

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jamesmurray
Contributor V

Is there any document that explains what these pad types mean?

I've searched the Reference Manual and the Datasheet and the I/O spreadsheet. They all mention them, but I am not seeing an explanation of what they really mean.

e.g. the RM says:

"NOTE: Supported input levels vary according to pad types. Pad type "pad_sr_hv" supports only the
CMOS input level, while pad type "pad_isatww_st_hv" supports TTL and CMOS levels. Refer to
the attached IO spreadsheet for the pad type of each pin."

A web search just led me to the 5746R docs I already have.

Any ideas?

James

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davidtosenovjan
NXP TechSupport
NXP TechSupport

Hi, for "pad_isatww_st_hv" pads you may choose whether they have TTL or CMOS characteristics as defined in the table below (datasheet screenshot). "pad_sr_hv" pads just have only CMOS characteristics. That's the difference and there is no document for public that would describe it in more details.

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jamesmurray
Contributor V

OK,

thanks for the reply, I'd gleaned as much already.

I was rather expecting that a public document might explain the rather cryptic pad names more explicitly !

James

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