Why does the stm32f103c8tx have completely different options for its PLL multipliers than stm32f105RB??

[Javier1]

currently using stm32f105 (HSI+PLL) ,and i am trying to clock faster than 36Mhz

They are from the same stm32 familly, why is the PLL of the stm32f105 limited 

I am using CubeMX 6.4.0

[Javier1]

Looking into stm32f1xx_hal_rcc_ex.h

 

[Javier1]

From the RM0008 reference manual (page 126) :

It looks like stm32105 is a "connectivity line device"

[Javier1 · Accepted solution]