Uc300eth-5lpt overheating precautions

[Doddy]

John, from last time I trawled the main board there are octal buffers driving each output to 5v logic levels. Each input is fed through a resistive voltage divided into the Microcontroller daughter card.

The 3v3 reg only powers the micro controller, with the buffer logic driven from the off board 5V supply

... though it’s been a while since I looked

[john swift]

Hi Doddy

not sure we are looking at the same board

the picture of the 5LPT-UC300 Motherboard

I am looking at has seven 14 pin IC's

possibly non inverting hex buffers ? (74HC365E ?)
[ with 6 inputs , 6 outputs & 2 supply pins ]

or 7414 inverting hex buffer found on some breakout boards

octal buffers like the 74245 have 20 pins -
8 inputs, 8 outputs, 2 supply (Vcc & Gnd) , 1 enable & 1 bi direction data control

John

PS

Just downloaded the UC300ETH manual (again) and see

2 ports have 12 outputs (like a PC printer port ) and the other
3 ports have only have 4 outputs

giving you a total of 36 digital outputs
so 7 hex buffers gives you 42 digital buffers to be used to buffer the micro controller