Archived 2026-09-26 from https://docs.buspirate.com/docs/hardware/bp5rev10/hardware/. Summary of
the relevant sections with the key sentences quoted, not a byte-perfect copy.
Cited from docs/stern-spike-trough-opto.md ("Bench tools") for why a Bus Pirate 5 can drive a
genuine 5V logic high on its I/O pins where a Bus Pirate v3.6 can't.
"IO pins are fitted with 74LVC1T45 bidirectional buffers." "Half of the buffer is powered at
3.3volts to interface the RP2040. The other half is powered from the VREF/VOUT pin at 1.2-5volts
to interface with the outside world."
The part is made by several manufacturers with different ranges (TI and Diodes Inc 1.65–5.5V;
Nexperia and WuXi I-Core 1.2–5.5V). REV10 uses the WuXi I-Core part (1.2–5.5V).
"1-5volts adjustable output, 300mA max", with "0-500mA current sense" and "0-500mA current limit
with digital fuse."
"we limit the maximum current draw with 330R series resistors on each 74LVC1T45 IO pin."