Re: [Arm-netbook] help needed with a ttl logic circuit

On Sunday 23 August 2015 15:52:27 Luke Kenneth Casson Leighton wrote:

http://hands.com/~lkcl/ttl_logic_circuit2.png

still don't feel completely happy (esp. with the schottky diode), i feel another transistor might be needed especially because VREFTTL (for the EOMA68_BOOT0 TTL level) could be *lower* than 3.3v.

There's no resistor to limit the current when ext_boot0 is up (from ext_boot0 to gnd).

But the schottky diode will prevent any current to go there... I don't see how the first transistor can be switched on...