Minimum input voltage for SMA TTL

dev_q

Hi there,

Was trying to look up the minimum voltage that the SMA TTL would accept, but the spec sheet listed here: https://m-labs.hk/docs/sinara-datasheets/2118-2128.pdf, does not mention a minimum input voltage. What is the minimum that the TTL can detect? We are dealing with some non-standard TTL hardware and trying to figure out what is the lowest threshold that will allow detection of the signal.

Thank you.

fsagbuya

dev_q Hi, from what I understand in the datasheet, the parameter that you might be looking for is VIL max (i.e. 0.8 volts). This means they'll interpret any voltage at or below 0.8V as a logical low, including extremely low voltages. There's also a footnote in the datasheet that points to the chip used for SMA-TTL (See: https://www.ti.com/lit/ds/symlink/sn74bct25245.pdf). Additionally all schematics can be found in https://github.com/sinara-hw, for additional reference.