Only interested in the binary logic part, not the motor side. The datasheet specifies a few absolute max ratings:
Table 4. Absolute maximum rating
IIN Input current (INA and INB pins) +/- 10 mA
IEN Enable input current (DIAGA/ENA and DIAGB/ENB pins) +/- 10 mA
Ipw PWM input current +/- 10 mA
ICP CP output current +/- 10 mA
ICS_DIS CS_DIS input current +/- 10 mA
and this ON-state supply current:
INA or INB = 5 V, PWM = 20 kHz 8 mA
According to this answer i need to worry about the sank / sourced currents as well as the quiescent current. If this is the case, then how would I identify those currents for my specific part ? Is there a generic rule for any IC ?
I was not clear on this one. What I am looking to do here is to sum up all the currents in my circuit so I can size a voltage regulator for it.
the specs were actually right there in another table, I was just searching for 'mA' instead of 'μA'. Seems these "CMOS compatible" IO pins are very amp-efficient:
IINL Low-level input current VIN = 0.9 V 1 μA
IINH High-level input current VIN = 2.1 V 10 μA