bigal_scorpio
Active Member
Hi to all,
I am making a circuit using a PIC to drive a ULN2803a octal darlington IC and after looking at the datasheet I am still left with a couple of little queries.
1. Should I tie any unused input pins to GND as is done with many ICs to stop floating and reduce power usage?
2. The sheet says that the inputs are buffered with 2.7k resistors internally for 5v TTL and CMOS inputs. Does this mean I can directly connect to the PIC and the Darlington pairs will be driven at saturation by the 5v present on the PICs pins?
I am puzzled as in the sheets Electrical Characteristics section it seems to show 3v as the absolute max input voltage! baffled.
Thanks for looking.......Al
I am making a circuit using a PIC to drive a ULN2803a octal darlington IC and after looking at the datasheet I am still left with a couple of little queries.
1. Should I tie any unused input pins to GND as is done with many ICs to stop floating and reduce power usage?
2. The sheet says that the inputs are buffered with 2.7k resistors internally for 5v TTL and CMOS inputs. Does this mean I can directly connect to the PIC and the Darlington pairs will be driven at saturation by the 5v present on the PICs pins?
I am puzzled as in the sheets Electrical Characteristics section it seems to show 3v as the absolute max input voltage! baffled.
Thanks for looking.......Al