Might a power audio amplifier work for you? I don't have any part=20 numbers to suggest right now but I do know that there are power amp=20 chips available with enable inputs. You will typically get 2=20 channels per package. 2 pins required for each channel: one pin sets HI or LO, the other=20 pin controls enable. Just a thought . . . dwayne At 12:34 PM 12/17/2014, Phil Keller wrote: >I have a need for a design I am working on for a high current, high >voltage selectable OPEN-DRAIN or OPEN-SOURCE buffer/driver. >To be more specific I need: >* Operate over a Vcc of 5v (or less) to 18v (or more) >* 5v on the input control, up to 16v on the outputs. >* Max toggle rate of < 5KHz. >* Capable of sourcing OR sinking > 100mA continuously >* Operate as either an OPEN_DRAIN or as an OPEN_SOURCE >* Not overly cost sensitive. >* I need a total of 40 per board so up to 8 drivers per package would be O= K. > >My first thought was to use a Tri-State buffer. The data input would >define which direction would be the driven direction and the enable >cause the device to go from Hi-Z to active. Thus for an OPEN_DRAIN I >would have the input LOW (assuming a non-inverting buffer) and connect >the ENABLE signal to the controlling source. Enable active >> Output >driven LOW. Enable inactive >> Output OFF. > >I have been unable to find a device that meets these requirements. I >looked at the TI UCC27524 device which has an ENABLE pin. The problem is >that the ENABLE is actually AND'd with the input pin, it is NOT >Tri-State device. --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .