Friday 29 November 2019

darlington - Any IC similar to ULN2003A with latch or enable/disable?


I'm working on a project that uses a ULN2003A (darlington transistor array) and I need to enable/disable it. The point is that ULN2003A does not have enable/disable pin.



I think that a IC with latch would do also the job. I've found TLC59213, that could do the job but si a quite rare IC.


Does anyone knows a darlington transistor array IC with enable/disable pin or a latch more common than TLC59213?


Thanks



Answer



The ULN2003A does have an interesting function at pin 9 (com). If pin 9 is held low, then all outputs will be held low. Depending upon your logic useage, this could be used as a disable. If your logic permits that "disable" means that all outputs shall be held low. I have used the ULN2003A in projects where I used the pin 9 as a lamp test, and also as a disable for preventing any outputs to be high.


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