Other Parts Discussed in Thread: SN74LV8154
Hi,
I’m having a power consumption issue with a binary counter.
I’m using TI’s SN74LV8154 32 bit binary counter; you may find both the schematic and the actual board attached.
I’m supplying the counter with 2.08V, which should account for the current draw of a few µA (see page 5). Instead I’m drawing 2mA. The counter is fed with a 20MHz pulse; counter outputs nothing (GAL-GBU are pulled to 3.3V).
Where do 2mA come from? How do I drop it into the µA range? Many thanks in advance, I could really use some help here. I attached a pic of the setup too.
Here are some observations:
It looks like the current draw linearly depends on the input pulse; I don’t remember the exact readings, but I think I had ~0.2mA for 2MHz, ~0.45mA for 4MHz, ~0.6mA for 6MHz.
If I leave GAL-GBU disconnected, the current draw goes to 2.5mA. Same thing if I’m outputting any of the bytes. It’s not because I’m giving a 3.3V input into GAL-GBU, is it? (I don’t have direct access to the circuit right now to check if it is the problem)
