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Original question:

TL3016: Vdd=+6V/-5V operation

TL3016: Full output range

Tom Harbison
Prodigy 10 points
Part Number: TL3016
Other Parts Discussed in Thread: TLV1871, LM311

Tool/software:

I apologize for the simple question but I can't tell from the spec and the device can run single ended so I'm not sure.  Can anyone tell me if the output will in fact swing from +5V to -5V with +/- supplies or just +5V to 0V?  I have a standard TTL signal and I need to convert it to a 0 to -5V signal with as sharp of edges and as little propagation delay as possible.  That's basically what I'm trying to accomplish.  Thanks for any help.

  • 0
    TI__Guru 60406 points

    Hello Tom,

    The TL3016 output will swing between VCC+ and GND pin.

    So if you power it with VCC+ = +5V, and VCC- = -5V, and GND at system ground, the output will swing 0 to 5V.

    IF you ground VCC- and GND, and VCC+ is +5V, then you are in single supply mode and the output will swing 0 to 5V.

    HOWEVER, if you tie GND to VCC- in a ±5V split supply, the output will still try to swing to VCC+, so the output theoretically should be +5 to -5. 

    So you cannot make the output swing 0 to -5 without making the inputs also negative (hang below GND).

    How much propagation delay is tolerable? We do have some devices that could operate off a split supply and swing 0 to -5.

    See the TLV1871 that is push-pull with separate output supplies - but is a little slower at 60ns. For this device, you could set VCCI to +5V, VCCO to GND, and VEEI = VEEO = -5V. Then the output would swing -5 to 0V.

    There is also the LM311 with the "floating" transistor output that cold be pulled-down to -5V (Emitter to -5V, and Collector to pull-up to GND - see fig 25). Note that you will have to reverse the input logic due to the inversion.

    I think the TLV1871 is the easiest solution..