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SN74GTL2014: SN74GTL2014 application

Nanfang Liao
Intellectual 2085 points
Part Number: SN74GTL2014


Hello Team,

Can you help to check if our SN74GTL2014 can support 1.05V CMOS to 3.3V CMOS, or 1.05V CMOS to 5.5V CMOS? thanks

if it is impossible to adjust the Vref to support the requirment below?

1.05V CMOS input/output spec is as below:

Regards,

Nanfang

  • 0
    TI__Guru* 97066 points

    Hi Nanfang,

    The SN74GTL2014 can operate from 3.3V to 1.05V.

    The 'B' side of this device has open-drain outputs, which are to be pulled up to your operating voltage (1.05V in this case). The spec lists a VOH requirement of 0.75V and an Iout requirement of -0.5mA. Since this device is open-drain, it cannot source current on its own -- both the VOH and the  Iout will be coming from the selected pull-up resistor. I don't think this will be a problem for you, but you should be aware of it.

    The VREF pin is typically set through a voltage divider from the 'B' side supply voltage (1.05V in this case).  You can set the threshold anywhere from 0.5V to 1.1V without any problems.  I would recommend resistors of value 100kohm and a {0.1uF to 10uF} capacitor to sink any supply noise (placed from VREF to GND).  This will produce a stable threshold voltage of 0.525V.

    One other important note - the SN74GTL2014 does not have Schmitt-trigger inputs, although your spec lists a requirement for them.  I'm afraid I don't know of any translator that will meet that requirement.

    All other specs for the SN74GTL2014 fall well within your listed tolerances.