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Power Logic Shift Register TPIC6C595

Peter Gerlesberger
Prodigy 55 points
Other Parts Discussed in Thread: TPIC6C595

Hello,

could somebody tell me, if the following statment of a ti application report slpa004a-1.pdf is valid for TPIC6C595 too?

"The logic used is specified within the data sheet to operate from 4.5 V to 5.5 V, but it is capable of operation
down to 3 V and up to an absolute maximum voltage of 7 V. The CMOS transistors used in the digital logic
have small feature sizes and short channel lengths as well as tightly controlled, low threshold voltages. Due
to these characteristics, the CMOS gains are high, and the parasitic capacitance is minimized. Because of
this, the logic is able to function at greater than 25-MHz operation over the full VCC range of 3 V to 7 V
and over the temperature range of –40°C to 125°C."

Best regards,

Peter

  • 0
    Guru 22270 points

    Hello Peter,

    Looking at the data sheet for the TPIC6C595, most of what I see in the statement is confirmed.  The absolute ratings match, the frequency matches in Figure 6 and the logic levels match from Figure 8.  Although the input says 0.85*VCC, I have never had an issue driving it with 3.3 volts.

    Just which parameter are you concerned with?

    Thanks,

  • 0 in reply to Greenja
    Prodigy 55 points

    Hello greenja,

    Thanks for your quick response!

    The important parameter for me is the power supply voltage of 3.3V with TPIC6C595.

    We have tried it with 3.3V and it works, but it is doubtful without feedback from TI E2E.

    Best  regards,

    Peter