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Original question:

SN74LVC1T45: Using I/O ports outside of absolute maximum voltage rating

SN74LVC1T45: My design requirements are VCCA and VCCB max upto 6V. So can I go for this IC?

gajendra kumar1
Prodigy 40 points
Part Number: SN74LVC1T45

Hi,

I have following doubt.

 1. In section "7.3 Recommended Operating Conditions"  VCCA and VCCB max voltage is 5.5V. But in section "7.1 Absolute Maximum Ratings"   VCCA and VCCB max voltage is 6.5V.  My design requirements are VCCA and VCCB max upto 6V. So can I go for this IC or can you please suggest other IC.

2. What if output pin is get shorted to Ground? Will it permanently damage the IC or it will recover when short removed from output pin of the IC.

Thanks and Regards

Gajendra

  • 0
    Guru 316690 points

    6 V does not exceed the absolute maximum ratings, so the device will not be damaged.
    6 V does exceed the recommended operating conditions, so there is not guarantee that the device will work.

    The only level shifters above 5 V can be found in the CD4000 family.

    If the output is shorted to ground while driving high, the current is likely to exceed the absolute maximum rating of 50 mA. This will damage the device, even when it happens for a short time. To protect against that, you would need a current-limiting series resistor or something like that.