SN74LVC16T245: Can we use SN74LVC16T245 for VCCA=VCCB & Need to Follow any Power Sequence?

Akshai Kumar

Part Number: SN74LVC16T245

Tool/software:

Hi,

Iam using (SN74LVC16T245) Part for Level Translation Application, In my case VCCB is Fixed & that IO Signals are 3.3V , VCCA Port Signals Can be 1.8V or 2.5V or 3.3V or 5V but Present it will be 3.3V IO Signals.

So in the above Mentioned Requirement it Clearly Says that at one situation it will be VCCA=VCCB, in datasheet it mentioned both VCCA and VCCB can be supplied at any voltage from 1.65 V to 5.5 V. Now as per datasheet information will it work at VCCA=VCCB? &

Need to Follow any Power Sequence for Port-A & Port-B with available Combinations?

Thanks & Regards,

Akshai.

over 1 year ago

0 Michael Ikwuyum over 1 year ago

TI__Guru 54446 points

Hi Akshai,

VCCA = VCCB works great. However, Vi should not be lower than VCCinput but can be higher than VCCinput.

I.e. Presuming VCCB is the output side as 3.3 V and B ports as 3.3 V with VCCA 3.3 V, works with A ports 3.3 V or 5 V but not A ports as 1.8 V or 2.5 V is not recommended.

You may also see [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)? and [FAQ] How does a slow or floating input affect a CMOS device?.

For the power sequence, yes, the sequence needs to be followed if the state of the output before VCC is fully ramped up is important. If not important, then not a device concern as device will not be damaged, thanks.

Best Regards,

Michael.

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SN74LVC16T245: Can we use SN74LVC16T245 for VCCA=VCCB & Need to Follow any Power Sequence?