Low voltage "LF" chips can be used as normal "F" designated chips ??

Started by AMIT KAPOOR July 25, 2009
Dear All,

Need Help!

Iwant to know whether the chips designated "LF" (low voltages devices, Example :PIC18LF2580 ) can be used as normal "F" designated chips( Example: PIC18F2580). I know the vice-versa is not true.Whether all the ports,I2C,SPI,SERIAL n so onetc of "LF" chips function as standard "F" chip at +5V. I mean are there any restrictions or limitations. Can i replace PIC18F2580 from the circuit and use PIC18LF2580 at + 5V. I searched the datasheet but didn't find anything important regarding this.....


Thanks
Amit

I believe an LF chip is the same as an F chip but has passed tests for
operation at low voltage. Other than allowing operation at low voltage, I
see no difference in the datasheet between an LF and an F part. I've gone
ahead and standardized on the LF part when the same chip (other than the
L) is used in different products that operate at 5V and 3.3V.

Harold

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> I believe an LF chip is the same as an F chip but has passed tests for
> operation at low voltage. Other than allowing operation at low voltage, I
> see no difference in the datasheet between an LF and an F part. I've gone
> ahead and standardized on the LF part when the same chip (other than the
> L) is used in different products that operate at 5V and 3.3V.

If you read the data sheet carefully you could conclude that the LF
chips are more limited in some aspects. A Microchip person once told me
that this is true *only *within the power supply range that is not
supported by teh standard F chips*. Within the power supply range
supported by an F chip an LF chip will behave the same.

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Wouter van Ooijen

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