16F877A data sheet query

[sae140]

I understand that the 16F877A device has a 20Mhz spec, and that the 16LF877A has a 10Mhz spec.

However, on page 231 of the data sheet, example c) reads: PIC16F877A-I/P = Industrial temp., PDIP package
10 MHz, normal VDD limits.

Can anyone au fait with this device kindly explain where the 10 Mhz comes from in this example ? Ta.

 

[thecritic]

Rest assured 16f877A-i/p runs at 20Mhz. I have used it at that. Sorry if this wan't your worry.

 

[mvs sarma]

it is correct.
if you use FF877, it works only up to 4MHz with a supply between 2 to 3V.
from above 3V to 5V , it reaches 10MHz and that is the Maximum.
the F877A starts working at 4V onwards to 5V but can work at 20MHz

 

[sae140]

it is correct.
if you use FF877, it works only up to 4MHz with a supply between 2 to 3V.
from above 3V to 5V , it reaches 10MHz and that is the Maximum.
the F877A starts working at 4V onwards to 5V but can work at 20MHz

Mmmm. How is example c) correct then ? The example c) on page 231 refers to the 'F877A, not the LF version.
From the device marking PIC16F877A-I/P, they (Microchip) have somehow determined that this is a 10Mhz part.

The example given does not match device spec information elsewhere in the data sheet.

thecritic - Rest assured 16f877A-i/p runs at 20Mhz. I have used it at that. Sorry if this wan't your worry.

Appreciate your reply - not so much 'worry', but the device data sheet is now 7 years old, and you'd have thought that any typo's (assumption) would have been corrected by now ...

 

[mvs sarma]

i don't see page 321 on my datasheet i had

 

[sae140]

i don't see page 321 on my datasheet i had

Hello Sarma - it's page 231 - if you need it, the download link is: https://www.electro-tech-online.com/custompdfs/2011/02/39582b.pdf

There are also a couple of Errata sheets on Microchips's site - one of which (B7) I hadn't downloaded (whoops !): https://www.electro-tech-online.com/custompdfs/2011/02/80276A.pdf
which confirms that it's a typo ... should have read 20Mhz.

Can sleep easy now - thanks for all the input.

 

[mvs sarma]

of course i don't need