Otp

[shahidali55]

Is there a 100% pin and software compatible one time programmable pic to the 16F84A ???

[mister_e]

i'm sure something exist but... Why?

[shahidali55]

I dont want to spend too much cash on erasable PICs cause once i give away the projects the IC will never be erased again...

[keithdoxey]

I dont want to spend too much cash on erasable PICs cause once i give away the projects the IC will never be erased again...
Flash chips arent expensive compared to the UV erasable ones and the modern flash chips have so many features.

If you use an OTP chip then if you have a bug in your code that surfaces later then you have to buy a new chip which will cost more than using a flash device in the first place.

[Acetronics2]

Is there a 100% pin and software compatible one time programmable pic to the 16F84A ???

We could just talk about the 16CR84 ... but programming must be done ... at factory ( ROM memory ), and min. quantities compulsory.


Now, I do not see your reason, but using the "code protect" option can avoid some ... forbidden use ( reading ) of the chip.

the re-use of the chip finally leads to program a brand new chip ...

Speaking costs OTP products are as expensive as Flash ones ... the cost difference is for Windowed devices ( UV Erasable )

Alain

PS: Even OTP device programs can be modified ( "1"s can be overwritten by "0"s ) ... do not repeat it !!!

[shahidali55]

I think the best solution is to shift to the 16F84A.

[Acetronics2]

Hi,Shahid

The 16F84 is quite an obsolete chip nowadays ... some pin and functions-compatible devices are MUCH costless ...

see µChip Direct for 16F628A i.e.

Another trick would be to buy stocks of "Leaded" devices ... but for the market ??? what really ???

Alain