what does the /01 or /08 designate in device P80C552EFA/08,512 or P87C557E8EFB/01,55? I understand the 512 indicates a packaging convention.

[jridings1]

what does the /01 or /08 designate in device P80C552EFA/08,512 or P87C557E8EFB/01,55? I understand the 512 indicates a packaging convention. 

[jridings1]

by the way, nice to see Jive is still in use!

[bernhardfink]

The /01 and /08 should specify the ROM code number of the device.

The number behind the comma is a packaging option for the delivery (reel, tray, etc)

Regards,

Bernhard.

[jridings1]

Thanks Bernhard. What about this list of devices? This appears to be counter to this explanation. Here, we see ROMless P80 devices with the /08 for a ROM code.

P80C552EFA/08,512

P80C552EFA/08,518

P80C552IFA/08,512

P80C552EBA/08,512

P80C552EBA/08,518

P80C552IBA/08,512

P80C552IBA/08,518

P80C552EFB/08,557

P80C552EBB/08,557

[bernhardfink]

I will do a further check, but where is the list above coming from?

From an ordering system / a data book etc ?

Regards,

Bernhard.

[bernhardfink]

I checked through some historical documents and found a few indications that this numbering has nothing to do with the ROM code number specified in the data sheet ordering information tables.

Over time we updated the devices in several categories (silicon update, package material, 12-cycle to 6-cycle 80C51, manufacturing location etc) which lead to different device revisions.

Whenever possible we discontinued the old part, but sometimes the new part(s) and old part(s) were produced in parallel.

So when you have a /01 and a /08 device, then the /08 device is the new one.

Since this is not reflected in the latest data sheets of the devices, I can only assume that the new devices provide the same functional behavior as the older devices.

But I wasn't able to find any more details what has changed.

Best regards,

Bernhard.