Need some help in finding a suitable microcontroller

 Need some help in finding a suitable microcontroller

Hi everyone, i'm currently choosing a microcontroller with at least 1kbytes of on-chip sram/xram that can be used for xdata. However, i would want to avoid having a big microcontroller like DS89C450. SMD would work but i would want to it to have a socket. I have search the web for the microcontrollers with at least 1kbytes of sram/xram. The closest i can find that is DS89C450, the rest are SMD. Maybe, i'm not looking hard enough but does anyone have any recommendation?

 RE: Need some help in finding a suitable microcontroller

Why not go for a Cortex M0, then?

 RE: Need some help in finding a suitable microcontroller

Sorry, i forget to state that i will be using for Keil C51 Programming.

 RE: Need some help in finding a suitable microcontroller

What about the Atmel AT89C51RD2 or ED2? There is similar devices from nxp, too. They should be available in PLCC.

 RE: Need some help in finding a suitable microcontroller

Yeah, i have considered those but i need SMD microcontroller with socket.

 HUH

SMD microcontroller with socket
means
Surface Mount Device microcontroller with socket

 URGENT.....What is the best mcu

KR1816VE51

 RE: HUH

A surface-mounted PLCC socket would be close to what is wanted.

 RE: HUH

Are you looking for an SMD part or not? Yamaichi can provide sockets for almost everything in various solder terminal variants anyways... if cost is not an issue.

 RE: HUH

Ya, i am but with a socket since it's easier to put onto my PCB board. So i assume there isn't any other SMD that comes with sockets?

 less and less ...

less and less devices come in socketable packages.

you may as well get used to modern packages, otherwise the choices are very limited for modern devices.

SILabs has just about the perf3ct match for your requirements, but not in DIL/PLCC

Erik

 RE: less and less ...

Oh okay, thanks for your reply. I shall seek an another alternative then.

 RE: with a socket since it's easier to put onto my PCB board

Sorry - that doesn't make sense! Sockets are big and bulky and expensive!

Just putting an SMD straight onto the board is, surely, far easier - you don't even need holes in the board!!

If you want to adapt an SMD package to 0.1" pin spacing, there are adaptors available to do that.

Like this:
http://www.antronics.co.uk/images/smd_ad2.jpg
http://www.antronics.co.uk/images/smd_ad1.jpg

http://uk.rs-online.com/web/c/semiconductors/sockets-heatsinks/ic-sockets-package-adaptics-dil/

http://www.winslow.co.uk/adaptics

 RE: with a socket since it's easier to put onto my PCB board

Well, thanks for all the help but i just found out that even if i go for AT89C51RD2/ED2 i can't burn my program to it as it doesn't fit on the burner and my keil uvision 4 does not have it in the device list when i create the project. I will just stick to the big DS89C450.

 RE: with a socket since it's easier to put onto my PCB board

So you want a processor that can be specifically removed from the PCB, and put in a programmer?

Move into the current century - get a processor that you can reprogram while the processor is still soldered to the PCB. There are a number of processors that have a good interface for in-application and in-system programming. Some of them can be programmed with very, very cheap programming adapters. Some of them can use the same cheap adapter to debug the program.

 itty bitty processors

itty bitty processors with ISP are plenty from SILabs.
as I originally posted SILabs have plent devices that fit
choosing a microcontroller with at least 1kbytes of on-chip sram/xram that can be used for xdata. However, i would want to avoid having a big microcontroller

Erik