where can i find datasheet about mm5402 & mm5456?

[majid]

where can i find datasheet about mm5402 & mm5456?

is any one know that whitch company make mm5402 & mm5456 ?

tnx

 

[unkarc]

Hi,

These two integrated circuits were made by National Semiconductor long time ago.

MM5402= 4-digit 12/24-Hours Alarm Clock, 60Hz
MM5456= Alarm Clock Radio

That is all data available from me from a Digital Data Digest 1990. It is sure these ICs have become obsolote.
I suggest you turning to customer support for the National Semiconductor's site at h**p://www.national.com where they may still have data sheets for these old ICs.

Regards, unkarc

 

[majid]

but the national have'nt it !!

it seems very old part!

tnx.