On 10/02/2014 16:38, Gareth Magennis wrote:
"N_Cook" wrote in message
...
before consigning to the mule park , investigated the JAPN IC a bit
5 pin,
p1&2 gnd, 3 N/C unless hidden in an interlayer,4 to large Boss R03015201
p21, p5 absent, p6 3.3V
Power-on reset IC?




That IC is S80130ANMC. Voltage supervisor with built in delay.



Gareth.



I've never seen such long timed power-up reset/delay IC before.
I suppose one dot is the index mark and the other dot Seiko logo.
Another SMD topcode out there now.