smd regulator for running a single 328 ic?

jonisonvespa:
hi
ive got a requirement to add a clock to a 328, so i need a battery backup for it if the power goes out just wondering what is the most common surface mount 100ma regulator i could use / most popular one. or maby is there a more suitable one that i could use for such a small current?

i did measure a single 328 running think it was about 15ma if i remember

my first choice would be a 78L05L just wondering if this is a common regulator

thank you

What are your requirements for dropout voltage, etc.?