Shift register for driving 20 x reed relays (SIP-1A05)?

[onesixright]

Hiya All,

Lets start with best wishes, that all may happen what you wish for and that in good health! 

Quick question. I need to drive 20 reed relays (SIP-1A05). I was thinking of using 3 x 74HC595, but that leaves me with a few pins not used. Not a big issue, but I rather have 1 component that has 20 (or 2x 10), and on top i prefer to drive it via I2C. 

Any thoughts?

Much obliged!

[rstofer]

Sure!  A couple of MCP23017 I/O Expanders ought to do it
http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf