IC for two bit address match

[Back2Volts]

To detect match on a two bit address, other that using a 4x XOR gates chip, are there other simple options out there ?

[Benta]

Search for "magnitude comparator". I know it's available in 4000 series CMOS, not sure about LS or HC/AC.

[edavid]

Fixed address, jumper selectable, software selectable?

Depending on the answer, you might use 74xx85, 74xx138/74xx139, 74xx151, 74xx266...

[Back2Volts]

Fixed address, jumper selectable, software selectable?

Depending on the answer, you might use 74xx85, 74xx138/74xx139, 74xx151, 74xx266...

Boring stuff.  Think of four identical modules plugged into a back plane bus.   Two connector pins hardwired in the back plane to set the slot address.   Two bus lines to address any one of the modules.   The modules have to react to match on the two pairs as being selected.

From the suggestions it seems the best is still the 4x XNOR gates (or XOR for active LOW).   

Thanks

[Benta]

If it's just static decoding, I'd use 1/2 of a 74HC139. If you like, you can place four jumpers on the outputs, so each module can be configured to be address 0...3. Might be useful for swapping later on.

[Back2Volts]

After thinking about it for a while, I am going to move the selection to a 74HC139 on the backplane and with select pins in the slot connectors.   It removes one chip from the slot boards.   

I will still have a two pin hardwired slot address to build addresses of some I2C chips in the modules.    The modules will be identical, with no need for dip switches or jumpers.

Thank you all.