CMOS IC help!
This is a 4-bit Magnitude Comparator.
The 7485 (or 74LS85) is pin-for-pin compatible.
The only thing is the Vcc power supply will have to be limited to 5
Volts. If this chip is connected to external inputs, they will have to
be TTL compatible, also.
Digi-Key sells both parts 4063B & 75LS85 (but I didn't check their
stock-on-hand).
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