There are a lot of Maxim Integrated MAX9039BEBT+TCFF applications of comparators.
Process contollenr
Servo motor controls
Communications digltal frequency synthesizers: VHF, UHF, FM, AM, etc.
Companion Appliceation Nole, ICAN-6374, "Application of the CMOS CD4059A Programmable Divide-by-N Counter in FM and Ctizens Band Transceiver Digital Tuners"
Fixed or programmable irequency division
“Time out" timer for consume-appication industrial controls