DTMF TRX/Pulse TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP
DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 20-Pin PDIP
DTMF TRX 3.58MHz CMOS 2.5V/3.3V/5V 22-Pin PDIP
