IL91210E Datasheet | IK Semiconductor

Description Pin No. 1 2 3 4 5 Designation R1 R2 R3 R4 HK Hook switch input. This inverter input pin detects the state of the hook switch contact. “Off Hook” is represented by a GND condition. “On Hook” is represented by a VCC condition. Make/Break Ratio Select Input. This input allows selection of the Make/Break ratio. M/B = VCC : 1/2 M/B = GND : 2/3 Mode select input. This input allows the selection of pulse mode or DTMF mode. MODE SELECT = VCC : Pulse mode operation MODE SELECT = GND : Tone mode operation Oscillator Input and Output pins. The time base for IL91210E is a crystal controlled on-chip oscillator, which is pleted by connecting a 3.58 MHz crystal or ceramic resonator between OSCI and OSC0 pins. Power supply pins. This device is designed to operate from 2.0 V to 5.5 V. Tone dialing output. When a valid keypress is detected in the DTMF mode, appropriate low group and high group frequencies are generated, which hybridize the dual tone output....