IL91210E - Tone/Pulse Dialer
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/Brea.
TECHNICAL DATA IL91210E Tone/Pulse Dialer High-Performance Silicon-Gate CMOS The IL91210E is a single-chip, silicon gate, CMOS integrated circuit with an on-chip oscillator for a 3.58 MHz crystal or ceramic resonator. It provides dialing pulse (DP) or dual tone multi-frequency (DTMF) dialing. A standard 4x4 matrix keyboard can be used to support either DP or DTMF modes. Up to 32 digits can be saved in the on-chip RAM for reading. In the DTMF mode, minimum tone duration and minimum intertone pa.
IL91210E Features
* wever, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this
