Speech - Tone/pulse Dialer - Led Indicator

The device ST3917A consists of the speech and the dialer func- tions. It provides the DC line Interface circuit that termi- nates the telephone line, Analog Amplifier for speech transmission and necessary signals for either DTMF and pulse dialing. When mated with a Tone ringer, a complete telephonecan be producedwith just two ICs. TheDClineinterfacecircuitdevelopsitsownlinevoltage acrossthedeviceandit is adjustablebyexternal resistor to suit different countrys specification. A built-in LED driver CAN deliver excess line current to external LED indicator(s) during dialing and speech mode. The LED(s) CAN be used either for keyboard illumination purpose or for tonemode indication during softswitch and mixed mode dialing by connectingMU/MFI pin to VDDandGNDoranyrowrespectively.The LEDcurrent is limited to 17mA(typical). By STMicroelectronics
ST3917A 's PackagesST3917A 's pdf datasheet

ST3917A Pinout, Pinouts
ST3917A pinout,Pin out
This is one package pinout of ST3917A,If you need more pinouts please download ST3917A's pdf datasheet.

ST3917A Application circuits
ST3917A circuits
This is one application circuit of ST3917A,If you need more circuits,please download ST3917A's pdf datasheet.

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ST3917A Application Notes ST3917A RoHS ST3917A Circuits ST3917A footprint