This part is a kind of semiconductor called CS9370.

Function of this product has DTMF Receiver.

Manufacturers : Semico

Image and pinout :

Some of the text within the PDF file :

www.DataSheet.co.kr Semic● The Document is Applied to: CS9370DGP、CS9370DGO General Description CS9370 DTMF Receiver The CS9370 is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section uses switched capacitor techniques for high-and low-group filters and dial-tone rejection. Digital counting techniques are employed in the decoder to detect and decode all 16 DTMF tone-pairs into 4-bit code. External component count is minimized by on-chip provision of a differential input amplifier, clock-oscillator and latched 3-state bus interface. Features z z z z z z z VREF 4 INH 5 PWDN 6 OSC1 7 OSC2 8 VSS 9 CS9370 Min. 2.5 Typ. CMOS, 5/3 Volt operation. Excellent performance with minimum board quality. Central office quality. Low powe [ ... ]

CS9370 PDF Datasheet Download