BUY UM91611 https://www.utsource.net/itm/p/1397500.html
8-STAGE STATIC SHIFT REGISTERS
Description: The UM91611 is a CMOS integrated circuit designed for use in telephone applications. Features: Low power consumption Low noise High input impedance Low distortion High speed Low cost Applications: Telephone systems Voice recognition systems Speech recognition systems Audio signal processing systems Automotive audio systems (For reference only)