Outline
This IC was developed for use in home-use telephone and small-scale telephone systems, and incorporates data transmission functions (AMI).

FEATUREs
1. Incorporates efficient switching regulator with broad input voltage range
    VOUT 5V±0.25 IL 250mA (13~45V)
    VIN 15~45V
2. Internal data transmission/reception circuits
    Data can be superposed on the power supply line for transmission.
    AMI format is used for transmission route coding.
3. Internal system reset circuit
    5V line abnormal voltage detection circuit
    Watchdog timer reset circuit
4. Internal speaker amp
    260 mW typ. at 8Ω load
    Mute pin
5. Internal beep sound generator circuit
    With pin to vary audio volume (also used to turn beep sound on and off)