RTS902

RTS902 is a CMOS LSI designed for toys, doorbells and music boxes. It plays prprogrammed melody and is capable of generating songs in piano effect by using the built-in digital envelope circuit.

There are some features of RTS902 as follows. First is operating voltage range which is from 2.4V to 5.0V. The second is low power consumption. Then is 256-note ROM memory. Next is RC oscillator with an external resistor. Besides,1 sequence trigger key and 3 direct access keys are provided to select which song is to be played. The sixth is built-in on-the-chip envelope modulator. The seventh is direct-drive speaker and programmable LED flash. The eighth is provided PEN pin for drive motor. The ninth is typical oscillator frequency which is 128 KHz. The last one is power-ON reset: melody begins from the first note.

What comes next is about the absolute maximum ratings of RTS902. The DC supply voltage is from 0.3V to 6.0V. The input/output voltage is from GND -0.2V to VDD + 0.2V. The operating temperature is from -10 to 60. The storage temperature is from -25 to 125. Then is about the electrical characteristics (VDD=3.0V, GND=0V, TA=25, unless otherwise specified). The minimum operating voltage (VDD) is 2.4V and the maximum is -5.0V. The maximum operating current (IDD) is 1mA when unload. The minimum LED sinking current (LED Sinking) is 10mA when Vol = 1.0V. The minimum PEN driving current (LED Driving) is 1mA when Voh = 2.0V. The maximum out driving current (Out Driving) is 190mA when DAC full scale, Load = 8.