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| Feature List | W528Bx | W528xxx | W523Axxx | W583xxx | W583Lxx | W588Sxxx | W588Axxx |
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| Voltage Range | 2.4V~5.5V | 2.4V~5.5V | 2.4V~5.5V | 2.4V~5.5V | 1.8~3.6V | 2.4~5.5V for 4MHz; 3.6~.5.5V for 8MHz | | System Frequency | 3MHz | 3MHz | 3MHz | 3MHz | 3MHz | 4~8MHz | 4~8MHz | | Synth. Method | ADPCM | ADPCM | MDPCM | MDPCM | MDPCM | MDPCM ADPCM | | I/O Pin | 1I/P, 1O/P | 3I/P, 3O/P, 1I/O | 4I/P, 5O/P | 8I/P, 8O/P | 8I/P, 8O/P | 16I/O | 4I/O, 4O/P~8I/O | | Oscillator | Ring | Ring | Ring | Ring / X'tal | Ring | Ring | | DATA RAM (Byte) | 1 | 1 | 4 | 8 | 8 | 128 | 96 | | Voice Channel (max) | 1 | 1 | 1 | 1 | 1 | 3 | 2 | | IR Carrier | | | | Y | Y | Y | Y | | 32KHz X'tal | | | | | | Y | | | SIM (1) | | | | | | Y | | | LVR (2) | | | | | | Y | Y | | PWM output | Y | | Y | Y | Y | Y | Y | | DAC output | | Y | Y | Y | Y | Y | Y | Note: 1. SIM means Serial Interface Management to extend external voice memory. 2. LVR means Low Voltage Reset..
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