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UM9559 series datasheets. Manufacturer: United Microelectronics Corp..

UM9559EDC supply voltage: +10.5V; 1000mW; tone dialer. For telephone dialing systems in 16-pin DIP package. Operational temperature range from -25°C to 70°C.Datasheet*)
UM9559FDC supply voltage: +10.5V; 1000mW; tone dialer. For telephone dialing systems in 16-pin DIP package. Operational temperature range from -25°C to 70°C.Datasheet*)
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