MK53732B Datasheet - STMicroelectronics
MFG CO.

STMicroelectronics
DESCRIPTION
The device is a Silicon Gate CMOS IC that provides necessary signals for either DTMF or loop disconnect (pulse) dialling. The dialer buffets up to 28 digits into memory that can be later redialed with a single key input. Additionally another 28 digits memory is available for the save function.
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