UM9151

The UM9151 is designed as one kind of pulse dialer and monolithic CMOS integrated circuit which converts pushbutton inputs to a series of pulses suitable for telephone dialing.It is intended to replace mechanical telephone dialers and can operate directly from the telephone lines.The pulse dialer function is implemented using two outputs;one pulses the line,the other mutes the receiver.The CMOS technology used to produce this device results in very low power consumption and enables easy interfacing with a variety of telephones with high noise immunity and few external components.

Features of the UM9151 are:(1)direct telephone line operation;(2)4X3 matrix single contact keyboard;(3)supply voltage range 2.5V to 5V;(4)inexpensive RC oscillator;(5)low power standby mode for redial;(6)22 digit capacity for redial;(7)18 lead dual-in-line package;(8)redial with either or # key;(9)dialer reset for line power break>200 msec;(10)pin selectable inter-digital pause;(11)high speed test capability.

The absolute maximum ratings of the UM9151 can be summarized as:(1)DC supply voltage:-0.3 to 6V;(2)operating temperature:-20 to 60;(3)storage temperature:-55 to 125.If you want to know more information such as the electrical characteristics about this part,please download the datasheet in www.seekic.com and www.chinaicmart.com .