UM93214A 1-memory Tone Pulse Dialer IC

The UM93214A 1-memory Tone Pulse Dialer IC is a large-scale integrated circuit that combines a pulse dialer and a tone dialer into a single chip. These items may dial in either a pulse or a tone mode. The chip has a pulse and tone dialer, allowing users to dial in either pulse or tone mode. Direct line current powering is possible because to the large operational voltage range. For both pulse and tone dialling, a voltage range of 2.5V to 5.5V is assured. Redialing of up to 32 digits is possible because to the built-in memory. Furthermore, the memory only requires one digit in tone mode. The DTMF output level has no effect on the VDD power supply voltage. For the DTMF, there is little variation in frequency dividing.

Pulse dialling was created to be a simple dialing mechanism that resembled a rotary dial telephone. This pulse dialling mechanism is technically defined by the phone’s rotary dial. The loop between the phone and the caller is broken when the caller picks up the receiver and operates the rotary dial. As a result, based on the number called, exchange at a certain frequency and at predetermined intervals. These disconnections are used by the analogue exchange switch to determine which phone number the subscriber phoned and are forwarded as current pulses to the so-called rotary switch. For appropriate signalling, a certain wait between the distinct numbers must be maintained.

The pulse approach is often supported by even analogue phones with push-buttons. Devices are frequently setup in a flexible manner for this approach and multi-frequency communication. Because the telephone number is broadcast over the speech channel and heard by the subscriber, this pulse dialling method is referred to as in-band signalling.

Applications

• Telephones and cordless telephones