BU8307CS Datasheet (Rohm) - Pulse / tone dialer

BU8307CS, Pulse / tone dialer

(1) ROW1 to ROW4 and COL1 to COL4 These are the keyboard input pins.

They can be connected to a 3 4 (2 of 7) standard keypad, or a 4 4 keypad.

Key input becomes valid by either shorting a single ROW input and a single COL input, or setting a single ROW and a COL input to LOW at the same time.

If tw

BU8307CS Features

* 1) The chip includes both a pulse and tone dialer, making it possible to dial in either pulse or tone mode. 2) A wide operating voltage range enables direct powering by line current. The voltage range guaranteed for both pulse and tone dialing is 2.5V to 5.5V. 3) A built-in memory enables redialing