UM91260

The UM91260 has the following features including 32-digit redial memory;10 number by 16-digit repertory memory;Tone/pulse  switchable  via  slide  switch  and inserts; a pause (4.08 sec.) automatically;Low operating voltage: 1.8V to 5.0V;Uses 480 KHz ceramic resonator;Dialing rate pin selectable 10 pps/20 pps (UM91261 only);Two keys single tone operation;Redial memory cascadable with normal dialing;Fully debounced 4 x 4 keyboard.

The  UM91260 series  is a  10-number by 16-digit tone/pulse switchable  repertory dialer with  a 32-digit redial memory.Through  pin selection, switching from pulse to tone mode  can be done by using slide switch.  The dialing rate&storage mode of the UM91260 is selectable by version.  The UM91261 is a 22-pin version with keytone output&dialing rate, with a storage mode that can be selected by pin selection.Stresses above those  listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

Connecting a row and a column together will activate a key operation.   When the ON HOOK STORE pin is inhibited, both the row and column are at high impedance in ON HOOK state.  When the ON HOOK STORE pin is available, the column input is pulled low and the row input is pulled high.  Scanning signals are presented on both the row and column pins under a valid key-in condition.  The key-in debounce time is typically 20 mS.The  UM91260  series  contains  an  oscillator  circuit  to generate the system  time-base,   One 480 KHz ceramic resonator, two 100pF serial loading capacitors and a 470 Kohm  feedback  resistor  form  a  complete  oscillator circuit.  The oscillator circuit is activated when the HOOK pin is low.There are either the dialing signal keys for both the PULSE mode and TONE mode operation or the memory location which is to be RECALLED or STORED, according to-the operation sequence.