MK53761 Datasheet (ST Microelectronics)

MK53761, REPERTORY DIALER

The MK53761 is a Silicon Gate CMOS IC that provides necessary signals for either DTMF or loop disconnect (pulse) dialing.

The MK53761 buffers up to 18 digits into memory that can be later redialed with a single key input.

Up to nine repertory numbers may be stored.

Users can store all 12 signaling k

www.DataSheet4U.com MK53761 REPERTORY DIALER .

SINGLE CHIP DTMF AND PULSE DIALER SOFTSWITCH CHANGES SIGNALING MODE FROM PULSE TO TONE NINE NUMBER REPERTORY PLUS RECALL OF LAST NUMBER DIALED (18 digits each) FLASH KEY INPUT INITIATES TIMED HOOK FLASH 8 TONE PER SECOND DIALING IN TONE MODE AND 10 PPS IN PULSE MODE DTMF ACTIVE UNTIL KEY RELEASE MINIMUM DTMF DURATION/SEPARATION GUARANTEED (74/54 ms) PACIFIER TONE PROVIDES AUDIBLE INDICATION OF VALID KEY INPUT FOR NONDTMF KEY ENTRI

MK53761 Features

* provided by the PABX or a central office. July 1993 C4 DIP18 V+ MODE C1 C2 C3 VOSC1 OSC2 C4 N.C. 1 2 3 4 5 6 7 8 9 10 D93TL018 20 19 18 17 16 15 14 13 12 11 PULSE OUTPUT HKS R1 R2 R3 R4 MUTE OUTPUT PACIFIER TONE/ CHIP DISABLE DTMF OUTPUT N.C. SO20 1/11 MK53761 Figure 2 : Keypad Configuratio