MK53761

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 ENTRIES POWERED FROM TELEPHONE LINE, LOW OPERATING VOLTAGE FOR LONG LOOP APPLICATIONS DIP18 SO20 ORDERING NUMBERS : MK53761N00 MK53761D Figure 1 : Pin Connections. V+ MODE C1 C2 C3 VOSC1 OSC2 1 2 3 4 5 6 7 8 9 D93TL017 18 17 16 15 14 13 12 11 10 PULSE OUTPUT HKS R1 R2 R3 R4 MUTE OUTPUT PACIFIER TONE/ CHIP DISABLE DTMF OUTPUT DESCRIPTION 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 keys and access several unique functions with single key entries. These functions include : Last Number Dialed (LND), Softswitch, and Flash. Figure 2 shows the keypad configuration. A LND key input automatically redials the last number dialed. The PROG key provides an easy way to program a number into any memory location (1-9) whether on-hook on off-hook. ...