SA589

sames FEATURES n n n n n SA589 LD/DTMF SWITCHABLE DIALLERS WITH DEDICATED KEYS FOR 20 MEMORIES Selectable Loop-Disconnect or DTMF Modes Keypad Switchable LD to DTMF 20 x 24-Digit Memories, (each with Dedicated Key) 24 Digit Last Number Redial Selectable Make/Break Ratios 2:1 and 3:2 n Uses Inexpensive 560kHz Ceramic Resonator n Batteryless operation - Low Power CMOS n Mask Programmable Options to suit application n Timed Break Recall (Flash) and Earth Recall DESCRIPTION The SA589 family are keypad switchable LD/ DTMF dialler devices with a last number redial facility and twenty 24-digit memories each with its own dedicated dialling key. Three operating modes are available: LD only mode, DTMF only mode and LD mode with the ability to switch temporarily to DTMF mode from the keypad during a call. This last mode enables subscribers to access such services as home banking. Mixed LD and DTMF numbers can also be stored in memory. The SA589 devices are pin compatible with the SAMES switchable dialler families SA541, SA545, SA585, SA587 and SA588 - providing a complete range of telephone features within a single PCB and circuit design. Metal mask and pin selectable options are available to service specific requirements of particular countries and customers. FIG. 1 PIN CONNECTIONS SA589 NC COL6 IMP SELECT MASK OSC OUT OSC IN FILT IN FILT OUT HSW V V 1 2 3 4 5 6 7 8 9 10 11 SS DD 12 13 14 17 16 15 MFOUT COL7 ROW6 28 27 26 25 24 23 22 21 20 19 18 ROW7 COL5 COL4 ROW4 ROW3 ROW2 ROW1...