S5T5855A

UNIVERSAL 15 MEMORY DIALER S5T5855A INTRODUCTION The S5T5855A is 15 memory Tone/pulse switchable dialer with 32 digit redial memory. 16 digit indirect 10 memory and 16 digit direct 4 memory are possible. The Flash time is selectable on the keypad Also, Hands-Free and Hold functions are controlled on the keypad. The S5T5855A can fulfill all the standards of each country. 22−DIP−400 FEATURES Flash Time selectable on the keyboard (100, 303, 604 mS) Hands-Free and Hold functions Tone/Pulse switchable 16 digit indirect (Two-touch) 10 memory (Pulse: 16 digit, Tone: 15 digit) 16 digit direct (One-touch) 4 memory (Pulse: 16 digit, Tone: 15 digit) Uses 3.579545MHz Color burst Crystal or ceramic resonator Pulse rate selectable. (10 pps, 20 pps) Make/Break ratio selectable (40: 60, 33 : 66) Single tone enable for test Tone (T/) key function (Pulse → Tone) Redial function (Pulse : 32 digit, Tone: 31 digit) Pin compatible with S5T5820C, S5T0080A, and S5T5850 ORDERING INFORMATION Device S5T5855A01-D0B0 Package HFD 22−DIP−400 O HOLD O EM O Function Flash Time Selectable M/B Ratio Selectable PPS Selectable *HFD : Hands Free Dialing Function *HOLD : Hold for Melody *EM : Emergency Memory 1 S5T5855A UNIVERSAL 15 MEMORY DIALER BLOCK DIAGRAM VDD OSCI OSCO M/B OSC DIVIDER M/B COUNTER PULSE COUNTER DP HS CONTROL CIRCUIT MDS/DRS SYSTEM CLOCK TIMING COUNTER DEBOUNCE CIRCUIT X’ MUTE WRITE/READ ADDRESS COUNTER 4 REDIAL RAM DATA LATCH C1 C2 C3 C4 C5 R1 R2 R...