EM91810B

EM91810A/B EM91810A/B TONE/PULSE TONE/PULES SWITCHABLE SWITCHABLE DIALER DIALER WITH WITH LCD LCD INTERFACE INTERFACE GENERAL DESCRIPTION The EM91810A/B are Tone/Pulse switchable dialer which are fabricated in CMOS technology with wide operating voltage for both tone and pulse mode, and consumes very low memory retention current in ON-HOOK state. EM91810A/B also provide SDO (serial data output) function to drive LCD driver (EM32100, EM32116, EM32117) and voice synthesizer. FEATURES Tone/pulse switchable dialer. One 32-digit last number redial memory. Pulse to tone (P→T) is provided for PBX operation. Flash key is available. Minimum tone duration is 98ms or 83ms. Minimum intertone pause is 98ms or 83ms. Uses 3.579545 MHz crystal or ceramic resonator. Many options can be selected. Mode (10 PPS ; 20 PPS ; Tone) M/B ratio (40 : 60 ; 33 : 66) Pause time (3.6s) Flash function (RESET) P→T pause time (3.6s) Flash time (600ms; 300ms; 100ms; or 80ms). Mixed dialing. Handfree function is provided for speaker phone application. Power on reset circuit is provided. Package in DIP18 or DIP20. SDO function that is supported to drive LCD driver (EM32100) and voice synthesizer to indicate dialing number. Key tone function is provided. PIN ASSIGNMENTS EM91810A C2 C3 C4 C1 OSCI OSCO XMUTE VSS SDO 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 R3 R2 R1 R4 TONE PO HKS VDD KT C2 C3 C4 C1 OSCI OSCO XMUTE V SS HFI SDO EM91810B 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 1...