HM91710A

HM91710A/B HM91710A/B TONE/PULSE SWITCHABLE DIALER TONE/PULES SWITCHABLE DIALER GENERAL DESCRIPTION The HM91710A/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. 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 DIP16. PIN ASSIGNMENTS HM91710A HM91710B EM91710A C2 C3 C4 C1 OSCI OSCO XMUTE V SS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 R3 R2 R1 R4 TONE PO HKS V DD C2 C3 C4 C1 OSCI OSCO XMUTE VSS HFI EM91710B 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 HFO * This specification are subject to be changed without notice. 4.10.2002 1 HM 91710A/B HM91710A/B TONE/PULSE SWITCHABLE DIALER KEYBOARD ASSIGNMENT C1 1 4 7 * C2 2 5 8 0 C3 3 6 9 # C4 P→T F P RD 1). P→T 2). F 3). RD 4). P : In pulse mode, execute P→T function. : Flash...