91214B

TECHNICAL DATA www.DataSheet4U.com Tone/Pulse Dialer with Handsfree Control and Flash Function IL91214A and IL91214B are tone/pulse dialers designed for providing standard DTMF or pulse signals. The ICs enable to: - generate standard DTMF or pulse signals of dialing as well as “flash” pulses; - store and redial last number; - generate pause in the transmitted package of dial signals; ICs are designed to be used in telephone sets. PIN DESCRIPTION HK MODE IN OSCI 01 02 16 15 R4 R3 R2 R1 C3 C2 C1 DP Pin # A B Designation HK MODE IN Description Hook switch input MODE IN = VDD: pulse mode, 10 Hz, М/В = 1/2, MODE IN = VSS: tone mode, MODE IN = floating mode, 20 Hz, М/В = 1/2 Oscillator input Oscillator output Ground Supply output Tone dialing output Dialing transmission mute output Mode output pin Key-in tone output Dialing pulse output Keyboard column input Keyboard column input Keyboard column input Keyboard row input Keyboard row input Keyboard row input Keyboard row input 03 14 OSCO 04 Vss 05 Vdd TONE 1 2 1 2 IL91214A 13 12 11 10 09 06 07 08 XMIT MUTE HK MODE IN 01 02 18 17 16 R4 R3 R2 R1 C3 C2 C1 DP 3 4 5 6 7 8 9 10 11 12 13 14 15 16 OSCI 03 OSCO 04 15 14 13 12 Vss 05 Vdd 06 TONE 07 XMIT MUTE 08 11 10 MODE OUT 09 KT 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 OSCI OSCO VSS VDD TONE XMIT MUTE MODE OUT KT DP C1 C2 C3 R1 R2 R3 R4 Fig. 1. Pin configuration in package IL91214B 1 IL91214 A, IL91214B www.DataSheet4U.com R1 KEYBOARD LOGIC R4 C1 C3 R...