IL2533 Datasheet | IK Semiconductor

Description IL2533N, IL2533D is CMOS IC, supporting all functions, necessary for design of electronic telephone with high characteristics. Standard application circuit is shown at figure 2. Device includes LD/MF constant automatic dialer, melodies generation, ring frequency identification and high quality circuit for line/speech. RAM at chip, intended for redialing of 31-digit number and memory elements, containing upto 21 symbols/data. Floating marker method enables to use LNR function under control of different РАВХ systems. Device contains volume control of hearing aid. Volume is controlled by VOL button (5.4d B) or "- /+" button (plus 8.1/minus 5.4d B in 5 levels). Main features ─ Line/speech circuit. LD/MF constant automatic dialer and tone ring at one 28-pin CMOS chip. ─ Operational range 13 to 100 mА (decreasing upto 5 mА causes productivity deterioration). ─ Soft limitation for elimination of drastic distortion. ─ Controlling of received signal volume. ─ Automatic line loss pensation. ─ Low noise level (max - 72 d Bmp). ─ Actual or plex impedance. ─ Switching LD/MF dialing. ─ Tone damper during programming. ─ Redial of the last 31 digit number. ─ Reference storage. ─ Redial of busy line or previous connection. ─ Pause button for applying to pause or waiting function. ─ 3 pulse flashes: buttons, “R1”- 100 ms, “R2” - 280 ms and “R3” - 375/600 ms. ─ Active RC-filter on chip. ─ Circuit of ring frequency determination. ─ Three-tone melody generator L S MFL RO VDD AGND 01 02 03 04 05 06 07 08 09 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 RI L I VSS CS M2 M1 L ED FCI R1 R2 R3 R4 C1 C2 .. ST B CI L O LCC HS/DP OS C MODE C4 C3 package pin out PACKAGE IL2533D assembly to 28-pin SO-package MS-013AE. MS-011AB. 1 ww.. IL2533N assembly to 28-pin DIP-package Versatility of the circuit provides possibility of variants selecting on circuit`s pin and several outer ponents. It allows adapting easily to the requirements of different standard (post,...