MT9172ANR1 is a DNIC (Digital Network Interface Circuit) under Microchip (formerly Zarlink/Mitel) ISO²-CMOS ST-BUS communication family, supplied in 24-pin SSOP tape & reel package. Based on proprietary adaptive echo cancellation technology, it realizes full-duplex digital transmission up to 160 kbit/s over a single twisted pair, natively compliant with ISDN 2B+D basic rate frame format, integrating frame synchronization and clock extraction circuits. It adopts single 5V power supply with ultra-low power consumption, integrating line transceiver, echo cancellation and digital bus conversion in one chip. It can serve as core component for ISDN subscriber line interface, short-distance high-speed twisted-pair modem and digital PABX line card, widely deployed in wired voice communication and industrial twisted-pair high-speed data transmission.

1. Manufacturer: Microchip Technology (Former Zarlink Semiconductor) 2. Device Type: DNIC Digital Network Interface Communication IC 3. Package: 24-SSOP SMD, 1.5mm lead pitch 4. Shipping Form: 7-inch lead-free matte tin tape & reel (marked R1) 5. Supply Voltage: Single 5V range 4.75V ~ 5.25V 6. Typical Power Consumption: 50mW, quiescent current 10mA typical 7. Selectable Line Bit Rate: 80 kbps / 160 kbps 8. Transmission Medium: Single standard twisted pair, max transmission distance 4km 9. Transmission Mode: Full-duplex with adaptive echo cancellation, differential biphase line coding 10. Digital Bus Interface: MITEL ST-BUS compatible, standard ISDN 2B+D frame format 11. Integrated Modules: Adaptive echo canceller, frame synchronizer, clock extraction PLL, line transceiver 12. Operating Temperature: -40℃ ~ +85℃ 13. Mounting Type: Surface-mount SMT assembly 14. Compliance: RoHS & halogen-free, industrial communication grade reliability

1. Full-duplex high-speed transmission over single twisted pair Integrated adaptive echo canceller eliminates transmit-receive crosstalk completely, supporting stable bidirectional 80/160 kbps data transmission with only one twisted pair, cutting wiring expenses. 2. Native ISDN standard compatibility Hardware intrinsically supports ISDN basic rate 2B+D frame structure, built-in frame sync and clock extraction PLL, connecting digital PABX and NT1 network terminal without extra external logic. 3. Dual selectable line rate modes Hardware pin configurable for 80 kbps or 160 kbps: 160 kbps for short-distance high bandwidth, 80 kbps for 4km long-distance stable transmission. 4. Transparent modem pass-through capability Supports transparent data transmission for asynchronous & synchronous serial data, ideal for industrial short-range high-speed data tunneling devices. 5. Standard ST-BUS digital interface Industry unified ST-BUS bus enables seamless cascade with voice codec, DTMF transceiver and host DSP, simplifying peripheral circuit design of digital communication line cards. 6. Low-power single-supply design Only single 5V power rail required, typical power consumption 50mW, suitable for 24/7 running communication terminals and industrial remote data collectors. 7. Wide-temperature industrial robustness Continuous stable operation from -40℃ to +85℃, with robust immunity to line surge and differential signal interference, applicable to equipment room and outdoor industrial measurement scenarios.

1. ISDN narrowband communication equipment ISDN NT1 network terminal, digital PABX subscriber line card, main interface unit for digital telephone sets 2. Short-distance twisted-pair high-speed modems Industrial workshop 4km-range high-speed data tunneling modem, security multi-channel twisted-pair signal transmission module 3. Wired voice gateway & VoIP auxiliary line cards Trunk interface for voice switch, digital line processing unit of IP phone adapter, line acquisition module for telephone recording system 4. Industrial remote measurement & control communication PLC remote IO twisted-pair communication node, wired data transmission unit for construction machinery, local monitoring twisted-pair interface of energy storage equipment 5. Special wired data transmission terminals Digital intercom system for campus & building complex, low-speed digital communication module inside rail transit vehicles