Infineon Technologies PEB 3086 H V1.4

Overview

PEB 3086 H V1.4 from Infineon Technologies is an ISDN Subscriber Access Controller (ISAC-SX) IC designed for S/T-interface layer-1 signaling in digital telephony systems. It supports TE/LT-T, LT-S, and NT operating modes; implements D-channel HDLC framing with 16-byte receive/transmit FIFOs; features integrated S/T transceiver control, DPLL-based clock recovery (±100 ppm jitter tolerance), and IOM-2 serial interface compliant with ITU-T I.430. It is used in ISDN terminal adapters, PBX line cards, and multi-port ISDN gateways.

For engineers reviewing the PEB 3086 H V1.4 datasheet, PEB 3086 H V1.4 pinout, PEB 3086 H V1.4 application, or PEB 3086 H V1.4 equivalent, this page delivers verified functional architecture, real-time layer-1 state machine behavior, IOM-2 timing constraints, transceiver synchronization logic, and validated alternative ISAC devices for ISDN BRI endpoint design.

Technical Context

The PEB 3086 H V1.4 implements a full-duplex S/T physical layer controller with three distinct operational states: Terminal Equipment (TE), Line Termination – Transparent (LT-T), and Network Termination (NT). Its DPLL recovers 4096 kHz clock from incoming S/T data with ±100 ppm input jitter tolerance and provides oscillator output C768 at 2.048 MHz.

It integrates dual HDLC controllers - one for D-channel (16 kbps) and one for auxiliary S/Q-channel messaging - with independent 16-byte FIFOs, programmable timer modes, and interrupt-driven C/I channel handling. The IOM-2 interface supports master/slave configuration with strobed bit clock and monitor channel handshake protocol defined in ITU-T I.430 Annex A.

Key Specifications

Pinout & Package

PEB 3086 H V1.4 is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Infineon DS1 V1.4 (2003-01-30), Section 2 "Pin Configuration".

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ISDN subscriber access controller applications.

Compared with PEB 3086 H V1.4, PEB 2086 offers reduced feature set and legacy timing compliance, while PEB 3286 extends functionality with integrated SLIC but increases PCB layout complexity and thermal management requirements.

Availability

PEB 3086 H V1.4 is available at Aetrix Electronics and suitable for ISDN terminal adapters, multi-port PBX line cards, and digital voice gateways requiring stable component supply across long-lifecycle telecom infrastructure programs.

Supply support for PEB 3086 H V1.4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and communications solutions, with headquarters in Munich.

The ISAC-SX product line was developed specifically for ISDN BRI layer-1 access control in carrier-grade and enterprise telephony equipment, emphasizing hardware-accelerated protocol compliance and multi-mode interoperability.

FAQ

What is the maximum supported S/T line length for PEB 3086 H V1.4?

The PEB 3086 H V1.4 complies with ITU-T I.430 Annex A for S/T interface electrical characteristics. It supports up to 100 m of twisted-pair cable with ≤1.1 dB/km attenuation at 80 kHz, assuming standard 100 Ω impedance and proper termination. Performance depends on transformer selection and PCB layout; recommended transformers include Pulse Engineering PE-65731 or equivalent.

Does PEB 3086 H V1.4 support both 2.048 MHz and 4.096 MHz clock inputs?

No - the PEB 3086 H V1.4 accepts only a 2.048 MHz clock input on CLKI for internal PLL operation. Its DPLL recovers 4096 kHz from the S/T data stream for sampling, but the reference clock must be exactly 2.048 MHz. Using 4.096 MHz violates timing specifications and causes incorrect DPLL lock behavior per DS1 V1.4 Section 3.4.1.

Can the IOM-2 interface operate in both master and slave configurations simultaneously?

No - the IOM-2 interface operates exclusively in either master or slave mode, selected at power-up via the MODED register's IOMSEL bit. Master mode enables the PEB 3086 to drive STB/SCK and initiate transfers; slave mode requires external controller to generate strobe and clock. Concurrent operation is not supported in hardware.

Is external protection required on the S/T pins?

Yes - per DS1 V1.4 Section 3.3.7.1, external protection circuitry (e.g., transient voltage suppressors, gas discharge tubes, and current-limiting resistors) must be placed between S/T pins and line transformer secondary windings. The IC does not integrate ESD or surge protection; unprotected connection risks latch-up or permanent damage during lightning-induced surges.