Infineon Technologies PEF 4268 T V1.2

Overview

PEF 4268 T V1.2 from Infineon Technologies is a ringing Subscriber Line Interface Circuit (SLIC) with integrated DC/DC converter, designed for POTS line interface in CPE systems. It generates up to −150 V DC feed and 85 V_rms sinusoidal ringing from a single 9–40 V unregulated supply, supports programmable DC feed, transversal current sensing, and ITDF-compliant diagnostics.

For engineers reviewing the PEF 4268 T V1.2 datasheet, PEF 4268 T V1.2 pinout, PEF 4268 T V1.2 application, or PEF 4268 T V1.2 equivalent, key selection criteria include integrated high-voltage DC/DC capability, GR-909 test support, SLIC-Codec interface compatibility with VINETIC-2CPE and DuSLIC, and thermal efficiency enabled by patented ring mode.

Technical Context

The PEF 4268 T V1.2 implements a fully integrated SLIC architecture with on-chip buck-boost DC/DC converter delivering −150 V DC feed and ±85 V_rms ringing. Its patented ring mode dynamically reduces quiescent current during ringing, lowering chip temperature and system power draw without compromising line voltage integrity.

It features dual interface support: backward-compatible SLIC-S/E/P codec interface and updated VINETIC-2CPE interface. Synchronization of up to eight devices enables multi-line VoIP gateway scalability, while transversal current sensing and ITDF enable automated line fault detection per GR-909.

Key Specifications

Pinout & Package

Package: P-DSO-24-8 (24-pin exposed pad SOIC, 8 mm × 12 mm body, 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SLIC applications.

Compared with PEB 4265, PEF 4268 T V1.2 reduces external component count by ≥70% and cuts ringing-phase power by >40%; versus PEF 4268 F, it trades package size and debug capability for lower assembly cost and smaller PCB footprint in space-constrained ATAs.

Availability

PEF 4268 T V1.2 is available at Aetrix Electronics and suitable for Analog Telephone Adapters, VoIP Gateways, and xDSL Customer Premises Equipment requiring stable component supply, long-term lifecycle support, and GR-909-compliant diagnostics.

Supply support for PEF 4268 T V1.2 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, and communications ICs, with global R&D and manufacturing operations.

The SLIC-DC product line targets cost-optimized, high-integration voice line interface solutions for CPE, focusing on eliminating external HV components and enabling single-supply VoIP and xDSL systems.

FAQ

What is the maximum allowable input supply voltage for PEF 4268 T V1.2?

The absolute maximum unregulated supply voltage (VS pin) is 40 V DC. Operation above this risks permanent damage to the internal DC/DC controller and analog circuitry. The recommended operating range is 9–40 V, with optimal thermal performance observed between 12–24 V in typical ATA applications.

Does PEF 4268 T V1.2 support both AC and DC ringing modes?

Yes - it supports programmable sinusoidal AC ringing up to 85 V_rms at 20 Hz, and configurable DC feed from −150 V to −48 V. Ringing waveform shape, amplitude, and frequency are set via SPI register writes; no external oscillator or filter components are required.

Can PEF 4268 T V1.2 be used without Infineon's VINETIC or DuSLIC codecs?

Yes - it operates independently as a standalone SLIC using its native SLIC-S/E/P interface. External microcontrollers can drive it via SPI or parallel bus, provided timing and voltage levels match Infineon's documented interface specifications (e.g., t_CLK, t_SETUP, V_IH/V_IL).

How does the patented ring mode reduce power consumption?

The ring mode disables non-essential analog blocks (e.g., bias generators, amplifiers) during ringing while maintaining critical current paths and voltage regulation. This cuts quiescent current by >40% versus continuous-operation mode, directly lowering junction temperature and improving reliability in sealed CPE enclosures.