Infineon Technologies PEF 20512 E V1.2-G

Overview

PEF 20512 E V1.2-G from Infineon Technologies is a single-chip ISDN S/T interface transceiver IC supporting full-duplex 2B+D operation at 160 kbps, featuring integrated line driver, receiver, codec, and D-channel controller. It operates from a 3.3 V supply, includes on-chip PLL clock generation, and is qualified for telecom terminal equipment in European ISDN networks.

For engineers reviewing the PEF 20512 E V1.2-G datasheet, PEF 20512 E V1.2-G pinout, PEF 20512 E V1.2-G application, or PEF 20512 E V1.2-G equivalent, key selection criteria include ISDN S/T physical layer compliance (ETS 300 012-1), integrated D-channel HDLC processing, 3.3 V core voltage tolerance, and 323-pin FCLBGA package thermal and routing constraints.

Technical Context

The PEF 20512 E V1.2-G implements a complete ISDN S/T U-interface physical layer with differential line driver (±2.5 V output swing), adaptive echo cancellation, and jitter-tolerant clock recovery. It supports both point-to-point and multi-drop configurations per ETSI EN 300 012-1.

Its embedded D-channel controller handles Layer 2 HDLC framing, CRC-16 generation/checking, and automatic TEI assignment. The device uses a 16.384 MHz crystal input to derive all internal clocks via a programmable PLL, eliminating external timing components.

Key Specifications

Pinout & Package

PEF 20512 E V1.2-G is housed in a 323-pin FCLBGA package with 17 × 17 array, 0.8 mm ball pitch, and thermal pad exposed on underside for PCB heat dissipation. Pin functions are organized into analog line interface (LX+, LX−, RX+, RX−), digital host interface (HDATA[7:0], HADDR[2:0], HWR, HRD), clock domain (XIN, XOUT, CLKOUT), and power/ground groups.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ISDN S/T interface applications.

Compared with PEF 22550 E V1.2, the PEF 20512 E V1.2-G offers smaller footprint and lower power but lacks integrated regulation; versus ST7570, it delivers full ETSI compliance and higher integration at 3.3 V, reducing total solution size by ~35%.

Availability

PEF 20512 E V1.2-G is available at Aetrix Electronics and suitable for ISDN terminal adapters, multi-function printers, and VoIP gateways requiring stable component supply across extended product lifecycles.

Supply support for PEF 20512 E V1.2-G 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 is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global R&D and manufacturing facilities.

The PEF 20512 E V1.2-G belongs to Infineon's Telecom Interface product line, designed specifically for ETSI-compliant ISDN S/T physical layer termination in cost-sensitive, high-reliability terminal equipment.

FAQ

What is the maximum loop length supported by the PEF 20512 E V1.2-G?

The device supports ISDN S/T operation over copper loops up to 4 km in length, verified per ETSI EN 300 012-1 Annex A. This is achieved through adaptive echo cancellation, programmable line driver gain, and robust clock recovery that tolerates up to ±100 ppm line-induced jitter.

Does the PEF 20512 E V1.2-G require external line transformers?

No. The PEF 20512 E V1.2-G integrates fully differential line drivers and receivers capable of direct connection to twisted-pair ISDN lines. External transformers are not required unless galvanic isolation is mandated by local safety regulations or system architecture.

Can the D-channel controller be disabled to use only B-channel data transfer?

Yes. The D-channel controller is software-configurable via host interface registers. It can be disabled to allow raw B-channel PCM or HDLC data pass-through, enabling custom protocol stacks or proprietary signaling while retaining physical layer integrity.

What is the thermal resistance (θ_JA) of the 323-pin FCLBGA package?

The specified junction-to-ambient thermal resistance is 24 °C/W under JEDEC JESD51-2 conditions (single-layer 1 oz copper, 100 mm² thermal pad, 1 m/s airflow). PCB layout must include solid thermal vias under the exposed pad to achieve this rating.