Infineon Technologies PEF 20550 H V2.1

Overview

PEF 20550 H V2.1 from Siemens AG is an Extended Line Card Interface Controller (ELIC®) IC designed for digital telephony line card systems, supporting up to 32 subscriber channels, integrated SACCO HDLC controllers, and D-channel arbitration for ISDN PRI/BRI applications. It features PCM interface with 8-bit/32-slot configuration, CFI configurable serial interface, boundary-scan (JTAG) compliance per IEEE 1149.1, and operates across extended industrial temperature range (–40°C to +85°C).

For engineers reviewing the PEF 20550 H V2.1 datasheet, PEF 20550 H V2.1 pinout, PEF 20550 H V2.1 application in ISDN line cards or DECT base stations, or PEF 20550 H V2.1 equivalent for legacy telecom controller replacement, this page delivers verified functional architecture, register-mapped timing behavior, and system-level integration guidance.

Technical Context

The PEF 20550 H V2.1 implements a multi-layered communications controller architecture comprising three core functional blocks: EPIC®-1 (PCM and Configurable Frame Interface), dual SACCO-A/B HDLC protocol engines with FIFO-based DMA and interrupt modes, and a programmable D-channel arbiter for time-division multiplexed D-channel access across 32 subscribers. Its bus interface supports 8-bit parallel microprocessor access with address/data multiplexing and asynchronous handshake control.

It integrates boundary-scan test logic (TAP controller, ID code 0x130 for V1.3/V2.1), watchdog timer with software-reset capability, dual parallel I/O ports (PORT0/PORT1), and internal reference clock generation via CRCL (CFI Reference Clock). All registers are memory-mapped with documented address layout and bit-field definitions for precise firmware initialization.

Key Specifications

Pinout & Package

PEF 20550 H V2.1 is housed in a 128-pin plastic quad flat package (PQFP) with 0.4 mm lead pitch, compliant with JEDEC MS-026. Pin functions are defined per top-view configuration in Siemens User's Manual 01.96, Section 1.2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar line card interface controller applications.

Compared with PEB 20550 H V2.1 and PEF 20550 V1.3, the PEF 20550 H V2.1 uniquely supports CRCL-driven CFI flexibility and extended temperature operation - making it the sole choice for new DECT base station designs and outdoor telecom equipment.

Availability

PEF 20550 H V2.1 is available at Aetrix Electronics and suitable for ISDN PRI line cards, DECT base station controllers, key system expansion modules, and hybrid analog/digital line cards requiring stable component supply across long-life telecom deployments.

Supply support for PEF 20550 H V2.1 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

Siemens AG Semiconductor Group (now Infineon Technologies) was a leading European semiconductor manufacturer specializing in industrial, automotive, and telecommunications ICs before its semiconductor division spun off in 1999.

The PEF 20550 belongs to the ELIC® product line, engineered specifically for carrier-grade digital line card architectures requiring deterministic D-channel arbitration, hardware-accelerated PCM switching, and multi-protocol serial interface adaptability.

FAQ

What is the function of the CRCL pin on the PEF 20550 H V2.1?

The CRCL (CFI Reference Clock) pin replaces the legacy RCL input and serves as the master timing source for the Configurable Frame Interface. It drives internal clock dividers that generate bit-rate clocks for SACCO-A/B and CFI serial operations. Unlike RCL, CRCL supports dynamic reconfiguration during runtime via CMD2 register writes, enabling adaptive frame rate changes without hardware reset.

Does the PEF 20550 H V2.1 support JTAG boundary scan for production testing?

Yes, the PEF 20550 H V2.1 fully complies with IEEE 1149.1 boundary scan. Its TAP controller implements a 22-bit instruction register and supports IDCODE (0x130), SAMPLE/PRELOAD, EXTEST, and INTEST instructions. The boundary-scan chain covers all primary I/O pins and internal register access paths, enabling board-level fault isolation and solder-joint verification in automated test equipment.

How many HDLC controllers does the PEF 20550 H V2.1 integrate?

The PEF 20550 H V2.1 integrates two independent SACCO HDLC controllers labeled SACCO-A and SACCO-B. Each supports full-duplex HDLC with programmable CRC-16 polynomial, automatic flag insertion/deletion, abort sequence generation, and configurable frame length. They operate concurrently and can be assigned to separate D-channels or used in redundant configurations.

Can the PEF 20550 H V2.1 replace the PEF 20550 V1.3 in existing designs?

Yes, but only if the design does not rely on legacy RCL clocking or requires DECT-specific timing modes introduced in V2.1. The V2.1 revision adds CRCL support, extended temperature range (–40°C to +85°C), and updated VNSR register behavior for VN3..0 bits. Designs using RCL or operating outside –40°C to +85°C must verify timing margins and register initialization sequences before substitution.