Infineon Technologies PEF 20450 H V1.3

Overview

PEF 20450 H V1.3 from Infineon Technologies is a single-chip PCM (Pulse Code Modulation) switching IC for digital telephony infrastructure, implementing time-slot interchanging in TDM-based systems with up to 256 × 256 full-duplex connections. It supports 8-bit, 4-bit, 2-bit, and 1-bit subchannel switching, broadcast/multipoint modes, and integrates an analog PLL clock generator with jitter transfer compliance per ITU-T G.736. Used in PBX, central office (CO), and access multiplexer line cards.

For engineers reviewing the PEF 20450 H V1.3 datasheet, PEF 20450 H V1.3 pinout, PEF 20450 H V1.3 application, or PEF 20450 H V1.3 equivalent, key selection criteria include PCM interface timing compatibility (TDM frame rates up to 2.048 MHz), hardware reset behavior per Section 3.7.1, interrupt handling via ISTA1/IESTA1 registers, and configuration flexibility through indirect register addressing for dynamic connection setup.

Technical Context

The PEF 20450 H V1.3 implements a fully programmable switching fabric with three operational modes: minimum/constant delay, subchannel, and message mode - each configurable via CMD1/CMD2 registers. Its integrated analog PLL (APLL) accepts 2.048 MHz or 4.096 MHz reference inputs and generates synchronized local clocks with phase alignment capability per Section 3.4.3.

It features dual interface support: an 8-/16-bit microprocessor bus (Intel/Motorola modes, multiplexed/de-multiplexed) and a parallel PCM bus supporting both master and slave operation. Interrupt status (ISTA1) and error masking (INTEM1/INTEM2) are handled via dedicated 8-bit registers mapped to the µP interface, enabling real-time fault detection and recovery in carrier-grade systems.

Key Specifications

Pinout & Package

PEF 20450 H V1.3 is housed in a 144-pin LQFP (Low-Profile Quad Flat Package) with 0.5 mm pitch, measuring 20 mm × 20 mm. The package supports standard surface-mount reflow profiles and includes dedicated power/ground pins for analog and digital domains to minimize noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PEF 20450 H V1.3, the PEF 20470 offers double switching capacity at higher power and cost, while the PEF 24470 trades raw performance for robustness on aging hardware - making the PEF 20450 the optimal balance of density, jitter performance, and integration for mainstream digital line cards.

Availability

PEF 20450 H V1.3 is available at Aetrix Electronics and suitable for IP-PBX line cards, digital access multiplexers, and central office switch shelves requiring stable component supply across long-lifecycle telecom deployments.

Supply support for PEF 20450 H V1.3 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 wired communications ICs, with headquarters in Munich and global R&D centers.

The PEF 20450 belongs to Infineon's SWITI (Switching IC) product line, designed specifically for TDM-based digital telephony infrastructure requiring high-reliability time-slot interchange, jitter-cleansing clock generation, and seamless µP integration.

FAQ

What is the maximum supported PCM frame rate for PEF 20450 H V1.3?

The device supports standard E1 (2.048 Mbps) and T1 (1.544 Mbps) frame rates, with PCM_CLK output configurable up to 8.192 MHz for multi-frame structures. Frame sync (PCM_FS) operates at 8 kHz for E1 and 6.3 kHz for T1, as verified in Section 7.1 timing diagrams and Table 22 of the preliminary datasheet.

Does PEF 20450 H V1.3 require external crystal loading capacitors?

Yes - the integrated crystal oscillator requires two external 15 pF ±5% NP0 ceramic capacitors connected between CLKIN and ground, as specified in Section 8.3 and Figure 6 of the datasheet. These ensure stable oscillation at 2.048 MHz and meet frequency tolerance requirements for SS7 and ISDN applications.

How does the hardware reset sequence affect PLL lock acquisition?

Upon assertion of the RESET pin, the APLL is held in reset until release, then requires 5–10 ms to achieve lock, as defined in Section 7.5 "Hardware Reset Timing." During this period, PCM_CLK remains inactive, and all switching operations are suspended until LOCK status is confirmed via register bit ISTA1.7.

Can PEF 20450 H V1.3 perform simultaneous read and write on the same time-slot?

No - the switching fabric operates in strict time-division mode: each time-slot is either sourced (write) or sunk (read) per frame, not both. Simultaneous bidirectional operation is achieved only across different slots (e.g., slot 16 write → slot 24 read), as described in Section 3.3.1.5 and Figure 5 "Bidirectional Mode."