PEF 20451 E V1.3

Telecom Overview

The Infineon PEF 20451 HTSI is a Switching IC (SWITI) designed for wired communications, specifically serving as a Time-Division Multiplexing (TDM) switch. It supports H-Bus interfaces compliant with ITU-T H.100 and H.110 standards, enabling integration into digital telephony systems. The device features a local PCM bus interface for connection to baseband processors and includes a comprehensive microprocessor interface for configuration. Key architectural elements include a switching factory capable of various connection modes, an analog PLL for clock generation, and hardware reset capabilities. The component is housed in a P-BGA-217-1 package.

Telecom Feature Summary

• Supports multiple switching modes including minimum delay, constant delay, subchannel, multipoint, broadcast, bidirectional, and stream-to-stream connections.
• Integrates an Analog Phase-Locked Loop (APLL) with master-slave selection and automatic clock fallback mechanisms for synchronization stability.
• Provides flexible interface options including H-Bus (H.100/H.110), parallel/local PCM bus, and standard microprocessor buses (Intel/Siemens or Motorola).
• Includes JTAG boundary scan support for manufacturing test access and internal identification codes accessible via the microprocessor interface.

Telecom Applications

• Standard Private Branch Exchange (PBX) or Central Office (CO) applications
• Computer Telephony Integration (CTI) systems
• Routers and remote access servers
• Voice over IP (VoIP) gateways

Telecom Procurement Notes

Verify the specific ordering suffix against current Infineon documentation, as the provided datasheet is dated November 2001 and marked preliminary. Confirm package availability and lead times directly with authorized distributors or Infineon sales offices, as this component may be obsolete or superseded by newer generations within the SWITI family.

Telecom Selection Notes

Select the PEF 20451 when designing systems requiring H.100 or H.110 bus interoperability and TDM switching capabilities. Ensure the host processor supports the required microprocessor interface modes (8-bit or 16-bit, multiplexed or demultiplexed). Evaluate the need for specific switching modes like subchannel or broadcast to determine if this device meets the traffic matrix requirements compared to other SWITI variants.

Telecom Part Context

The PEF 20451 belongs to the SWITI (Switching IC) family, which also includes the PEF 20471 and PEF 24471 models. These devices are engineered for high-performance time-division switching in telecommunications infrastructure. The family shares common architectural principles but differs in pin counts, interface densities, and specific feature sets tailored to different system scales.

Telecom Replacement Considerations

Consult Infineon's current product portfolio for modern replacements, as the 2001 datasheet indicates this is a legacy part. Newer generations of telecom switching ICs may offer enhanced performance or integrated features. Verify compatibility with existing board layouts and software drivers before considering any alternative components.