Infineon Technologies PSB 21373 H V1.1

Overview

PSB 21373 H V1.1 from Infineon Technologies is a single-chip SCOUT-DX codec with integrated 2-wire data transceiver and full speakerphone support for ISDN terminal equipment. It implements Layer-1 D-channel control, HDLC framing, analog front-end (AFE) with programmable gain, DSP-based echo cancellation, and tone generation (DTMF, call progress). Key specs include 64 kbit/s IOM-2 interface, -40 dBm to +10 dBm line signal range, 16-bit linear PCM audio path, and 128-byte receive/transmit FIFOs. It targets ISDN S/T-interface terminal adapters and digital telephony systems.

For engineers reviewing the PSB 21373 H V1.1 datasheet, PSB 21373 H V1.1 pinout, PSB 21373 H V1.1 application, or PSB 21373 H V1.1 equivalent, this device is selected for ISDN D-channel protocol handling, acoustic echo suppression in speakerphones, synchronous serial audio/data interfacing, and embedded voice processing where low-power, integrated analog/digital signal chain and deterministic HDLC timing are required.

Technical Context

The PSB 21373 H V1.1 integrates three functional domains: a programmable HDLC controller supporting non-auto, transparent, and extended transparent modes; a fully configurable codec with analog front-end (including hybrid interface, anti-aliasing/anti-imaging filters), 16-bit sigma-delta ADC/DAC, and real-time DSP for echo cancellation and AGC; and an IOM-2 serial interface with master/slave monitor channel capability and strobed bit clock synchronization.

Its architecture features dual independent clock domains - one for the microcontroller interface (SCI) and another for the IOM-2 and line interfaces - with internal PLL-based clock generation enabling stable 128 kHz, 256 kHz, and 512 kHz sampling rates. The device supports burst-frame line transmission, C/I command/response signaling per ITU-T I.430, and hardware-accelerated tone generation via four independent signal generators and sequence control logic.

Key Specifications

Pinout & Package

PSB 21373 H V1.1 is housed in a 128-pin LQFP package (20 mm × 20 mm, 0.4 mm pitch) with exposed thermal pad. Pin functions are defined per DS3 Rev. 2002-05-13, Section 1.2 and 1.4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ISDN codec and transceiver applications.

Compared with PSB 21372 H, the PSB 21373 H V1.1 adds deterministic SDX timing control and enhanced CRAM reliability; versus uPD6376, it consolidates three IC functions into one die but increases software complexity due to integrated firmware-driven configuration.

Availability

PSB 21373 H V1.1 is available at Aetrix Electronics and suitable for ISDN terminal adapters, digital conference phones, VoIP gateways, and industrial remote terminal units requiring stable component supply across long-lifecycle deployments.

Supply support for PSB 21373 H V1.1 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, security controllers, and communications solutions.

The PSB 21373 H V1.1 belongs to Infineon's SCOUT-DX product line, designed specifically for integrated ISDN terminal equipment requiring combined line interface, protocol handling, and high-fidelity voice processing in a single chip.

FAQ

What clock sources does the PSB 21373 H V1.1 support for audio sampling?

The device accepts a 16.384 MHz crystal or external clock on the MCLK pin. Its internal PLL generates precise 128 kHz, 256 kHz, and 512 kHz clocks for IOM-2 frame timing and audio sampling, ensuring strict ITU-T I.430 synchronization without external frequency synthesizers.

How is speakerphone echo cancellation configured and updated in real time?

Echo cancellation uses a 128-tap adaptive FIR filter stored in CRAM. Coefficients are updated dynamically via background noise monitoring and speech detection logic. New profiles can be loaded through indirect programming (SOP/COP commands) without interrupting active calls or requiring reset.

Does the PSB 21373 H V1.1 support both master and slave operation on the IOM-2 interface?

Yes - the IOM-2 interface supports both master and slave modes. In master mode, it drives the IOM clock and frame sync; in slave mode, it synchronizes to an external IOM controller. The monitor channel operates independently in either configuration, enabling passive bus observation.

What is the maximum line loop loss the PSB 21373 H V1.1 can handle while maintaining reliable D-channel activation?

The device guarantees successful D-channel activation and Layer-1 synchronization up to 40 dB loop loss, verified per ITU-T I.430 Annex A test conditions. This is enabled by programmable receiver sensitivity (-40 dBm minimum input), adaptive equalization, and robust C/I command timing margins.