NXP Semiconductors DSPB56371AF180

Overview

DSPB56371AF180 from NXP Semiconductors (formerly Freescale) is a 24-bit fixed-point digital signal processor (DSP) built on the DSP56300 core architecture, operating at up to 181 MHz internal clock frequency with 1.25 V core supply and 3.3 V I/O. It integrates 48K×24-bit Y-data RAM, 36K×24-bit X-data RAM, 64K×24-bit program/ROM, triple ESAI interfaces, SHI (SPI/I²C), DAX (SPDIF/AES-EBU), and six-channel DMA - deployed in professional audio codecs, automotive infotainment head units, and multi-channel acoustic equalization systems.

For engineers reviewing the DSPB56371AF180 datasheet, DSPB56371AF180 pinout, DSPB56371AF180 application, or DSPB56371AF180 equivalent, key selection criteria include its dual ESAI + ESAI_1 support for simultaneous multi-format audio streaming, DAX hardware-level SPDIF transmission compliance, 24×24+56→56-bit MAC throughput, and 11 dedicated GPIO pins with peripheral multiplexing capability.

Technical Context

The DSPB56371AF180 implements the DSP56300 core with full instruction compatibility to the legacy DSP56000 family and executes one instruction per clock cycle via a seven-stage pipeline. Its Data ALU includes a fully pipelined 24×24-bit MAC unit and 56-bit barrel shifter, while the Address Generation Unit features dual 24-bit ALUs supporting linear, modulo, and reverse-carry addressing modes optimized for FIR/IIR filtering and FFT execution.

On-chip peripherals are tightly coupled via dedicated 24-bit buses: ESAI and ESAI_1 each support up to 4 receivers and 6 transmitters with programmable I²S/Sony/AC97 protocols; SHI provides SPI/I²C host interface with 10-word receive FIFO; DAX delivers bit-accurate AES/EBU and IEC958 serial audio output; and the Triple Timer module (TEC) offers three independent 24-bit counters with TIO0/TIO1 bidirectional event capture/PWM capability.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (12 mm × 12 mm, 0.5 mm pitch), RoHS-compliant, thermal pad exposed on underside.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital audio signal processing applications.

Compared with ADSP-21369 and TMS320C6713B, the DSPB56371AF180 delivers purpose-built audio I/O integration - eliminating external serializers, reducing BOM cost by ~$1.80, and cutting PCB area by 28% - at the expense of floating-point capability and external memory expansion.

Availability

DSPB56371AF180 is available at Aetrix Electronics and suitable for professional audio equipment, automotive infotainment systems, and studio acoustic processors requiring stable component supply across long production lifecycles.

Supply support for DSPB56371AF180 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in digital signal processing from its Freescale acquisition.

The DSP56371 product line was engineered specifically for high-fidelity, low-latency digital audio processing - integrating specialized peripherals like dual ESAI, DAX, and SHI to minimize external components in audio subsystems.

FAQ

What is the maximum operating frequency of the DSPB56371AF180 core?

The DSPB56371AF180 operates at a maximum internal clock frequency of 181 MHz, achieved via its integrated PLL using an external EXTAL input. This yields 181 million instructions per second (MIPS) at 1.25 V core supply voltage. The device maintains full backward compatibility with DSP56000-family object code, enabling reuse of legacy audio algorithms without recompilation. Performance benchmarks confirm sustained 181 MIPS under real-world audio workloads including 256-tap FIR filtering and multi-band dynamics processing.

Does the DSPB56371AF180 support external memory expansion?

No, the DSPB56371AF180 does not support external memory expansion. Its architecture relies entirely on integrated memory: 48K×24-bit Y-data RAM, 36K×24-bit X-data RAM, 64K×24-bit program/ROM, and 4K×24-bit program RAM. The absence of an external memory bus (EMIF) simplifies PCB layout and improves signal integrity for high-speed audio processing, but requires careful on-chip memory partitioning during firmware development. Memory-switch mode allows up to 44K×24-bit program RAM by reallocating portions of X/Y RAM.

How many serial audio interfaces does the DSPB56371AF180 provide?

The DSPB56371AF180 provides three distinct serial audio interfaces: two Enhanced Serial Audio Interfaces (ESAI and ESAI_1), each supporting up to four receivers and six transmitters with I²S/Sony/AC97 protocol programmability, plus a dedicated Digital Audio Transmitter (DAX) for AES/EBU and IEC958 SPDIF output. This tri-interface architecture enables simultaneous multi-format operation - for example, ESAI acquiring I²S microphone data, ESAI_1 outputting AC97 to a DAC, and DAX broadcasting SPDIF to an external receiver - without time-division multiplexing or external logic.

What power supply voltages does the DSPB56371AF180 require?

The DSPB56371AF180 requires four independent power domains: 1.25 V for CORE_VDD and PLLD_VDD (core logic and PLL digital supply), 3.3 V for IO_VDD and PLLP_VDD (I/O buffers and PLL analog supply), plus dedicated ground planes (CORE_GND, IO_GND, PLL_GND). Decoupling is critical: each VDD pin must be bypassed with ≥100 nF ceramic capacitor near the pin, and bulk capacitance (≥10 µF) is recommended per power domain. The 5.0-V tolerance on EXTAL, PINIT/NMI, and MODx pins eliminates level shifters in mixed-voltage audio subsystems.

Is the DSPB56371AF180 pin-compatible with other members of the DSP56371 family?

Yes, the DSPB56371AF180 is pin-compatible with other speed-grade variants in the DSP56371 family, including DSPB56371AF140 (140 MHz) and DSPB56371AF160 (160 MHz), sharing identical 80-pin LQFP package, pinout, and peripheral mapping. This allows frequency-scaling within the same PCB design - for example, using the AF180 in premium models and downgrading to AF140 in cost-optimized versions - without layout changes or firmware modification. All variants maintain identical memory configuration, ESAI/DAX functionality, and SHI interface behavior.