Analog Devices Inc. ADSP-2171BST-133

Overview

ADSP-2171BST-133 from Analog Devices is a 5.0 V, 33 MIPS fixed-point DSP microcomputer with three parallel computational units (ALU, MAC, shifter), 2K × 24-bit on-chip program RAM, 2K × 16-bit data RAM, dual serial ports (SPORT0/SPORT1), and an 8-/16-bit host interface port (HIP). It executes every instruction in a single 30 ns cycle and supports zero-overhead looping, bit manipulation, biased rounding, and bus grant hang logic - deployed in real-time audio codecs and telecom line cards.

For engineers reviewing the ADSP-2171BST-133 datasheet, ADSP-2171BST-133 pinout, ADSP-2171BST-133 application, or ADSP-2171BST-133 equivalent, key selection criteria include 128-pin TQFP package compatibility, 30 ns instruction cycle timing at 5.0 V, on-chip memory configuration (no ROM), powerdown mode (<0.55 mW standby), and HIP/SPORT interrupt mapping for embedded control co-processing.

Technical Context

The ADSP-2171BST-133 implements the ADSP-2100 base architecture with enhancements including Bus Grant Hang Logic (BGH), global interrupt masking, and new instructions for bit set/clear/toggle/test, x² multiplication, and biased rounding. Its three independent computational units operate in parallel via the internal R bus, enabling simultaneous address generation, data move, and computation per cycle.

It features two dedicated data address generators (DAG1/DAG2) supporting modulo addressing for circular buffers, programmable 16-bit interval timer with prescaler, and dual SPORTs with hardware A-law/µ-law companding per CCITT G.711. The HIP supports asynchronous 8-/16-bit host communication with configurable strobe and address/data multiplexing modes.

Key Specifications

Pinout & Package

ADSP-2171BST-133 is housed in a 128-lead Thin Quad Flat Package (TQFP) with 0.4 mm lead pitch, compatible with standard surface-mount reflow profiles. Thermal pad exposed on underside for enhanced heat dissipation in high-throughput DSP applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-point DSP microcomputer applications.

Compared with ADSP-2172BST-133, the ADSP-2171BST-133 trades permanent firmware storage for field-programmable flexibility; compared with TMS320C549PGE, it prioritizes deterministic low-latency control and integrated peripheral coherency over raw MIPS, making it better suited for tightly coupled host-DSP systems requiring minimal external logic.

Availability

ADSP-2171BST-133 is available at Aetrix Electronics and suitable for voice codec systems, telecom line cards, and industrial motor controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical and industrial certifications.

Supply support for ADSP-2171BST-133 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The ADSP-217x family was designed as a cost-optimized, low-power evolution of the ADSP-2100 architecture for embedded real-time signal processing in portable and telecom infrastructure applications - emphasizing single-cycle determinism, integrated peripherals, and power-aware operation.

FAQ

What is the maximum operating frequency and voltage specification for the ADSP-2171BST-133?

The ADSP-2171BST-133 operates at a guaranteed 33 MIPS with a 30 ns instruction cycle time when supplied at 5.0 V ± 10%. It requires a 16.67 MHz crystal or TTL-compatible clock input (CLKIN), and its internal timing is fully specified only within the 4.5 V to 5.5 V range. Operation outside this voltage window is not supported and may cause functional failure or data corruption in the ADSP-2171BST-133.

Does the ADSP-2171BST-133 include on-chip program ROM, and how does it differ from the ADSP-2172BST-133?

No, the ADSP-2171BST-133 contains only 2K × 24-bit on-chip program RAM and no internal ROM. This distinguishes it from the ADSP-2172BST-133, which adds 8K × 24-bit program ROM. Both share identical pinout, timing, and instruction set, but the ADSP-2171BST-133 relies on external EPROM or HIP-based loading for firmware - enabling field updates that are impossible with the mask-ROM variant.

How does the Host Interface Port (HIP) of the ADSP-2171BST-133 support interoperability with common microcontrollers?

The HIP of the ADSP-2171BST-133 supports direct connection to MCUs such as the Motorola 68000 and Intel 80C51 via configurable 8-/16-bit mode, separate/multiplexed address/data buses, and flexible strobe logic (RD/WR or RW/DS). Its six memory-mapped data registers (HDR5–0) and dual status registers allow full-duplex mailbox-style communication without CPU intervention - making the ADSP-2171BST-133 appear as a peripheral memory block to the host.

What low-power modes are supported by the ADSP-2171BST-133, and what is the recovery latency from powerdown?

The ADSP-2171BST-133 supports three low-power modes: Powerdown (<0.55 mW), Idle, and Slow Idle. In Powerdown mode, initiated via PWD pin or software, the core enters CMOS standby and resumes execution in ≤100 CLKIN cycles. This 100-cycle recovery is guaranteed across temperature and voltage ranges and applies whether the clock source is crystal or external - a key requirement for battery-powered ADSP-2171BST-133 deployments.

Can the ADSP-2171BST-133 execute code from external memory, and what boot mechanisms are available?

Yes, the ADSP-2171BST-133 supports automatic boot from byte-wide external EPROM (e.g., 27C256) using seven default wait states after reset, with the two MSBs of the data bus serving as boot address bits. It also supports HIP-based initialization, allowing the host processor to write program code directly into on-chip RAM. Stand-alone ROM execution is not supported on the ADSP-2171BST-133 due to absence of internal ROM - all code must be loaded at runtime.