Analog Devices Inc. ADSP-2171BSTZ-133

Overview

ADSP-2171BSTZ-133 from Analog Devices is a 33 MIPS, 30 ns instruction-cycle 16-bit fixed-point DSP microcomputer with dual serial ports, 8/16-bit host interface port, 2K × 24-bit on-chip program RAM, 2K × 16-bit data RAM, and powerdown mode consuming <0.55 mW. It executes single-cycle instructions while concurrently handling serial I/O, timer decrement, and address generation - deployed in real-time audio codecs and telecom channel banks.

For engineers reviewing the ADSP-2171BSTZ-133 datasheet, ADSP-2171BSTZ-133 pinout, ADSP-2171BSTZ-133 application, or ADSP-2171BSTZ-133 equivalent, key selection criteria include 128-pin TQFP package compatibility, 5.0 V operation, 33 MIPS throughput, Bus Grant Hang Logic support, and boot-from-EPROM capability via 8-bit external data bus.

Technical Context

The ADSP-2171BSTZ-133 implements the ADSP-2100 base architecture with three parallel computational units (ALU, MAC, shifter), two independent DAGs, and zero-overhead looping. Its instruction set adds bit manipulation (set/clear/toggle/test), x² multiplication, biased rounding, and global interrupt masking - enabling efficient FIR filtering and protocol stack processing in embedded systems.

It supports asynchronous host interfacing via 16-pin multiplexed or separate 8/16-bit HIP with BMODE-selectable boot source (EPROM or host), programmable wait states for slow memories, and dual SPORTs with hardware A-law/µ-law companding per CCITT G.711 - all operating concurrently with internal memory access and timer functions.

Key Specifications

Pinout & Package

ADSP-2171BSTZ-133 is housed in a 128-lead LQFP (Low-profile Quad Flat Package) with 0.4 mm pitch, RoHS-compliant lead finish, and thermal pad exposed on underside for enhanced heat dissipation in high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2171BSTZ-133, ADSP-2172BSTZ-133 adds mask-programmed ROM for secure boot without changing PCB layout, while TMS320C549PGE offers higher speed at the cost of software rework and mechanical redesign.

Availability

ADSP-2171BSTZ-133 is available at Aetrix Electronics and suitable for voice codec systems, telecom channel banks, industrial motor controllers, and portable medical monitors requiring stable component supply across extended product lifecycles.

Supply support for ADSP-2171BSTZ-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 is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies since 1965.

The ADSP-217x product line was engineered for cost-sensitive, low-power embedded DSP applications including telephony, audio processing, and industrial control - emphasizing single-cycle determinism, integrated peripherals, and flexible boot options.

FAQ

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

The ADSP-2171BSTZ-133 operates at a 30 ns instruction cycle time (33 MIPS) with a 16.67 MHz crystal input at 5.0 V nominal supply. It is rated for 4.75 V to 5.25 V operation and does not support 3.3 V supply - that voltage grade is exclusive to the ADSP-2173 variant. The device requires stable VDD within this range to maintain timing compliance and avoid undefined behavior in the ALU or memory subsystem.

Does the ADSP-2171BSTZ-133 support booting from external memory, and what interface does it use?

Yes, the ADSP-2171BSTZ-133 supports automatic booting from byte-wide external EPROM (e.g., 27C64, 27C128) via its 24-bit data bus and 14-bit address bus after reset. The boot mode is selected by the BMODE pin: logic 0 configures EPROM boot, while logic 1 enables host interface port loading. Seven wait states are generated automatically to accommodate 200 ns EPROM access time, eliminating need for external wait-state logic.

How many serial communication interfaces does the ADSP-2171BSTZ-133 integrate, and what protocols do they support?

The ADSP-2171BSTZ-133 integrates two fully independent synchronous serial ports (SPORT0 and SPORT1), each with separate double-buffered transmit and receive sections. They support frame-synchronized or frameless operation, 3–16-bit word lengths, and hardware A-law/µ-law companding per CCITT G.711. SPORT0 additionally supports multichannel TDM with 24/32-word time slots, while SPORT1 can be reconfigured to provide two external interrupt inputs (IRQ0/IRQ1) alongside flag I/O.

What power management features are implemented in the ADSP-2171BSTZ-133 for battery-operated devices?

The ADSP-2171BSTZ-133 implements three low-power modes: Powerdown (<0.55 mW, 100-cycle wake-up), Idle (clock-gated, interrupt-wakeup), and Slow Idle (programmable clock divisor of 16/32/64/128). Powerdown is entered via PWD pin or software bit, with PWDACK confirming entry. All modes preserve register contents and support context restore, making them suitable for intermittent-sampling applications like portable audio recorders or wireless sensors.

Is the ADSP-2171BSTZ-133 pin-compatible with other members of the ADSP-217x family, and what are the key shared characteristics?

Yes, the ADSP-2171BSTZ-133 is pin-compatible with ADSP-2172BSTZ-133 and ADSP-2173BSTZ-133 in the 128-lead TQFP package. All share identical pin functions, electrical characteristics (except supply voltage), memory map, instruction set, and peripheral registers. The primary differences are: ADSP-2172 includes 8K × 24-bit ROM; ADSP-2173 operates at 3.3 V with 50 ns cycle time; ADSP-2171 uses 5.0 V and has no ROM - making it the baseline variant for EPROM-booted designs.