Analog Devices Inc. ADSP-2171KST-133

Overview

ADSP-2171KST-133 from Analog Devices is a 33 MIPS, 30 ns instruction-cycle DSP microcomputer with 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 operates at 5.0 V and targets real-time audio processing, telecom channel banks, and embedded control systems requiring deterministic low-latency computation.

For engineers reviewing the ADSP-2171KST-133 datasheet, ADSP-2171KST-133 pinout, ADSP-2171KST-133 application, or ADSP-2171KST-133 equivalent, key selection criteria include its 128-pin TQFP package, bus grant hang logic (BGH), powerdown mode (<0.55 mW standby), single-cycle instruction execution, and ADSP-2100 family code compatibility with enhanced bit manipulation and biased rounding instructions.

Technical Context

The ADSP-2171KST-133 implements the ADSP-2100 base architecture with three parallel computational units (ALU, MAC, shifter), two independent DAGs for simultaneous dual-operand fetches, and a zero-overhead loop-capable program sequencer. Its internal R bus enables result forwarding between units in one cycle.

It supports external memory expansion via shared PMA/DMA and PMD/DMD buses, programmable wait states for slow peripherals, and asynchronous HIP operation with configurable 8-/16-bit width and multiplexed/separate address/data modes. The device features eleven interrupts-including three edge/level-sensitive external IRQs-and nonmaskable powerdown interrupt handling with 12-level nested stacks.

Key Specifications

Pinout & Package

ADSP-2171KST-133 is housed in a 128-lead thin quad flat package (TQFP) with 0.4 mm lead pitch, thermally enhanced for industrial ambient operation. Pin functions are electrically and physically defined per Analog Devices' ADSP-217x Pin List (Rev. A).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2171KST-133, the ADSP-2171KSTZ-133 offers identical performance in a RoHS-compliant package, while the ADSP-2172KST-133 adds 8K words of ROM for self-contained boot-making it preferable for systems requiring guaranteed boot integrity without external memory.

Availability

ADSP-2171KST-133 is available at Aetrix Electronics and suitable for voice codec systems, telecom channel banks, industrial motor controllers, and audio effects processors requiring stable component supply across extended production lifecycles.

Supply support for ADSP-2171KST-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 global semiconductor leader specializing in high-performance analog, mixed-signal, and DSP technologies for precision signal processing applications.

The ADSP-217x product line was engineered as a low-power, single-chip DSP microcomputer family targeting real-time embedded systems where deterministic latency, code density, and peripheral integration are critical-especially in portable and telecom infrastructure equipment.

FAQ

What is the maximum operating frequency and instruction throughput of the ADSP-2171KST-133?

The ADSP-2171KST-133 operates at a 30 ns instruction cycle time, delivering 33 million instructions per second (MIPS) when driven by a 16.67 MHz crystal at 5.0 V. Every instruction-including arithmetic, data moves, and conditional operations-executes in a single cycle. This throughput is fixed by the internal architecture and cannot be increased beyond 33 MIPS under specified voltage and temperature conditions. The ADSP-2171KST-133 does not support PLL-based frequency multiplication.

Does the ADSP-2171KST-133 support 3.3 V operation?

No, the ADSP-2171KST-133 is rated exclusively for 5.0 V operation and is not compatible with 3.3 V supply rails. It belongs to the ADSP-2171/2172 variant group designed for 5.0 V applications; the 3.3 V counterpart is the ADSP-2173. Applying 3.3 V to the ADSP-2171KST-133 will result in insufficient internal biasing, failed boot sequences, and undefined behavior. Always verify VDD = 4.75–5.25 V per the Absolute Maximum Ratings table.

How does the Bus Grant Hang Logic (BGH) function in the ADSP-2171KST-133?

The Bus Grant Hang Logic (BGH) in the ADSP-2171KST-133 prevents system deadlock during external bus arbitration by asserting the BGH output when the processor detects a stalled bus grant sequence-such as missing or delayed BG acknowledgment after BR assertion. This signal alerts external logic to reset or reinitialize the bus controller. BGH is active only in Go Mode and does not affect normal execution; it ensures robust multi-processor or DMA coexistence without software intervention. The ADSP-2171KST-133 requires no firmware handling of BGH-it is fully hardware-managed.

Can the ADSP-2171KST-133 execute code directly from external memory?

No, the ADSP-2171KST-133 cannot execute instructions directly from external memory. Its program memory interface supports only data transfers to/from external devices; all code execution must occur from on-chip 2K × 24-bit program RAM. Boot loading from external EPROM (e.g., 27C256) is supported, but that code is copied into internal RAM before execution. External memory access is limited to data reads/writes using PMS/DMS/BMS controls-no instruction fetch path exists off-chip.

What are the power consumption characteristics of the ADSP-2171KST-133 in active and standby modes?

In active operation at 5.0 V and 30 ns cycle time, the ADSP-2171KST-133 dissipates 300 mW typical. In powerdown mode, it draws less than 0.55 mW with 100-cycle recovery latency. Idle and Slow Idle modes offer intermediate savings: Idle halts the core clock while preserving register state, and Slow Idle reduces internal clock frequency by factors of 16/32/64/128. All low-power states retain full interrupt responsiveness and context integrity-no software reinitialization is needed upon wake-up. The PWD pin and software powerdown force bit both trigger the same hardware powerdown sequence in the ADSP-2171KST-133.