Analog Devices Inc. ADSP-2171KS-104

Overview

ADSP-2171KS-104 from Analog Devices is a 32-bit fixed-point DSP microcomputer optimized for real-time digital signal processing in embedded audio, telecom, and industrial control systems. It delivers 33 MIPS at 30 ns instruction cycle time (16.67 MHz crystal, 5.0 V), integrates 2K × 24-bit program RAM, 2K × 16-bit data RAM, dual serial ports with hardware companding, and an 8/16-bit host interface port.

For engineers reviewing the ADSP-2171KS-104 datasheet, ADSP-2171KS-104 pinout, ADSP-2171KS-104 application, or ADSP-2171KS-104 equivalent, key selection criteria include single-cycle instruction execution, zero-overhead looping, bus grant hang logic for multi-processor coexistence, and powerdown mode with <0.55 mW standby consumption.

Technical Context

The ADSP-2171KS-104 implements the ADSP-2100 base architecture with three independent computational units (ALU, MAC, shifter), two dedicated data address generators (DAGs), and a powerful program sequencer enabling zero-overhead loops and conditional execution. It supports simultaneous dual operand fetches-one from on-chip program memory and one from data memory-within a single cycle.

Its dual SPORTs provide synchronous serial I/O with programmable clock generation, frame sync flexibility, 3–16-bit word lengths, and optional A-law/µ-law companding per CCITT G.711. The host interface port (HIP) operates asynchronously and supports 8- or 16-bit configurations for direct connection to Motorola 68000, Intel 80C51, or ADSP-2101 host processors.

Key Specifications

Pinout & Package

The ADSP-2171KS-104 is housed in a 128-lead TQFP (Thin Quad Flat Package) with 0.4 mm lead pitch, thermally enhanced for high-density PCB layouts in signal-processing modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-2171KS-104, the ADSP-2171KS-133 offers higher throughput at the expense of power and layout complexity, while the ADSP-2172KS-104 trades boot flexibility for ROM-based security and reduced external components - both retain identical pinout, software compatibility, and peripheral functionality.

Availability

ADSP-2171KS-104 is available at Aetrix Electronics and suitable for voice communications terminals, digital audio processing modules, and industrial motor control drives requiring stable component supply across extended product lifecycles.

Supply support for ADSP-2171KS-104 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 leader in high-performance analog, mixed-signal, and DSP technology, serving precision instrumentation, industrial automation, and communications markets since 1965.

The ADSP-217x product line was designed specifically for cost-sensitive, low-power embedded DSP applications demanding real-time determinism, integrated peripherals, and software compatibility with the ADSP-2100 family.

FAQ

What is the maximum operating frequency supported by ADSP-2171KS-104?

The ADSP-2171KS-104 operates with a 30 ns instruction cycle time, corresponding to a 33 MIPS throughput. It requires a 16.67 MHz crystal or TTL-compatible clock input at 5.0 V. This timing is fixed by the silicon design and cannot be overclocked; exceeding the specified clock tolerance risks metastability and functional failure. The ADSP-2171KS-104 does not include a PLL multiplier, so the input clock frequency directly determines instruction rate.

Does ADSP-2171KS-104 support external memory expansion?

Yes, ADSP-2171KS-104 supports external memory expansion via dedicated program memory select (PMS), data memory select (DMS), and boot memory select (BMS) signals, along with programmable wait-state generation. It can interface to up to 14K words of external data memory and 16K words of external program memory using its 14-bit address bus and 24-bit data bus. External EPROM booting is supported with automatic seven-wait-state insertion after reset.

How does the powerdown mode of ADSP-2171KS-104 function in practice?

The ADSP-2171KS-104 enters powerdown mode either via the active-low PWD pin or software command, reducing current draw to <0.55 mW. Upon entry, the core clocks halt while registers and memory contents are retained. Recovery occurs within 100 CLKIN cycles; the device resumes execution from the instruction following the powerdown trigger. The PWDACK pin asserts to confirm entry, enabling system-level power sequencing coordination.

Can ADSP-2171KS-104 execute code directly from external memory?

No, ADSP-2171KS-104 requires boot code to be loaded into its on-chip 2K × 24-bit program RAM before execution. It supports automatic booting from byte-wide external EPROM (e.g., 27C256) or initialization via the host interface port (HIP), but lacks external program memory execution capability. Stand-alone ROM execution is not supported - all instructions must reside in internal program memory during runtime.

Is ADSP-2171KS-104 pin-compatible with other ADSP-217x variants?

Yes, ADSP-2171KS-104 is fully pin-compatible with all ADSP-217x family members in the same 128-pin TQFP package, including ADSP-2171KS-133, ADSP-2172KS-104, and ADSP-2173KS-104. Pin functions, power domains, and signal timing are identical across the family; only electrical specifications (voltage, speed grade) and on-chip ROM presence differ. This allows drop-in replacement during prototyping or qualification without PCB revision.