Analog Devices Inc. ADSP-2171KST-104

Overview

ADSP-2171KST-104 from Analog Devices is a 5.0 V, 30 ns instruction-cycle (33 MIPS) 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 Bus Grant Hang Logic. It executes single-cycle instructions while concurrently handling serial I/O, timer decrement, and host transfers - deployed in real-time audio codecs and telecom line cards.

For engineers reviewing the ADSP-2171KST-104 datasheet, ADSP-2171KST-104 pinout, ADSP-2171KST-104 application, or ADSP-2171KST-104 equivalent, key selection criteria include 128-pin TQFP package compatibility, 30 ns timing at 5.0 V, dual SPORTs with hardware companding, HIP configurability for 8/16-bit hosts, and powerdown mode with <0.55 mW standby consumption.

Technical Context

The ADSP-2171KST-104 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.

It supports simultaneous dual-operand fetches via dedicated PMA/PMD and DMA/DMD buses, booting from byte-wide EPROM or via HIP, and asynchronous host communication with programmable wait states. The 128-pin TQFP package exposes full external memory bus, dual SPORTs, HIP control pins, and three edge/level-sensitive IRQ inputs.

Key Specifications

Pinout & Package

ADSP-2171KST-104 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 mechanically 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 fixed-point DSP microcomputer applications.

Compared with ADSP-2171KST-104, ADSP-2171KSTZ-104 offers identical functionality in an environmentally compliant package, while TMS320C549PGE delivers higher raw throughput but demands complete firmware rewrite and external codec integration - making ADSP-2171KST-104 optimal for cost-sensitive, low-power voice and control applications where hardware acceleration features are critical.

Availability

ADSP-2171KST-104 is available at Aetrix Electronics and suitable for voice codec subsystems, telecom line cards, industrial motor controllers, and medical ultrasound beamformers requiring stable component supply across extended product lifecycles.

Supply support for ADSP-2171KST-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, 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 specifically for real-time embedded DSP applications demanding low-latency I/O, deterministic execution, and integrated peripherals - targeting voice, telecom, and industrial control markets in the mid-1990s.

FAQ

What is the maximum external memory capacity supported by ADSP-2171KST-104?

ADSP-2171KST-104 supports up to 16K words of external program memory and 14K words of external data memory using its 14-bit address bus and programmable wait-state generation. The processor's external bus interface allows connection to EPROM, SRAM, or memory-mapped peripherals with configurable timing to match device access speeds.

Does ADSP-2171KST-104 support crystal or external clock input?

Yes, ADSP-2171KST-104 accepts either a parallel-resonant fundamental-mode crystal across CLKIN/XTAL pins or a TTL-compatible external clock signal applied to CLKIN. When using an external clock, XTAL must be left unconnected, and the input frequency must equal half the desired instruction rate (e.g., 16.67 MHz for 30 ns cycle time).

Can ADSP-2171KST-104 boot from the Host Interface Port (HIP)?

Yes, ADSP-2171KST-104 can boot from the HIP when BMODE = 1 and MMAP = 0. In this configuration, the host processor writes initialization code and data directly into on-chip program RAM through the HIP before releasing RESET, enabling flexible system-level firmware updates without external EPROM.

What is the function of the Bus Grant Hang Logic (BGH) in ADSP-2171KST-104?

The Bus Grant Hang Logic (BGH) in ADSP-2171KST-104 prevents bus contention during external DMA operations by holding the BG signal active until the external bus master deasserts BR. This ensures deterministic handoff between the DSP and host processor, eliminating race conditions that could corrupt memory transfers.

How does the powerdown mode of ADSP-2171KST-104 recover execution?

ADSP-2171KST-104 recovers from powerdown mode in as few as 100 CLKIN cycles. Upon wake-up (via IRQ, RESET, or PWD deassertion), the core resumes execution from the instruction following the powerdown entry point, with all registers and memory contents preserved unless context-clear mode is enabled.