Texas Instruments SM320C50PQM66EP

Overview

SM320C50PQM66EP from Texas Instruments is a radiation-tolerant, military-grade 16-bit fixed-point digital signal processor (DSP) with 66 MHz clock speed (30 ns instruction cycle), 9K × 16-bit on-chip program/data RAM, and IEEE 1149.1 boundary scan support. It operates across −55°C to 125°C and targets satellite telemetry, missile guidance, and hardened avionics control systems.

For engineers reviewing the SM320C50PQM66EP datasheet, SM320C50PQM66EP pinout, SM320C50PQM66EP application, or SM320C50PQM66EP equivalent, key selection considerations include its extended-temperature operation, static CMOS architecture enabling ultra-low-power IDLE2 mode (7 µA), dual serial ports (TDM + synchronous), and 132-pin PQFP package with full memory bus interface for real-time signal processing in mission-critical embedded environments.

Technical Context

The SM320C50PQM66EP implements a four-deep instruction pipeline with delayed branching and subroutine call/return, delivering ≥2× performance over prior TMS320C2x devices. Its 32-bit ALU includes dual accumulators (ACC/ACCB), while the dedicated 16-bit PLU enables bit manipulation without ALU involvement.

It supports three clock modes via CLKMD1/CLKMD2: external divide-by-one (via CLKIN2), external divide-by-two (via X2/CLKIN), or internal oscillator with crystal (X1/X2). Memory mapping includes 64K program, 64K data, 64K I/O, and 32K global address spaces, with 16 software-programmable wait-state generators for flexible external memory interfacing.

Key Specifications

Pinout & Package

SM320C50PQM66EP uses a 132-lead plastic quad flat package (PQFP) with 0.65 mm lead pitch, designed for high-reliability board assembly and thermal management in conduction-cooled enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SM320C50PQM66EP, the SM320C6701GJC150 offers superior floating-point capability at the expense of power and qualification scope, while the TMS320C5517PTPA delivers higher clock speed and lower active power but forfeits military temperature range and radiation-hardened pedigree.

Availability

SM320C50PQM66EP is available at Aetrix Electronics and suitable for satellite telemetry, missile guidance, avionics health monitoring, and radiation-hardened test equipment requiring stable component supply across extended lifecycle programs.

Supply support for SM320C50PQM66EP 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

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability components for aerospace, defense, and industrial markets.

The SM320C50PQM66EP belongs to TI's military-enhanced TMS320C50 DSP family, engineered specifically for deterministic real-time signal processing in radiation-exposed, thermally extreme environments where failure is not an option.

FAQ

What is the maximum external memory space supported by the SM320C50PQM66EP?

The SM320C50PQM66EP supports up to 224K × 16-bit external memory space, divided into 64K program, 64K data, 64K I/O, and 32K global address spaces. This architecture enables flexible memory partitioning for real-time DSP tasks while maintaining Harvard-style separation between instruction and data paths. The SM320C50PQM66EP uses 16 address lines (A0–A15) and 16 data lines (D0–D15) to interface with external memory controllers or peripherals.

Does the SM320C50PQM66EP support IEEE 1149.1 boundary scan, and how is it implemented?

Yes, the SM320C50PQM66EP integrates full IEEE 1149.1 boundary scan logic with dedicated TCK, TMS, TDI, TDO, and TRST pins. It supports standard JTAG instructions including SAMPLE/PRELOAD, EXTEST, INTEST, and BYPASS. During emulation, the EMU1/OFF pin configures the device into boundary scan mode, placing all outputs in high-impedance state for safe interconnect testing. The SM320C50PQM66EP's boundary scan chain covers all primary I/O pins and internal registers, enabling production test and in-system debug without physical probe access.

What clock configuration options does the SM320C50PQM66EP offer, and how are they selected?

The SM320C50PQM66EP supports three clock modes selected via CLKMD1 and CLKMD2 pins: external divide-by-one (CLKIN2 input), external divide-by-two (X2/CLKIN input), or internal oscillator with crystal (X1/X2). In divide-by-one mode, CLKIN2 accepts a 66 MHz signal directly; in divide-by-two mode, X2/CLKIN accepts 132 MHz to generate 66 MHz internally. The internal oscillator requires a 20 pF-load fundamental crystal. The SM320C50PQM66EP's fully static design permits operation down to DC, making it suitable for ultra-low-power applications using IDLE2 mode.

How does the IDLE2 instruction reduce power consumption in the SM320C50PQM66EP?

The IDLE2 instruction halts the functional clock to all internal hardware blocks except the JTAG controller and reset circuitry, reducing supply current to just 7 µA at 125°C and 5.25 V. This total-sleep mode is exited by any asserted external interrupt (INT1–INT4, NMI) with ≥5 clock-cycle duration. Unlike standard IDLE, IDLE2 eliminates dynamic switching power entirely - critical for battery-operated satellite subsystems requiring multi-year standby. The SM320C50PQM66EP maintains register context and memory contents during IDLE2, enabling immediate resumption of real-time processing upon wake-up.

What is the role of the Parallel Logic Unit (PLU) in the SM320C50PQM66EP architecture?

The PLU in the SM320C50PQM66EP is a dedicated 16-bit logic unit that performs bitwise AND, OR, XOR, and NOT operations on data memory locations without consuming ALU cycles or accumulator resources. It operates in parallel with the main CPU pipeline, enabling efficient bit-field extraction, status register manipulation, and protocol header parsing - tasks common in telemetry framing and communication stack implementation. Because the PLU accesses data memory independently, it avoids contention with arithmetic operations, preserving the SM320C50PQM66EP's deterministic execution timing for time-critical control loops.