Texas Instruments SM320LC31PQM40EP

Overview

SM320LC31PQM40EP from Texas Instruments is a radiation-tolerant, military-grade 32-bit floating-point digital signal processor (DSP) operating at 40 MHz with 50-ns instruction cycle time, delivering 220 MOPS and 40 MFLOPS. It integrates dual 1K×32-bit on-chip RAM blocks, 64-word instruction cache, two 32-bit timers, one DMA channel, and a serial port supporting 8-/16-/24-/32-bit transfers - deployed in radar signal processing and onboard telemetry systems.

For engineers reviewing the SM320LC31PQM40EP datasheet, SM320LC31PQM40EP pinout, SM320LC31PQM40EP application, or SM320LC31PQM40EP equivalent, key selection criteria include its −55°C to 125°C operating range, 3.3-V EPIC™ CMOS process, 132-pin PQ package, parallel ALU/multiplier execution, and boot-program loader for cold-temperature power-up robustness.

Technical Context

The SM320LC31PQM40EP implements a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and operand access. Its CPU features eight extended-precision registers, two auxiliary register arithmetic units (ARAUs), and hardware-accelerated zero-overhead loops with single-cycle branches.

It supports multiprocessing via interlocked instructions and configurable wait-state generation through bus-control registers. The device uses TTL-compatible I/O with internal pullups on INT0–INT3 and MCBL/MP, and operates with external clock input (X2/CLKIN) driving H1/H3 outputs at twice the CLKIN frequency.

Key Specifications

Pinout & Package

The SM320LC31PQM40EP is housed in a 132-pin plastic quad flatpack (PQ) package with 0.65 mm lead pitch and 20 mm × 20 mm body size. Power and ground pins are distributed across all four sides for low-noise decoupling: 20× VDD (3.3 V), 25× VSS (ground), plus dedicated analog/digital supply planes (AVDD, DVDD, CVDD, PVDD) and isolated ground types (CVSS, VSSL, IVSS).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital signal processor applications.

Compared with SMJ320C31GBH and TMS320C6713BZDHA, the SM320LC31PQM40EP uniquely combines radiation-hardened packaging, −55°C to 125°C operation, and EPIC™-optimized 40-MFLOPS throughput - making it irreplaceable in mission-critical aerospace platforms where lifecycle assurance and environmental resilience are non-negotiable.

Availability

SM320LC31PQM40EP is available at Aetrix Electronics and suitable for radar signal processing, onboard telemetry systems, military communications, and avionics flight control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SM320LC31PQM40EP 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 global semiconductor leader specializing in analog, embedded processing, and high-reliability components for aerospace, defense, and industrial markets.

The SM320LC31PQM40EP belongs to TI's SM320C3x military DSP family, designed specifically for deterministic real-time signal processing in radiation-prone, thermally extreme environments such as missile guidance, satellite payloads, and fighter jet avionics.

FAQ

What is the operating voltage and temperature range for the SM320LC31PQM40EP?

The SM320LC31PQM40EP operates at 3.3 V ±0.17 V (3.13 V to 3.47 V) and is qualified for −55°C to 125°C case temperature per MIL-PRF-38535 Enhanced Product standards. Its 20× VDD and 25× VSS pins require proper decoupling with 0.1-µF capacitors per supply pin to maintain stability across the full range. This makes the SM320LC31PQM40EP suitable for deployment in stratospheric UAVs and orbital satellites.

Does the SM320LC31PQM40EP support in-circuit emulation?

Yes, the SM320LC31PQM40EP provides four dedicated emulation pins: EMU0–EMU3. EMU0–EMU2 are input-only reserved pins requiring 18-kΩ–22-kΩ pullup resistors to VDD; EMU3 is bidirectional. These pins enable real-time debugging and trace via TI's XDS510-class emulators, supporting breakpoint insertion, register inspection, and memory read/write during active execution of the SM320LC31PQM40EP.

How does the SM320LC31PQM40EP handle external memory interfacing?

The SM320LC31PQM40EP uses a multiplexed 32-bit data bus (D31–D0) and 24-bit address bus (A23–A0) with STRB, R/W, and RDY control signals. Bus timing is synchronized to H1/H3 clocks derived from X2/CLKIN. Wait states are programmable via primary-bus-control registers - allowing adaptation to SRAM, Flash, or FIFO devices with access times up to 100 ns. This configuration is fully implemented in the SM320LC31PQM40EP's hardware logic.

What clock sources can drive the SM320LC31PQM40EP?

The SM320LC31PQM40EP accepts an external clock via the X2/CLKIN pin (CMOS- or TTL-compatible) or a crystal between X1 and X2. Internal oscillation generates H1 and H3 outputs at exactly twice the CLKIN frequency. The device requires no external PLL; clock distribution is handled on-die. For cold-temperature operation below −40°C, TI recommends verifying startup behavior per application report SGUA001 - a requirement explicitly addressed in the SM320LC31PQM40EP's qualification.

Is the SM320LC31PQM40EP pin-compatible with other C3x-series DSPs?

No, the SM320LC31PQM40EP is not pin-compatible with standard C3x devices like TMS320C31 or TMS320LC31 due to differences in power pin count (20× VDD vs. 12×), ground distribution (25× VSS), and dedicated EPIC™-specific signal routing. Its 132-pin PQ footprint matches only the SM320LC31-EP and SM320C31-EP variants. Migration requires PCB redesign - confirmed by TI's SGUS039 datasheet pinout tables and package mechanical drawings.