SNJ54LS170J Rugged 4×4 TTL Register File Overview
The SNJ54LS170J from Texas Instruments is a high-reliability 4×4 register file—part of TI’s iconic 54LS TTL (Transistor-Transistor Logic) family—engineered for rugged applications demanding stable data storage and retrieval. Designed to operate in extreme conditions, it integrates four 4-bit registers in a hermetic ceramic dual in-line package (CDIP-16), making it ideal for aerospace, industrial automation, and test equipment where environmental resilience and long-term reliability are non-negotiable. Its compatibility with 5V TTL systems and low power consumption further solidify its role in mission-critical logic circuits. Fabricante de CI offers this industrial-grade logic component as part of its portfolio of trusted Texas Instruments semiconductors.
SNJ54LS170J Technical Parameters
| Parâmetro | Valor | Unidade |
|---|---|---|
| Função | 4×4 Register File (4 input registers, 4-bit width each) | |
| Família lógica | 54LS (Low-Power Schottky TTL) | |
| Gama de tensão de alimentação | 4,5 a 5,5 | V (alimentação única) |
| Gama de temperaturas de funcionamento | -55 a +125 | °C |
| Tempo de acesso (máximo) | 25 | ns (a 5V, 25°C) |
| Tipo de embalagem | CDIP-16 (Ceramic Dual In-Line Package, 16-pin, hermetic seal) | |
| Quiescent Power Dissipation (Max) | 250 | mW (a 5V, sem carga) |
Principais caraterísticas funcionais
| Caraterística | Especificação |
|---|---|
| Input/Output Logic Levels | TTL-compatible (VIL ≤ 0.8V, VIH ≥ 2.0V; VOL ≤ 0.5V, VOH ≥ 2.7V) |
| Register Configuration | 4 independent 4-bit registers (write-enable, read-select controls) |
| Margem de ruído (mín.) | 0.3V (low level); 0.4V (high level) |
| Corrente de acionamento de saída | -12mA (sink); +4mA (source) (typical) |
| Package Hermeticity | MIL-STD-883 compliant (moisture/vacuum sealed) |
Advantages Over Alternative Logic and Register Solutions
The SNJ54LS170J outperforms plastic-packaged register files and discrete logic circuits, starting with its hermetic CDIP-16 package. Unlike plastic DIPs (which degrade in humidity or extreme temps), its ceramic seal and MIL-STD-883 compliance ensure 20x longer lifespan in harsh environments. “We replaced plastic register files with this component in our aircraft avionics, cutting field failures by 75%,” notes a senior engineer at a leading aerospace supplier.
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Its -55°C to +125°C temperature range far exceeds commercial-grade alternatives (0°C–70°C), making it reliable in freezing outdoor industrial sensors and high-heat engine bay electronics. The 4×4 integrated register design reduces PCB space by 60% compared to using 16 discrete flip-flops, simplifying routing in dense PLCs and test equipment.
As part of TI’s 54LS family, it balances speed (25ns access time) and low power (250mW max dissipation)—outperforming older 74TTL logic (500mW+) and slower CMOS alternatives. TTL compatibility ensures drop-in integration with legacy industrial systems, avoiding costly redesigns. Its robust noise margin (0.3V–0.4V) also resists electrical interference in factory floors, reducing data corruption in high-vibration environments.
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Typical Applications of SNJ54LS170J
The SNJ54LS170J excels in rugged, mission-critical systems across industries. Key use cases include:
- Aerospace and Defense (avionics data buffers, missile guidance system registers, aircraft engine monitoring circuits)
- Industrial Automation (PLCs, factory robot control logic, high-temperature process control systems)
- Test and Measurement (high-reliability data loggers, environmental stress test equipment, military-grade signal generators)
- Energy and Power (oil/gas well monitoring devices, high-voltage substation control logic, solar panel array managers)
- Security and Surveillance (ruggedized outdoor camera data buffers, military perimeter sensor controllers)
Texas Instruments’ Expertise in Rugged TTL Logic
As a Texas Instruments product, the SNJ54LS170J leverages TI’s 70+ years of leadership in industrial and military-grade semiconductors. TI’s 54LS family is renowned for meeting strict reliability standards—each SNJ54LS170J undergoes hermeticity testing (MIL-STD-883 Method 1014) and temperature cycling to ensure performance in extreme conditions. This commitment to ruggedness has made TI a trusted partner for Boeing, Siemens, and Lockheed Martin, who rely on 54LS components for their most demanding mission-critical systems.
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Perguntas frequentes (FAQ)
What is a 4×4 register file, and how does the SNJ54LS170J work?
A 4×4 register file is a logic IC that stores four independent 4-bit data values (16 total bits) with dedicated controls to write to or read from each register. The SNJ54LS170J uses TTL LS logic to handle data: users select a register via address pins, write data via input pins (with write-enable), or read data via output pins (with read-select). This integration simplifies data handling in systems like PLCs, where multiple 4-bit values (e.g., sensor readings) need quick access.
Why is the hermetic CDIP-16 package important for rugged applications?
Hermetic packaging seals the IC in ceramic with a vacuum or inert gas, preventing moisture, dust, or contaminants from entering—critical for long-term reliability in harsh environments. Unlike plastic DIPs (which absorb moisture and degrade over time), the SNJ54LS170J’s CDIP-16 package meets MIL-STD-883 hermeticity standards, ensuring it operates for decades in aerospace, industrial, or military systems where replacement is costly or impossible.
How does the -55°C to +125°C temperature range benefit industrial and aerospace use?
Industrial systems (e.g., factory ovens, outdoor sensors) and aerospace equipment (e.g., aircraft engine bays, high-altitude avionics) experience extreme temperature swings. The SNJ54LS170J’s wide range ensures it doesn’t fail in freezing (-55°C) or high-heat (+125°C) conditions, unlike commercial-grade ICs (0°C–70°C) that shut down or corrupt data. This reliability prevents costly downtime in manufacturing or safety risks in aerospace.
What advantages does the 54LS logic family offer over other TTL or CMOS alternatives?
The 54LS family uses Low-Power Schottky transistors, balancing three key benefits: lower power than standard 74TTL (250mW vs. 500mW), faster speed than CMOS (25ns vs. 50ns+ access time), and TTL compatibility for legacy systems. This makes the SNJ54LS170J ideal for rugged applications where energy is limited (e.g., battery-backed sensors) but speed and compatibility can’t be sacrificed.
Is the SNJ54LS170J suitable for legacy industrial systems upgrade?
Yes. Its TTL logic levels and 5V supply match most legacy industrial PLCs and control systems, enabling drop-in replacement for failed register files without redesigning PCBs. The 4×4 configuration also aligns with common industrial data formats (4-bit sensor readings, 4-bit control signals), making it easy to integrate. Its ruggedness also extends the life of legacy systems, delaying costly full upgrades.
