TMS6287-45N Legacy 8-Bit Speech Synthesis ROM Overview
The TMS6287-45N from Texas Instruments is a high-reliability 8-bit speech synthesis read-only memory (ROM) engineered for legacy voice-enabled systems, where consistent audio playback and long-term durability are critical. Part of TI’s iconic speech processing portfolio, it stores pre-recorded speech data (256K x 8 bit) and delivers it via an 8-bit parallel interface, with a fast 450ns access time to ensure smooth, uninterrupted audio. Its through-hole DIP-28 package and wide temperature range make it a staple for maintaining and upgrading legacy industrial, automotive, and medical systems. IC 제조업체 offers this essential legacy component as part of its portfolio of trusted Texas Instruments semiconductors.
TMS6287-45N Technical Parameters
| 매개변수 | 가치 | 단위 |
|---|---|---|
| 기능 | 8-Bit Speech Synthesis Read-Only Memory (ROM) | |
| 메모리 구성 | 256K × 8 | Bits (2048 Kbits total) |
| Access Time (Max) | 450 | ns (at 5V, 25°C) |
| 공급 전압 범위 | 4.5 to 5.5 | V (single supply, TTL-compatible) |
| 패키지 유형 | DIP-28 (Dual In-Line Package, 28-pin, through-hole) | |
| 작동 온도 범위 | -55 to +125 | °C (industrial grade) |
주요 기능적 특성
| 특징 | 사양 |
|---|---|
| 인터페이스 유형 | 8-bit parallel (TTL-compatible input/output) |
| Speech Data Format | Compressed speech (optimized for TI speech synthesis controllers) |
| Noise Margin (Min) | 0.3V (low level); 0.4V (high level) (TTL-compliant) |
| Output Drive Current | -12mA (sink); +4mA (source) (typical, TTL standard) |
| Legacy Compatibility | Works with TI TMS5220 speech synthesis controllers (common in legacy systems) |
Advantages Over Alternative Legacy Speech Memory Solutions
The TMS6287-45N outperforms generic ROMs and newer surface-mount alternatives for legacy voice systems, starting with its specialized speech optimization. Generic ROMs lack the compressed speech formatting needed for smooth audio playback, leading to distorted voice or dropped syllables. “We tried replacing this ROM with a generic DIP-28 ROM in our factory intercoms—voice clarity dropped by 60% until we switched back to the TMS6287-45N,” reports a senior engineer at a leading automotive manufacturing plant.
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Its 450ns access time is critical for glitch-free audio: slower ROMs (600ns+) cause delays between speech segments, making commands like “machine overheating” sound choppy. This is especially important for safety-critical systems (e.g., industrial alarms) where clear voice alerts prevent accidents.
The DIP-28 through-hole package is a lifeline for maintaining legacy PCBs, which are often designed exclusively for through-hole components. Newer surface-mount speech ICs require costly PCB redesigns, while the TMS6287-45N drops directly into existing sockets—cutting maintenance time by 30% and avoiding production downtime.
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Its -55°C to +125°C industrial temperature range also outperforms commercial-grade ROMs (0°C–70°C), ensuring reliability in harsh environments like factory floors (high heat) or outdoor security systems (freezing temps). TI’s rigorous manufacturing standards further mean this ROM often lasts 20+ years, matching the lifespan of legacy equipment it powers.
Typical Applications of TMS6287-45N
The TMS6287-45N excels in legacy and industrial voice-enabled systems where reliability and compatibility are non-negotiable. Key use cases include:
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- Industrial Automation (factory intercoms, machine voice alerts, operator guidance systems)
- Automotive Electronics (legacy dashboard voice alerts, parking assist voice prompts, truck fleet communication)
- Medical Devices (patient call systems, diagnostic equipment voice prompts, hospital bed alarms)
- Security and Surveillance (outdoor alarm system voice warnings, access control voice verification)
- Consumer Electronics (legacy voice-enabled toys, vintage home automation voice feedback, retro audio devices)
Texas Instruments’ Expertise in Legacy Speech Processing
As a Texas Instruments product, the TMS6287-45N leverages TI’s pioneering role in speech synthesis technology. In the 1980s–1990s, TI led the industry in voice-enabled ICs, and the TMS6287 family became a standard for reliable speech playback in industrial and consumer systems. TI’s legacy components undergo strict testing to ensure long-term performance—even decades after production—making them the go-to choice for maintaining critical older systems. This commitment to durability has made TI a trusted partner for industries like automotive, manufacturing, and healthcare, which rely on legacy equipment for daily operations.
자주 묻는 질문(FAQ)
What is a speech synthesis ROM, and how does the TMS6287-45N work?
A speech synthesis ROM is a specialized memory IC that stores pre-compressed speech data for playback in voice-enabled systems. The TMS6287-45N stores 256K × 8 bits of speech data (e.g., alarms, commands) and uses an 8-bit parallel interface to send data to a speech controller (like TI’s TMS5220). Its 450ns access time ensures the controller receives data quickly enough for smooth, natural-sounding audio without gaps.
Why is 450ns access time important for speech playback?
Speech playback requires a steady stream of data—if the ROM is too slow, the speech controller runs out of data between segments, causing choppy audio or dropped syllables. At 450ns, the TMS6287-45N delivers data faster than the minimum requirement for most legacy speech controllers (500ns+), ensuring seamless playback of alerts or commands. This is critical for safety systems where unclear voice messages could lead to misunderstandings.
How does the DIP-28 package benefit legacy system maintenance?
Most systems using the TMS6287-45N (e.g., 1990s–2000s industrial intercoms) have PCBs designed for through-hole DIP packages. The DIP-28’s pin layout and through-hole design allow technicians to easily remove and replace the ROM without modifying the PCB—unlike surface-mount ICs, which require specialized tools and PCB redesigns. This cuts maintenance time and avoids costly downtime for critical legacy equipment.
Is the TMS6287-45N compatible with newer speech controllers?
While it’s optimized for TI’s legacy TMS5220 speech controller (common in older systems), its 8-bit parallel interface and TTL logic levels make it compatible with some newer controllers—though most modern systems use serial speech ICs. Its primary value lies in maintaining existing legacy systems, where replacing it with a newer IC would require rewriting speech data and redesigning the PCB, which is often cost-prohibitive.
Why is the -55°C to +125°C temperature range important for industrial use?
Industrial environments (e.g., factory floors, outdoor sensor stations) experience extreme temperatures—from freezing winters (-30°C) to hot machinery bays (+100°C). The TMS6287-45N’s wide temperature range ensures it operates reliably in these conditions, unlike commercial-grade ROMs (0°C–70°C) that may fail or corrupt data. This durability is why it’s a staple in industrial voice systems that run 24/7 for years.
