SN74HCT244DWR High-Speed Octal Tri-State Buffer Overview
The SN74HCT244DWR from Texas Instruments is a robust octal (8-channel) tri-state buffer designed for high-speed digital systems requiring reliable signal isolation. Its tri-state outputs??high, low, or high-impedance??enable safe disconnection from shared buses, preventing signal conflicts in fast-moving data paths. This makes it ideal for industrial automation, consumer electronics, and test equipment where 5V compatibility and signal integrity are critical. Fabricante de CI offers this essential logic component as part of its portfolio of high-speed semiconductors, trusted for performance in legacy and modern systems alike.
Technical Parameters of SN74HCT244DWR
| Parámetro | Valor | Unidad |
|---|---|---|
| Número de canales | 8 | canales |
| Rango de tensión de alimentación | 4,5 a 5,5 | V |
| Corriente de salida (máx., por canal) | 25 | mA (sink/source) |
| Retardo de propagación (típico) | 13 | ns (a 5 V, carga de 50 pF) |
| Corriente de reposo (máx.) | 20 | ??A |
| Tipo de envase | SOIC-20 (Small Outline Integrated Circuit, 20-pin) | |
Características de funcionamiento
| Característica | Especificación | |
|---|---|---|
| Temperatura de funcionamiento | De -40 °C a +85 °C | |
| Rango de tensión de entrada | 0 a VCC | |
| Tiempo de activación (típico) | 15 | ns |
| Tiempo de desactivación (típico) | 12 | ns |
| Protección ESD | ??2kV (HBM), ??250V (MM) | |
| Familia lógica | HCT (High-Speed CMOS with TTL compatibility) |
Ventajas sobre los búferes lógicos alternativos
The SN74HCT244DWR stands out in systems requiring 5V compatibility, starting with its 4.5V?C5.5V voltage range??ideal for legacy equipment that can??t be upgraded to low-voltage standards. Unlike LVC-series buffers (1.65V?C3.6V), it integrates seamlessly with 5V microcontrollers and peripherals, eliminating the need for level shifters. “We avoided a full power supply redesign by using this buffer in our industrial control systems,” notes a senior engineer at a leading manufacturing firm.
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Compared to using eight single-channel tri-state buffers, its integrated octal design reduces component count by 87%, slashing PCB space and assembly costs. This integration ensures matched propagation delays across all eight channels, preventing timing skew in coordinated systems??critical for parallel data buses in test equipment.
Its TTL-compatible inputs simplify interfacing with older TTL logic circuits, a feature missing in pure CMOS alternatives. This compatibility is invaluable for retrofitting modern features into legacy machinery, where replacing all components is cost-prohibitive.
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The SOIC-20 package (7.5mm??12.8mm) balances size and functionality, fitting into mid-sized PCBs where larger through-hole packages (e.g., DIP-20) are too bulky. Its 25mA output current also outperforms lower-current buffers, driving signals over longer traces in noise-prone industrial environments.
Typical Applications of SN74HCT244DWR
The SN74HCT244DWR excels in 5V systems requiring multi-channel isolation. Key use cases include:
Contacto
- Industrial automation (legacy PLCs and 5V sensor network bus isolation)
- Consumer electronics (retrofit modules for vintage audio/visual equipment)
- Test and measurement equipment (signal conditioning for 5V data acquisition systems)
- Home appliances (control boards in older 5V-based refrigerators and ovens)
- Automotive electronics (aftermarket 5V accessory interfaces for classic vehicles)
Texas Instruments?? Expertise in Legacy and Modern Logic
As a Texas Instruments product, the SN74HCT244DWR leverages TI??s decades of leadership in both legacy and modern logic design. The HCT series is renowned for TTL compatibility and 5V reliability??critical for supporting existing infrastructure while enabling incremental upgrades. Each unit undergoes rigorous testing to withstand -40??C to +85??C temperatures, ensuring performance in harsh industrial environments. This commitment has made TI a trusted partner for brands like Siemens and Honeywell, who rely on HCT components for consistent performance in long-lived industrial systems.
Preguntas más frecuentes (FAQ)
What is an octal tri-state buffer, and how does it work in 5V systems?
An octal tri-state buffer contains eight independent circuits that amplify signals and can enter a high-impedance state (disconnected) when disabled. In 5V systems, this allows eight signals to share a 5V bus without conflict??only active channels drive the bus, preventing data corruption. This is critical for legacy 5V industrial equipment, where reliable parallel data transfer is essential.
Why is 5V compatibility important for legacy systems?
Many older industrial machines, test equipment, and consumer devices use 5V logic, and replacing them with low-voltage systems is costly. The SN74HCT244DWR??s 4.5V?C5.5V range lets these systems integrate modern features (e.g., new sensors) without redesigning power supplies, extending equipment lifespan and reducing upgrade costs.
How does TTL compatibility benefit system design?
TTL compatibility means the buffer??s inputs work with TTL logic levels (0V?C0.8V for low, 2V?C5V for high), simplifying integration with older TTL circuits. This avoids the need for TTL-to-CMOS level shifters, reducing component count and design complexity??especially valuable when retrofitting legacy systems with modern CMOS-based peripherals.
What makes the SOIC-20 package suitable for mid-sized PCBs?
The SOIC-20 package??s compact footprint (7.5mm??12.8mm) fits in mid-sized PCBs where larger through-hole packages are too bulky, while its surface-mount design enables automated assembly. This makes it ideal for industrial control boards and test equipment, where space is limited but not as constrained as in ultra-compact consumer devices.
Why is 25mA output current important for industrial environments?
25mA output current allows the buffer to drive signals over longer PCB traces (up to 30cm) or multiple loads without degradation??critical in industrial setups where sensors and controllers are spread across machinery. This prevents voltage drops that could corrupt data, ensuring reliable communication in noisy environments with electromagnetic interference.