ST1480ACDR - 3.3V RS-485/RS-422 Transceiver | STMicroelectronics
N.º da peça: ST1480ACDR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.6484 | $0,65 |
ST1480ACDR Visão geral
An RS-485 transceiver is a line driver and receiver pair that enables robust differential data communication over long distances and in noisy environments. It converts TTL/CMOS logic levels to differential signals on a twisted-pair bus, allowing multiple devices to share the same wiring. RS-485 is a physical layer standard defined by the TIA/EIA-485 specification, widely used in industrial automation, building control, and networking. The ST1480ACDR implements this standard with a 3.3V supply, reducing power consumption compared to 5V counterparts while maintaining compatibility with 5V logic through its fail-safe receiver.
Key features of the ST1480ACDR include a wide common-mode input range of -7V to +12V, which enhances noise immunity and allows operation in harsh industrial environments. The device features a 1/8 unit load, allowing up to 256 transceivers on a single bus, and includes thermal shutdown and short-circuit protection for robust operation. Its low quiescent current of 900 uA makes it ideal for power-sensitive applications.
The ST1480ACDR uses a standard RS-485 architecture with a differential driver and receiver, featuring a tri-state output for half-duplex operation. The receiver has a fail-safe design that ensures a high output when the inputs are open, shorted, or terminated, preventing false data. The driver is capable of delivering up to 60 mA of output current, meeting the RS-485 standard's minimum requirement of 1.5V differential output across a 54-ohm load.
Typical applications include industrial control networks, building automation, HVAC systems, and point-of-sale terminals. Its high data rate and robust ESD protection (8 kV HBM) make it suitable for factory automation and process control. The device is also used in security systems and remote sensor networks where reliable long-distance communication is critical.
When designing with the ST1480ACDR, ensure proper termination (120-ohm) at both ends of the bus to minimize reflections. The fail-safe receiver feature eliminates the need for external bias resistors in most applications, simplifying the design. For half-duplex operation, control the driver enable (DE) and receiver enable (RE) pins to avoid bus contention.
Alternativas drop-in para ST1480ACDR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
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ST1480ACDR Especificações
| Tensão de alimentação | 3.3 V |
| Taxa de dados | 12 Mbps |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Duplex | Half |
| Common-Mode Input Range | -7 V to +12 V |
| Unit Load | 1/8 |
| Corrente de repouso | 900 uA |
| Driver Output Current | 60 mA |
| ESD Protection | 8 kV HBM |
| Temperatura de operação | -40C to +85C |
| Encapsulamento | SOIC-8 |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Fail-Safe Receiver | Yes |
Configuração de pinos do ST1480ACDR
| Pino 1 | RO — Receiver output |
| Pino 2 | RE — Receiver enable (active low) |
| Pino 3 | DE — Driver enable (active high) |
| Pino 4 | DI — Driver input |
| Pino 5 | GND — Ground |
| Pino 6 | A — Non-inverting bus line |
| Pino 7 | B — Inverting bus line |
| Pino 8 | VCC — Power supply (3.3V) |
Aplicações típicas
ST1480ACDR é adequado para 6 aplicaçãos: Industrial Automation, Building Automation, Point-of-Sale Terminals, Security Systems, Remote Sensor Networks, Networking Equipment.
Industrial Automation
The ST1480ACDR is ideal for industrial automation networks where reliable, high-speed data communication is required over long distances. Its 12 Mbps data rate and wide common-mode range (-7V to +12V) ensure robust operation in noisy factory environments. The device can be used in PLCs, motor drives, and sensor networks, providing a simple and cost-effective RS-485 interface. Its 1/8 unit load allows up to 256 nodes on a single bus, enabling large-scale automation systems. The fail-safe receiver ensures data integrity even in fault conditions, reducing downtime and maintenance costs.
Recomendado
Building Automation
In building automation systems, the ST1480ACDR provides a reliable communication link for HVAC controllers, lighting systems, and access control panels. Its low quiescent current (900 uA) is beneficial for always-on monitoring applications. The wide common-mode range and ESD protection (8 kV) ensure reliable operation in electrically noisy environments. The device supports data rates up to 12 Mbps, allowing fast updates for real-time control. Its small SOIC-8 package simplifies PCB layout, and the fail-safe receiver eliminates the need for external bias resistors, reducing component count and cost.
Recomendado
Point-of-Sale Terminals
The ST1480ACDR is used in point-of-sale (POS) terminals for communication between the main board and peripherals such as barcode scanners, receipt printers, and cash drawers. Its high data rate (12 Mbps) ensures fast transaction processing, while the 3.3V supply reduces power consumption in battery-backed systems. The device's robust ESD protection (8 kV) is critical in environments where users frequently connect and disconnect cables. The SOIC-8 package allows for compact designs, and the fail-safe receiver prevents data corruption when cables are disconnected.
Recomendado
Security Systems
The ST1480ACDR is well-suited for security systems, including access control panels, CCTV controllers, and alarm systems. Its wide common-mode range and ESD protection ensure reliable communication over long cable runs in outdoor or harsh environments. The device's low quiescent current is ideal for battery-backed security systems. The 1/8 unit load allows many devices to be connected on a single bus, simplifying wiring in large installations. The fail-safe receiver ensures that open or shorted lines do not cause false alarms, enhancing system reliability.
Recomendado
Remote Sensor Networks
The ST1480ACDR is ideal for remote sensor networks where sensors are distributed over large areas and communicate over RS-485 buses. Its low power consumption (900 uA) is crucial for battery-powered sensors. The wide common-mode range allows sensors to operate with different ground potentials, and the high data rate (12 Mbps) supports fast data acquisition. The device's 1/8 unit load enables up to 256 sensors on a single bus, reducing wiring costs. The fail-safe receiver ensures reliable data transmission even when sensor nodes are powered down.
Recomendado
Networking Equipment
The ST1480ACDR is used in networking equipment such as routers, switches, and gateways for management and control communication. Its high data rate (12 Mbps) supports fast configuration and monitoring. The 3.3V supply is compatible with modern networking ICs, and the wide common-mode range ensures reliable operation in data centers with varying ground potentials. The device's ESD protection (8 kV) is essential for equipment that may be handled during installation. The SOIC-8 package is space-efficient, and the fail-safe receiver prevents bus errors during hot-swapping.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ST1480ACDR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ST1480BDR | MAX3485 | ISL83485 | ADM3485 |
|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Brand | STMicroelectronics | STMicroelectronics | Maxim Integrated | Renesas Electronics | Analog Devices |
| Supply Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Data Rate | 12 Mbps | 250 kbps | 10 Mbps | 10 Mbps | 10 Mbps |
| Common-Mode Range | -7V to +12V | -7V to +12V | -7V to +12V | -7V to +12V | -7V to +12V |
| Unit Load | 1/8 | 1/8 | 1/8 | 1/8 | 1/8 |
| Quiescent Current | 900 uA | 900 uA | 400 uA | 500 uA | 400 uA |
| ESD Protection | 8 kV HBM | 8 kV HBM | 2 kV HBM | 2 kV HBM | 2 kV HBM |
Principais diferenciais
- Higher data rate (12 Mbps) compared to MAX3485 (10 Mbps) (vs MAX3485)
- Superior ESD protection (8 kV HBM) vs 2 kV on MAX3485 (vs MAX3485)
- Wider common-mode range (-7V to +12V) vs -7V to +12V on ISL83485 (vs ISL83485)
Notas de projeto
Place the ST1480ACDR close to the bus connector to minimize trace length and reduce EMI. Use a 0.1uF decoupling capacitor between VCC and GND, placed as close to the VCC pin as possible. For longer bus lengths, consider adding a 120-ohm termination resistor at both ends of the bus to prevent signal reflections.
Ensure that the DE and RE pins are not both enabled simultaneously in half-duplex operation, as this can cause bus contention. Use a microcontroller to control these pins with proper timing. Also, avoid exceeding the absolute maximum ratings of -0.3V to +3.9V on the supply voltage and -7V to +12V on the bus pins to prevent damage.
The ST1480ACDR has a maximum junction temperature of 150C. In typical operation, power dissipation is low (less than 100 mW), so thermal issues are unlikely. However, in high-temperature environments, ensure adequate PCB copper area for heat dissipation. The SOIC-8 package has a thermal resistance of approximately 150 C/W.
Informações de conformidade
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified. Halogen-free status not specified in available data.
