Transceivers allow up to 256 devices on single RS-485 bus.
Press Release Summary:
Offering ESD protection in excess of 15kV, Models SN65HVD33/34/35 and SN65HVD53/54/55 are comprised of differential line drivers and receivers, with separate input and output pins for full-duplex bus communication designs. Units feature slew-rated controlled outputs to avoid unwanted reflections, and accurate data transmission for signaling rates of 1, 5, and 25 Mbps. Power supply options include 3.3 V operation for HVD3x family and 5 V operation for HVD5x family.
Original Press Release:
TI Introduces 3.3-V and 5-V Families of Full-Duplex RS-485 Transceivers
Six Devices Provide Rich Feature Set for Industrial Applications
DALLAS (Nov. 16, 2005) - Texas Instruments Incorporated (TI) [NYSE: TXN] introduced today six full-featured, full-duplex RS-485 transceivers that conserve power, provide optimum AC performance for key operating speeds, and allow up to 256 devices on a single RS-485 bus. (See www.ti.com/sc05244.) With electrostatic discharge (ESD) protection in excess of 15 kV (human body model), these products provide a robust interface for both RS-485 and RS-422 applications such as industrial and building automation, point-of-sale terminals and networks, data terminal equipment/data communications equipment interfaces, and utility meters.
The SN65HVD33/34/35 and SN65HVD53/54/55 are differential line drivers and receivers, with separate input and output pins for full-duplex (4-wire) bus communication designs. The transceivers are designed for interoperation with ANSI TIA/EIA-485A, TIA/EIA-422-B, ITU-T V.11 and ISO 8482:1993 standard-compliant devices.
All the devices provide key features and options to give designers the flexibility to maximize their system performance, such as slew rate-controlled outputs to avoid unwanted reflections, and higher-accuracy data transmission for signaling rates of 1, 5 and 25 Mbps. The families also provide a 1/8-unit load option, which allows for up to 256 nodes on the bus. Power supply options include 3.3-V operation for the HVD3x family and 5-V operation for the HVD5x family. When in the low-current standby mode, the HVD3x supply current typically drops to 22 nA, making these devices ideal for power-sensitive applications. The HVD5x family provides strong bus drivers with differential output voltages well above the RS-485/RS-422 requirements. This provides signal margin for applications with interconnection losses or noise immunity concerns.
The HVD3x/5x devices are among TI's diverse offering of integrated circuits for industrial applications, including the TMS320C2000TM digital signal controllers and MSP430 ultra-low power microcontrollers, as well as a range of precision amplifiers, data converters and power management products.
Key Features
o 3.3-V operation for HVD3x family; 5-V operation for HVD5x family
o 1/8th Unit-Load Option Available (up to 256 nodes on the bus)
o Bus-Pin ESD Protection 15 kV HBM
o Optimized Driver Output Transition Times for Signaling Rates of 1, 5, and 25 Mbps
o Low Current Standby Mode: less than 1uA
o Power-Up/Down Glitch-free Bus I/Os
o Bus Idle, Open and Short Circuit Failsafe
o Operation from -40C to +85C
Available Today
The SN65HVD3x/5x devices are available now from TI and its authorized distributors. The devices are packaged in a 14-pin small-outline integrated circuit (SOIC) package and are priced at $1.85 for the HVD3x devices and $1.75 for the HVD5x devices in 1,000-unit quantities. Please see the table below for each device's power supply, signaling rate, unit load and price.
Part Number Power Supply Signaling Rate Unit Loads Price (1ku)
SN65HVD33D 3.3 V 25 Mbps 1/2 $1.85
SN65HVD34D 3.3 V 5 Mbps 1/8 $1.85
SN65HVD35D 3.3 V 1 Mbps 1/8 $1.85
SN65HVD53D 5 V 25 Mbps 1/2 $1.75
SN65HVD54D 5 V 5 Mbps 1/8 $1.75
SN65HVD55D 5 V 1 Mbps 1/8 $1.75
TI will introduce other additions to the HVD3x/5x families in 2006, including products that implement receiver equalization technology for improved performance in long distance applications.
About Texas Instruments
Texas Instruments Incorporated provides innovative DSP and analog technologies to meet our customers' real world signal processing requirements. In addition to Semiconductor, the company's businesses include Sensors & Controls, and Educational & Productivity Solutions. TI is headquartered in Dallas, Texas, and has manufacturing, design or sales operations in more than 25 countries.
Texas Instruments is traded on the New York Stock Exchange under the symbol TXN. More information is located on the World Wide Web at www.ti.com
Trademarks
TMS320C2000 is a trademark of Texas Instruments. All registered trademarks and other trademarks belong to their respective owners.
