Linear Technology Introduces High Voltage Tolerance RS485/RS422 Transceiver Series LTC2862-2865
TFT LCD screens are characterized by good development, high screen, strong sense of layering, and bright colors, but there are also relatively power consumption and low cost. TFT screen technology legendary the development of mobile phone color screens. Many of them support 65536 color displays, and even have 160,000 color displays. With a very high screen TFT, the visual advantage is important. Tft Lcd Display,The Lcd Display,9.7 Inch Industrial Lcd Display,Lvds Tft Display ESEN Optoelectronics Technology Co., Ltd, , https://www.esenlcd.com
Linear Technology Corporation (Linear Technology CorporatiON) introduced the LTC2862-2865, an extremely robust, high-voltage-tolerance RS485/RS422 transceiver family that protects against field failures without the need for expensive external protection devices. In an actual RS485 system, installation of cross-line faults, ground faults, or lighting-induced surge voltages may cause overvoltage conditions that exceed the absolute maximum ratings of a typical transceiver. The LTC2862-2865 has ±60V overvoltage fault protection on the data transmission line, which protects the bus pins during operation and power shutdown. Whether the circuit is transmitting, receiving, in standby, or powered off, the LTC2862-2865 can tolerate voltages within ±60V without damage, thereby enhancing the ruggedness of any typical RS485 network. This low power family supports fast 20Mbps and low EMI conversion rate limited 250kbps data rates for half-duplex and full-duplex versions.
The LTC2862-2865 family provides useful protection and reliability for a variety of RS485/RS422 applications, including industrial control, instrumentation networks, and automotive electronics. The extended ±25V input common-mode range and thorough fail-safe operation improve the reliability of data communications in environments with electrical noise and in the presence of ground loop voltage. This extended common-mode range allows the LTC2862-2865 family to send and receive under harsh conditions that would otherwise cause data errors and possible device damage. Enhanced ESD protection allows these devices to withstand ±15kV (HBM and IEC-100-4-2 air discharge) at the transceiver pins without latchup or damage. All other pins are protected to ±8kV HBM. Fully symmetrical receiver thresholds allow these devices to maintain good duty cycle symmetry at low signal levels and improve the receiver's noise immunity.
The LTC2862-2865 family is available in commercial, industrial and automotive temperature grades and is available in DFN and SO packages with industry standard pinouts. The 20-Mbps half-duplex version is priced at $2.35 per piece in 1,000-piece quantities. These devices provide a pin-compatible upgrade path for Linear Technology's half-duplex LT1785 and full-duplex LT1791 (250kbps ±60V fault-protected transceivers).
Photo Caption: ±60V Fault-Protected RS485 Transceiver Performance with ±25V Common Mode Range: LTC2862-2865
Overvoltage line fault protection up to ±60V
• 3V to 5.5V Supply Voltage • 20Mbps or Low EMI 250kbps Data Rate • ±15kV ESD Interface Pin, All Other Pins ±8kV
Extended common-mode range: ±25V
· Ensure fail-safe receiver operation · Supports up to 256 nodes · Separate 1.65V to 5.5V logic supply pins (LTC2865)
Temperature range: -40°C to 125°C
·Industry standard pinout
Technical characteristics
TFT technology was developed in the 1990s. It uses new materials and new processes for fine semiconductor all-electronic manufacturing technology. It is the basis of liquid crystal (LC), inorganic and organic thin-film electroluminescence (EL and OEL) flat panel displays. It is a variety of films made on non-single materials such as glass or plastic products (of course also on the surface) through methods and chemical reaction forming processes, and a large number of micro-integrated circuits (LSIC) are produced through the processing of the films. Non-single crystal crystals can achieve cost reduction, which is an extension of traditional small integration to large area, function, and direction. Manufacturing TFTs that control the switching performance of pixels (LC or OLED) on large glass or plastic products has a higher technical content than manufacturing complete ICs on silicon wafers. The required production equipment and production technology surpass the production of large-scale integration of semiconductors, which is the luster of modern technology. The main features are:
(1) Large area: The first generation of large-area glass products (300mm×400mm) TFT-LCD-production line was put into production at the beginning of the nineties, and the area of eye glass has been expanded to 60mm×80mm in 2000), as well as 950mm×1200mm glass The design will also run.
(2) High integration: The size of the 1.3-inch TFT chip used for the projection of liquid crystal is one million for GA. The resolution is SXGA (1280×100×1280×1000×1280×1000×1280×1000×16.1 inch TFT screen amorphous film) 50nm, and TAB ON GLASS and SYSTEM ON GLASS technology, its IC integration, The technical requirements for equipment and supplier technology are more difficult than traditional LSI.
(3) Powerful function: TFT as a matrix selection solution provides the light valve characteristics of liquid crystal. TFT-LCD is the first Liquid Crystal Display in human history whose display quality exceeds that of CRT. The function will be more powerful, which is unmatched by traditional small integrated circuits.
(4) Design: Glass products and plastic products have fundamentally solved the problem of large semiconductors and opened up potential applications for the application of small semiconductors.
(5) Ingenious process: In addition to the use of vapor phase, chemical vapor deposition (chemical vapor deposition) MCVD (molecular chemical vapor deposition) and other processes to form films, laser flame technology has also begun to be applied traditionally, not only making amorphous films, polycrystalline films, but also Single crystal films can be manufactured. Can make silicon film, can also make other II-VI group and III-V group semiconductor thin film.
(6) Wide range of application fields. Liquid crystal display based on TFT technology is a rich industry in the information society, and the technology can also be applied to the rapid growth of thin-film organic electroluminescence (TFT-OLED) flat panel Display Screen shots. .