ST3485ECN

ST3485E 3.3V Powered, 15KV ESD protected, Up to 12Mbps RS-485/RS-422 transceiver General features ■ ESD protection – ±15kV human body model – ±8kV IEC 1000-4-2 contact discharge ■ Operate from a single 3.3V supply - no charge pump required ■ Interoperable with 5V logic ■ 1µA low current shutdown mode max ■ Guaranteed 12Mbps data rate ■ -7 to 12 common mode input voltage range ■ Half duplex versions available ■ Industry standard 75176 pinout ■ Current limiting and thermal shutdown for driver overload protection and one receiver in half duplex configuration. The ST3485E transmits and receives at a guaranteed data rate of at least 12Mbps. ■ Guaranteed high receiver output state for floating inputs with no signal present All transmitter outputs and receiver inputs are protected to ±15kV using Human Body Model. ■ Allow up to 64 transceivers on the bus Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. DIP-8 Description SO-8 The ST3485E is ±15kV ESD protected, 3.3V low power transceiver for RS-485 and RS-422 communications. The device contains one driver Order code Part number Temperature range Package Comments ST3485ECN 0 to 70 °C DIP-8 50parts per tube / 40tube per box ST3485EBN -40 to 85 °C DIP-8 50parts per tube / 40tube per box ST3485ECDR 0 to 70 °C SO-8 (Tape & Reel) 2500 parts per reel ST3485EBDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel April 2006 Rev 2 1/22 www.st.com 22 Contents ST3485E Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Test circuits and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/22 ST3485E Pin configuration 1 Pin configuration Figure 1. Pin connections Table 1. Pin description Pin n° Symbol Name and function 1 RO Receiver output. If A>B by 200mV, RO will be high; if A µs. 30-Aug-2005 3 Remove (TRUE) on title, description has been updated in cover page. The VTH and ∆VTH values are changed in table 10. 07-Apr-2006 4 Order codes has been updated and new template. 21/22 ST3485E Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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