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LT1785 Datasheet(PDF) 1 Page - Linear Technology |
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LT1785 Datasheet(HTML) 1 Page - Linear Technology |
1 / 18 page LTC2859/LTC2861 1 285961fc 20Mbps RS485 Transceivers with Integrated Switchable Termination The LTC®2859 and LTC2861 are low power, 20Mbps RS485/422 transceivers operating on 5V supplies. The receiver includes a logic-selectable 120Ω termination, one-eighth unit load supporting up to 256 nodes per bus (C-, I-grades), and a failsafe feature that guarantees a high outputstateunderconditionsoffloatingorshortedinputs. The driver features a logic-selectable low-EMI 250kbps operating mode, and maintains a high output impedance over the entire common mode range when disabled or when the supply is removed. Excessive power dissipation caused by bus contention or a fault is prevented by current limiting all outputs and by a thermal shutdown. EnhancedESDprotectionallowstheLTC2859andLTC2861 towithstand±15kV(humanbodymodel)onthetransceiver interface pins without latchup or damage. n Low Power RS485/RS422 Transceiver n Level Translator n Backplane Transceiver n Integrated, Logic-Selectable 120Ω Termination Resistor n 20Mbps Max Data Rate n No Damage or Latchup to ESD: ±15kV HBM n High Input Impedance Supports 256 Nodes (C-, I-Grades) n Operation Up to 105°C (LTC2859H) n 250kbps Low-EMI Mode n Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range n Current Limited Drivers and Thermal Shutdown n Delayed Micropower Shutdown (5µA Max) n Power Up/Down Glitch-Free Driver Outputs n Low Operating Current (900µA Max in Receive Mode) n Meets All TIA/EIA-485-A Specifications n Available in 10-Pin 3mm × 3mm DFN, 12-Pin 4mm × 3mm DFN and 16-Pin SSOP Packages LTC2859 at 20Mbps PART NUMBER DUPLEX PACKAGE LTC2859 Half DFN-10 LTC2861 Full SSOP-16, DFN-12 Typical applicaTion FeaTures applicaTions DescripTion proDucT selecTion GuiDe L , LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 285961 TA02 20ns/DIV 2V/DIV DI Y–Z Y Z RE TE RO DE DI SLO R D 2859/61 TA01 LTC2859 120Ω RE RO TE DE DI SLO R D LTC2859 120Ω RE RO TE DE DI SLO R D LTC2859 120Ω |
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