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LTC2854IDD Datasheet(PDF) 1 Page - Linear Technology |
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LTC2854IDD Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC2854/LTC2855 1 285455fa FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION PRODUCT SELECTION GUIDE 3.3V 20Mbps RS485/RS422 Transceivers with Integrated Switchable Termination The LTC®2854 and LTC2855 are low power, 20Mbps RS485/RS422 transceivers operating on 3.3V supplies. The receiver includes a logic-selectable 120Ω termina- tion, one-eighth unit load supporting up to 256 nodes per bus (C, I-Grade), and a failsafe feature that guarantees a high output state under conditions of floating or shorted inputs. The driver 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. Enhanced ESD protection allows the LTC2854 to withstand ±25kV (human body model) and the LTC2855 to withstand ±15kV on the transceiver interface pins without latchup or damage. ■ Low Power RS485/RS422 Transceiver ■ Level Translator ■ Backplane Transceiver ■ Integrated, Logic-Selectable 120Ω Termination Resistor ■ 3.3V Supply Voltage ■ 20Mbps Maximum Data Rate ■ No Damage or Latchup Up to ±25kV HBM ■ High Input Impedance Supports 256 Nodes (C, I-Grade) ■ Operation Up to 125°C (H-Grade) ■ Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range ■ Current Limited Drivers and Thermal Shutdown ■ Delayed Micropower Shutdown: 5μA Maximum (C, I-Grade) ■ Power Up/Down Glitch-Free Driver Outputs ■ Low Operating Current: 370μA Typical in Receive Mode ■ Compatible with TIA/EIA-485-A Specifications ■ Available in 10-Pin 3mm × 3mm DFN, 12-Pin 4mm × 3mm DFN and 16-Pin SSOP Packages LTC2854 at 20Mbps into 54Ω PART NUMBER DUPLEX PACKAGE LTC2854 HALF DFN-10 LTC2855 FULL SSOP-16, DFN-12 RE TE RO DE DI R D 285455 TA01 LTC2854 120 Ω RE RO TE DE DI R D LTC2854 120 Ω RE RO TE DE DI R D LTC2854 120 Ω , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 20ns/DIV 2V/DIV 285455 TA01b A-B B A DI |
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