LTC2854/LTC2855 3.3V 20Mbps RS485/RS422 Transceivers with Integrated Switchable Termination FEATURES DESCRIPTION n Integrated, Logic-Selectable 120 Termination Resistor The LTC 2854 and LTC2855 are low power, 20Mbps n 3.3V Supply Voltage RS485/RS422 transceivers operating on 3.3V supplies. n 20Mbps Maximum Data Rate The receiver includes a logic-selectable 120 termination, n No Damage or Latchup Up to 25kV HBM one-eighth unit load supporting up to 256 nodes per bus n High Input Impedance Supports 256 Nodes (C-, I-Grade) (C-, I-Grade), and a failsafe feature that guarantees a high n Operation Up to 125C (H-Grade) output state under conditions of floating or shorted inputs. n Guaranteed Failsafe Receiver Operation Over the The driver maintains a high output impedance over the Entire Common Mode Range entire common mode range when disabled or when the n Current Limited Drivers and Thermal Shutdown supply is removed. Excessive power dissipation caused by n Delayed Micropower Shutdown: 5A Maximum (C-, I-Grade) bus contention or a fault is prevented by current limiting n Power Up/Down Glitch-Free Driver Outputs all outputs and by a thermal shutdown. n Low Operating Current: 370A Typical in Receive Mode n Enhanced ESD protection allows the LTC2854 to withstand Compatible with TIA/EIA-485-A Specifications n 25kV (human body model) and the LTC2855 to withstand Available in 10-Pin 3mm 3mm DFN, 12-Pin 15kV on the transceiver interface pins without latchup 4mm3mm DFN and 16-Pin SSOP Packages or damage. APPLICATIONS n Low Power RS485/RS422 Transceiver PRODUCT SELECTION GUIDE n Level Translator PART NUMBER DUPLEX PACKAGE n Backplane Transceiver LTC2854 HALF DFN-10 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LTC2855 FULL SSOP-16, DFN-12 TYPICAL APPLICATION LTC2854 at 20Mbps into 54 LTC2854 LTC2854 RO R R RO DI RE RE TE TE 120 DE 120 DE A DI D D DI B 2V/DIV A-B LTC2854 285455 TA01 120 285455 TA01b R 20ns/DIV D RORE TE DE DI 285455fc 1 For more information www.linear.com/LTC2854LTC2854/LTC2855 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage (V ) ................................... 0.3V to 7V Operating Temperature (Note 4) CC Logic Input Voltages (RE, DE, DI, TE) ............ 0.3V to 7V LTC2854C, LTC2855C .............................. 0C to 70C Interface I/O: LTC2854I, LTC2855I ............................40C to 85C A, B, Y, Z .......................................(V 15V) to +15V LTC2854H, LTC2855H ....................... 40C to 125C CC (A-B) or (B-A) with Terminator Enabled ..................6V Storage Temperature Range .................. 65C to 150C Receiver Output Voltage (RO) ........0.3V to (V +0.3V) Lead Temperature (Soldering, 10 sec) CC GN Package ......................................................300C PIN CONFIGURATION TOP VIEW TOP VIEW TOP VIEW 1 16 RO V CC RO 1 12 V CC 2 15 RE A RO 1 10 V CC RE 2 11 A DE 3 14 B RE 2 9 B DE 3 10 B 13 11 4 DI 13 Z DE 3 8 A DI 4 9 Z 5 12 DI 4 7 NC TE Y TE 5 8 Y TE 5 6 GND GND 6 11 NC GND 6 7 NC NC 7 10 NC DD PACKAGE 8 9 NC NC 10-LEAD (3mm 3mm) PLASTIC DFN DE PACKAGE 12-LEAD (4mm 3mm) PLASTIC DFN EXPOSED PAD (PIN 11) PCB GND CONNECTION GN PACKAGE T = 150C, = 43C/W EXPOSED PAD (PIN 13) PCB GND CONNECTION JMAX JA 16-LEAD (NARROW 0.150) PLASTIC SSOP = 2.96C/W T = 150C, = 44C/W JC JMAX JA T = 150C, = 110C/W JMAX JA = 4.3C/W JC = 40C/W JC ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2854CDD PBF LTC2854CDD TRPBF LCQG 10-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC2854IDD PBF LTC2854IDD TRPBF LCQG 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC2854HDD PBF LTC2854HDD TRPBF LCQG 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC2855CDE PBF LTC2855CDE TRPBF 2855 12-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC2855IDE PBF LTC2855IDE TRPBF 2855 12-Lead (4mm 3mm) Plastic DFN 40C to 85C LTC2855HDE PBF LTC2855HDE TRPBF 2855 12-Lead (4mm 3mm) Plastic DFN 40C to 125C LTC2855CGN PBF LTC2855CGN TRPBF 2855 16-Lead (Narrow 0.150) Plastic SSOP 0C to 70C LTC2855IGN PBF LTC2855IGN TRPBF 2855I 16-Lead (Narrow 0.150) Plastic SSOP 40C to 85C LTC2855HGN PBF LTC2855HGN TRPBF 2855H 16-Lead (Narrow 0.150) Plastic SSOP 40C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2854CDD LTC2854CDD TR LCQG 10-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC2854IDD LTC2854IDD TR LCQG 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC2854HDD LTC2854HDD TR LCQG 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC2855CDE LTC2855CDE TR 2855 12-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC2855IDE LTC2855IDE TR 2855 12-Lead (4mm 3mm) Plastic DFN 40C to 85C LTC2855HDE LTC2855HDE TR 2855 12-Lead (4mm 3mm) Plastic DFN 40C to 125C LTC2855CGN LTC2855CGN TR 2855 16-Lead (Narrow 0.150) Plastic SSOP 0C to 70C LTC2855IGN LTC2855IGN TR 2855I 16-Lead (Narrow 0.150) Plastic SSOP 40C to 85C LTC2855HGN LTC2855HGN TR 2855H 16-Lead (Narrow 0.150) Plastic SSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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