LTC2850/LTC2851/LTC2852 3.3V 20Mbps RS485/RS422 Transceivers FEATURES DESCRIPTION n 3.3V Supply Voltage The LTC 2850, LTC2851 and LTC2852 are low power, n 20Mbps Maximum Data Rate 20Mbps RS485/RS422 transceivers operating on 3.3V n No Damage or Latchup Up to 15kV HBM supplies. The receiver has a one-eighth unit load supporting n High Input Impedance Supports 256 Nodes up to 256 nodes per bus (C-, I-grade), and a failsafe feature (C-, I-Grade) that guarantees a high output state under conditions of n Operation Up to 125C (H-Grade) 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 bus contention or a fault is prevented by current limiting (C-, I-Grade) all outputs and by thermal shutdown. n Power Up/Down Glitch-Free Driver Outputs n Enhanced ESD protection allows these parts to withstand Low Operating Current: 370A Typical in up to 15kV (human body model) on the transceiver Receive Mode n interface pins without latchup or damage. Compatible with TIA/EIA-485-A Specifications n Available in 8-Pin and 10-Pin 3mm 3mm DFN, PART NUMBER DUPLEX PACKAGE 8-Pin and 10-Pin MSOP, and 8-Pin and 14-Pin LTC2850 Half SO-8, MSOP-8, DFN-8 SO Packages LTC2851 Full SO-8, MSOP-8, DFN-8 LTC2852 Full SO-14, MSOP-10, DFN-10 APPLICATIONS L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of n Linear Technology Corporation. All other trademarks are the property of their respective owners. Low Power RS485/RS422 Transceiver n Level Translator n Backplane Transceiver TYPICAL APPLICATION LTC2850 at 20Mbps Into 54 LTC2850 RO1 V CC1 R RE1 DI R T A DE1 D DI1 GND1 B 2V/DIV A-B LTC2850 R T RO2 V CC2 R RE2 285012 TA01b 20ns/DIV DE2 DI2 D GND2 285012 TA01a 285012fe 1 For more information www.linear.com/LTC2850LTC2850/LTC2851/LTC2852 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage (V ) ................................... 0.3V to 7V Operating Temperature (Note 4) CC Logic Input Voltages (RE, DE, DI) ................ 0.3V to 7V LTC285xC ................................................ 0C to 70C Interface I/O: LTC285xI .............................................40C to 85C A, B, Y, Z ....................................... (V 15V) to 15V LTC285xH .......................................... 40C to 125C CC Receiver Output Voltage (RO) .......0.3V to (V + 0.3V) LTC285xMP ....................................... 55C to 125C CC Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) MSOP ...............................................................300C PIN CONFIGURATION LTC2850 TOP VIEW TOP VIEW TOP VIEW RO 1 8 V RO 1 8 V CC CC RO 8 V 1 CC RE 2 7 B RE 2 7 B RE 2 7 B 9 DE 3 6 A DE 3 6 A DE 3 6 A DI 4 5 GND DI 4 5 GND DI GND 4 5 MS8 PACKAGE 8-LEAD PLASTIC MSOP S8 PACKAGE DD PACKAGE T = 150C, = 200C/W, = 40C/W JMAX JA JC 8-LEAD PLASTIC SO 8-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 150C/W, = 39C/W JMAX JA JC T = 150C, = 43C/W, = 3C/W JMAX JA JC EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB LTC2851 TOP VIEW TOP VIEW TOP VIEW V 1 8 A CC V 1 8 A CC V 1 8 A RO 2 7 B CC RO 7 B RO 2 7 B 9 2 DI Z 3 6 DI 3 6 Z DI 3 6 Z GND 4 5 Y GND 4 5 Y GND Y 4 5 MS8 PACKAGE 8-LEAD PLASTIC MSOP DD PACKAGE S8 PACKAGE T = 150C, = 200C/W, = 40C/W JMAX JA JC 8-LEAD (3mm 3mm) PLASTIC DFN 8-LEAD PLASTIC SO T = 150C, = 150C/W, = 39C/W JMAX JA JC T = 150C, = 43C/W, = 3C/W JMAX JA JC EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB LTC2852 TOP VIEW TOP VIEW NC 1 14 V CC RO 10 V 1 TOP VIEW CC RO 2 13 NC RE 2 9 A 10 RO 1 V CC RE 3 12 A 9 A RE 2 11 DE 3 8 B 8 B DE 3 DE 4 11 B DI 4 7 Z 7 Z DI 4 DI 5 10 Z 6 Y GND 5 6 Y GND 5 GND 6 9 Y MS PACKAGE DD PACKAGE 10-LEAD PLASTIC MSOP GND 7 8 NC 10-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 120C/W, = 45C/W JMAX JA JC T = 150C, = 43C/W, = 3C/W JMAX JA JC S PACKAGE EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB 14-LEAD PLASTIC SO T = 150C, = 88C/W, = 37C/W JMAX JA JC 285012fe 2 For more information www.linear.com/LTC2850