LTC2856-1/LTC2856-2 LTC2857-1/LTC2857-2 LTC2858-1/LTC2858-2 20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceivers FEATURES DESCRIPTION n 20Mbps or Low EMI 250kbps Maximum Data Rate The LTC 2856-1, LTC2856-2, LTC2857-1, LTC2857-2, n No Damage or Latchup to ESD: 15kV HBM LTC2858-1 and LTC2858-2 are low power, RS485/RS422 n High Input Impedance Supports 256 Nodes transceivers operating on 5V supplies at maximum data (C, I-Grade) rates of 20Mbps or 250kbps for low EMI. The receiver has n Operation Up to 125C (H-Grade) a one-eighth unit load, supporting up to 256 nodes per bus n Guaranteed Failsafe Receiver Operation Over the (C, I-Grade), and a failsafe feature that guarantees a high Entire Common Mode Range output state under conditions of floating or shorted inputs. n Current Limited Drivers and Thermal Shutdown The driver maintains a high output impedance over the n Delayed Micropower Shutdown: 5A Maximum entire common mode range when disabled or when the (C, I-Grade) supply is removed. Excessive power dissipation caused n Power Up/Down Glitch-Free Driver Outputs by bus contention or a fault is prevented by current limit- n Low Operating Current: 900A Maximum in Receive ing all outputs and by thermal shutdown. Mode n Enhanced ESD protection allows these parts to withstand Compatible with TIA/EIA-485-A Specifications n 15kV (human body model) on the transceiver interface Available in 8-Lead and 10-Lead 3mm 3mm DFN pins without latchup or damage. and 8-Lead and 10-Lead MSOP Packages PART MAX DATA APPLICATIONS NUMBER RATE (Mbps) DUPLEX PACKAGE LTC2856-1 20 Half MSOP-8, DFN-8 n Low Power RS485/RS422 Transceiver LTC2856-2 0.25 Half MSOP-8, DFN-8 n Level Translator LTC2857-1 20 Full MSOP-8, DFN-8 n Backplane Transceiver LTC2857-2 0.25 Full MSOP-8, DFN-8 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of LTC2858-1 20 Full MSOP-10, DFN-10 AnalogDevices, Inc. All other trademarks are the property of their respective owners. LTC2858-2 0.25 Full MSOP-10, DFN-10 TYPICAL APPLICATION LTC2858-1 at 20Mbps LTC2856-1 RO1 V CC1 R DI RE1 R T DE1 Y D DI1 GND1 Z LTC2856-1 R T Y-Z RO2 V CC2 R RE2 DE2 D DI2 GND2 2856 TA01b 285678 TA01a 20ns/DIV 285678fg 1 For more information www.linear.com/LTC2856-1 2V/DIVLTC2856-1/LTC2856-2 LTC2857-1/LTC2857-2 LTC2858-1/LTC2858-2 ABSOLUTE MAXIMUM RATINGS (Note 1) Storage Temperature Range Supply Voltage (V ) ................................... 0.3V to 7V CC MSOP ................................................ 65C to 150C Logic Input Voltages (RE, DE, DI) ................ 0.3V to 7V DFN .................................................... 65C to 150C Interface I/O (A, B, Y, Z) .................... (V 15V) to 15V CC Lead Temperature (Soldering, 10 sec) Receiver Output Voltage (RO) .......0.3V to (V + 0.3V) CC MSOP ...............................................................300C Operating Temperature Range (Note 4) LTC285xC ................................................ 0C to 70C LTC285xI .............................................40C to 85C LTC285xH .......................................... 40C to 125C PACKAGE INFORMATION LTC2856 TOP VIEW TOP VIEW RO 1 8 V CC RO 1 8 V CC RE 2 7 B RE 2 7 B 9 DE 3 6 A DE 3 6 A DI 4 5 GND DI 4 5 GND MS8 PACKAGE 8-LEAD PLASTIC MSOP DD PACKAGE T = 150C, = 163C/W, = 40C/W 8-LEAD (3mm 3mm) PLASTIC DFN JMAX JA JC EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB T = 150C, = 43C/W, = 5.5C/W JMAX JA JC LTC2857 TOP VIEW TOP VIEW V 1 8 A CC V 1 8 A CC RO 2 7 B RO 2 7 B 9 6 Z DI 3 DI 3 6 Z GND 4 5 Y GND Y 4 5 MS8 PACKAGE 8-LEAD PLASTIC MSOP DD PACKAGE T = 150C, = 163C/W, = 40C/W JMAX JA JC 8-LEAD (3mm 3mm) PLASTIC DFN EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB T = 150C, = 43C/W, = 5.5C/W JMAX JA JC LTC2858 TOP VIEW TOP VIEW RO 1 10 V CC RO 1 10 V CC RE 2 9 A RE 2 9 A 11 DE 3 8 B DE 3 8 B DI 4 7 Z DI 4 7 Z GND 5 6 Y 6 GND 5 Y MS PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 160C/W, = 45C/W JMAX JA JC EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB T = 150C, = 43C/W, = 5.5C/W JMAX JA JC 285678fg 2 For more information www.linear.com/LTC2856-1