LINEAR 2PB_multiprotocolf LTC2870/LTC2871/LTC2872 Multiprotocol Transceivers
Contents
1. C1345 V 35 Data Clock SW 28 N 28 C1346A V 35 Data Clock SW 24 101387 RS232 RS562 RS422 RS485 128kbps 150kbps or 5Mbps SSOP 20 SW 20 TC1543 A530 EIA530 A RS232 S449 V 35 V 36 X 21 128kbps 10Mbps Data Clock SSOP 28 TC1544 A530 EIA530 A RS232 S449 V 35 V 36 X 21 128kbps 10Mbps Control LL SSOP 28 TC1545 A530 EIA530 A RS232 S449 V 35 V 36 X 21 128kbps 10Mbps Control LL RL TM SSOP 36 C1546 S449 V 35 V 36 X 21 128kbps 10Mbps Data Clock SSOP 28 C2844 A530 EIAS30 A RS232 S449 V 35 V 36 X 21 128kbps 10Mbps Control LL SSOP 28 C2845 A530 EIAS30 A RS232 S449 V 35 V 36 X 21 128kbps 10Mbps Control LL RL TM SSOP 36 C2846 A530 EIA530 A RS232 E R E R E R EIA530 EIA530 A RS232 R E R E R E RS449 V 35 V 36 X 21 128kbps 10Mbps Data Clock SSOP 36 C2847 EIA530 EIA530 A RS232 RS449 V 35 V 36 X 21 128kbps 10Mbps Data Clock QFN 38 C2870 RS232 RS485 RS422 500kbps 20Mbps QFN 28 TSSOP 28 C2871 RS232 RS485 RS422 500kbps 20Mbps QFN 38 SSOP 38 C2872 RS232 RS485 RS422 500kbps 20Mbps QFN 38 LTC2872 Typical Applications RS232 Mode RS485 Mode with Duplex Control 1 7V TO Vec 3V T0 5 5V2. 470nF 2 2F de RS485 FULL J HALF DUPLEX Vi CAP 22 H 2 2uF 2 24F ma T Vcc z www linear com multiprotocol 1 800 4 LINEAR 1 7V TO Vec Vi CAP 470 nF 22H 470nF 22H 2 2uF 2 24F 2 2uF o F T am Vec Vcc sw LTC2872 DY1 3V TO 5 5V Mixed Mode with RS485 Termination 1 7V TO Vec 3V TO 5 5V VL CAP SW RS485 LTC2872 oFF ON TERMINATION TE485 2 2uF 2 24F TECHNOLOGY 1011
3. RS485 Transceivers RS232 Transceivers 0 0 0 2 1 0 0 0 0 1 0 2 1 0 1 1 1 2 0 0 0 2 0 4 1 0 2 0 1 2 RS232 and RS485 O Pin Sharing per Port Shared Dedicated Shared HBM ESD Rating 26kV 16kV 16kV Packages 4mm x 5mm QFN 28 TSSOP 28 5mm x 7mm QFN 38 TSSOP 38 LY MYR 4 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 5mm x 7mm QFN 38 Number Drivers Receivers Protocols Supported Supported Data Rate RS232 RS562 RS422 RS485 V 35 Async V 35 Sync Termi nation Additional DCE or DTE Signals Signals Packages LTC1321 2 RS232 RS562 RS422 RS485 120kbps 10Mbps SW 24 N 24 LTC1322 RS232 RS562 RS422 RS485 120kbps 10Mbps SW 24 N 24 LTC1323 LocalTalk RS232 RS422 120kbps 2Mbps Data Control SW 24 SO 24 LTC1334 4 3 4 RS232 RS562 RS422 RS485 120kbps 5Mbps SSOP 28 SW 28 N 28 LTC1335 RS562 RS422 RS485 120kbps 10Mbps SW 24 N 24 LTC1343 EIA530 EIA530 A RS232 RS449 V 35 V 36 X 21 DTE or DCE Data Clock or Control LL RL TM SSOP 44 LTC1344 EIA530 EIA530 A RS232 RS449 V 35 V 36 X 21 SSOP 24 LTC1344A EIA530 EIA530 A RS232 RS449 V 35 V 36 X 21 SSOP 24
4. LTC2870 LTC2871 LTC2872 Multiprotocol Transceivers 1 8V to Vec 3V to 5 5V RS485 TERMINATION OFF ON RS485 The LTC 2870 71 72 is a family of multiprotocol transceivers with switchable integrated termination for 3 3V and 5V systems These devices integrate pin controlled termination resistors that automatically switch in or out to match the transceiver s protocol selection of RS232 or RS485 allowing for easy interface reconfiguration and elimination of external resistors and control relays The LTC2870 and LTC2871 can be configured as two RS232 single ended transceivers or one RS485 differential transceiver on shared LTC2870 or dedicated LTC2871 I O lines while the LTC2872 can be configured as four RS232 transceivers or two RS485 transceivers or combinations of both on shared O lines This on the fly configurability helps reduce component count for multiprotocol networks Features 3V to 5 5V Supply Voltage Range One RS485 or Two RS232 Transceivers per Port 20Mbps RS485 and 500kbps RS232 Automatic Selection of Integrated RS485 120Q and RS232 5kQ Termination Resistors Pin Selectable Half or Full Duplex Mode RS485 Logic Loopback Mode High ESD 26kV LTC2870 or 16kV LTC287 1 LTC2872 On Line I O 4kV On All Other Pins 1 7V to 5 5V Logic Interface Supports Up to 256 RS485 Nodes Full Failsafe RS485 Receiver Eliminates UART Lockup Number of Ports 1 1 2 Possible Configurations
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LINEAR 2PB_multiprotocolf LTC2870/LTC2871/LTC2872 Multiprotocol Transceivers