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LTC1334CSW датащи(PDF) 7 Page - Linear Technology |
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LTC1334CSW датащи(HTML) 7 Page - Linear Technology |
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7 / 16 page ![]() 7 LTC1334 PI FU CTIO S RB2 (Pin 16): Receiver Output. RA2 (Pin 17): Receiver Output. DZ2/DE2 (Pin 18): RS232 Driver Input in RS232 Mode. RS485 Driver Enable with internal pull-up in RS485 mode. DY2 (Pin 19): Driver Input. ON/OFF (Pin 20): A high logic input enables the transceiv- ers. A low puts the device into shutdown mode and reduces ICC to 10µA. This pin has an internal pull-up. LB (Pin 21): Loopback Control Input. A low logic level enables internal loopback connections. This pin has an internal pull-up. DY1 (Pin 22): Driver Input. DZ1/DE1 (Pin 23): RS232 Driver Input in RS232 Mode. RS485 Driver Enable with internal pull-up in RS485 mode. RA1 (Pin 24): Receiver Output. RB1 (Pin 25): Receiver Output. VCC (Pin 26): Positive Supply; 4.75V ≤ VCC ≤ 5.25V C2– (Pin 27): Commutating Capacitor C2 Negative Termi- nal. Requires 0.1 µF external capacitor between Pins 27 and 28. C2+ (Pin 28): Commutating Capacitor C2 Positive Terminal. FU CTIO TABLES RS485 Driver Mode INPUTS OUTPUTS ON/OFF SEL DE D CONDITIONS Z Y 1 1 1 0 No Fault 0 1 1 1 1 1 No Fault 1 0 1 1 1 X Thermal Fault Z Z 11 0 X X Z Z 01 X X X Z Z RS232 Driver Mode INPUTS OUTPUTS ON/OFF SEL D CONDITIONS Y, Z 1 0 0 No Fault 1 1 0 1 No Fault 0 1 0 X Thermal Fault Z 00 X X Z RS485 Receiver Mode INPUTS OUTPUTS ON/OFF SEL B – A RA RB* 1 1 < – 0.2V 0 1 1 1 > 0.2V 1 1 1 1 Inputs Open 1 1 01 X Z Z *See Note 5 of Electrical Characteristics table. RS232 Receiver Mode INPUTS OUTPUTS ON/OFF SEL A, B RA, RB 10 0 1 10 1 0 1 0 Inputs Open 1 00 X Z 1 28 C2+ C2– C1+ VEE RB2 RA2 DZ2/DE2 DY2 ON/OFF LB DY1 DZ1/DE1 RA1 RB1 VCC 14 15 13 12 11 10 9 8 7 6 5 4 3 2 16 17 18 19 20 21 22 23 24 25 26 27 GND A2 B2 Y2 Z2 SEL2 SEL1 Z1 Y1 B1 A1 VDD C1– |
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