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LTC486CS Datasheet(PDF) 5 Page - Linear Technology |
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LTC486CS Datasheet(HTML) 5 Page - Linear Technology |
5 / 8 page 5 LTC486 Figure 1. Driver DC Test Load Figure 3. Driver Timing Test Load #2 Figure 2. Driver Timing Test Circuit DRIVER LTC486 • TA03 EN DI A B EN RDIFF CI1 CI2 TEST CIRCUITS GND (Pin 8): Ground Connection. DI3 (Pin 9): Driver 3 Input. Refer to DI1. DO3A (Pin 10): Driver 3 Output. DO3B (Pin 11): Driver 3 Output. EN (Pin 12): Driver Outputs Disabled. See Function Table for details. DO4B (Pin 13): Driver 4 Output. DO4A (Pin 14): Driver 4 Output. DI4 (Pin 15): Driver 4 Input. Refer to DI1. VCC (Pin 16): Positive Supply; 4.75V < VCC < 5.25V . DI1 (Pin 1): Driver 1 Input. If Driver 1 is enabled, then a low on DI1 forces the driver outputs DO1A low and DO1B high. A high on DI1 with the driver outputs enabled will force DO1A high and DO1B low. DO1A (Pin 2): Driver 1 Output. DO1B (Pin 3): Driver 1 Output. EN (Pin 4): Driver Outputs Enabled. See Function Table for details. DO2B (Pin 5): Driver 2 Output. DO2A (Pin 6): Driver 2 Output. DI2 (Pin 7): Driver 2 Input. Refer to DI1. PI FU C S TI S APPLICATI I FOR ATIO Typical Application A typical connection of the LTC486 is shown in Figure 6. A twisted pair of wires connect up to 32 drivers and receivers for half duplex data transmission. There are no restrictions on where the chips are connected to the wires, and it isn’t necessary to have the chips connected at the ends. However, the wires must be terminated only at the ends with a resistor equal to their characteristic impedance, typically 120 Ω. The optional shields around the twisted pair help reduce unwanted noise, and are connected to GND at one end. Thermal Shutdown The LTC486 has a thermal shutdown feature which pro- tects the part from excessive power dissipation. If the outputs of the driver are accidently shorted to a power supply or low impedance source, up to 250mA can flow through the part. The thermal shutdown circuit disables the driver outputs when the internal temperature reaches 150 °Candturnsthembackonwhenthetemperaturecools to 130 °C. If the outputs of two or more LTC486 drivers are shorted directly, the driver outputs can not supply enough current to activate the thermal shutdown. Thus, the ther- mal shutdown circuit will not prevent contention faults when two drivers are active on the bus at the same time. Cable and Data Rate The transmission line of choice for RS485 applications is a twisted pair. There are coaxial cables (twinaxial) made for this purpose that contain straight pairs, but these are less flexible, more bulky, and more costly than twisted pairs. Many cable manufacturers offer a broad range of 120 Ω cables designed for RS485 applications. LTC486 • TA02 A B R R OD V OC V LTC486 • TA04 OUTPUT UNDER TEST CL S1 500 CC V Ω S2 |
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