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LTC2851IS Datasheet(PDF) 10 Page - Linear Technology |
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LTC2851IS Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LTC2850/LTC2851/LTC2852 10 285012fc BLOCK DIAGRAM SLEEP/SHUTDOWN LOGIC AND DELAY RECEIVER DRIVER RO RE DE DI A (15kV) VCC GND B (15kV) 285012 BDa RECEIVER DRIVER RO DI 285012 BDb A (15kV) Z (15kV) Y (15kV) B (15kV) VCC GND SLEEP/SHUTDOWN LOGIC AND DELAY RECEIVER DRIVER RO RE DE DI 285012 BDc A (15kV) Z (15kV) Y (15kV) B (15kV) VCC GND LTC2850 LTC2851 LTC2852 APPLICATIONS INFORMATION Driver The driver provides full RS485/RS422 compatibility. When enabled, if DI is high, Y-Z is positive for the full-duplex devices (LTC2851, LTC2852) and A-B is positive for the half-duplex device (LTC2850). When the driver is disabled, both outputs are high-im- pedance. For the full-duplex devices, the leakage on the driver output pins is guaranteed to be less than 10μA over the entire common mode range of –7V to 12V. On the half-duplex LTC2850, the impedance is dominated by the receiver input resistance, RIN. Driver Overvoltage and Overcurrent Protection The driver outputs are protected from short-circuits to any voltage within the Absolute Maximum range of (VCC – 15V) to 15V. The typical peak current in this condition does not exceed 180mA. If a high driver output is shorted to a voltage just above VCC, a reverse current will flow into the supply. When this voltage exceeds VCCbyabout1.4V,thereversecurrentturns off. Preventing the driver from turning off with outputs shorted to output voltages just above VCC keeps the driver active even for receiver loads that have a positive common mode with respect to the driver – a valid condition. The worst-case peak reverse short-circuit current can be as high as 300mA in extreme cold conditions. If this current can not be absorbed by the supply, a 3.6V zener diode can be added in parallel with the supply to sink this current. All devices also feature thermal shutdown protection that disables the driver and receiver in case of excessive power dissipation (see Note 4). Receiver and Failsafe With the receiver enabled, when the absolute value of the differential voltage between the A and B pins is greater than 200mV, the state of RO will reflect the polarity of (A-B). These parts have a failsafe feature that guarantees the receiver output to be in a logic-high state when the inputs are either shorted, left open, or terminated but not driven. This failsafe feature is guaranteed to work for inputs span- ning the entire common mode range of –7V to 12V. The receiver output is internally driven high (to VCC) or low (to ground) with no external pull-up needed. When the receiver is disabled the RO pin becomes High-Z with leakage of less than ±1μA for voltages within the supply range. |
Similar Part No. - LTC2851IS |
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Similar Description - LTC2851IS |
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