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LT1785AIS8-TRPBF Datasheet(PDF) 7 Page - Linear Technology |
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LT1785AIS8-TRPBF Datasheet(HTML) 7 Page - Linear Technology |
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7 / 16 page  LT1785/LT1785A/ LT1791/LT1791A 7 178491fb PIN FUNCTIONS RO: Receiver Output. TTL level logic output. If the receiver is active (RE pin low), RO is high if receiver input A ≥ B by 200mV. If A ≤ B by 200mV, then RO will be low. RO assumes a high impedance output state when RE is high or the part is powered off. RO is protected from output shorts from ground to 6V. RE: Receiver Output Enable. TTL level logic input. A logic low on RE enables normal operation of the receiver output RO. A logic high level at RE places the receiver output pin RO into a high impedance state. If receiver enable RE and driver enable DE are both in the disable state, the circuit- goes to a low power shutdown state. Placing either RE or DE into its active state brings the circuit out of shutdown. Shutdown state is not entered until a 3μs delay after both RE and DE are disabled, allowing for logic skews in tog- gling between transmit and receive modes of operation. For CAN bus applications, RE should be tied low to prevent the circuit from entering shutdown. DE: Driver Output Enable. TTL level logic input. A logic high on DE enables normal operation of the driver out- puts (Y and Z on LT1791, A and B on LT1785). A logic low level at DE places the driver output pins into a high impedance state. If receiver enable RE and driver enable DE are both in the disable state, the circuit goes to a low power shutdown state. Placing either RE or DE into its active state brings the circuit out of shutdown. Shutdown state is not entered until a 3μs delay after both RE and DE are disabled, allowing for logic skews in toggling between transmit and receive modes of operation. For CAN bus operation the DE pin is used for signal input to place the data bus in dominant or recessive states. DI: Driver Input. TTL level logic input. A logic high at DI causes driver output A or Y to a high state, and output B or Z to a low state. Complementary output states occur for DI low. For CAN bus applications DI should be tied low. GND: Ground. Y: Driver Output. The Y driver output is in phase with the driver input DI. In the LT1785 driver output Y is internally connected to receiver input A. The driver output assumes a high impedance state when DE is low, power is off or thermal shutdown is activated. The driver output is pro- tected from shorts between ±60V in both active and high impedance modes. For CAN applications, output Y is the CANL output node. Z: Driver Output. The Z driver output is opposite in phase to the driver input DI. In the LT1785 driver output Z is internally connected to receiver input B. The driver output assumes a high impedance state when DE is low, power is off or thermal shutdown is activated. The driver output is protected from shorts between ±60V in both active and high impedance modes. For CAN applications, output Z is the CANH output node. A: Receiver Input. The A receiver input forces a high receiver output when V(A) ≥ [V(B) + 200mV]. V(A) ≤ [V(B)– 200mV] forces a receiver output low. Receiver inputs A and B are protected against voltage faults between ±60V. The high input impedance allows up to 128 LT1785 or LT1791 transceivers on one RS485 data bus. The LT1785A/LT1791A have guaranteed receiver input thresholds –200mV < VTH < 0. Receiver outputs are guaranteed to be in a high state for 0V inputs. B: Receiver Input. The B receiver input forces a high receiver output when V(A) ≥ [V(B) + 200mV]. When V(A) ≤ [V(B) – 200mV], the B receiver forces a receiver output low. Receiver inputs A and B are protected against voltage faults between ±60V. The high input impedance allows up to 128 LT1785 or LT1791 transceivers on one RS485 data bus. The LT1785A/LT1791A have guaranteed receiver input- thresholds –200mV < VTH < 0. Receiver outputs are guaranteed to be in a high state for 0V inputs. VCC: Positive Supply Input. For RS422 or RS485 operation, 4.75V ≤ VCC ≤ 5.25V. Higher VCC input voltages increase output drive swing. VCC should be decoupled with a 0.1μF low ESR capacitor directly at Pin 8 (VCC). |
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Similar Description - LT1785AIS8-TRPBF |
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