LTC1387CG#PBF UART Interface IC RS-232 Interface IC 1x 5V RS232/RS485 Multiprotocol Tran
uart multiplexer ic
,uart level shifter ic
LTC1387CG#PBF UART Interface IC RS-232 Interface IC 1x 5V RS232/RS485 Multiprotocol Tran
FEATURES
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Two RS232 Transceivers or One RS485 Transceiver
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Operates from a Single 5V Supply
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Guaranteed Receiver Output with Inputs
Floating or Shorted to Ground
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Logic Selectable Fast/Slow RS485 Driver Slew Rate
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Low Supply Current: 7mA Typical
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5μA Supply Current in Shutdown
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Self-Testing Capability in Loopback Mode
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Separate Driver and Receiver Enable Controls
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Driver Maintains High Impedance in Three-State,
Shutdown or with Power Off
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Receiver Inputs Can Withstand ±25V
APPLICATIONS
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Point-of-Sale Terminals
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Software Selectable Multiprotocol Interface Ports
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Low Power RS485/RS422/RS232/EIA562 Interface
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Cable Repeaters
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Level Translators
DESCRIPTIO
The LTC®1387 is a low power reconfigurable CMOS bidi- rectional transceiver. It can be configured as an RS485 differential port or as two RS232 single-ended ports. An onboard charge pump uses four 0.1μF capacitors to generate boosted positive and negative supplies, allowing the RS232 drivers to meet ±5V output swing require- ments with only a single 5V supply. A shutdown mode reduces the ICC supply current to 5μA.
The RS232 transceivers are in full compliance with RS232 specification. The RS485 transceiver is in full compliance with RS485 and RS422 specifications. The RS485 re- ceiver assumes a known output state when the inputs are floating or shorted to ground. All interface drivers feature short-circuit and thermal shutdown protection. An enable pin allows RS485 driver outputs to be forced into high impedance which is maintained even when the outputs are forced beyond supply rails or the power is off. A loop back mode allows the driver outputs to be connected back to the receiver inputs for diagnostic self-test.
The LTC1387 is available in 20-pin plastic SSOP and SW packages.
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