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XR32431EUCR-F Datasheet(PDF) 11 Page - Exar Corporation |
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XR32431EUCR-F Datasheet(HTML) 11 Page - Exar Corporation |
11 / 14 page © 2014 Exar Corporation XR32430/XR32431 11 / 13 exar.com/XR32430_XR32431 Rev 1A When the XR32430/31 is shut down, the charge pumps are turned off. V+ charge pump output decays to VCC, the V- output decays to GND. The decay time will depend on the size of capacitors used for the charge pump. Once in shutdown, the time required to exit the shut down state and have valid V+ and V- levels is typically 30μs. For easy programming, the STATUS can be used to indicate DSR or a Ring Indicator signal. Tying ONLINE and SHUT- DOWN together will bypass the AUTO ON-LINE® circuitry so this connection acts like a shutdown input pin. Table 2: XR32430/31 Operation Truth Table Valid RS-232 Level at Receiver Input Shutdown OnLine Driver Outputs Receiver Outputs Status Mode of Operation Yes L x High-Z High-Z H Manually forced shutdown No L x High-Z High-Z L Manually forced shutdown Yes H L Active Active H Normal Operation (Auto On-Line® enabled) No H L High-Z Active L Standby Operation due to Auto On-Line® circuitry Yes H H Active Active H Normal Operation No H H Active Active L Normal Operation Table 3: XR32430/31 Driver and Receiver Truth Table Shutdown RxIN RxOUT TxIN TxOUT L x High-Z x High-Z HLHLH HH L H L |
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