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SP207ECA-L Datasheet(PDF) 8 Page - Exar Corporation |
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SP207ECA-L Datasheet(HTML) 8 Page - Exar Corporation |
8 / 19 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309 8 SHuTDOwN MODE SP211E and SP213E feature a control input which will shut down the device and reduce the power supply current to less than 0µA, making the parts ideal for battery–powered systems. Inshutdownmodethetransmitters will be tri–stated, the V+output of the charge pump will discharge to VCC, and the V–output will discharge to ground. Shutdown will tri- state all receiver outputs of the SP211E. SP213E wAKEuP FuNCTION On the SP213E, shutdown will tri-state re- ceivers -3. Receivers 4 and 5 remain active to provide a “wake-up” function and may be used to monitor handshaking and control inputsforactivity.Withonlytworeceivers active during shutdown, the SP213E draws only 5–0µA of supply current. ManystandardUARTdevicesmaybecon- figuredtogenerateaninterruptsignalbased on changes to the Ring Indicate (RI) or other inputs. A typical application of this function would be to detect modem activity with the computer in a power–down mode. The ring indicator signal from the modem could be passed through an active receiver in the SP213E that is itself in the shutdown mode. The ring indicator signal would propagate through the SP213E to the power manage- ment circuitry of the computer to power up the microprocessor and the SP213E driv- ers. After the supply voltage to the SP213E reaches +5.0V, the SHUTDOWN pin can be disabled, taking the SP213E out of the shutdown mode. All receivers that are active during shutdown maintain 500mV (typ.) of hysteresis. All receivers on the SP213E may be put into tri-state using the ENABLE pin. SHuTDOwN CONDITIONS For complete shutdown to occur and the 0µA power drain to be realized, the follow- ingconditionsmustbemet: SP211E: • +5V must be applied to the SD pin • ENABLE must be either Ground, +5.0V or not connected • the transmitter inputs must be either +5.0V or not connected • VCC must be +5V • Receiver inputs must be >0V and <+5V SP213E: • 0V must be applied to the SD pin • ENABLE must be either 0V, +5.0V or not connected • the transmitter inputs must be either +5.0V or not connected • VCC must be +5V • Receiver inputs must be >0V and <+5V |
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