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SP207EA Datasheet(PDF) 8 Page - Sipex Corporation |
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SP207EA Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 15 page  REV: A DATE:12/03/2003 +5V High-Speed RS232 Transceivers © Copyright 2000 Sipex Corporation 8 Figure 5. Charge Pump — Phase 4 VCC = +5V +10V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – SHUTDOWN MODE The SP200, SP205, SP205B, SP206, SP206B, SP207B, SP211, SP211B and SP213 all feature a control input which will disable the device and reduce the power supply current to less than 10 µA, making the parts ideal for battery–pow- ered systems. In the “shutdown” mode the re- ceivers and transmitters will both be tri–stated. The V+ output of the charge pump will discharge to V CC, and the V – output will discharge to ground. Products with the WakeUp function can enable or disable the receivers during shutdown. For complete shutdown to occur and the 10 µA power drain to be realized, the following condi- tions must be met: SP200, SP205/B, SP206/B, SP207B and SP211/B: • +5V 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 • V CC must be +5V • Receiver inputs must be >0V and <+5V SP213: • 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 • V CC must be +5V • Receiver inputs must be >0V and <+5V WAKEUP FUNCTION The SP205B, SP206B, SP207B, SP211B and SP213 have a wake–up feature that keeps two or more receivers in an enabled state when the device is in the shutdown mode. The SP213 has two receivers active (R 4 and R5), while the SP205B, SP207B and SP211B have all receiv- ers active during shutdown. With only the re- ceivers active during shutdown, the devices draw 5–10 µA of supply current. ENABLE The SP205/B, SP206/B, SP207/B, SP211 and SP213 all feature an enable input, which allows the receiver outputs to be either tri–stated or enabled. This can be especially useful when the receiver is tied directly to a microprocessor data bus. For the SP205/B, SP206/B, SP207/B and SP211, enable is active low; that is, 0V applied to the ENABLE pin will enable the receiver outputs. For the SP213, enable is active high; that is, +5V applied to the ENABLE pin will enable the receiver outputs. SP213 Only Power Receiver SD EN SD EN Up/Down Outputs 00 11 Up Enable 01 10 Up Tri–state 10 01 Down Enable 11 00 Down Tri–state Table 2. Wake–Up Truth Table |
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Similar Description - SP207EA |
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