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SP208EHEP Datasheet(PDF) 8 Page - Sipex Corporation |
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SP208EHEP Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 16 page  SP207EHDS/08 SP207EH Series High Performance RS232 Transceivers © Copyright 2000 Sipex Corporation 8 Figure 6. Wake–Up Timing +5V 0V ENABLE DISABLE SD ROUT DATA VALID +5V 0V ROUT +5V 0V ROUT tWAIT t0 (POWERUP) ENABLE DISABLE SD POWER UP WITH SD ACTIVE (Charge pump in shutdown mode) POWER UP WITH SD DISABLED (Charge pump in active mode) t0 (POWERUP) tENABLE DATA VALID SD DATA VALID DATA VALID DATA VALID EXERCISING WAKE–UP FEATURE t0 (POWERUP) tENABLE tENABLE tENABLE tWAIT DISABLE DISABLE ENABLE tWAIT = 2ms typical, 3ms maximum tENABLE = 1ms typical, 2ms maximum VCC = +5V ±10%; TA = 25°C SP213EH Only Power Receiver SD EN SD EN Up/Down Outputs 0 0 1 1 Up Enable 0 1 1 0 Up Tri–state 1 0 0 1 Down Enable 1 1 0 0 Down Tri–state Table 2. Wake–Up Truth Table ENABLE The SP211EH and SP213EH 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 di- rectly to a microprocessor data bus. For the SP211EH, enable is active low; that is, 0V applied to the ENABLE pin will enable the receiver outputs. For the SP213EH, enable is active high; that is, +5V applied to the ENABLE pin will enable the receiver outputs. |
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