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SP207E Datasheet(PDF) 9 Page - Exar Corporation |
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SP207E Datasheet(HTML) 9 Page - Exar Corporation |
9 / 19 page 9 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309 Figure6.Wake–UpTiming Table2.Shut-downandWake–UpTruthTables RECEIVER ENAbLE SP211E and SP213E 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 shared microprocessor data bus. For the SP211E, enable is active low; that is, ZeroV applied to the ENABLE pin will enable the receiver outputs. For the SP213E, enable is active high; that is, +5V applied to the ENABLE pin will enable the receiver outputs. +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 SP2E SD EN# Drivers Receivers 0 Active Tri-State 0 0 Active Active Off Tri-State 0 Off Tri-State SP23E SD# EN Drivers RX -3 RX 4-5 0 Off Tri-State Active 0 0 Off Tri-State Tr-State Active Active Active 0 Active Tri-State Tri-State |
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