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ST3243 Datasheet(PDF) 4 Page - STMicroelectronics |
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ST3243 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 20 page Pin configuration ST3243 4/20 1.1 Truth table Note: If the part is in auto-powerdown mode (FORCE OFF = VCC, FORCE ON = GND) it is shutdown, if no valid RS-232 levels are present on all receiver input 18 R2OUT Second receiver output voltage 19 R1OUT First receiver output voltage 20 R2OUTB Non-inverting complementary receiver output, always active for wake-up 21 INVALID Output of the valid signal detector. Indicates if a valid RS-232 level is present on receiver inputs logic "1" 22 FORCEOFF Drive low to shut down transmitters and on-board power supply. This over- rides all automatic circuitry and FORCEON 23 FORCEON Drive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high) 24 C1- Negative terminal of voltage-charge pump capacitor 25 GND Ground 26 VCC Supply voltage 27 V+ 5.5V Generated by the charge pump 28 C1+ Positive terminal of voltage-charge pump capacitor Table 1. Pin description Pin n° Symbol Name and function Table 2. FORCE OFF TOUT ROUT R2OUTB 0 HIGH Z HIGH Z ACTIVE Note: 1 ACTIVE Note: ACTIVE Note: ACTIVE Note: |
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