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SP3222EUCT-L Datasheet(PDF) 9 Page - Exar Corporation |
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SP3222EUCT-L Datasheet(HTML) 9 Page - Exar Corporation |
9 / 20 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3222EU/SP3232EU_102_031413 9 Since receiver input is usually from a trans- mission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 300mV. This ensures that the receiver is virtually immune to noisy transmission lines. Should an input be left unconnected, an internal 5kΩ pulldown resistor to ground will commit the output of the receiver to a HIGH state. Charge Pump The charge pump is an Exar-patended design (U.S. 5,306,954) and uses a unique approach compared to older less-efficient designs. The charge pump still requires four external capacitors, but uses a four-phase voltage shifting technique to attain sym- metrical 5.5V power supplies. The internal power supply consists of a regulated dual charge pump that provides output voltages of +/-5.5V regardless of the input voltage (Vcc) over the +3.0V to +5.5V range. In most circumstances, decoupling the power supply can be achieved adequately using a 0.1µF bypass capacitor at C5 (refer to figures 9 and 10). In applications that are sensitive to power-supply noise, decouple Vcc to ground with a capacitor of the same value as charge-pump capacitor C1. Physi- cally connect bypass capcitors as close to the IC as possible. Table 2. SP3222EU Truth Table Logic for Shutdown and Enable Control Figure 11. SP3222EU/SP3232EU Driver Loopback Test Circuit Figure 13. Loopback Test results at 1000kbps Figure 12. Loopback Test results at 250kbps SP3222EU SP3232EU GND TxIN TxOUT C1+ C1- C2+ C2- V+ V- VCC 0.1µF 0.1µF 0.1µF + C2 C5 C1 + + C3 C4 + + 0.1µF 0.1µF LOGIC INPUTS VCC 5kΩ RxIN RxOUT LOGIC OUTPUTS EN* *SHDN 250pF or 1000pF VCC * SP3222EU only SHDN EN TxOUT RxOUT 0 0 Tri-state Active 0 1 Tri-state Tri-state 1 0 Active Active 1 1 Active Tri-state DESCRIPTION |
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