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SP3232EBEN-L Datasheet(PDF) 9 Page - Exar Corporation |
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SP3232EBEN-L Datasheet(HTML) 9 Page - Exar Corporation |
9 / 24 page Receivers The Receivers convert EIA/TIA-232 levels to TTL or CMOS logic output levels. The SP3222EB receivers have an inverting tri-state output. These receiver outputs (RxOUT) are tri-stated when the enable control EN = HIGH. In the shutdown mode, the receivers can be active or inactive. EN has no effect on TxOUT. The truth table logic of the SP3222EB driver and receiver outputs can be found in Table 2. 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. Table 2. SP3222EB Truth Table Logic for Shutdown and Enable Control Figure 10. SP3222EB/SP3232EB Driver Loopback Test Circuit 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. Figure 12. Loopback Test results at 250kbps Figure 11. Loopback Test results at 120kbps 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 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7000• www.exar.com SP3222EB/SP3232EB_106_022316 9 |
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