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SP3243EBER-L Datasheet(PDF) 9 Page - Exar Corporation |
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SP3243EBER-L Datasheet(HTML) 9 Page - Exar Corporation |
9 / 24 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3243E_100_072309 9 Receivers The receivers convert +5.0V EIA/TIA-232 levels to TTL or CMOS logic output levels. Re- ceivers are High-Z when the AUTO ON-LINE® circuitry is enabled or when in shutdown. The truth table logic of the SP3243 driver and receiver outputs can be found in Table 2. The SP3243E includes an additional non-in- verting receiver with an output R 2OUT. R2OUT is an extra output that remains active and monitors activity while the other receiver outputs are forced into high impedance. This allows a Ring Indicator (RI) signal from a peripheral to be monitored without forward biasing the TTL/CMOS inputs of the other devices connected to the receiver outputs. Table 2. SHUTDOWN Truth Tables Note: InAUTO ON-LINE® Mode where ONLINE = GND and SHUTDOWN = V CC, the device will shut down if there is no activity present at the Receiver inputs. Figure 11. Loopback Test Circuit for RS-232 Driver Data Transmission Rates Since receiver input is usually from a transmis- sion 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. Figure 13. Loopback Test results at 250Kbps Figure 12. Loopback Test results at 1Mbps SP3243 GND T1IN TXIN C1+ C1- C2+ C2- V+ V- VCC 0.1 µF 0.1 µF 0.1 µF + C2 C5 C1 + + C3 C4 + + 0.1 µF 0.1 µF TTL/CMOS INPUTS +3V to +5V 18 SHUTDOWN 5KΩ R1OUT 5KΩ RXIN RXOUT TTL/CMOS OUTPUTS ONLINE R1IN TXOUT T1OUT STATUS VCC To µP Supervisor Circuit 1000pF 1000pF Device: SP3243E SHUTDOWN TxOUT RxOUT R2OUT 0 High-Z High-Z Active 1 Active Active Active |
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