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SP3223E Datasheet(PDF) 10 Page - Sipex Corporation |
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SP3223E Datasheet(HTML) 10 Page - Sipex Corporation |
10 / 23 page Date: 10/06/06 SP3223 +3.0V to +5.5V RS-232 Transceivers © Copyright 200 6 Sipex Corporation 10 Receivers The receivers convert ±5.0V EIA/TIA-232 levels to TTL or CMOS logic output levels. Receivers have an inverting output that can be disabled by using the EN pin. Receivers are active when the AUTO ON-LINE® circuitry is enabled or when in shutdown. During the shutdown, the receivers will continue to be active. If there is no activity present at the receivers for a period longer than 100 µs or when SHUTDOWN is enabled, the device goes into a standby mode where the circuit draws 1 µA. Driving EN to a logic HIGH forces the outputs of the receivers into high-impedance. The truth table logic of the SP3223 driver and receiver outputs can be found in Table 2. 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 5K Ω pulldown resistor to ground will commit the output of the receiver to a HIGH state. Table 2. SHUTDOWN and EN Truth Tables Note: In AUTO 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 14. Loopback Test Circuit for RS-232 Driver Data Transmission Rates Charge Pump The charge pump is a Sipex–patented 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 symmetrical 5.5V power supplies. The internal power supply Figure 15. Loopback Test Circuit result at 235Kbps (All Drivers Fully Loaded) T1 IN T1 OUT R1 OUT SP3223 2 4 6 5 3 7 19 GND T 1IN T XIN C1+ C1- C2+ C2- V+ V- VCC 0.1µF 0.1µF 0.1µF + C2 C5 C1 + + C3 C4 + + 0.1µF 0.1µF TTL/CMOS INPUTS +3V to +5V 18 SHUTDOWN 20 5KΩ R 1OUT 5KΩ R XIN R XOUT TTL/CMOS OUTPUTS EN 1 ONLINE 14 R 1IN T XOUT T 1OUT 11 STATUS VCC To µP Supervisor Circuit 1000pF 1000pF 3 2 2 3 P S : E C I V E D N W O D T U H SN ET X T U OR X T U O 00 Z h g i He v i t c A 01 Z h g i HZ h g i H 10 e v i t c Ae v i t c A 11 e v i t c AZ h g i H |
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