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SP3238EECA-L Datasheet(PDF) 9 Page - Sipex Corporation |
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SP3238EECA-L Datasheet(HTML) 9 Page - Sipex Corporation |
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9 / 20 page  9 Date: 02/24/05 SP3238EE Intelligent +3.0V to +5.5V RS-232 Transceiver © Copyright 2005 Sipex Corporation Figure 7 shows a loopback test circuit used to test the RS-232 Drivers. Figure 8 shows the test results of the loopback circuit with all five driv- ers active at 120kbps with typical RS-232 loads in parallel with 1000pF capacitors. Figure 6 shows the test results where one driver was active at 250kbps and all five drivers loaded with an RS- 232 receiver in parallel with a 1000pF capacitor. A solid RS-232 data transmission rate of 120kbps provides compatibility with many designs in personal computer peripherals and LAN appli- cations. Receivers The receivers convert ±5.0V EIA/TIA-232 levels to TTL or CMOS logic output levels. Receivers are not active when in shutdown. If there is no activity present at the receivers for a period longer than 100 µs during AUTO ON- LINE® mode or when SHUTDOWN is enabled, the device goes into a standby mode where the circuit draws 1 µA. The truth table logic of the driver and receiver outputs can be found in Table 2. The SP3238EE includes an additional non- inverting receiver with an output R1OUT. R1OUT is an extra output that remains active and monitors activity while the other receiver outputs are forced into high impedance. This allows Ring Figure 7. Loopback Test Circuit for RS-232 Driver Data Transmission Rates Indicator (RI) from a peripheral to be monitored without forward biasing the TTL/CMOS inputs of the other devices connected to the receiver outputs. Since receiver input is usually from a transmission 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 Figure 8. Loopback Test Circuit Result at 120kbps (All Drivers Fully Loaded) Figure 9. Loopback Test Circuit result at 250kbps (All Drivers Fully Loaded) SP3238EE 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 SHUTDOWN GND VCC ONLINE 1000pF |
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