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SP3238EEA Datasheet(PDF) 9 Page - Sipex Corporation |
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SP3238EEA Datasheet(HTML) 9 Page - Sipex Corporation |
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9 / 20 page  9 SP3238EDS/04 SP3238E +3.0V to +5.5V RS-232 Transceivers © Copyright 1999 Sipex Corporation The SP3238E drivers can maintain high data rates up to 250kbps fully loaded. 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 three drivers active at 120kbps with typical RS-232 loadsinparallelwith 1000pF capacitors. Figure 9 shows the test results where one driver was active at 250kbps and all three 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 applications. Receivers The receivers convert ±5.0V EIA/TIA-232 levels to TTL or CMOS logic output levels. All receivers have an inverting output that can be disabled by using the EN pin. Receivers are active when the Auto-Online 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. The truth table logic of the driver and receiver outputs can be found in Table 2. Figure 7. Loopback Test Circuit for RS-232 Driver Data Transmission Rates The SP3238E includes an additional non- inverting receiver with an output R 1OUT. R1OUT is an extra output that remains active and monitors activity while the other receiver outputs are forced into high impedance. This allows Ring Indicator (RI) from a peripheral to be monitored without forward biasing the TTL/CMOS inputs of the other devices connected to the receiver outputs. Figure 8. Loopback Test Circuit Result at 120kbps (All Drivers Fully Loaded) Figure 9. Loopback Test Circuit result at 235kbps (All Drivers Fully Loaded) TBD TBD SP3238E TxIN TxOUT 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 LOGIC INPUTS VCC 5k Ω RxIN RxOUT LOGIC OUTPUTS SHUTDOWN GND VCC ONLINE 1000pF |
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