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SP236ACX Datasheet(PDF) 8 Page - Sipex Corporation |
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SP236ACX Datasheet(HTML) 8 Page - Sipex Corporation |
8 / 17 page Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers © Copyright 2004 Sipex Corporation 8 ENABLE Input (EN) The SP235A/B, SP236A/B, SP240A/B, and SP241A/B all feature an enable input (EN), which allows the receiver outputs to be either tri–stated or enabled. The enable input is active low; 0V applied to EN will enable the receiver outputs. This can be especially useful when the receiver is tied directly to a microprocessor data bus. Protection From Shorts to >±15V The driver outputs are protected against shorts to ground, other driver outputs, and V+ or V-. For protection against voltages exceeding ±15V, two back–to–back zener diodes connected to clamp the outputs to an acceptable voltage level are recommended. (Refer to Figure 3.) Improved Drive Capability for Mouse Applications Each of the devices in this data sheet have improved drive capability for non-standard ap- plications. Although the EIA RS-232D stan- dards specify the maximum loading to be 3k Ω and 2500pF, the SP230A, SP234A, SP235A/B, SP236A/B, SP237A, SP238A, SP240A/B, and SP241A/B can typically drive loads as low as 1k Ω and still maintain ±5V outputs. This feature is especially useful when the serial port is in- tended to be used for a “self-powered” mouse. In this case the voltage necessary to operate the circuits in the mouse can be derived from the RS-232 driver output as long as the loading is ≥1kΩ (refer to Figure 4). For applications which even exceed this requirement, drivers can be connected in parallel, increasing the drive capa- bility to 750 Ω, while maintaining the ±5V V OH and V OL levels (refer to Figure 5). SD EN Power Up/Down Receiver Outputs 0 0 1 1 0 1 0 1 Up Up Down Down Enable Tri–state Enable Tri–state Figure 3. High Voltage Short Circuit Protection Figure 2. Charge Pump Voltage Inverter T IN 1 T IN T OUT T OUT 2 1 2 15V ZENER 15V ZENER S1 FROM VOLTAGE DOUBLER V+ + V- = -(V+) + S2 S3 S4 C2 C4 INTERNAL OSCILLATOR GND GND output impedance of V+ and V-, which will degrade V OH and VOL. Capacitor values can be as low as 1.0 µF. Shutdown (SD) TheSP230A, SP235A/B, SP236A/B, SP240A/ B and SP241A/B all feature a control input which will disable the part and reduce V CC current typically to less than 5 µA, which is especially useful to designers of battery–pow- ered systems. In the “power–off” mode the receiver and transmitter will both be tri-stated. V+ will discharge to V CC, and V - will discharge to ground. For complete shutdown to occur and the 10 µA current drain to be realized, the following con- ditions must be met: • +5.00V must be applied to the SD pin; • ENABLE must either 0V, +5.0V or not connected; • the transmitter inputs must be either +5.0V or not connected; • V CC must be +5V; • Receiver inputs must be >0V and <+5V Please note that for proper operation, the SD input pin must never be left floating. Table 2. Wake–Up Truth Table |
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