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HCPL-0300 Datasheet(PDF) 9 Page - Agilent(Hewlett-Packard) |
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HCPL-0300 Datasheet(HTML) 9 Page - Agilent(Hewlett-Packard) |
9 / 12 page 9 Applications The HCPL-2300/HCPL-0300 optocoupler has the unique combination of low 0.5 mA LED operating drive current at a 5 MBd speed performance. Low power supply current requirement of 10 mA maximum at 5.25 V and the ability to provide isolation between logic systems fulfills numerous applications ranging from logic level translations, line receiver and party line receiver applications, microprocessor I/O port isolation, etc. The open col- lector output allows for wired-OR arrangement. Specific interface circuits are illustrated in Figures 12-16, and 18 with correspond- ing component values, perform- ance data and recommended layout in Figures 17 and 19. For -40 °C to 85°C operating temperature range, a mid-range LED forward current (IF) of 0.625 mA is recommended in order to prevent overdriving the integrated circuit detector due to increased LED efficiency at temperatures between 0 °C and -40 °C. For narrower temperature range of 0 °C to 85°C, a suggested operating LED current of 0.75 mA is recommended for the mid-range operating point and for minimal propagation delay skew. A peaking capacitance of 20 pF in parallel with the current limiting resistor for the LED shortens tPHL by approximately 33% and tPLH by 13%. Maintain- ing LED forward voltage (VF) below 0.8 V will guarantee that the HCPL-2300/HCPL-0300 output is off. The recommended shunt drive technique for TTL/LSTTL/CMOS of Figure 12 provides for optimal speed performance, no leakage current path through the LED, and reduced common mode influences associated with series switching of a “floating” LED. Alternate series drive techniques with either an active CMOS inverter or an open collector TTL/ LSTTL inverter are illustrated in Figures 13 and 14 respectively. Open collector leakage current of 250 µA has been compensated by the 3.16 K Ω resistor (Figure 14) at the expense of twice the operating forward current. An application of the HCPL-2300/ HCPL-0300 as an unbalanced line receiver for use in long line twisted wire pair communication links is shown in Figure 15. Low LED IF and VF allow longer line length, higher speed and multiple stations on the line in comparison to higher IF, VF optocouplers. Greater speed performance along with nearly infinite common mode immunity are achieved via the balanced split phase circuit of Figure 16. Basic balanced differential line receiver can be accomplished with one HCPL-2300/HCPL-0300 in Figure 16, but with a typical 400 V/ µs common mode immunity. Data rate versus distance for both the above unbalanced and balanced line receiver applications are com- pared in Figure 17. The RS-232-C interface circuit of Figure 18 Figure 10. Test Circuit for Common Mode Transient Immunity and Typical Waveforms. Figure 11. Thermal Derating Curve, Dependence of Safety Limiting Value with Case Temperature per IEC/EN/ DIN EN 60747-5-2. 0 0 TS – CASE TEMPERATURE – °C 200 50 400 125 25 75 100 150 600 800 200 100 300 500 700 PS (mW) IS (mA) 175 HCPL-0300/ HCPL-2300 |
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