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ISL8485 Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL8485 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 16 page 7 FN6046.8 February 28, 2006 Receiver Disable from Output Low tLZ CL = 15pF, SW = VCC, Figure 5 Full - 10 50 ns Maximum Data Rate fMAX Note 11 Full 250 - - kbps Time to Shutdown (ISL8483 only) tSHDN Note 7 Full 50 200 600 ns Driver Enable from Shutdown to Output High (ISL8483 only) tZH(SHDN) CL = 100pF, SW = GND, Figure 3, Notes 7, 8 Full - - 2000 ns Driver Enable from Shutdown to Output Low (ISL8483 only) tZL(SHDN) CL = 100pF, SW = VCC, Figure 3, Notes 7, 8 Full - - 2000 ns Receiver Enable from Shutdown to Output High (ISL8483 only) tZH(SHDN) CL = 15pF, SW = GND, Figure 5, Notes 7, 9 Full - - 2500 ns Receiver Enable from Shutdown to Output Low (ISL8483 only) tZL(SHDN) CL = 15pF, SW = VCC, Figure 5, Notes 7, 9 Full - - 2500 ns NOTES: 2. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. 3. Supply current specification is valid for loaded drivers when DE = 0V. 4. Applies to peak current. See “Typical Performance Curves” for more information. 5. When testing the ISL8483, keep RE = 0 to prevent the device from entering SHDN. 6. When testing the ISL8483, the RE signal high time must be short enough (typically <200ns) to prevent the device from entering SHDN. 7. The ISL8483 is put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are guaranteed to have entered shutdown. See “Low-Power Shutdown Mode” section. 8. Keep RE = VCC, and set the DE signal low time >600ns to ensure that the device enters SHDN. 9. Set the RE signal high time >600ns to ensure that the device enters SHDN. 10. Devices meeting these limits are denoted as “single unit load (1 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus. 11. Guaranteed by characterization, but not tested. Test Circuits and Waveforms FIGURE 1. DRIVER VOD AND VOC Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25°C, Note 2 (Continued) PARAMETER SYMBOL TEST CONDITIONS TEMP (°C) MIN TYP MAX UNITS D DE DI VCC VOD VOC R R Z Y ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491 |
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