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ISL8487E Datasheet(PDF) 6 Page - Renesas Technology Corp |
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ISL8487E Datasheet(HTML) 6 Page - Renesas Technology Corp |
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6 / 14 page  ISL8487E, ISL81487L, ISL81487E FN6051 Rev.7.00 Page 6 of 14 February 27, 2006 Receiver Enable from Shutdown to Output High tZH(SHDN) CL = 15pF, SW = GND, (Figure 5, Notes 7, 9) Full - 800 2500 ns Receiver Enable from Shutdown to Output Low tZL(SHDN) CL = 15pF, SW = VCC, (Figure 5, Notes 7, 9) Full - 800 2500 ns SWITCHING CHARACTERISTICS (ISL81487L) Driver Input to Output Delay tPLH, tPHL RDIFF = 54, CL = 100pF, (Figure 2) Full 150 650 1200 ns Driver Output Skew tSKEW RDIFF = 54, CL = 100pF, (Figure 2) Full - 160 600 ns Driver Differential Rise or Fall Time tR, tF RDIFF = 54, CL = 100pF, (Figure 2) Full 250 900 1200 ns Driver Enable to Output High tZH CL = 100pF, SW = GND, (Figure 3, Note 5) Full 100 1000 1500 ns Driver Enable to Output Low tZL CL = 100pF, SW = VCC, (Figure 3, Note 5) Full 100 1000 1500 ns Driver Disable from Output High tHZ CL = 15pF, SW = GND, (Figure 3) Full 150 750 1500 ns Driver Disable from Output Low tLZ CL = 15pF, SW = VCC, (Figure 3) Full 150 750 1500 ns Receiver Input to Output Delay tPLH, tPHL (Figure 4) Full 30 175 250 ns Receiver Skew | tPLH - tPHL | tSKD (Figure 4) 25 - 13 - ns Receiver Enable to Output High tZH CL = 15pF, SW = GND, (Figure 5, Note 6) Full - 10 50 ns Receiver Enable to Output Low tZL CL = 15pF, SW = VCC, (Figure 5, Note 6) Full - 10 50 ns Receiver Disable from Output High tHZ CL = 15pF, SW = GND, (Figure 5) Full - 10 50 ns Receiver Disable from Output Low tLZ CL = 15pF, SW = VCC, (Figure 5) Full - 10 50 ns Maximum Data Rate fMAX Full 250 - - kbps Time to Shutdown tSHDN (Note 7) Full 50 140 600 ns Driver Enable from Shutdown to Output High tZH(SHDN) CL = 100pF, SW = GND, (Figure 3, Notes 7, 8) Full - 1100 2000 ns Driver Enable from Shutdown to Output Low tZL(SHDN) CL = 100pF, SW = VCC, (Figure 3, Notes 7, 8) Full - 1000 2000 ns Receiver Enable from Shutdown to Output High tZH(SHDN) CL = 15pF, SW = GND, (Figure 5, Notes 7, 9) Full - 900 2000 ns Receiver Enable from Shutdown to Output Low tZL(SHDN) CL = 15pF, SW = VCC, (Figure 5, Notes 7, 9) Full - 900 2000 ns ESD PERFORMANCE RS-485 Pins (A/Y, B/Z) Human Body Model 25 - 15 - kV All Other Pins 25 - > 7- kV NOTES: 2. Currents into device pins are positive; currents out of device pins are negative. Voltages are referenced to 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 ISL8487E and ISL81487L, keep RE = 0 to prevent the device from entering SHDN. 6. When testing the ISL8487E and ISL81487L, the RE signal high time must be short enough (typically <200ns) to prevent the device from entering SHDN. 7. The ISL8487E and ISL81487L are 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 “1/8 unit load (1/8 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus, so there can be 256 1/8 UL devices on a bus. 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 |
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