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ISL8488 View Datasheet(PDF) - Intersil

Part Name
Description
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ISL8488 Datasheet PDF : 16 Pages
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ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491
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
Receiver Disable from Output Low
tLZ
CL = 15pF, SW = VCC, Figure 5
Maximum Data Rate
fMAX Note 11
Time to Shutdown (ISL8483 only) tSHDN Note 7
Driver Enable from Shutdown to
Output High (ISL8483 only)
tZH(SHDN) CL = 100pF, SW = GND, Figure 3, Notes 7, 8
Full
-
Full 250
Full 50
Full
-
10
50
ns
-
-
kbps
200 600 ns
-
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 tZH(SHDN) CL = 15pF, SW = GND, Figure 5, Notes 7, 9
Output High (ISL8483 only)
Full
-
-
2500 ns
Receiver Enable from Shutdown to tZL(SHDN) CL = 15pF, SW = VCC, Figure 5, Notes 7, 9
Output Low (ISL8483 only)
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
VCC DE
DI
Z
D
Y
R
VOD
R
VOC
FIGURE 1. DRIVER VOD AND VOC
7
FN6046.8
February 28, 2006
 

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