ISL8487E, ISL81487L, ISL81487E
Electrical Specifications Test Conditions: V = 4.5V to 5.5V; Unless Otherwise Specified.
CC
CC
Typicals are at V
= 5V, T = 25°C, (Note 2) (Continued)
A
TEMP
(°C)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNITS
Receiver Enable from Shutdown to
Output High
t
C
C
= 15pF, SW = GND, (Figure 5, Notes 7, 9)
Full
-
800
2500
ns
ZH(SHDN)
L
Receiver Enable from Shutdown to
Output Low
t
= 15pF, SW = V , (Figure 5, Notes 7, 9)
CC
Full
-
800
2500
ns
ZL(SHDN)
L
SWITCHING CHARACTERISTICS (ISL81487L)
Driver Input to Output Delay
Driver Output Skew
t
, t
PLH PHL
R
R
R
C
C
C
C
= 54Ω, C = 100pF, (Figure 2)
Full
Full
Full
Full
Full
Full
Full
Full
25
150
-
650
160
900
1000
1000
750
750
175
13
1200
600
1200
1500
1500
1500
1500
250
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kbps
ns
ns
DIFF
DIFF
DIFF
L
t
= 54Ω, C = 100pF, (Figure 2)
L
SKEW
t , t
Driver Differential Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Receiver Input to Output Delay
= 54Ω, C = 100pF, (Figure 2)
250
100
100
150
150
30
-
R
F
L
t
= 100pF, SW = GND, (Figure 3, Note 5)
ZH
L
L
L
L
t
= 100pF, SW = V , (Figure 3, Note 5)
CC
ZL
t
= 15pF, SW = GND, (Figure 3)
HZ
t
= 15pF, SW = V , (Figure 3)
CC
LZ
, t
t
(Figure 4)
(Figure 4)
PLH PHL
Receiver Skew | t
- t
PLH PHL
|
t
SKD
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
Maximum Data Rate
t
t
C
C
C
C
= 15pF, SW = GND, (Figure 5, Note 6)
Full
Full
Full
Full
Full
Full
Full
-
10
50
ZH
L
L
L
L
t
= 15pF, SW = V , (Figure 5, Note 6)
CC
-
10
50
ZL
= 15pF, SW = GND, (Figure 5)
-
10
50
HZ
t
= 15pF, SW = V , (Figure 5)
CC
-
10
50
LZ
f
250
50
-
-
-
MAX
Time to Shutdown
t
(Note 7)
140
1100
600
2000
SHDN
Driver Enable from Shutdown to
Output High
t
t
C
C
C
C
= 100pF, SW = GND, (Figure 3, Notes 7, 8)
ZH(SHDN)
L
L
L
L
Driver Enable from Shutdown to
Output Low
t
= 100pF, SW = V , (Figure 3, Notes 7, 8)
CC
Full
Full
Full
-
-
-
1000
900
2000
2000
2000
ns
ns
ns
ZL(SHDN)
Receiver Enable from Shutdown to
Output High
= 15pF, SW = GND, (Figure 5, Notes 7, 9)
ZH(SHDN)
Receiver Enable from Shutdown to
Output Low
t
= 15pF, SW = V , (Figure 5, Notes 7, 9)
CC
900
ZL(SHDN)
ESD PERFORMANCE
RS-485 Pins (A/Y, B/Z)
All Other Pins
Human Body Model
25
25
-
-
±15
>±7
-
-
kV
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 = V , and set the DE signal low time >600ns to ensure that the device enters SHDN.
CC
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.
FN6051.6
6