5
FN6074.3
SWITCHING CHARACTERISTICS (ISL4489E)
Driver Input to Output Delay t
PLH
, t
PHL
R
DIFF
= 54Ω, C
L
= 100pF (Figure 2) Full 250 400 2000 ns
Driver Output Skew t
SKEW
R
DIFF
= 54Ω, C
L
= 100pF (Figure 2) Full - 160 800 ns
Driver Differential Rise or Fall Time t
R
, t
F
R
DIFF
= 54Ω, C
L
= 100pF (Figure 2) Full 250 600 2000 ns
Driver Enable to Output High t
ZH
C
L
= 100pF, SW = GND (Figure 3) Full 250 1000 2000 ns
Driver Enable to Output Low t
ZL
C
L
= 100pF, SW = V
CC
(Figure 3) Full 250 860 2000 ns
Driver Disable from Output High t
HZ
C
L
= 15pF, SW = GND (Figure 3) Full 300 660 3000 ns
Driver Disable from Output Low t
LZ
C
L
= 15pF, SW = V
CC
(Figure 3) Full 300 640 3000 ns
Receiver Input to Output Delay t
PLH
, t
PHL
Figure 4 Full 250 500 2000 ns
Receiver Skew | t
PLH
- t
PHL
|t
SKD
Figure 4 25 - 60 - ns
Receiver Enable to Output High t
ZH
C
L
= 15pF, SW = GND (Figure 5) Full - 10 50 ns
Receiver Enable to Output Low t
ZL
C
L
= 15pF, SW = V
CC
(Figure 5) Full - 10 50 ns
Receiver Disable from Output High t
HZ
C
L
= 15pF, SW = GND (Figure 5) Full - 10 50 ns
Receiver Disable from Output Low t
LZ
C
L
= 15pF, SW = V
CC
(Figure 5) Full - 10 50 ns
Maximum Data Rate f
MAX
Full 250 - - kbps
SWITCHING CHARACTERISTICS (ISL4491E)
Driver Input to Output Delay t
PLH
, t
PHL
R
DIFF
= 54Ω, C
L
= 100pF (Figure 2) Full 13 24 40 ns
Driver Output Skew t
SKEW
R
DIFF
= 54Ω, C
L
= 100pF (Figure 2) Full - 3 10 ns
Driver Differential Rise or Fall Time t
R
, t
F
R
DIFF
= 54Ω, C
L
= 100pF (Figure 2) Full 5 12 20 ns
Driver Enable to Output High t
ZH
C
L
= 100pF, SW = GND (Figure 3) Full - 14 70 ns
Driver Enable to Output Low t
ZL
C
L
= 100pF, SW = V
CC
(Figure 3) Full - 14 70 ns
Driver Disable from Output High t
HZ
C
L
= 15pF, SW = GND (Figure 3) Full - 44 70 ns
Driver Disable from Output Low t
LZ
C
L
= 15pF, SW = V
CC
(Figure 3) Full - 21 70 ns
Receiver Input to Output Delay t
PLH
, t
PHL
(Figure 4) Full 30 90 150 ns
Receiver Skew | t
PLH
- t
PHL
|t
SKD
(Figure 4) 25 - 5 - ns
Receiver Enable to Output High t
ZH
C
L
= 15pF, SW = GND (Figure 5) Full - 9 50 ns
Receiver Enable to Output Low t
ZL
C
L
= 15pF, SW = V
CC
(Figure 5) Full - 9 50 ns
Receiver Disable from Output High t
HZ
C
L
= 15pF, SW = GND (Figure 5) Full - 9 50 ns
Receiver Disable from Output Low t
LZ
C
L
= 15pF, SW = V
CC
(Figure 5) Full - 9 50 ns
Maximum Data Rate f
MAX
Full 15 - - Mbps
ESD PERFORMANCE
RS-485 Pins (A, B, Y, Z) Human Body Model 25 - ±15 - kV
All Other Pins 25 - >±7-kV
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. 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: V
CC
= 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at V
CC
= 5V, T
A
= 25°C,
Note 2 (Continued)
PARAMETER SYMBOL TEST CONDITIONS
TEMP
(°C) MIN TYP MAX UNITS
ISL4489E, ISL4491E
