DATASHEET
ISL4489E, ISL4491E
FN6074
Rev.4.00
Sep 17, 2018
±15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed and Slew Rate
Limited, Full Duplex, RS-485/RS-422 Transceivers
The ISL4489E and ISL4491E are ESD protected, “fractional”
Unit Load (UL), BiCMOS, 5V powered, single transceivers
that meet both the RS-485 and RS-422 standards for
balanced communication. Each driver output and receiver
input is protected against ±15kV ESD strikes without
latch-up. Unlike competitive versions, these devices are
specified for 10% tolerance supplies (4.5V to 5.5V).
Features
• Pb-free (RoHS compliant)
• RS-485 I/O pin ESD protection . . . . . . . . . . . ±15kV HBM
- Class 3 ESD level on all other pins . . . . . . . >7kV HBM
• 1/8 unit load allows up to 256 devices on the bus
• High data rates (ISL4491E) . . . . . . . . . . . . up to 15Mbps
The Rx inputs and Tx outputs present a 1/8 unit load to the
RS-485 bus, which allows a total of 256 transmitters and
receivers on the network for large node count systems.
• Slew rate limited version for error free data transmission
(ISL4489E)
• Very low quiescent current:
- 140µA (ISL4489E)
- 370µA (ISL4491E)
These devices are configured for full duplex (separate Rx
input and Tx output pins) applications, so they are ideal for
RS-422 networks requiring high ESD tolerance on the bus
pins.
• -7V to +12V common-mode input voltage range
The ISL4489E uses a slew rate limited driver that reduces
EMI and minimizes reflections from improperly terminated
transmission lines, or unterminated stubs in multidrop and
multipoint applications.
• Tri-statable Rx and Tx outputs
Data rates up to 15Mbps are achievable using the
ISL4491E, which features higher slew rates.
• Current limiting and thermal shutdown for driver overload
protection
The receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are floating.
Applications
The driver (Tx) outputs are short-circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
• Security networks
Related Literature
• Level translators (for example, RS-232 to RS-422)
• Full duplex pinout
• Operates from a single +5V supply (10% tolerance)
• Factory automation
• Building environmental control systems
• Industrial/process control networks
• RS-232 “extension cords”
For a full list of related documents, visit our website:
• ISL4489E, ISL4491E product pages
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
HALF/FULL
DUPLEX
HIGH ESD?
NO. OF DEVICES
ALLOWED ON BUS
DATA RATE
(Mbps)
ISL4489E
Full
Yes
256
0.25
Yes
Yes
140
14
ISL4491E
Full
Yes
256
15
No
Yes
370
14
FN6074 Rev.4.00
Sep 17, 2018
SLEW-RATE
RECEIVER/
QUIESCENT
PIN
LIMITED?
DRIVER ENABLE?
ICC (µA)
COUNT
Page 1 of 14
ISL4489E, ISL4491E
Ordering Information
PART NUMBER
(Notes 2, 3)
PART MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(UNITS) (Note 1)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL4489EIBZ
4489EIBZ
-40 to +85
-
14 Ld SOIC
M14.15
ISL4489EIBZ-T
4489EIBZ
-40 to +85
2.5k
14 Ld SOIC
M14.15
ISL4491EIBZ
4491EIBZ
-40 to +85
-
14 Ld SOIC
M14.15
ISL4491EIBZ-T
4491EIBZ
-40 to +85
2.5k
14 Ld SOIC
M14.15
NOTES:
1. Refer to TB347 for details about reel specifications.
2. Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination
finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Pb-free products are MSL classified at
Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), see the ISL4489E and ISL4491E product information pages. For more information on MSL, see TB363.
Pinout
14 LD SOIC
TOP VIEW
14 VCC
NC 1
RO 2
R
RE 3
12 A
11 B
DE 4
DI 5
13 NC
D
10 Z
GND 6
9 Y
GND 7
8 NC
Pin Descriptions
PIN
FUNCTION
RO
Receiver output.RO is high if A > B by at least 0.2V; RO is low if A < B by 0.2V or more; RO = High if A and B are unconnected (floating).
RE
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.
DE
Driver output enable. The driver outputs Y and Z are enabled by bringing DE high. They are high impedance when DE is low.
DI
Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low.
GND
Ground connection.
A
±15kV HBM ESD protected, noninverting receiver input.
B
±15kV HBM ESD protected, inverting receiver input.
Y
±15kV HBM ESD protected, noninverting driver output.
Z
±15kV HBM ESD protected, inverting driver output.
VCC
System power supply input (4.5V to 5.5V).
NC
No connection.
FN6074 Rev.4.00
Sep 17, 2018
Page 2 of 14
ISL4489E, ISL4491E
Truth Tables
TRANSMITTING
RECEIVING
INPUTS
OUTPUTS
INPUTS
OUTPUT
RE
DE
DI
Z
Y
RE
DE
A-B
RO
X
1
1
0
1
0
X
≥ +0.2V
1
X
1
0
1
0
0
X
≤ -0.2V
0
X
0
X
High-Z
High-Z
0
X
Inputs Open
1
1
X
X
High-Z
Typical Operating Circuit
ISL4489E, ISL4491E
5V
100nF
13,14
RPU
5V
VCC
100nF
RB
RB
A 12
2 RO
3 RE
B 11
4 DE
Z 10
9 Y
10 Z
DE 4
RE 3
11 B
RT
Y 9
RPU
DI 5
RT
5 DI
GND
6,7
13,14
VCC
RO 2
12 A
GND
RB
RB
6,7
To calculate the resistor values, refer to TB509
FN6074 Rev.4.00
Sep 17, 2018
Page 3 of 14
ISL4489E, ISL4491E
Absolute Maximum Ratings
Thermal Information
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V)
Input/Output Voltages
A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V)
Short-Circuit Duration
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . See “ESD PERFORMANCE” on page 5
Thermal Resistance (Typical, Note 4)
JA (°C/W)
14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
128
Maximum Junction Temperature (Plastic Package) . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . +300°C
(Lead Tips Only)
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” can permanently damage the device. This is a stress only rating and operation of the device at
these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
4. JA is measured with the component mounted on a low-effective thermal conductivity test board in free air. See TB379 for details.
Electrical Specifications
Note 5
PARAMETER
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = +25°C,
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
MAX
UNIT
Full
-
-
VCC
V
DC CHARACTERISTICS
Driver Differential VOUT (no load)
VOD1
Driver Differential VOUT (with load)
VOD2
Change in Magnitude of Driver
Differential VOUT for
Complementary Output States
Driver Common-Mode VOUT
Change in Magnitude of Driver
Common-Mode VOUT for
Complementary Output States
R = 50Ω (RS-422) (Figure 1)
Full
2
3
-
V
R = 27Ω (RS-485) (Figure 1)
Full
1.5
2.3
5
V
VOD
R = 27Ω or 50Ω (Figure 1)
Full
-
0.01
0.2
V
VOC
R = 27Ω or 50Ω (Figure 1)
Full
-
-
3
V
VOC
R = 27Ω or 50Ω (Figure 1)
Full
-
0.01
0.2
V
Logic Input High Voltage
VIH
DE, DI, RE
Full
2
-
-
V
Logic Input Low Voltage
VIL
DE, DI, RE
Full
0.8
-
-
V
Logic Input Current
IIN1
DI
Full
-2
-
2
µA
Input Current (A, B) (Note 8)
IIN2
Full
-40
-
40
µA
VIN = 12V
Full
-
-
130
µA
VIN = -7V
Full
-100
-
-
µA
DE, RE
DE = 0V, VCC = 0V or
4.5 to 5.5V
Driver Tri-State (High Impedance)
Output Current (Y, Z)
IOZD
-7V ≤ VO ≤ 12V
Full
-100
-
100
µA
Receiver Differential Threshold
Voltage
VTH
-7V ≤ VCM ≤ 12V
Full
-0.2
-
0.2
V
Receiver Input Hysteresis
VTH
VCM = 0V
+25
-
70
-
mV
Receiver Output High Voltage
VOH
IO = -4mA, VID = 200mV
Full
3.5
-
-
V
Receiver Output Low Voltage
VOL
IO = -4mA, VID = 200mV
Full
-
-
0.4
V
Tri-State (high impedance)
Receiver Output Current
IOZR
0.4V ≤ VO ≤ 2.4V
Full
-
-
±1
µA
Receiver Input Resistance
RIN
-7V ≤ VCM ≤ 12V
Full
92
120
-
kΩ
No-Load Supply Current (Note 6)
ICC
ISL4489E, DE, DI, RE = 0V or VCC
Full
-
140
190
µA
ISL4491E, DE, DI, RE = 0V or VCC
Full
-
370
460
µA
Driver Short-Circuit Current,
VO = High or Low
IOSD1
DE = VCC, -7V ≤ VY or VZ ≤ 12V (Note 7)
Full
35
-
250
mA
Receiver Short-Circuit Current
IOSR
0V ≤ VO ≤ VCC
Full
7
-
85
mA
FN6074 Rev.4.00
Sep 17, 2018
Page 4 of 14
ISL4489E, ISL4491E
Electrical Specifications
Note 5 (Continued)
PARAMETER
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = +25°C,
TEMP
(°C)
MIN
TYP
MAX
UNIT
tPLH, tPHL RDIFF = 54Ω, CL = 100pF (Figure 2)
Full
250
400
2000
ns
tSKEW
RDIFF = 54Ω, CL = 100pF (Figure 2)
Full
-
160
800
ns
tR, tF
RDIFF = 54Ω, CL = 100pF (Figure 2)
Full
250
600
2000
ns
SYMBOL
TEST CONDITIONS
SWITCHING CHARACTERISTICS (ISL4489E)
Driver Input to Output Delay
Driver Output Skew
Driver Differential Rise or Fall Time
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 3)
Full
250
1000
2000
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 3)
Full
250
860
2000
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 3)
Full
300
660
3000
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 3)
Full
300
640
3000
ns
Receiver Input to Output Delay
Receiver Skew | tPLH - tPHL |
tPLH, tPHL Figure 4
tSKD
Full
250
500
2000
ns
Figure 4
+25
-
60
-
ns
Receiver Enable to Output High
tZH
CL = 15pF, SW = GND (Figure 5)
Full
-
10
50
ns
Receiver Enable to Output Low
tZL
CL = 15pF, SW = VCC (Figure 5)
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
Full
250
-
-
kbps
tPLH, tPHL RDIFF = 54Ω, CL = 100pF (Figure 2)
Full
13
24
40
ns
tSKEW
RDIFF = 54Ω, CL = 100pF (Figure 2)
Full
-
3
10
ns
tR, tF
RDIFF = 54Ω, CL = 100pF (Figure 2)
Full
5
12
20
ns
Maximum Data Rate
fMAX
SWITCHING CHARACTERISTICS (ISL4491E)
Driver Input to Output Delay
Driver Output Skew
Driver Differential Rise or Fall Time
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 3)
Full
-
14
70
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 3)
Full
-
14
70
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 3)
Full
-
44
70
ns
tLZ
CL = 15pF, SW = VCC (Figure 3)
Driver Disable from Output Low
Receiver Input to Output Delay
Receiver Skew | tPLH - tPHL |
Receiver Enable to Output High
Full
-
21
70
ns
Full
30
90
150
ns
(Figure 4)
+25
-
5
-
ns
tZH
CL = 15pF, SW = GND (Figure 5)
Full
-
9
50
ns
tPLH, tPHL (Figure 4)
tSKD
Receiver Enable to Output Low
tZL
CL = 15pF, SW = VCC (Figure 5)
Full
-
9
50
ns
Receiver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 5)
Full
-
9
50
ns
Receiver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 5)
Full
-
9
50
ns
Full
15
-
-
Mbps
+25
-
±15
-
kV
+25
-
>±7
-
kV
Maximum Data Rate
fMAX
ESD PERFORMANCE
RS-485 Pins (A, B, Y, Z)
Human Body Model
All Other Pins
NOTES:
5. 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.
6. Supply current specification is valid for loaded drivers when DE = 0V.
7. Applies to peak current. See “Typical Performance Curves” on page 9 for more information.
8. Devices meeting these limits are denoted as “1/8 unit load (1/8 UL)” transceivers. The RS-485 standard allows up to 32 UL on the bus, so there
can be 256 1/8 UL devices on a bus.
FN6074 Rev.4.00
Sep 17, 2018
Page 5 of 14
ISL4489E, ISL4491E
Test Circuits and Waveforms
R
VCC
DE
Z
DI
VOD
D
Y
VOC
R
FIGURE 1. DRIVER VOD AND VOC
3V
DI
1.5V
1.5V
0V
tPLH
VCC
tPHL
VOH
CL = 100pF
DE
50%
OUT (Y)
50%
VOL
Z
DI
RDIFF
D
Y
VOH
OUT (Z)
SIGNAL
GENERATOR
tPLH
tPHL
CL = 100pF
50%
50%
VOL
90%
DIFF OUT (Y - Z)
10%
tR
+VOD
90%
10%
-VOD
tF
SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FN6074 Rev.4.00
Sep 17, 2018
Page 6 of 14
ISL4489E, ISL4491E
Test Circuits and Waveforms (Continued)
DE
Z
DI
500Ω
D
SIGNAL
GENERATOR
3V
VCC
SW
Y
DE
1.5V
1.5V
GND
0V
CL
tZH
OUTPUT HIGH
OUT (Y, Z)
PARAMETER OUTPUT
RE
DI
SW
CL (pF)
tHZ
Y/Z
X
1/0
GND
15
tLZ
Y/Z
X
0/1
VCC
15
tZH
Y/Z
GND
100
X
Y/Z
tZL
1/0
X
0/1
VCC
tHZ
VOH - 0.5V VOH
2.3V
0V
tZL
tLZ
VCC
OUT (Y, Z)
2.3V
OUTPUT LOW
100
FIGURE 3A. TEST CIRCUIT
VOL + 0.5V V
OL
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
RE
+1.5V
3V
15pF
B
R
A
A
1.5V
RO
1.5V
0V
tPLH
tPHL
VCC
SIGNAL
GENERATOR
50%
RO
50%
0V
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4A. TEST CIRCUIT
FIGURE 4. RECEIVER PROPAGATION DELAY
RE
3V
B
R
SIGNAL
GENERATOR
1kΩ
RO
VCC
SW
A
RE
1.5V
0V
GND
tZH
15pF
OUTPUT HIGH
RO
PARAMETER
DE
A
SW
tHZ
X
+1.5V
GND
tLZ
X
-1.5V
VCC
tZH
X
+1.5V
GND
tZL
X
-1.5V
VCC
FIGURE 5A. TEST CIRCUIT
1.5V
tHZ
VOH - 0.5V VOH
1.5V
0V
tZL
tLZ
VCC
RO
1.5V
OUTPUT LOW
VOL + 0.5V V
OL
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES
FN6074 Rev.4.00
Sep 17, 2018
Page 7 of 14
ISL4489E, ISL4491E
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
transceivers are also RS-422 compliant. RS-422 is a
point-to-multipoint (multidrop) standard that allows only one
driver and up to 10 receivers on each bus, assuming one
unit load devices. RS-485 is a true multipoint standard,
which allows up to 32 one unit load devices (any
combination of drivers and receivers) on each bus. To allow
for multipoint operation, the RS-485 specification requires
that drivers must handle bus contention without sustaining
any damage.
An important advantage of RS-485 is the extended
Common-Mode Range (CMR), which specifies that the
driver outputs and receiver inputs withstand signals that
range from +12V to -7V. RS-422 and RS-485 are intended
for runs as long as 4000ft, so the wide CMR is necessary to
handle ground potential differences and voltages induced in
the cable by external fields.
Receiver Features
These devices use a differential input receiver for maximum
noise immunity and common-mode rejection. Input
sensitivity is ±200mV as required by the RS-422 and RS-485
specifications.
The receiver input resistance of 120kΩ surpasses the
RS-422 specification of 4kΩ, and is more than eight times
the RS-485 “UL” requirement of 12kΩ. Thus, these products
are known as “one-eighth UL” transceivers. There can be up
to 256 of these devices on a network while still complying
with the RS-485 loading specification.
Receiver inputs function with common-mode voltages as
great as ±7V outside the power supplies (such as +12V and
-7V), making them ideal for long networks in which induced
voltages are a realistic concern.
All the receivers include a “fail-safe if open” function that
ensures a high level receiver output if the receiver inputs are
unconnected (floating).
Receivers easily meet the data rate supported by the
corresponding driver, and the receiver outputs are
tri-statable using the active low RE input.
Driver Features
The RS-485/422 driver is a differential output device that
delivers at least 1.5V across a 54Ω load (RS-485) and at
least 2V across a 100Ω load (RS-422). The drivers feature
low propagation delay skew to maximize bit width and to
minimize EMI. The driver outputs are tri-statable using the
active high DE input.
rate limited versions are a maximum of 250kbps. The
ISL4491E driver outputs are not limited, so faster output
transition times allow data rates of at least 15Mbps.
Data Rate, Cables, and Terminations
Twisted pair cable is the cable of choice for RS-485/422
networks. Twisted pair cables tend to pick up noise and
other electromagnetically induced voltages as
common-mode signals, which are effectively rejected by the
differential receivers in these ICs.
RS-485/422 are intended for network lengths up to 4000ft,
but the maximum system data rate decreases as the
transmission length increases. Devices operating at 15Mbps
are limited to lengths of a few hundred feet, while the
250kbps versions can operate at full data rates with lengths
in excess of 1000ft.
Proper termination is imperative to minimize reflections
when using the 15Mbps devices. Short networks using the
250kbps versions do not need to be terminated, but
terminations are recommended unless power dissipation is
an overriding concern. In point-to-point or point-to-multipoint
(single driver on bus) networks, terminate the main cable in
its characteristic impedance (typically 120Ω) at the end
farthest from the driver. In multi-receiver applications, keep
stubs connecting receivers to the main cable as short as
possible. In multipoint (multi-driver) systems, terminate the
main cable in its characteristic impedance at both ends.
Keep stubs connecting a transceiver to the main cable as
short as possible.
Built-In Driver Overload Protection
As stated previously, the RS-485 specification requires that
drivers survive worst case bus contentions undamaged. The
ISL44xxE devices meet this requirement through driver
output short-circuit current limits and on-chip thermal
shutdown circuitry.
The driver output stages incorporate short-circuit current
limiting circuitry which ensures that the output current never
exceeds the RS-485 specification, even at the
common-mode voltage range extremes. Additionally, these
devices use a foldback circuit that reduces the short-circuit
current, and thus the power dissipation, when the
contending voltage exceeds either supply.
In the event of a major short-circuit condition, the ISL44xxE
devices’ thermal shutdown feature disables the drivers when
the die temperature becomes excessive. This eliminates the
power dissipation, allowing the die to cool. The drivers
automatically reenable after the die temperature drops about
15°C. If the contention persists, the thermal
shutdown/reenable cycle repeats until the fault is cleared.
Receivers stay operational during thermal shutdown.
The ISL4489E driver outputs are slew rate limited to further
reduce EMI and to minimize reflections in unterminated or
improperly terminated networks. Data rates on these slew
FN6074 Rev.4.00
Sep 17, 2018
Page 8 of 14
ISL4489E, ISL4491E
ESD Protection
All pins on these devices include Class 3 Human Body
Model (HBM) ESD protection structures, but the RS-485
pins (driver outputs and receiver inputs) incorporate
advanced structures allowing them to survive ESD events
in excess of ±15kV HBM. The RS-485 pins are particularly
vulnerable to ESD damage because they typically connect
to an exposed port on the exterior of the finished product.
Simply touching the port pins or connecting a cable can
VCC = 5V, TA = 25°C; Unless Otherwise Specified
90
3.6
80
3.4
DIFFERENTIAL OUTPUT VOLTAGE (V)
DRIVER OUTPUT CURRENT (mA)
Typical Performance Curves
cause an ESD event that might destroy unprotected ICs.
The ESD structures protect the device whether or not it is
powered up, protect without allowing any latchup
mechanism to activate, and without degrading the RS-485
common-mode range of -7V to +12V. This built-in ESD
protection eliminates the need for board level protection
structures (for example, transient suppression diodes), and
the associated undesirable capacitive load they present.
70
60
50
40
30
20
10
0
0
1
2
3
4
3.2
RDIFF = 100Ω
3
2.8
2.6
2.4
RDIFF = 54Ω
2.2
2
-40
5
-25
DIFFERENTIAL OUTPUT VOLTAGE (V)
50
25
75
FIGURE 6. DRIVER OUTPUT CURRENT vs DIFFERENTIAL
OUTPUT VOLTAGE
FIGURE 7. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
160
400
140
ISL4491E
120
350
Y OR Z = LOW
100
80
85
ISL4491E, DE = X, RE = X
300
ISL4489E
60
40
250
ICC (µA)
OUTPUT CURRENT (mA)
0
TEMPERATURE (°C)
20
0
-20
Y OR Z = HIGH
-40
-60
-7 -6
-4
ISL4489E, DE = X, RE = X
150
ISL4491E
-80 ISL4489E
-100
-120
200
100
-2
0
2
4
6
OUTPUT VOLTAGE (V)
8
10
12
FIGURE 8. DRIVER OUTPUT CURRENT vs SHORT-CIRCUIT
VOLTAGE
FN6074 Rev.4.00
Sep 17, 2018
50
-40
-25
0
25
TEMPERATURE (°C)
50
75
FIGURE 9. SUPPLY CURRENT vs TEMPERATURE
Page 9 of 14
85
ISL4489E, ISL4491E
Typical Performance Curves
VCC = 5V, TA = 25°C; Unless Otherwise Specified (Continued)
750
250
200
tPLHY
tPLHZ
650
|tPLHY - tPHLZ|
150
600
SKEW (ns)
tPHLY
550
tPHLZ
|tPHLY - tPLHZ|
100
50
500
|CROSS PT. OF Y & Z - CROSS PT. OF Y & Z|
450
-40
-25
0
25
TEMPERATURE (°C)
50
0
-40
85
75
FIGURE 10. DRIVER PROPAGATION DELAY vs
TEMPERATURE (ISL4489E)
85
75
4
|tPHLY - tPLHZ|
26
tPLHY
22
tPHLZ
tPLHZ
20
3
SKEW (ns)
24
|tPLHY - tPHLZ|
2
1
18
|CROSSING PT. OF Y & Z - CROSSING PT. OF Y & Z|
tPHLY
16
-40
-25
0
25
50
0
-40
85
75
-25
TEMPERATURE (°C)
5
0
5
RO
0
3
2
DRIVER OUTPUT (V)
4
Z
Y
1
0
TIME (400ns/DIV)
FIGURE 14. DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (ISL4489E)
FN6074 Rev.4.00
Sep 17, 2018
RECEIVER OUTPUT (V)
DI
50
25
85
75
FIGURE 13. DRIVER SKEW vs TEMPERATURE
(ISL4491E)
DRIVER INPUT (V)
RDIFF = 54Ω, CL = 100pF
0
TEMPERATURE (°C)
FIGURE 12. DRIVER PROPAGATION DELAY vs
TEMPERATURE (ISL4491E)
RECEIVER OUTPUT (V)
50
5
28
DRIVER OUTPUT (V)
0
25
TEMPERATURE (°C)
FIGURE 11. DRIVER SKEW vs TEMPERATURE (ISL4489E)
30
PROPAGATION DELAY (ns)
-25
RDIFF = 54Ω, CL = 100pF
5
DI
0
5
RO
0
4
3
2
Y
Z
1
0
TIME (400ns/DIV)
FIGURE 15. DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (ISL4489E)
Page 10 of 14
DRIVER INPUT (V)
PROPAGATION DELAY (ns)
700
ISL4489E, ISL4491E
5
0
5
RO
0
4
3
2
Z
Y
1
0
TIME (20ns/DIV)
FIGURE 16. DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (ISL4491E)
RDIFF = 54Ω, CL = 100pF
DI
0
5
RO
0
4
3
2
Y
Z
1
0
TIME (20ns/DIV)
FIGURE 17. DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (ISL4491E)
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP):
GND
TRANSISTOR COUNT:
518
PROCESS:
Si Gate BiCMOS
FN6074 Rev.4.00
Sep 17, 2018
5
Page 11 of 14
DRIVER INPUT (V)
DI
RECEIVER OUTPUT (V)
RDIFF = 54Ω, CL = 100pF
DRIVER INPUT (V)
VCC = 5V, TA = 25°C; Unless Otherwise Specified (Continued)
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
RECEIVER OUTPUT (V)
Typical Performance Curves
ISL4489E, ISL4491E
Revision History The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please visit our website to make sure you have the latest revision.
DATE
REVISION
CHANGE
Sep 14, 2018
FN6074.4
Added Related Literature section.
Updated first features bullet.
Updated Ordering Information table by removing retired parts, adding Notes 1 and 3, added tape and
reel parts and column.
Updated the Typical Operating Circuit diagram on page 3.
Added Revision History section.
Updated POD M14.15 to the latest revision. Changes are as follows:
- Add land pattern and moved dimensions from table onto drawing
FN6074 Rev.4.00
Sep 17, 2018
Page 12 of 14
ISL4489E, ISL4491E
Package Outline Drawing
For the most recent package outline drawing, see M14.15.
M14.15
14 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
Rev 1, 10/09
8.65
A 3
4
0.10 C A-B 2X
6
14
DETAIL"A"
8
0.22±0.03
D
6.0
3.9
4
0.10 C D 2X
0.20 C 2X
7
PIN NO.1
ID MARK
5
0.31-0.51
B 3
(0.35) x 45°
4° ± 4°
6
0.25 M C A-B D
TOP VIEW
0.10 C
1.75 MAX
H
1.25 MIN
0.25
GAUGE PLANE C
SEATING PLANE
0.10 C
0.10-0.25
1.27
SIDE VIEW
(1.27)
DETAIL "A"
(0.6)
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSEY14.5m-1994.
3. Datums A and B to be determined at Datum H.
(5.40)
4. Dimension does not include interlead flash or protrusions.
Interlead flash or protrusions shall not exceed 0.25mm per side.
5. The pin #1 indentifier may be either a mold or mark feature.
(1.50)
6. Does not include dambar protrusion. Allowable dambar protrusion
shall be 0.10mm total in excess of lead width at maximum condition.
7. Reference to JEDEC MS-012-AB.
TYPICAL RECOMMENDED LAND PATTERN
FN6074 Rev.4.00
Sep 17, 2018
Page 13 of 14
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