DATASHEET
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
FN7920
Rev.1.00
Feb 15, 2019
±40V Fault Protected, 3.3V to 5V, ±15V Common-Mode Range, RS-485/RS-422
Transceivers With Cable Invert and ±15kV ESD
The ISL32430E, ISL32432E, ISL32433E, ISL32435E, and
ISL32437E are 3.3V to 5V powered, fault protected, extended
common-mode range differential transceivers for balanced
communication. The RS-485 bus pins, driver outputs and
receiver inputs, are protected against overvoltages up to ±40V
and against ±15kV ESD strikes. Additionally, these transceivers
operate in environments with common-mode voltages up to
±15V (exceeds the RS-485 requirement), making this RS-485
family one of the most robust on the market.
The transmitters are RS-485 compliant with VCC ≥ 4.5V and
deliver a 1.1V differential output voltage into the RS-485
specified 54Ω load even with VCC = 3V.
Features
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±40V
• Extended common-mode range. . . . . . . . . . . . . . . . . . . . ±15V
larger than required for RS-485
• ±15kV HBM ESD protection on RS-485 bus pins
• Wide supply range . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 5.5V
• Cable invert pin corrects for reversed cable connections
while maintaining Rx full fail-safe functionality (ISL32437E
only)
• 1/4 Unit load for up to 128 devices on the bus
The receiver (Rx) inputs feature a full fail-safe design that
ensures a logic high Rx output if the Rx inputs are floating,
shorted, or on a terminated but undriven (idle) bus. The Rx full
fail-safe operation is maintained even when the Rx input polarity
is switched (cable invert function on ISL32437E).
• High transient overvoltage tolerance. . . . . . . . . . . . . . . . ±60V
The ISL32437E includes a cable invert function that reverses
the polarity of the Rx and Tx bus pins if the cable is
misconnected during installation.
• Ultra low shutdown supply current. . . . . . . . . . . . . . . . . . 10µA
See Table 1 on page 4 for key features and configurations by
device number.
• Full fail-safe (open, short, terminated) RS-485 receivers
• Choice of RS-485 data rates . . . . . . . . . . . . . 250kbps or 1Mbps
• Low quiescent supply current. . . . . . . . . . . . . . . . . . . . 2.1mA
• Pb-free (RoHS compliant)
Applications
• Utility meters/automated meter reading systems
• Air conditioning systems
Related Literature
• Security camera networks
For a full list of related documents, visit our website:
• ISL32430E, ISL32432E, ISL32433E, ISL32435E, and
ISL32437E device pages
• Building lighting and environmental control systems
• Industrial/process control networks
20
VOLTAGE (V)
15
B
VID = ±1V
2Mbps
10
5
RO
0
15
COMMON-MODE RANGE (V)
VCC = 3V
A
12
0
-7
-15
TIME (200ns/DIV)
FIGURE 1. EXCEPTIONAL ISL32433E RX OPERATES AT >1Mbps
EVEN WITH ±15V COMMON-MODE VOLTAGE
FN7920 Rev.1.00
Feb 15, 2019
STANDARD RS-485
TRANSCEIVER
ISL3243XE
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON-MODE
RANGE vs STANDARD RS-485 DEVICES
Page 1 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Typical Operating Circuits
+3.3V
+3.3V
+
14
VCC
2 RO
0.1µF
14
9 Y VCC
RT
A 12
R
0.1µF
+
10 Z
B 11
D
DI 5
3 RE
DE 4
4 DE
RE 3
5 DI
RT
Z 10
11 B
Y 9
D
GND
6, 7
RO 2
R
12 A
GND
6, 7
SOIC PINOUT SHOWN
FIGURE 3. ISL32430E, ISL32433E FULL DUPLEX NETWORK
+3.3V
+3.3V
+
8
0.1µF
VCC
1 RO
8
VCC
R
D
2 RE
B/Z
7
3 DE
A/Y
6
4 DI
0.1µF
+
RT
RT
DI 4
7
B/Z
DE 3
6
A/Y
RE 2
RO 1
R
D
GND
5
GND
5
FIGURE 4. ISL32432E, ISL32435E HALF DUPLEX NETWORK
+3.3V
+3.3V
+
8
0.1µF
0.1µF
+
8
VCC
VCC
2
INV
1 RO
R
A/Y
6
B/Z
7
RT
RT
7
B/Z
6
A/Y
RO 1
R
DE 3
3 DE
4 DI
D
D
GND
5
THE IC ON THE LEFT HAS THE CABLE CONNECTIONS
SWAPPED, SO THE INV PIN IS STRAPPED HIGH TO
INVERT THE RX AND TX POLARITY
GND
DI 4
INV
2
5
FIGURE 5. ISL32437E HALF DUPLEX NETWORK USING CABLE INVERT FUNCTION
FN7920 Rev.1.00
Feb 15, 2019
Page 2 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Ordering Information
PART NUMBER
(Notes 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(Units) (Note 1)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL32430EIBZ
ISL32430 EIBZ
-40 to +85
-
14 Ld SOIC
M14.15
ISL32430EIBZ-T
ISL32430 EIBZ
-40 to +85
2.5k
14 Ld SOIC
M14.15
ISL32430EIBZ-T7A
ISL32430 EIBZ
-40 to +85
250
14 Ld SOIC
M14.15
ISL32430EIUZ
2430E
-40 to +85
-
10 Ld MSOP
M10.118
ISL32430EIUZ-T
2430E
-40 to +85
2.5k
10 Ld MSOP
M10.118
ISL32430EIUZ-T7A
2430E
-40 to +85
250
10 Ld MSOP
M10.118
ISL32432EIBZ
32432 EIBZ
-40 to +85
-
8 Ld SOIC
M8.15
ISL32432EIBZ-T
32432 EIBZ
-40 to +85
2.5k
8 Ld SOIC
M8.15
ISL32432EIBZ-T7A
32432 EIBZ
-40 to +85
250
8 Ld SOIC
M8.15
ISL32432EIUZ
2432E
-40 to +85
-
8 Ld MSOP
M8.118
ISL32432EIUZ-T
2432E
-40 to +85
2.5k
8 Ld MSOP
M8.118
ISL32432EIUZ-T7A
2432E
-40 to +85
250
8 Ld MSOP
M8.118
ISL32433EIBZ
ISL32433 EIBZ
-40 to +85
-
14 Ld SOIC
M14.15
ISL32433EIBZ-T
ISL32433 EIBZ
-40 to +85
2.5k
14 Ld SOIC
M14.15
ISL32433EIBZ-T7A
ISL32433 EIBZ
-40 to +85
250
14 Ld SOIC
M14.15
ISL32433EIUZ
2433E
-40 to +85
-
10 Ld MSOP
M10.118
ISL32433EIUZ-T
2433E
-40 to +85
2.5k
10 Ld MSOP
M10.118
ISL32433EIUZ-T7A
2433E
-40 to +85
250
10 Ld MSOP
M10.118
ISL32435EIBZ
32435 EIBZ
-40 to +85
-
8 Ld SOIC
M8.15
ISL32435EIBZ-T
32435 EIBZ
-40 to +85
2.5k
8 Ld SOIC
M8.15
ISL32435EIBZ-T7A
32435 EIBZ
-40 to +85
250
8 Ld SOIC
M8.15
ISL32435EIUZ
2435E
-40 to +85
-
8 Ld MSOP
M8.118
ISL32435EIUZ-T
2435E
-40 to +85
2.5k
8 Ld MSOP
M8.118
ISL32435EIUZ-T7A
2435E
-40 to +85
250
8 Ld MSOP
M8.118
ISL32437EIBZ
32437 EIBZ
-40 to +85
-
8 Ld SOIC
M8.15
ISL32437EIBZ-T
32437 EIBZ
-40 to +85
2.5k
8 Ld SOIC
M8.15
ISL32437EIBZ-T7A
32437 EIBZ
-40 to +85
250
8 Ld SOIC
M8.15
ISL32437EIUZ
2437E
-40 to +85
-
8 Ld MSOP
M8.118
ISL32437EIUZ-T
2437E
-40 to +85
2.5k
8 Ld MSOP
M8.118
ISL32437EIUZ-T7A
2437E
-40 to +85
250
8 Ld MSOP
M8.118
NOTES:
1. See TB347 for details about reel specifications.
2. These Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate
plus anneal (e3 termination finish, which is 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 ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E device pages. For more information about
MSL, see TB363.
FN7920 Rev.1.00
Feb 15, 2019
Page 3 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
TABLE 1. SUMMARY OF FEATURES
HALF/FULL
DUPLEX
DATA RATE
(Mbps)
SLEW-RATE
LIMITED?
EN
PINS?
HOT
PLUG
CABLE INVERT
(INV) PIN?
QUIESCENT ICC
(mA)
LOW POWER
SHUTDOWN?
PIN COUNT
ISL32430E
Full
0.25
Yes
Yes
No
No
2.1
Yes
10, 14
ISL32432E
Half
0.25
Yes
Yes
No
No
2.1
Yes
8
ISL32433E
Full
1
Yes
Yes
No
No
2.1
Yes
10, 14
ISL32435E
Half
1
Yes
Yes
No
No
2.1
Yes
8
ISL32437E
Half
0.25
Yes
Tx Only
No
Yes
2.1
No
8
PART
NUMBER
Pin Configurations
ISL32430E, ISL32433E
ISL32430E, ISL32433E
(14 LD SOIC)
TOP VIEW
NC 1
RO 2
R
RE 3
DE 4
D
DI 5
(10 LD MSOP)
TOP VIEW
14 VCC
RO 1
13 NC
RE 2
12 A
DE 3
11 B
DI 4
10 Z
GND 5
GND 6
9 Y
GND 7
8 NC
8
VCC
RO 1
RE 2
7
B/Z
DE 3
6
A/Y
5
GND
DI 4
R
D
DI 4
10 VCC
9 A
8 B
D
7 Z
6 Y
ISL32437E
(8 LD SOIC, 8 LD MSOP)
TOP VIEW
ISL32432E, ISL32435E
(8 LD SOIC, 8 LD MSOP)
TOP VIEW
RO 1
R
8
VCC
INV 2
7
B/Z
DE 3
6
A/Y
5
GND
R
D
Pin Descriptions
PIN NUMBER
PIN
NAME
ISL32430E, ISL32430E,
ISL32433E, ISL32433E, ISL32432E,
14 LD SOIC 10 LD MSOP ISL32435E ISL32437E
FUNCTION
RO
2
1
1
1
Receiver output. For parts without the cable invert function, or if INV is low, then: If
A - B -10mV, RO is high; if A - B -200mV, RO is low. If INV is high, then: If B - A -10mV,
RO is high; if B - A -200mV, RO is low. In all cases, RO = High if A and B are unconnected
(floating), or shorted together, or connected to an undriven, terminated bus (For
example, Rx is always fail-safe open, shorted, and idle, even if polarity is inverted).
RE
3
2
2
N/A
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE
is high. Internally pulled low.
DE
4
3
3
3
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high, and
they are high impedance when DE is low. Internally pulled high.
DI
5
4
4
4
Driver input. For parts without the cable invert function, or if INV is low, a low on DI
forces output Y low and output Z high, while a high on DI forces output Y high and
output Z low. The output states, relative to DI, invert if INV is high.
FN7920 Rev.1.00
Feb 15, 2019
Page 4 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Pin Descriptions (Continued)
PIN NUMBER
PIN
NAME
ISL32430E, ISL32430E,
ISL32433E, ISL32433E, ISL32432E,
14 LD SOIC 10 LD MSOP ISL32435E ISL32437E
FUNCTION
GND
6, 7
5
5
5
Ground connection.
A/Y
N/A
N/A
6
6
±40V Fault Protected and ±15kV ESD protected RS-485/RS-422 I/O pin. For parts
without the cable invert function, or if INV is low, A/Y is the non-inverting receiver input
and non-inverting driver output. If INV is high, A/Y is the inverting receiver input and
the inverting driver output. Pin is an input if DE = 0; pin is an output if DE = 1.
B/Z
N/A
N/A
7
7
±40V Fault Protected and ±15kV ESD protected RS-485/RS-422 I/O pin. For parts
without the cable invert function, or if INV is low, B/Z is the inverting receiver input and
inverting driver output. If INV is high, B/Z is the non-inverting receiver input and the
non-inverting driver output. Pin is an input if DE = 0; pin is an output if DE = 1.
A
12
9
N/A
N/A
±40V Fault Protected and ±15kV ESD protected RS-485/RS-422 non-inverting
receiver input.
B
11
8
N/A
N/A
±40V Fault Protected and ±15kV ESD protected RS-485/RS-422 inverting receiver
input.
Y
9
6
N/A
N/A
±40V Fault Protected and ±15kV ESD protected RS-485/RS-422 non-inverting driver
output.
Z
10
7
N/A
N/A
±40V Fault Protected and ±15kV ESD protected RS-485/RS-422 inverting driver
output.
VCC
14
10
8
8
System power supply input (3V to 5.5V).
INV
N/A
N/A
N/A
2
Receiver and driver Cable Invert (polarity selection) input. When driven high, this pin
swaps the polarity of the driver output and receiver input pins. If unconnected
(floating) or connected low, normal RS-485 polarity conventions apply. Internally
pulled low.
NC
1, 8, 13
N/A
N/A
N/A
No Internal Connection.
Truth Tables
RECEIVING
INPUTS
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
INV (Note 4)
Y
Z
X
1
1
0
1
0
X
1
0
0
0
1
X
1
1
1
0
1
X
1
0
1
1
0
0
0
X
X
High-Z
High-Z
1
0
X
X
High-Z*
High-Z*
NOTES:
4. Parts without the INV pin follow the rows with INV = “0” and “X”.
*Low Power Shutdown Mode (See Notes 13 and 18).
FN7920 Rev.1.00
Feb 15, 2019
OUTPUT
RE
(Note 18)
DE (Half
Duplex)
DE (Full
Duplex)
A-B
INV (Note 4)
RO
0
0
X
≥ -0.01V
0
1
0
0
X
≤ -0.2V
0
0
0
0
X
≤ 0.01V
1
1
0
0
X
≥ 0.2V
1
0
0
0
X
Inputs
Open or
Shorted
X
1
1
0
0
X
X
High-Z*
1
1
1
X
X
High-Z
NOTE: *Low Power Shutdown Mode (See Notes 13 and 18).
Page 5 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Absolute Maximum Ratings
Thermal Information
VCC to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE, INV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC + 0.3V
Input/Output Voltages
A/Y, B/Z, A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50V
A/Y, B/Z, A, B, Y, Z
(Transient Pulse Through 100Ω, Note 5) . . . . . . . . . . . . . . . . . . . ±60V
RO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC +0.3V)
Short-Circuit Duration
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . . . see“ESD PERFORMANCE” on page 7
Latch-Up (per JESD78, Level 2, Class A) . . . . . . . . . . . . . . . . . . . . . +125°C
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
8 Ld SOIC Package (Notes 6, 7) . . . . . . . . . .
108
47
8 Ld MSOP Package (Notes 6, 7) . . . . . . . . .
140
40
10 Ld MSOP Package (Notes 6, 7) . . . . . . . .
135
50
14 Ld SOIC Package (Notes 6, 7) . . . . . . . . .
88
39
Maximum Junction Temperature (Plastic Package). . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . . . -65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Supply Voltage (VCC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3V or 5V
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Bus Pin Common-Mode Voltage Range. . . . . . . . . . . . . . . . . . -15V to +15V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
5. Tested according to TIA/EIA-485-A, Section 4.2.6 (±60V for 15µs at a 1% duty cycle).
6. JA is measured with the component mounted on a high-effective thermal conductivity test board in free air. See TB379 for details.
7. For JC, the “case temp” location is taken at the package top center.
Electrical Specifications Test conditions: VCC = 3V to 3.6V and 4.5V to 5.5V; unless otherwise specified. Typical values are at the
worst case of VCC = 5V or VCC = 3.3V, TA = +25°C (Note 8). Boldface limits apply across the operating temperature range, -40°C to +85°C.
PARAMETER
TEMP
(°C)
MIN
(Note 16)
TYP
MAX
(Note 16)
UNIT
Full
-
-
VCC
V
RL = 100Ω (RS-422), VCC ≥ 4.5V
Full
2
3
-
V
RL = 54Ω (RS-485)
VCC ≥ 4.5V
Full
1.7
2.3
-
V
VCC = 3.3V
Full
1.35
1.42
-
V
VCC ≥ 3V
Full
1.1
1.3
-
V
SYMBOL
TEST CONDITIONS
DC CHARACTERISTICS
Driver Differential VOUT (No load)
VOD1
Driver Differential VOUT (Loaded,
Figure 6A)
VOD2
Change in Magnitude of Driver
Differential VOUT for Complementary
Output States
VOD
RL = 54Ω or 100Ω (Figure 6A)
Full
-
-
0.2
V
Driver Differential VOUT with
Common-Mode Load (Figure 6B)
VOD3
RL = 60Ω, -15V ≤ VCM ≤ 15V, VCC ≥ 4.5V
Full
1.5
-
-
V
Driver Common-Mode VOUT
(Figure 6A)
VOC
RL = 54Ω or 100Ω
Full
-1
-
3
V
Change in Magnitude of Driver
Common-Mode VOUT for
Complementary Output States
VOC
RL = 54Ω or 100Ω (Figure 6A)
Full
-
-
0.2
V
Driver Short-Circuit Current
IOSD
DE = VCC, -15V ≤ VO ≤ 15V (Note 10)
Full
-250
-
250
mA
IOSD1
At first foldback, 24V ≤ VO ≤ -24V
Full
-83
-
83
mA
IOSD2
At second foldback, 35V ≤ VO ≤ -35V
Full
-13
-
13
mA
Logic Input High Voltage
VIH
DE, DI, RE, INV (See Figure 28)
Full
2.35
-
-
V
Logic Input Low Voltage
VIL
DE, DI, RE, INV
Full
-
-
0.8
V
Logic Input Current
IIN1
DI
Full
-1
-
1
µA
DE, RE, INV
Full
-15
6
15
µA
FN7920 Rev.1.00
Feb 15, 2019
Page 6 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Electrical Specifications Test conditions: VCC = 3V to 3.6V and 4.5V to 5.5V; unless otherwise specified. Typical values are at the
worst case of VCC = 5V or VCC = 3.3V, TA = +25°C (Note 8). Boldface limits apply across the operating temperature range, -40°C to +85°C.
PARAMETER
Input/Output Current (A/Y, B/Z)
Input Current (A, B)
(Full Duplex Versions Only)
Output Leakage Current (Y, Z)
(Full Duplex Versions Only)
SYMBOL
IIN2
IIN3
IOZD
TEST CONDITIONS
DE = 0V, VCC = 0V or VIN = 12V
3.6V or 5.5V
VIN = -7V
VCC = 0V or 3.6V or
5.5V
TYP
MAX
(Note 16)
UNIT
Full
-
-
250
µA
Full
-200
-
-
µA
VIN = ±15V
Full
-800
-
850
µA
VIN = ±40V, (Note 17)
Full
-6
-
6
mA
VIN = 12V
Full
-
-
125
µA
VIN = -7V
Full
-100
-
-
µA
VIN = ±15V
Full
-500
-
500
µA
VIN = ±40V, (Note 17)
Full
-3
-
3
mA
Full
-
-
200
µA
VIN = -7V
Full
-100
-
-
µA
VIN = ±15V
Full
-500
-
500
µA
VIN = ±40V, (Note 17)
Full
-3
-
3
mA
VCC ≤ 3.6V
-15V ≤ VCM ≤ 15V,
(For ISL32437E only,
A-B if INV = 0; B-A if VCC ≥ 4.5V
INV = 1)
Full
-200
-120
-10
mV
Full
-250
-180
-10
mV
+25
-
30
-
mV
IO = -4mA, VCC ≥ 3V
Full
2.4
-
-
V
IO = -8mA, VCC ≥ 4.5V
Full
2.4
-
-
V
IO = 4mA, VCC ≥ 3V, VID = -200mV
Full
-
-
0.4
V
IO = 5mA, VCC ≥ 4.5V, VID = -250mV
Full
-
-
0.4
V
VTH
Receiver Input Hysteresis
VTH
-15V ≤ VCM ≤ 15V
Receiver Output High Voltage
VOH1
VID = -10mV
VOH2
VOL
MIN
(Note 16)
VIN = 12V
RE = 0V, DE = 0V,
VCC = 0V or 3.6V or
5.5V
Receiver Differential Threshold
Voltage
Receiver Output Low Voltage
TEMP
(°C)
Three-State (High Impedance)
Receiver Output Current (Note 18)
IOZR
0V ≤ VO ≤ VCC
Full
-1
0.01
1
µA
Receiver Short-Circuit Current
IOSR
0V ≤ VO ≤ VCC
Full
-
-
±115
mA
DE = VCC, RE = 0V or VCC, DI = 0V or VCC
Full
-
2.1
4.5
mA
DE = 0V, RE = VCC, DI = 0V or VCC
Full
-
10
35
µA
Human Body Model
(Tested per JESD22-A114E)
+25
-
±8
-
kV
Machine Model
(Tested per JESD22-A115-A)
+25
-
±700
-
V
Human Body Model, Full Duplex
from Bus Pins to GND
Half Duplex
+25
-
±15
-
kV
+25
-
±16.5
-
kV
SUPPLY CURRENT
No-Load Supply Current (Note 9)
Shutdown Supply Current (Note 18)
ICC
ISHDN
ESD PERFORMANCE
All Pins
RS-485 Pins (A, B, Y, Z,
A/Y, B/Z)
DRIVER SWITCHING CHARACTERISTICS (250kbps Versions; ISL32430E, ISL32432E, ISL32437E)
Driver Differential Output Delay
tPLH, tPHL
RD = 54Ω, CD = 50pF (Figure 7)
Full
-
280
1000
ns
Driver Differential Output Skew
tSKEW
RD = 54Ω, CD = 50pF (Figure 7)
Full
-
4
100
ns
Driver Differential Rise or Fall Time
tR, tF
RD = 54Ω, CD = 50pF (Figure 7)
Full
250
650
1500
ns
Maximum Data Rate
fMAX
CD = 820pF (Figure 9)
Full
250
-
-
kbps
Driver Enable to Output High
tZH
SW = GND (Figure 8), (Note 11)
Full
-
-
1600
ns
Driver Enable to Output Low
tZL
SW = VCC (Figure 8), (Note 11)
Full
-
-
1600
ns
FN7920 Rev.1.00
Feb 15, 2019
Page 7 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Electrical Specifications Test conditions: VCC = 3V to 3.6V and 4.5V to 5.5V; unless otherwise specified. Typical values are at the
worst case of VCC = 5V or VCC = 3.3V, TA = +25°C (Note 8). Boldface limits apply across the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
(Note 16)
TYP
MAX
(Note 16)
UNIT
Driver Disable from Output Low
tLZ
SW = VCC (Figure 8)
Full
-
-
300
ns
Driver Disable from Output High
tHZ
SW = GND (Figure 8)
Full
-
-
300
ns
(Notes 13, 18)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Driver Enable from Shutdown to
Output High
tZH(SHDN)
SW = GND (Figure 8), (Notes 13, 14, 18)
Full
-
-
3000
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
SW = VCC (Figure 8), (Notes 13, 14, 18)
Full
-
-
3000
ns
DRIVER SWITCHING CHARACTERISTICS (1Mbps Versions; ISL32433E and ISL32435E)
Driver Differential Output Delay
tPLH, tPHL
RD = 54Ω, CD = 50pF (Figure 7)
Full
-
70
200
ns
Driver Differential Output Skew
tSKEW
RD = 54Ω, CD = 50pF (Figure 7)
Full
-
4
25
ns
Driver Differential Rise or Fall Time
tR, tF
RD = 54Ω, CD = 50pF (Figure 7)
Full
50
130
300
ns
Maximum Data Rate
fMAX
CD = 820pF (Figure 9)
Full
1
-
-
Mbps
Driver Enable to Output High
tZH
SW = GND (Figure 8), (Note 11)
Full
-
-
300
ns
Driver Enable to Output Low
tZL
SW = VCC (Figure 8), (Note 11)
Full
-
-
300
ns
Driver Disable from Output Low
tLZ
SW = VCC (Figure 8)
Full
-
-
300
ns
Driver Disable from Output High
tHZ
SW = GND (Figure 8)
Full
-
-
300
ns
(Note 13)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Driver Enable from Shutdown to
Output High
tZH(SHDN)
SW = GND (Figure 8), (Notes 13, 14)
Full
-
-
3000
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
SW = VCC (Figure 8), (Notes 13, 14)
Full
-
-
3000
ns
RECEIVER SWITCHING CHARACTERISTICS (250kbps Versions; ISL32430E, ISL32432E, ISL32437E)
Maximum Data Rate
Receiver Input to Output Delay
Receiver Skew |tPLH - tPHL |
fMAX
(Figure 10)
Full
250
-
-
kbps
tPLH, tPHL
(Figure 10)
Full
-
240
325
ns
tSKD
(Figure 10)
Full
-
6
25
ns
Receiver Enable to Output Low
tZL
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 11),
(Notes 12, 18)
Full
-
-
80
ns
Receiver Enable to Output High
tZH
RL = 1kΩ, CL = 15pF, SW = GND (Figure 11),
(Notes 12, 18)
Full
-
-
80
ns
Receiver Disable from Output Low
tLZ
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 11),
(Note 18)
Full
-
-
80
ns
Receiver Disable from Output High
tHZ
RL = 1kΩ, CL = 15pF, SW = GND (Figure 11),
(Note 18)
Full
-
-
80
ns
(Notes 13, 18)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Receiver Enable from Shutdown to
Output High
tZH(SHDN)
RL = 1kΩ, CL = 15pF, SW = GND (Figure 11),
(Notes 13, 15, 18)
Full
-
-
2500
ns
Receiver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 11),
(Notes 13, 15, 18)
Full
-
-
2500
ns
RECEIVER SWITCHING CHARACTERISTICS (1Mbps Versions; ISL32433E, ISL32435E)
Maximum Data Rate
Receiver Input to Output Delay
Receiver Skew |tPLH - tPHL |
FN7920 Rev.1.00
Feb 15, 2019
fMAX
(Figure 10)
Full
1
-
-
Mbps
tPLH, tPHL
(Figure 10)
Full
-
115
200
ns
tSKD
(Figure 10)
Full
-
4
20
ns
Page 8 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Electrical Specifications Test conditions: VCC = 3V to 3.6V and 4.5V to 5.5V; unless otherwise specified. Typical values are at the
worst case of VCC = 5V or VCC = 3.3V, TA = +25°C (Note 8). Boldface limits apply across the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
(Note 16)
TYP
MAX
(Note 16)
UNIT
Receiver Enable to Output Low
tZL
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 11),
(Note 12)
Full
-
-
80
ns
Receiver Enable to Output High
tZH
RL = 1kΩ, CL = 15pF, SW = GND (Figure 11),
(Note 12)
Full
-
-
80
ns
Receiver Disable from Output Low
tLZ
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 11)
Full
-
-
80
ns
Receiver Disable from Output High
tHZ
RL = 1kΩ, CL = 15pF, SW = GND (Figure 11)
Full
-
-
80
ns
(Note 13)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Receiver Enable from Shutdown to
Output High
tZH(SHDN)
RL = 1kΩ, CL = 15pF, SW = GND (Figure 11),
(Notes 13, 15)
Full
-
-
2500
ns
Receiver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 11),
(Notes 13, 15)
Full
-
-
2500
ns
NOTES:
8. 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.
9. Supply current specification is valid for loaded drivers when DE = 0V.
10. Applies to peak current. See “Typical Performance Curves” beginning on page 11 for more information.
11. Keep RE = 0 to prevent the device from entering SHDN (does not apply to the ISL32437E).
12. The RE signal high time must be short enough (typically 600ns to ensure that the device enters SHDN.
15. Set the RE signal high time >600ns to ensure that the device enters SHDN.
16. Compliance to data sheet limits is assured by one or more methods: production test, characterization and/or design.
17. See “Caution” statement below “Absolute Maximum Ratings” on page 6.
18. Does not apply to the ISL32437E. The ISL32437E has no Rx enable function, and thus no SHDN function.
Test Circuits and Waveforms
VCC
RL/2
DE
DI
VCC
Z
DI
VOD
D
Y
375Ω
Z
VCM
VOD
D
Y
RL/2
FIGURE 6A. VOD AND VOC
RL/2
DE
VOC
RL/2
375Ω
FIGURE 6B. VOD WITH COMMON-MODE LOAD
FIGURE 6. DC DRIVER TEST CIRCUITS
FN7920 Rev.1.00
Feb 15, 2019
Page 9 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Test Circuits and Waveforms (Continued)
3V
DI
50%
50%
0V
VCC
tPHL
tPLH
DE
Z
DI
CD
D
RD
Y
OUT (Z)
VOH
OUT (Y)
VOL
SIGNAL
GENERATOR
90%
DIFF OUT (Y - Z)
+VOD
90%
10%
10%
tR
-VOD
tF
SKEW = |tPLH - tPHL|
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7A. TEST CIRCUIT
FIGURE 7. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
DE
Z
DI
110Ω
VCC
D
SIGNAL
GENERATOR
GND
SW
Y
3V
CL
DE
Note 13
tZH, tZH(SHDN)
Note 13
PARAMETER
OUTPUT
RE
DI
SW
CL (pF)
tHZ
Y/Z
X
1/0
GND
50
tLZ
Y/Z
X
0/1
VCC
50
tZH
Y/Z
0 (Note 11)
1/0
GND
100
tZL, tZL(SHDN)
100
Note 13
tZL
Y/Z
0 (Note 11)
0/1
VCC
tZH(SHDN)
Y/Z
1 (Note 14)
1/0
GND
100
tZL(SHDN)
Y/Z
1 (Note 14)
0/1
VCC
100
50%
50%
0V
tHZ
OUTPUT HIGH
50%
OUT (Y, Z)
VOH
VOH - 0.5V
0V
tLZ
VCC
OUT (Y, Z)
50%
VOL + 0.5V
VOL
OUTPUT LOW
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8A. TEST CIRCUIT
FIGURE 8. DRIVER ENABLE AND DISABLE TIMES
VCC
3V
DE
+
Z
DI
54Ω
D
Y
SIGNAL
GENERATOR
CD
DI
0V
VOD
-
+VOD
DIFF OUT (Y - Z)
-VOD
0V
FIGURE 9B. MEASUREMENT POINTS
FIGURE 9A. TEST CIRCUIT
FIGURE 9. DRIVER DATA RATE
FN7920 Rev.1.00
Feb 15, 2019
Page 10 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Test Circuits and Waveforms (Continued)
RE
B
R
A
SIGNAL
GENERATOR
B
15pF
RO
+2.25V
1.5V
1.5V
+750mV
A
tPHL
tPLH
SIGNAL
GENERATOR
VCC
50%
RO
+1.5V
50%
0V
FIGURE 10A. TEST CIRCUIT
FIGURE 10B. MEASUREMENT POINTS
FIGURE 10. RECEIVER PROPAGATION DELAY AND DATA RATE
RE
B
A
R
VCC
1kΩ
RO
SIGNAL
GENERATOR
RE
GND
SW
15pF
Note 13
3V
50%
50%
0V
tZH, tZH(SHDN)
Note 13
PARAMETER
DE
A
SW
tHZ
0
+1.5V
GND
tLZ
0
-1.5V
VCC
tZL, tZL(SHDN)
tZH (Note 12)
0
+1.5V
GND
Note 13
tZL (Note 12)
0
-1.5V
VCC
RO
tZH(SHDN) (Note 15)
0
+1.5V
GND
tZL(SHDN) (Note 15)
0
-1.5V
VCC
tHZ
OUTPUT HIGH
VOH - 0.5V
1.5V
RO
VOH
0V
tLZ
VCC
1.5V
VOL + 0.5V
VOL
OUTPUT LOW
FIGURE 11B. MEASUREMENT POINTS
FIGURE 11A. TEST CIRCUIT
FIGURE 11. RECEIVER ENABLE AND DISABLE TIMES
Typical Performance Curves TA = +25°C; unless otherwise specified.
DRIVER OUTPUT CURRENT (mA)
RD = 20Ω
70
+25°C
60
RD = 30Ω
RD = 54Ω
+85°C
+25°C
50
40
+85°C
RD = 100Ω
30
20
VCC = 5V
10
0
VCC = 3.3V
0
0.5
1
1.5
2
2.5
3
3.5
4
DIFFERENTIAL OUTPUT VOLTAGE (V)
4.5
5
FIGURE 12. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT
VOLTAGE
FN7920 Rev.1.00
Feb 15, 2019
DIFFERENTIAL OUTPUT VOLTAGE (V)
3.25
80
VCC = 5V
3.00
2.75
RD = 100Ω
VCC = 5V
2.50
RD = 54Ω
2.25
2.00
1.75
RD = 100Ω
VCC = 3.3V
RD = 54Ω
1.50
1.25
-40 -30 -20 -10
VCC = 3.3V
0
10
20
30
40
50
60
70
80 85
TEMPERATURE (°C)
FIGURE 13. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
Page 11 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Typical Performance Curves TA = +25°C; unless otherwise specified. (Continued)
2.2
80
VOL, +25°C
DE = VCC, RE = X
2.1
DE = GND, RE = GND
1.9
VCC = 5V
1.8
DE = VCC, RE = X
1.7
VCC = 3.3V
1.6
DE = GND, RE = GND
1.5
VCC = 3.3V
1.4
-40 -30 -20 -10
0
10
20
30
40
50
60
70
RECEIVER OUTPUT CURRENT (mA)
2.0
ICC (mA)
VCC = 5V
60
VCC = 5V
VOL, +85°C
VOL, +25°C
VCC = 3.3V
40
VOL, +85°C
20
VCC = 3.3V
0
VOH, +85°C
-20
VOH, +85°C
-40
VOH, +25°C
-60
80 85
0
0.5
TEMPERATURE (°C)
1.0
150
VCC = 0V to 5.5V
OUTPUT CURRENT (mA)
BUS PIN CURRENT (µA)
200
100
0
Y OR Z
-200
75
-10
0
10
20
30
Y OR Z = HIGH
-50
VCC = 3.3V
270
VCC = 3.3V, +25°C
VCC = 3.3V, +85°C
VCC = 5V, +85°C
-30
-20
0
10
20
30
40
6
5
tPLH
SKEW (ns)
250
240
tPLH
VCC = 5V
4
3
2
VCC = 3.3V
VCC = 5V
tPHL
1
210
|tPLH - tPHL|
0
10
20
30
40
50
60
70
80 85
TEMPERATURE (°C)
FIGURE 18. DRIVER DIFFERENTIAL PROPAGATION DELAY vs
TEMPERATURE (ISL32430E, ISL32432E, ISL32437E)
FN7920 Rev.1.00
Feb 15, 2019
-10
7
260
200
-40 -30 -20 -10
VCC = 5V, +25°C
OUTPUT VOLTAGE (V)
tPHL
220
VCC = 5V, +85°C
FIGURE 17. DRIVER OUTPUT CURRENT vs SHORT-CIRCUIT VOLTAGE
RD = 54Ω, CD = 50pF
230
5.0
VCC = 5V, +25°C
-125
-40
40
FIGURE 16. BUS PIN CURRENT vs BUS PIN VOLTAGE
290
4.5
0
-25
BUS PIN VOLTAGE (V)
300
4.0
25
-100
A/Y OR B/Z
-20
3.5
Y OR Z = LOW
50
-75
-300
-30
3.0
VCC = 3.3V, +25°C
100
PROPAGATION DELAY (ns)
2.5
VCC = 3.3V, +85°C
125
300
280
2.0
FIGURE 15. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT
VOLTAGE
400
-400
-40
1.5
RECEIVER OUTPUT VOLTAGE (V)
FIGURE 14. SUPPLY CURRENT vs TEMPERATURE
-100
VCC = 5V
VOH, +25°C
0
-40 -30 -20 -10
0
10 20 30 40 50
TEMPERATURE (°C)
60
70
80 85
FIGURE 19. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE
(ISL32430E, ISL32432E, ISL32437E)
Page 12 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Typical Performance Curves TA = +25°C; unless otherwise specified. (Continued)
75
70
tPLH
VCC = 3.3V
4.0
VCC = 5V
3.5
tPHL
3.0
65
SKEW (ns)
60
tPLH
tPHL
50
-40 -30 -20 -10
0
10
2.0
1.5
VCC = 3.3V
1.0
VCC = 5V
55
2.5
0.5
20
30
40
50
60
70
|tPLH - tPHL|
0
-40 -30 -20 -10
80 85
TEMPERATURE (°C)
RO
5
VCC = 3.3V
0
VCC = 5V
5
RO
0
VCC = 3.3V
B
RO
VCC = 3.3V
A
TIME (1µs/DIV)
RO
2
1
A/Y - B/Z
-1
-2
TIME (1µs/DIV)
FIGURE 24. VCC = 3.3V, DRIVER AND RECEIVER WAVEFORMS
(ISL32430E, ISL32432E, ISL32437E)
RECEIVER OUTPUT (V)
0
DRIVER OUTPUT (V)
3
FN7920 Rev.1.00
Feb 15, 2019
TIME (400ns/DIV)
FIGURE 23. ±15V RECEIVER PERFORMANCE (ISL32433E,
ISL32435E)
RD = 54Ω, CD = 50pF
DI
B
-20
DRIVER INPUT (V)
RECEIVER OUTPUT (V)
VCC = 3.3V
VCC = 5V
5
-15
FIGURE 22. ±15V RECEIVER PERFORMANCE (ISL32430E,
ISL32432E, ISL32437E)
DRIVER OUTPUT (V)
RO
-10
A
-20
0
80 85
-5
-15
0
70
VID = ±1V
1Mbps
VCC = 5V
0
-5
-10
3
B
10
VOLTAGE (V)
VOLTAGE (V)
0
VID = ±1V
250kbps
VCC = 5V
60
A
15
B
10
5
20
A
15
10 20 30 40 50
TEMPERATURE (°C)
FIGURE 21. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE
(ISL32433E, ISL32435E)
FIGURE 20. DRIVER DIFFERENTIAL PROPAGATION DELAY vs
TEMPERATURE (ISL32433E, ISL32435E)
20
0
RD = 54Ω, CD = 50pF
3
DI
0
3
0
RO
DRIVER INPUT (V)
PROPAGATION DELAY (ns)
4.5
RD = 54Ω, CD = 50pF
2
1
0
A/Y - B/Z
-1
-2
TIME (400ns/DIV)
FIGURE 25. VCC = 3.3V, DRIVER AND RECEIVER WAVEFORMS
(ISL32433E, ISL32435E)
Page 13 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
5
0
RO
3
2
1
0
-1
-2
-3
A/Y - B/Z
TIME (1µs/DIV)
RD = 54Ω, CD = 50pF
DI
5
0
5
RO
0
DRIVER INPUT (V)
0
RECEIVER OUTPUT (V)
DI
5
DRIVER INPUT (V)
RD = 54Ω, CD = 50pF
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
RECEIVER OUTPUT (V)
Typical Performance Curves TA = +25°C; unless otherwise specified. (Continued)
3
2
1
0
-1
A/Y - B/Z
-2
-3
TIME (400ns/DIV)
FIGURE 27. VCC = 5V, DRIVER AND RECEIVER WAVEFORMS
(ISL32433E, ISL32435E)
FIGURE 26. VCC = 5V, DRIVER AND RECEIVER WAVEFORMS
(ISL32430E, ISL32432E, ISL32437E)
2.4
INPUT HIGH VOLTAGE (V)
2.2
VCC = 5V
2.0
1.8
1.6
VCC = 3.3V
1.4
1.2
1.0
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80 85
TEMPERATURE (°C)
FIGURE 28. LOGIC INPUT HIGH VOLTAGE vs TEMPERATURE
FN7920 Rev.1.00
Feb 15, 2019
Page 14 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Application Information
Driver (Tx) Features
RS-485 and RS-422 are differential (balanced) data
transmission standards used for 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
(assuming one-unit load devices) on each bus. RS-485 is a true
multipoint standard that 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.
The RS-485 and RS-422 drivers are differential output devices
that deliver at least 1.7V across a 54Ω load (RS-485), and at
least 2V across a 100Ω load (RS-422) with VCC ≥ 4.5V. The
drivers feature low propagation delay skew to maximize bit
width, and to minimize EMI. All drivers are three-statable using
the active high DE input.
An important advantage of RS-485 is the extended
Common-Mode Range (CMR) that 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.
A family of ruggedized RS-485 transceivers, the ISL3243xE
devices improve on the RS-485 basic requirements and increase
system reliability. The CMR increases to ±15V and the RS-485
bus pins (receiver inputs and driver outputs) include fault
protection against voltages and transients up to ±40V.
Additionally, the ±15kV to ±16.5kV built-in ESD protection
complements the fault protection.
Receiver (Rx) Features
The ISL3243xE devices use a differential input receiver for
maximum noise immunity and common-mode rejection. Input
sensitivity is better than ±200mV (3.3V operation) as required by
the RS-422 and RS-485 specifications.
The receiver input (load) current surpasses the RS-422
specification of 3mA and is four times lower than the RS-485
Unit Load (UL) requirement of 1mA maximum; therefore, these
products are known as one-quarter UL transceivers. There can be
up to 128 of these devices on a network while still complying
with the RS-485 loading specification.
The receivers functions with common-mode voltages as great as
±15V, so they are ideal for industrial or long networks where
induced voltages are a realistic concern.
All the receivers include a full fail-safe function that ensures a
high-level receiver output if the receiver inputs are unconnected
(floating), shorted together, or connected to a terminated bus
with all the transmitters disabled (an idle bus).
The 250kbps and 1Mbps driver outputs are slew rate limited to
minimize EMI and reflections in unterminated or improperly
terminated networks.
High Overvoltage (Fault) Protection
Increases Ruggedness
The ±40V fault protection (referenced to the IC GND) on the
RS-485 pins makes these transceivers some of the most rugged
on the market. This level of protection makes the ISL3243xE
family perfect for applications where power (such as 24V
supplies) must be routed in the conduit with the data lines or for
outdoor applications where large transients are likely to occur. When
power is routed with the data lines, even a momentary short between
the supply and data lines destroys an unprotected device. The ±40V
fault levels of this family are at least three times higher than the
levels specified for standard RS-485 ICs. The ISL3243xE’s protection
is active whether the Tx is enabled or disabled, and even if the IC is
powered down or VCC and Ground are floating.
If transients or voltages (including overshoots and ringing)
greater than ±50V are possible, additional external protection is
required. Use a protection device with the lowest clamping
voltage acceptable for the application, and note, TVS type
devices typically clamp 5V to 10V above the designated stand-off
voltage (such as a “45V TVS” clamps between 50V and 55V).
Wide Common-Mode Voltage (CMV) Tolerance
Improves Operating Range
RS-485 networks, operating in industrial complexes or over long
distances, are susceptible to large CMV variations. Either of these
operating environments can suffer from large node-to-node
ground potential differences or CMV pickup from external
electromagnetic sources; devices with only the minimum
required +12V to -7V CMR can malfunction. The ISL3243xE’s
extended ±15V CMR allows for operation in environments that
would overwhelm lesser transceivers. Additionally, the Rx does
not phase invert (erroneously change state) even with CMVs of
±20V or differential voltages as large as 40V.
The receivers easily meet the data rates supported by the
corresponding driver, and most receiver outputs are
three-statable using the active low RE input.
The Rx in the 250kbps (ISL32430E, ISL32432E, and ISL32437E)
and 1Mbps versions (ISL32433E and ISL32435E) include noise
filtering circuitry to reject high-frequency signals. The ISL32433E
and ISL32435 typically reject pulses narrower than 50ns
(equivalent to 20Mbps). The ISL32430E, ISL32432E, and
ISL32437E Rx reject pulses below 150ns (6.7Mbps).
FN7920 Rev.1.00
Feb 15, 2019
Page 15 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Cable Invert (Polarity Reversal) Function
Built-In Driver Overload Protection
Large node count RS-485 networks are commonly wired
backwards during installation. When this happens, the node is
unable to communicate over the network. When technicians find
the miswired node, they must rewire the connector, which is time
consuming.
The RS-485 specification requires that drivers survive worst case
bus contentions undamaged. These transceivers meet this
requirement using driver output short-circuit current limits and
on-chip thermal shutdown circuitry.
The ISL32437E simplifies this task by including a cable invert pin
(INV) that allows the technician to invert the polarity of the Rx
input and the Tx output pins simply by moving a jumper to
change the state of the invert pin. When the invert pin is low, the
IC operates like any standard RS-485 transceiver, and the bus
pins have their normal polarity definition of A and Y being
noninverting and B and Z being inverting. With the invert pin
high, the corresponding bus pins reverse their polarity, so B and Z
are now noninverting while A and Y become inverting.
This unique cable invert function is superior to that found on
competing devices, because the Rx full fail-safe function is
maintained even when the Rx polarity is reversed. Competitor
devices implement the Rx invert function simply by inverting the
Rx output. Therefore, with the Rx inputs floating or shorted
together, the Rx appropriately delivers a logic 1 in normal polarity
but outputs a logic low when the IC is operated in the inverted
mode. The innovative Renesas Rx design ensures that the Rx
output remains high with the Rx inputs floating or shorted
together (VID = 0V), regardless of the state of the invert pin.
Data Rate, Cables, and Terminations
RS-485/RS-422 are intended for network lengths up to 4000ft,
but the maximum system data rate decreases as the
transmission length increases. The ISL32433E and ISL32435E
can operate at full data rates of 1Mbps with lengths up to 800ft
(244m). Jitter is the limiting parameter at this faster data rate, so
employing encoded data streams (such as Manchester coded or
Return-to-Zero) can allow increased transmission distances. The
ISL32430E, ISL32432E, and ISL32437E can operate at 115kbps
or less at the full 4000ft (1220m) distance or at 250kbps for
lengths up to 3000ft (915m). DC cable attenuation is the limiting
parameter, so using better quality cables (such as 22 AWG) can
allow increased transmission distance.
Use a twisted pair cable for RS-485/RS-422 networks. Twisted
pair cables tend to pick up noise and other electromagnetically
induced voltages as common-mode signals that are effectively
rejected by the differential receivers in these ICs.
Short networks using the ISL32430E, ISL32432E, and
ISL32437E do not need to be terminated; however, terminations
are recommended unless power dissipation is an overriding
concern.
The driver output stages incorporate a double fold-back
short-circuit current limiting scheme ensuring that the output
current never exceeds the RS-485 specification even at the
common-mode and fault-condition voltage range extremes. The
first foldback current level (≈83mA) is set to ensure that the
driver never folds back when driving loads with common-mode
voltages up to ±15V. The very low, second foldback current
setting (≈13mA) minimizes power dissipation if the Tx is enabled
when a fault occurs.
In the event of a major short-circuit condition, The ISL3243xE’s
thermal shutdown feature disables the drivers whenever the die
temperature becomes excessive. Thermal shutdown eliminates
the power dissipation allowing the die to cool. The drivers
automatically re-enable after the die temperature drops about
+15°C. If the contention persists, the thermal shutdown/re-enable
cycle repeats until the fault is cleared. The receivers stay
operational during thermal shutdown.
Low Power Shutdown Mode
These BiCMOS transceivers all use a fraction of the power
required by competitive devices, but they (excluding ISL32437E)
also include a shutdown feature that reduces the already low
quiescent ICC to a 10µA trickle. The ISL3243xE family enter
shutdown whenever the receiver and driver are simultaneously
disabled (RE = VCC and DE = GND) for a period of at least 600ns.
Disabling both the driver and the receiver for less than 60ns
ensures that the transceiver does not enter shutdown.
Note that receiver and driver enable times increase when the
transceiver enables from shutdown. See Notes 11 through 15 on
page 9 for more information.
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP):
GND
PROCESS:
Si Gate BiCMOS
In point-to-point or point-to-multipoint networks (single driver on
bus like RS-422), 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. Multipoint (multi-driver)
systems require that the main cable is terminated in its
characteristic impedance at both ends. Keep stubs connecting a
transceiver to the main cable as short as possible.
FN7920 Rev.1.00
Feb 15, 2019
Page 16 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please go to web to make sure you have the latest Rev.
DATE
REVISION
Feb 15, 2019
FN7920.1
Updated links throughout document.
Updated Related Literature section.
Updated ordering information table by adding all tape and reel information and updating notes.
Updated last sentence in first paragraph in “High Overvoltage (Fault) Protection Increases Ruggedness” on
page 15.
Removed Products section.
Updated disclaimer.
Mar 1, 2012
FN7920.0
Initial Release
FN7920 Rev.1.00
Feb 15, 2019
CHANGE
Page 17 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Package Outline Drawings
For the most recent package outline drawing, see M8.118.
M8.118
8 LEAD MINI SMALL OUTLINE PLASTIC PACKAGE
Rev 4, 7/11
5
3.0±0.05
A
DETAIL "X"
D
8
1.10 MAX
SIDE VIEW 2
0.09 - 0.20
4.9±0.15
3.0±0.05
5
0.95 REF
PIN# 1 ID
1
2
B
0.65 BSC
GAUGE
PLANE
TOP VIEW
0.55 ± 0.15
0.25
3°±3°
0.85±010
H
DETAIL "X"
C
SEATING PLANE
0.25 - 0.36
0.08 M C A-B D
0.10 ± 0.05
0.10 C
SIDE VIEW 1
(5.80)
NOTES:
(4.40)
(3.00)
1. Dimensions are in millimeters.
(0.65)
(0.40)
(1.40)
TYPICAL RECOMMENDED LAND PATTERN
FN7920 Rev.1.00
Feb 15, 2019
2. Dimensioning and tolerancing conform to JEDEC MO-187-AA
and AMSEY14.5m-1994.
3. Plastic or metal protrusions of 0.15mm max per side are not
included.
4. Plastic interlead protrusions of 0.15mm max per side are not
included.
5. Dimensions are measured at Datum Plane "H".
6. Dimensions in ( ) are for reference only.
Page 18 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
M8.15
For the most recent package outline drawing, see M8.15.
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
Rev 4, 1/12
DETAIL "A"
1.27 (0.050)
0.40 (0.016)
INDEX
6.20 (0.244)
5.80 (0.228)
AREA
0.50 (0.20)
x 45°
0.25 (0.01)
4.00 (0.157)
3.80 (0.150)
1
2
8°
0°
3
0.25 (0.010)
0.19 (0.008)
SIDE VIEW “B”
TOP VIEW
2.20 (0.087)
SEATING PLANE
5.00 (0.197)
4.80 (0.189)
1.75 (0.069)
1.35 (0.053)
1
8
2
7
0.60 (0.023)
1.27 (0.050)
3
6
4
5
-C-
1.27 (0.050)
0.51(0.020)
0.33(0.013)
SIDE VIEW “A
0.25(0.010)
0.10(0.004)
5.20(0.205)
TYPICAL RECOMMENDED LAND PATTERN
NOTES:
19. Dimensioning and tolerancing per ANSI Y14.5M-1994.
20. Package length does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006
inch) per side.
21. Package width does not include interlead flash or protrusions. Interlead
flash and protrusions shall not exceed 0.25mm (0.010 inch) per side.
22. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
23. Terminal numbers are shown for reference only.
24. The lead width as measured 0.36mm (0.014 inch) or greater above the
seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch).
25. Controlling dimension: MILLIMETER. Converted inch dimensions are not
necessarily exact.
26. This outline conforms to JEDEC publication MS-012-AA ISSUE C.
FN7920 Rev.1.00
Feb 15, 2019
Page 19 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
M10.118
For the most recent package outline drawing, see M10.118.
10 LEAD MINI SMALL OUTLINE PLASTIC PACKAGE
Rev 1, 4/12
5
3.0±0.05
A
DETAIL "X"
D
10
1.10 MAX
SIDE VIEW 2
0.09 - 0.20
4.9±0.15
3.0±0.05
5
0.95 REF
PIN# 1 ID
1
2
0.50 BSC
B
GAUGE
PLANE
TOP VIEW
0.55 ± 0.15
0.25
3°±3°
0.85±010
H
DETAIL "X"
C
SEATING PLANE
0.18 - 0.27
0.08 M C A-B D
0.10 ± 0.05
0.10 C
SIDE VIEW 1
(5.80)
NOTES:
(4.40)
(3.00)
1. Dimensions are in millimeters.
2. Dimensioning and tolerancing conform to JEDEC MO-187-BA
and AMSEY14.5m-1994.
3. Plastic or metal protrusions of 0.15mm max per side are not
included.
4. Plastic interlead protrusions of 0.15mm max per side are not
included.
(0.50)
(0.29)
(1.40)
5. Dimensions are measured at Datum Plane "H".
6. Dimensions in ( ) are for reference only.
TYPICAL RECOMMENDED LAND PATTERN
FN7920 Rev.1.00
Feb 15, 2019
Page 20 of 22
ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
M14.15
For the most recent package outline drawing, see 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 identifier 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
FN7920 Rev.1.00
Feb 15, 2019
Page 21 of 22
1RWLFH
'HVFULSWLRQVRIFLUFXLWVVRIWZDUHDQGRWKHUUHODWHGLQIRUPDWLRQLQWKLVGRFXPHQWDUHSURYLGHGRQO\WRLOOXVWUDWHWKHRSHUDWLRQRIVHPLFRQGXFWRUSURGXFWV
DQGDSSOLFDWLRQH[DPSOHV
工商网监
湘ICP备2023018690号
