DATASHEET
ISL3332, ISL3333
FN6362
Rev 1.00
Jan 21, 2021
3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485)
Transceivers
The ISL3332, ISL3333 are two port interface ICs where each
port can be independently configured as a single
RS-485/422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232
transceiver. With both ports set to the same mode, two
RS-485/RS-422 transceivers, or four RS-232 transceivers
are available.
If either port is in RS-232 mode, the onboard charge pump
generates RS-232 compliant 5V Tx output levels from a
single VCC supply as low as 3.15V. The transceivers are
RS-232 compliant, with the Rx inputs handling up to 25V.
In RS-485 mode, the transceivers support both the RS-485
and RS-422 differential communication standards. The
receivers feature “full fail-safe” operation, so the Rx outputs
remain in a high state if the inputs are open or shorted
together. The transmitters support up to three data rates, two
of which are slew rate limited for problem free
communications. The charge pump disables when both
ports are in RS-485 mode, thereby saving power, minimizing
noise, and eliminating the charge pump capacitors.
Features
• 15kV (HBM) ESD Protected Bus Pins (RS-232 or
RS-485)
• Operates From a Single 3.3V Supply
• Two Independent Ports, Each User Selectable for RS-232
(2 Transceivers) or RS-485/RS-422 (1 Transceiver)
• True Flow-Through Pinouts Simplify Board Layouts
• Pb-free (RoHS compliant)
• Full Failsafe (Open/Short) Rx in RS-485/422 Mode
• Loopback Mode Facilitates Board Self Test Functions
• User Selectable RS-485 Data Rates (ISL3333 Only)
- Fast Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Mbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 115kbps
• Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 400kbps
• RS-232 Tx and Rx Enable Pins (ISL3333 Only)
Both RS-232 and RS-485 modes feature loopback and
shutdown functions. Loopback internally connects the Tx
outputs to the corresponding Rx input, to facilitate board
level self test implementation. The outputs remain connected
to the loads during loopback, so connection problems (e.g.,
shorted connectors or cables) can be detected. Shutdown
mode disables the Tx and Rx outputs, disables the charge
pumps, and places the IC in a low current (35µA) mode.
• Small Charge Pump Caps . . . . . . . . . . . . . . . . . 4 x 0.1µF
The ISL3333 is a QFN packaged device that includes two
additional user selectable, lower speed and edge rate
options for EMI sensitive designs, or to allow longer bus
lengths. It also features a logic supply pin (VL) that sets the
VOH level of logic outputs, and the switching points of logic
inputs, to be compatible with another supply voltage in mixed
voltage systems. The QFN also adds RS-232 mode Tx EN
pins (DEN), and active low Rx enable pins (RXEN) to
increase design flexibility. In RS-485 applications, active low
Rx enable pins allow Tx/Rx direction control, via a single
signal per port, by connecting the corresponding DE and
RXEN pins together.
• Gaming Applications (such as Slot Machines)
• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . .35µA
• QFN Package Saves Board Space (ISL3333 Only)
• Logic Supply Pin (VL) Eases Operation in Mixed Supply
Systems (ISL3333 Only)
Applications
• Single Board Computers
• Factory Automation
• Security Networks
• Industrial/Process Control Networks
• Level Translators (such as RS-232 to RS-422)
• Point of Sale Equipment
• Dual Channel RS-485 Interfaces
For a single port version of these devices, please see the
ISL3330, ISL3331 data sheet.
TABLE 1. SUMMARY OF FEATURES
NO. OF
PART NUMBER PORTS PACKAGE OPTIONS
RS-485 DATA
RATE (bps)
ISL3332
2
28 Ld SSOP
ISL3333
2
40 Ld QFN (6 x 6mm) 20M, 460k, 115k
FN6362 Rev 1.00
Jan 21, 2021
20M
RS-232 DATA
RATE (kbps) VL PIN?
RS-232 Tx
ENABLE?
ACTIVE H or L LOW POWER
Rx ENABLE? SHUTDOWN?
400
NO
NO
NONE
YES
400
YES
YES
L
YES
Page 1 of 27
ISL3332, ISL3333
Ordering Information
PART NUMBER
(Notes 2, 3)
PART MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(Units) (Note 1)
PACKAGE
(RoHS Compliant
PKG. DWG. #
ISL3332IAZ
3332 IAZ
-40 to +85
-
28 Ld SSOP
M28.209
ISL3332IAZ-T
3332 IAZ
-40 to +85
1k
28 Ld SSOP
M28.209
ISL3333IRZ
3333 IRZ
-40 to +85
-
40 Ld QFN
L40.6x6
ISL3333IRZ-T
3333 IRZ
-40 to +85
4k
40 Ld QFN
L40.6x6
ISL3333IRZ-T7A
3333 IRZ
-40 to +85
250
40 Ld QFN
L40.6x6
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 ISL3332, ISL3333 device pages. For more information about MSL, see TB363.
Pinouts
23 DZ1/DE1
Z1 7
VL
Y1 6
NC
24 RA1
NC
B1 5
VCC
25 RB1
C2-
A1 4
C2+
26 VCC
C1+
27 C2-
V+ 3
C1-
28 C2+
C1- 2
NC
C1+ 1
ISL3333 (40 LD QFN)
TOP VIEW
NC
ISL3332 (28 LD SSOP)
TOP VIEW
40
39
38
37
36
35
34
33
32
31
V+
1
30 RB1
A1
2
29 RA1
22 DY1
B1
3
28 DZ1/DE1
SEL1 8
21 LB
Y1
4
27 DY1
SEL2 9
20 ON/OFF
Z1
5
26 LB
SEL2
7
24 DY2
16 RB2
Z2
8
23 DZ2/DE2
Y2
9
22 RA2
B2
10
21 RB2
FN6362 Rev 1.00
Jan 21, 2021
15 V-
11
12
13
14
15
16
17
18
19
20
DEN2
GND 14
V-
17 RA2
A2 13
RXEN2
B2 12
RXEN1
25 ON/OFF
GND
6
GND
SEL1
SPB
18 DZ2/DE2
SPA
Y2 11
DEN1
19 DY2
A2
Z2 10
Page 2 of 27
ISL3332, ISL3333
TABLE 2. ISL3332 FUNCTION TABLE
INPUTS
RECEIVER OUTPUTS
DRIVER OUTPUTS
SEL1 or 2
ON/OFF
DE 1 or 2
RA
RB
Y
Z
CHARGE PUMPS
(Note 4)
MODE
0
1
N.A.
ON
ON
ON
ON
ON
RS-232
X
0
X
High-Z
High-Z
High-Z
High-Z
OFF
Shutdown
1
1
0
ON
High-Z *
High-Z
High-Z
OFF
RS-485
1
1
1
ON
High-Z *
ON
ON
OFF
RS-485
NOTE:
4. Charge pumps are off if SEL1 = SEL2 = 1, or if ON/OFF = 0. If ON = 1, and either port is programmed for RS-232 mode, then the charge pumps
are on.
ISL3332 Truth Tables (FOR EACH PORT)
RS-232 TRANSMITTING MODE
INPUTS
SEL1 or 2 ON/OFF
RS-485 TRANSMITTING MODE
OUTPUTS
DY
DZ
Y
Z
INPUTS
SEL1 or 2 ON/OFF
OUTPUTS
DE1 or 2
DY
Y
Z
0
1
0
0
1
1
1
1
1
0
1
0
0
1
0
1
1
0
1
1
1
1
0
1
0
1
1
0
0
1
1
1
0
X
High-Z
High-Z
0
1
1
1
0
0
1
0
X
X
High-Z
High-Z
0
0
X
X
High-Z
High-Z
RS-485 RECEIVING MODE
RS-232 RECEIVING MODE
INPUTS
SEL1 or 2 ON/OFF
INPUTS
OUTPUT
A
B
RA
RB
SEL1 or 2 ON/OFF
OUTPUT
B-A
RA
RB *
0
1
0
0
1
1
1
1
-40mV
1
High-Z
0
1
0
1
1
0
1
1
-200mV
0
High-Z
0
1
1
0
0
1
1
1
Open or Shorted together
1
High-Z
0
1
1
1
0
0
1
0
X
High-Z
High-Z
0
1
Open
Open
1
1
0
0
X
X
High-Z
High-Z
FN6362 Rev 1.00
Jan 21, 2021
* Internally pulled high through a 40kΩ resistor.
Page 3 of 27
ISL3332, ISL3333
TABLE 3. ISL3333 FUNCTION TABLE
INPUTS
SEL1 or 2 ON/OFF
SPA
SPB
RXEN 1
or 2
DEN 1
or 2 DE 1 or 2
RECEIVER
OUTPUTS
DRIVER
OUTPUTS
RA
RB
Y
Z
DRIVER
CHARGE DATA
RATE
PUMPS
(Note 5) (Mbps)
MODE
0
1
X
X
0
0
N.A.
ON
ON
High-Z
High-Z
ON
0.46
RS-232
0
1
X
X
0
1
N.A.
ON
ON
ON
ON
ON
0.46
RS-232
0
1
X
X
1
0
N.A.
High-Z
High-Z
High-Z
High-Z
ON
0.46
RS-232
0
1
X
X
1
1
N.A.
High-Z
High-Z
ON
ON
ON
0.46
RS-232
High-Z
X
0
X
X
X
X
X
High-Z
High-Z
High-Z
OFF
N.A.
Shutdown
1
1
X
X
0
N.A.
0
ON
High-Z * High-Z
High-Z
OFF
N.A.
RS-485
1
1
0
0
0
N.A.
1
ON
High-Z *
ON
ON
OFF
0.46
RS-485
1
1
0
1
0
N.A.
1
ON
High-Z *
ON
ON
OFF
0.115
RS-485
1
1
1
0
0
N.A.
1
ON
High-Z *
ON
ON
OFF
20
RS-485
1
1
1
1
0
N.A.
1
ON
High-Z *
ON
1
1
X
X
1
N.A.
0
High-Z High-Z * High-Z
1
1
0
0
1
N.A.
1
High-Z High-Z *
1
1
0
1
1
N.A.
1
1
1
1
0
1
N.A.
1
1
1
1
1
1
N.A.
1
ON
OFF
20
RS-485
High-Z
OFF
N.A.
RS-485
ON
ON
OFF
0.46
RS-485
High-Z High-Z *
ON
ON
OFF
0.115
RS-485
High-Z High-Z *
ON
ON
OFF
20
RS-485
High-Z High-Z *
ON
ON
OFF
20
RS-485
NOTE:
5. Charge pumps are off if SEL1 = SEL2 = 1, or if ON/OFF = 0. If ON = 1, and either port is programmed for RS-232 mode, then the charge pumps
are on.
ISL3333 Truth Tables (FOR EACH PORT)
RS-485 TRANSMITTING MODE
RS-232 TRANSMITTING MODE
INPUTS
SEL1 or 2 ON/OFF DEN1 or 2
OUTPUTS
DY
DZ
Y
Z
0
1
1
0
0
1
1
0
1
1
0
1
1
0
0
1
1
1
0
0
1
0
1
1
1
1
0
0
0
1
0
X
X
High-Z High-Z
0
0
X
X
X
High-Z High-Z
SEL1 ON/
DE
or 2 OFF 1 or 2 SPA SPB
RXEN 1
or 2
SEL1 or 2 ON/OFF
DATA
RATE
DY
Y
Z
Mbps
1
1
1
0
0
0/1
1/0
0/1
0.46
1
1
1
0
1
0/1
1/0
0/1
0.115
1
1
1
1
X
0/1
1/0
0/1
20
1
1
0
X
X
X
High-Z High-Z
N.A.
1
0
X
X
X
X
High-Z High-Z
N.A.
RS-485 RECEIVING MODE
RS-232 RECEIVING MODE
INPUTS
OUTPUTS
INPUTS
INPUTS
OUTPUT
A
B
RA
RB
OUTPUT
SEL1
or 2
ON/OFF
RXEN 1
or 2
B-A
RA
RB *
1
1
0
-40mV
1
High-Z
0
1
0
0
0
1
1
0
1
0
0
1
1
0
1
1
0
-200mV
0
High-Z
0
1
0
1
0
0
1
1
1
0
1
High-Z
0
1
0
1
1
0
0
Open or Shorted
together
0
1
0
Open
Open
1
1
1
1
1
X
High-Z High-Z
0
1
1
X
X
High-Z High-Z
1
0
X
X
High-Z High-Z
0
0
X
X
X
High-Z High-Z
FN6362 Rev 1.00
Jan 21, 2021
* Internally pulled high through a 40k resistor.
Page 4 of 27
ISL3332, ISL3333
Pin Descriptions
PIN
MODE
FUNCTION
GND
BOTH
Ground connection.
LB
BOTH
Enables loopback mode when low. Internally pulled-high.
NC
BOTH
No Connection.
ON/OFF
BOTH
If either port is in RS-232 mode, a low on ON/OFF disables the charge pumps. In either mode, a low disables all the outputs,
and places the device in low power shutdown. Internally pulled-high. ON = 1 for normal operation.
RXEN
BOTH
Active low receiver output enable. The corresponding port’s Rx is enabled when RXEN is low; Rx is high impedance when
RXEN is high. Internally pulled low. (QFN only)
SEL
BOTH
Interface Mode Select input. High puts corresponding port in RS-485 Mode, while a low puts it in RS-232 Mode.
VCC
BOTH
System power supply input (3.3V).
VL
BOTH
Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. QFN logic input pins that are externally
tied high in an application, should use the VL supply for the high voltage level. (QFN only)
DEN
A
RS-232 Active high driver output enable. The corresponding port’s 232 mode drivers are enabled when DEN is high; drivers are
disabled when DEN is low. Internally pulled high. (QFN only).
RS-232 Receiver input with 15kV ESD protection. A low on A forces RA high; A high on A forces RA low.
RS-485 Inverting receiver input with 15kV ESD protection.
B
RS-232 Receiver input with 15kV ESD protection. A low on B forces RB high; A high on B forces RB low.
RS-485 Noninverting receiver input with 15kV ESD protection.
DY
RS-232 Driver input. A low on DY forces output Y high. Similarly, a high on DY forces output Y low.
RS-485 Driver input. A low on DY forces output Y high and output Z low. Similarly, a high on DY forces output Y low and output Z high.
DZ / DE
RS-232 Driver input. A low on DZ forces output Z high. Similarly, a high on DZ forces output Z low.
RS-485 Driver output enable (DE). The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when
DE is low. Internally pulled high when port selected for RS-485 mode.
RA
RS-232 Receiver output.
RS-485 Receiver output: If B > A by at least -40mV, RA is high; If B < A by -200mV or more, RA is low; RA = High if A and B are
unconnected (floating) or shorted together (i.e., full fail-safe).
RB
RS-232 Receiver output.
RS-485 Not used. Internally pulled-high, and unaffected by RXEN.
Y
RS-232 Driver output with 15kV ESD protection.
RS-485 Inverting driver output with 15kV ESD protection.
Z
RS-232 Driver output with 15kV ESD protection.
RS-485 Noninverting driver output with 15kV ESD protection.
SP
RS-485 Speed control. Internally pulled-high. (QFN only)
C1+
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 Mode.
C1-
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 Mode.
C2+
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 Mode.
C2-
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 Mode.
V+
RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed if both ports in RS-485 Mode.
V-
RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed if both ports in RS-485 Mode.
FN6362 Rev 1.00
Jan 21, 2021
Page 5 of 27
ISL3332, ISL3333
Typical Operating Circuits
RS-232 MODE WITHOUT LOOPBACK
+3.3V
+3.3V
+
C1
0.1µF
+
C2
0.1µF
+
RS-232 MODE WITH LOOPBACK
0.1F
1
2
28
27
C1+
VCC
C2+
3
V- 15
C2-
24
R
5k
5
B1
V+
C1-
4
A1
+
0.1µF
26
C4
0.1µF
+
RA1
25 RB1
R
5k
+ C3
0.1µF
C1
0.1µF
+
C2
0.1µF
+
1
2
28
27
26
C1+
V- 15
7
Z1
22
D
23
D
DEN1
VCC
(QFN ONLY)
8
LB
ON/OFF
SEL1
DY1
DZ1
21
VCC
20
5
5k
6
Y1
7
Z1
VCC
VCC
SEL1
C2
0.1µF
+
1
2
28
27
C1+
V+
C1C2+
3
V- 15
C2-
4
A1
B1
24
R
5
RS-485 MODE WITH LOOPBACK
+ C3
0.1µF
C4
0.1µF
+
+
C1
0.1µF
+
C2
0.1µF
+
A1
RA1
B1
0.1µF
1
2
28
27
C1+
25
22
D
7
23
8
VCC
V- 15
C2-
4
24
R
5
RB1
25
DY1
Y1
DE1
LB
ON/OFF
SEL1
GND
14
NOTE: PINOUT FOR SSOP
SAME FOR PORT 2.
FN6362 Rev 1.00
Jan 21, 2021
3
V+
+ C3
0.1µF
C4
0.1µF
+
RA1
LB
Rx
Z1
VCC
VCC
RXEN1
6
Z1
26
C1C2+
(QFN ONLY)
Y1
VCC
NOTE: PINOUT FOR SSOP
SAME FOR PORT 2.
26
VCC
20
ON/OFF
14
+3.3V
+
GND
GND
RS-485 MODE WITHOUT LOOPBACK
C1
0.1µF
DZ1
21
LB
(QFN ONLY)
8
DY1
23
D
DEN1
NOTE: PINOUT FOR SSOP
SAME FOR PORT 2.
0.1µF
RB1
22
D
14
+
25
R
LB
Rx
GND
+3.3V
RA1
5k
B1
C4
0.1µF
+
24
R
RXEN1
6
+ C3
0.1µF
C2-
(QFN ONLY)
Y1
3
V+
C1C2+
4
A1
VCC
21
20
VCC
VCC
VCC
VCC
6
D
7
23
8
22
DE1
21
LB
ON/OFF
SEL1
20
RB1
DY1
GND
VCC
GND
14
NOTE: PINOUT FOR SSOP
SAME FOR PORT 2.
Page 6 of 27
ISL3332, ISL3333
Absolute Maximum Ratings (TA = +25°C)
Thermal Information
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
VL (QFN Only) . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VCC + 0.5V
Input Voltages
All Except A,B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
Input/Output Voltages
A, B (Any Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25V to +25V
Y, Z (Any Mode, Note 6) . . . . . . . . . . . . . . . . . . . -12.5V to +12.5V
RA, RB (non-QFN Package). . . . . . . . . . . . -0.5V to (VCC + 0.5V)
RA, RB (QFN Package) . . . . . . . . . . . . . . . . -0.5V to (VL + 0.5V)
Output Short Circuit Duration
Y, Z, RA, RB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
60
N/A
28 Ld SSOP Package (Note 8) . . . . . .
40 Ld QFN Package (Notes 7, 9). . . . .
31
2.5
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum Storage Temperature Range. . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
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:
6. One output at a time, IOUT 100mA for 10 mins.
7. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with direct attach features. See
TB379.
8. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See TB379 for details.
9. For JC, the case temperature location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
Test Conditions: VCC = 3.15V to 3.45V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); Unless Otherwise Specified.
Typicals are at VCC = 3.3V, TA =+25°C (Note 10)
SYMBOL
TEST CONDITIONS
TEMP
MIN
(°C) (Note 14)
TYP
MAX
(Note 14) UNITS
DC CHARACTERISTICS - RS-485 DRIVER (SEL = VCC)
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
Full
-
-
VCC
V
R = 50 (RS-422) (Figure 1)
Full
2
2.3
-
V
R = 27 (RS-485) (Figure 1)
Full
1.5
2
5
V
VOD3
RD = 60, R = 375, VCM = -7V to 12V
(Figure 1)
Full
1.5
-
5
V
VOD
R = 27 or 50 (Figure 1)
Full
-
0.01
0.2
V
VOC
R = 27 or 50 (Figure 1)
Full
-
-
3.0
V
VOC
R = 27 or 50 (Figure 1)
Full
-
0.01
0.2
V
Full
35
-
250
mA
Driver Short-Circuit Current,
VOUT = High or Low
IOS
-7V (VY or VZ) 12V (Note 8)
Driver Three-State Output
Leakage Current (Y, Z)
IOZ
Outputs Disabled,
VCC = 0V or 3.6V
VOUT = 12V
Full
-
-
200
µA
VOUT = -7V
Full
-200
-
-
µA
DC CHARACTERISTICS - RS-232 DRIVER (SEL = GND)
Driver Output Voltage Swing
VO
All TOUTS Loaded with 3k to Ground
Full
±5.0
-
-
V
Driver Output Short-Circuit Current
IOS
VOUT = 0V
Full
-60
-
60
mA
DC CHARACTERISTICS - LOGIC PINS (i.e., DRIVER AND CONTROL INPUT PINS)
Input High Voltage
FN6362 Rev 1.00
Jan 21, 2021
VIH1
VL = VCC if QFN
Full
2.2
-
-
V
VIH2
2.7V VL < 3.0V (QFN Only)
Full
2
-
-
V
VIH3
2.3V VL < 2.7V (QFN Only)
Full
1.6
-
-
V
VIH4
1.6V VL < 2.3V (QFN Only)
Full
0.7*VL
-
-
V
VIH5
1.2V VL < 1.6V (QFN Only)
25
-
0.7*VL
-
V
Page 7 of 27
ISL3332, ISL3333
Electrical Specifications
PARAMETER
Input Low Voltage
Input Current
Test Conditions: VCC = 3.15V to 3.45V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); Unless Otherwise Specified.
Typicals are at VCC = 3.3V, TA =+25°C (Note 10) (Continued)
SYMBOL
TEST CONDITIONS
TEMP
MIN
(°C) (Note 14)
MAX
(Note 14) UNITS
TYP
VIL1
VL = VCC if QFN
Full
-
-
0.8
V
VIL2
VL 2.7V (QFN Only)
Full
-
-
0.8
V
VIL3
2.3V VL < 2.7V (QFN Only)
Full
-
-
0.7
V
VIL4
1.6V VL < 2.3V (QFN Only)
Full
-
-
0.35*VL
V
VIL5
1.3V VL < 1.6V (QFN Only)
25
-
0.35*VL
-
V
VIL6
1.2V VL < 1.3V (QFN Only)
25
-
0.25*VL
-
V
IIN1
Pins Without Pull-ups or Pull-downs
Full
-2
-
2
µA
IIN2
LB, ON/OFF, DE (SP, RXEN, DEN, if QFN)
Full
-25
-
25
µA
Full
-0.2
-
-0.04
V
DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (SEL = VCC)
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
VTH
VTH
-7V VCM 12V, Full Failsafe
VCM = 0V
Receiver Input Current (A, B)
IIN
VCC = 0V or 3.0 to 3.6V
Receiver Input Resistance
RIN
-7V VCM 12V, VCC = 0 (Note 9) or
3.0V VCC 3.6V
VIN = 12V
VIN = -7V
25
-
35
-
mV
Full
-
-
0.8
mA
Full
-0.64
-
-
mA
Full
15
-
-
k
VIN
Full
-25
-
25
V
DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (SEL = GND)
Receiver Input Voltage Range
Receiver Input Threshold
VIL
Full
-
1.1
0.8
V
VIH
Full
2.4
1.6
-
V
Receiver Input Hysteresis
VTH
25
-
0.5
-
V
Receiver Input Resistance
RIN
Full
3
5
7
k
Full
VCC-0.4
-
-
V
VIN = 15V, VCC Powered Up (Note 9)
DC CHARACTERISTICS - RECEIVER OUTPUTS (485 OR 232 MODE)
Receiver Output High Voltage
VOH1
IO = -1.5mA (VL = VCC if QFN)
VOH2
IO = -100µA, VL 1.2V (QFN Only)
Full
VL-0.1
-
-
V
VOH3
IO = -500µA, VL = 1.5V (QFN Only)
Full
1.2
-
-
V
VOH4
IO = -150µA, VL = 1.2V (QFN Only)
Full
1.0
-
-
V
Receiver Output Low Voltage
VOL
IO = 5mA
Full
-
0.2
0.4
V
Receiver Short-Circuit Current
IOSR
0V VO VCC
Full
7
-
85
mA
Receiver Three-State Output
Current
IOZR
Output Disabled, 0V VO VCC (or VL for
QFN)
Full
-
-
10
µA
Unused Receiver (RB) Pull-Up
Resistance
ROBZ
ON/OFF = VCC, SELX = VCC (RS-485 Mode)
25
-
40
-
k
ICC232
SEL1 or SEL2 = GND, LB = ON/OFF = VCC
Full
-
3.7
7
mA
ICC485
SEL 1 & 2 = LB = DE = ON/OFF = VCC
Full
-
1.6
5
mA
Full
-
45
100
µA
SSOP
Full
-
35
80
µA
QFN
Full
-
60
160
µA
15
-
kV
POWER SUPPLY CHARACTERISTICS
No-Load Supply Current, (Note 7)
Shutdown Supply Current
ISHDN232 ON/OFF = SELX = GND, LB = VCC,
(SPX = VL, DENX = GND if QFN)
ISHDN485 ON/OFF = DEX = GND, SELX
= LB = VCC, (SPX = GND,
DENX = VL if QFN)
ESD CHARACTERISTICS
Bus Pins (A, B, Y, Z) Any Mode
Human Body Model
25
-
All Other Pins
Human Body Model
25
-
2.5
-
kV
Machine Model
25
-
200
-
V
FN6362 Rev 1.00
Jan 21, 2021
Page 8 of 27
ISL3332, ISL3333
Electrical Specifications
PARAMETER
Test Conditions: VCC = 3.15V to 3.45V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); Unless Otherwise Specified.
Typicals are at VCC = 3.3V, TA =+25°C (Note 10) (Continued)
SYMBOL
TEST CONDITIONS
TEMP
MIN
(°C) (Note 14)
TYP
MAX
(Note 14) UNITS
RS-232 DRIVER AND RECEIVER SWITCHING CHARACTERISTICS (SEL = GND, ALL VERSIONS AND SPEEDS)
Driver Output Transition Region
Slew Rate
Driver Output Transition Time
Driver Propagation Delay
SR
tr, tf
tDPHL
CL 15pF
Full
-
20
30
V/µs
CL 2500pF
Full
4
9
-
V/µs
RL = 3k, CL = 2500pF, 10% - 90%
Full
0.22
1.2
3.1
µs
RL = 3kCL = 1000pF (Figure 6)
Full
-
1
2
µs
Full
-
1.2
2
µs
RL = 3kMeasured From
3V to -3V or -3V to 3V
tDPLH
Driver Propagation Delay Skew
tDSKEW
tDPHL - tDPLH (Figure 6)
Full
-
300
450
ns
Driver Enable Time (QFN Only)
tDEN
CL = 1000pF
25
-
1500
-
ns
Driver Disable Time (QFN Only)
tDDIS
RL = 5kMeasured at VOUT = ±3V,
CL = 30pF
25
-
500
-
ns
VOUT = 3.0V, CL = 1000pF
25
-
25
-
µs
Full
250
400
-
kbps
Driver Enable Time from Shutdown
tDENSD
Driver Maximum Data Rate
DRD
RL = 3kCL = 500pF, One Transmitter
Switching on Each Port
Receiver Propagation Delay
tRPHL
CL = 15pF (Figure 7)
tRPLH
Receiver Propagation Delay Skew
tRSKEW
tRPHL - tRPLH (Figure 7)
Full
-
40
120
ns
Full
-
58
120
ns
Full
-
18
40
ns
Receiver Maximum Data Rate
DRR
CL = 15pF
Full
0.46
2
-
Mbps
Receiver Enable to Output Low
tZL
QFN Only, CL = 15pF, SW = VCC
Full
-
18
-
ns
Receiver Enable to Output High
tZH
QFN Only, CL = 15pF, SW = GND
Full
-
18
-
ns
Receiver Disable from Output Low
tLZ
QFN Only, CL = 15pF, SW = VCC
Full
-
22
-
ns
Receiver Disable from Output High
tHZ
QFN Only, CL = 15pF, SW = GND
Full
-
22
-
ns
Receiver Enable from Shutdown to
Output Low
tZLSHDN
CL = 15pF, SW = VCC
25
-
60
-
ns
Receiver Enable from Shutdown to
Output High
tZHSHDN
CL = 15pF, SW = GND
25
-
20
-
ns
RS-485 DRIVER SWITCHING CHARACTERISTICS (FAST DATA RATE (20Mbps), SEL = VCC, ALL VERSIONS (SPA = VCC if QFN))
Driver Differential Input to Output
Delay
Driver Output Skew
Driver Differential Rise or Fall Time
tDLH, tDHL RDIFF = 54, CL = 100pF (Figure 2)
Full
tSKEW
RDIFF = 54, CL = 100pF (Figure 2)
Full
-
2
10
ns
tR, tF
RDIFF = 54, CL = 100pF, (Figure 2)
Full
3
20
30
ns
10
20
35
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 3)
Full
-
28
60
ns
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 3)
Full
-
35
60
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 3)
Full
-
30
60
ns
tHZ
Driver Disable from Output High
CL = 15pF, SW = GND (Figure 3)
Full
-
30
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN) RL = 500, CL = 100pF, SW = VCC (Figure 3)
Full
-
100
250
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN) RL = 500, CL = 100pF, SW = GND (Figure 3)
Full
-
290
375
ns
Full
20
35
-
Mbps
Driver Maximum Data Rate
fMAX
RDIFF = 54, CL = 100pF (Figure 2)
RS-485 DRIVER SWITCHING CHARACTERISTICS (MEDIUM DATA RATE (460kbps, QFN ONLY), SEL = VCC, SPA = SPB= GND)
Driver Differential Input to Output
Delay
Driver Output Skew
Driver Differential Rise or Fall Time
Driver Enable to Output Low
FN6362 Rev 1.00
Jan 21, 2021
tDLH, tDHL RDIFF = 54, CL = 100pF (Figure 2)
Full
200
500
1000
ns
tSKEW
RDIFF = 54, CL = 100pF (Figure 2)
Full
-
10
150
ns
tR, tF
RDIFF = 54, CL = 100pF (Figure 2)
Full
300
660
1100
ns
CL = 100pF, SW = VCC (Figure 3)
Full
-
42
100
ns
tZL
Page 9 of 27
ISL3332, ISL3333
Electrical Specifications
PARAMETER
Test Conditions: VCC = 3.15V to 3.45V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); Unless Otherwise Specified.
Typicals are at VCC = 3.3V, TA =+25°C (Note 10) (Continued)
SYMBOL
TEST CONDITIONS
TEMP
MIN
(°C) (Note 14)
MAX
(Note 14) UNITS
TYP
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 3)
Full
-
350
450
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 3)
Full
-
30
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 3)
Full
-
30
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN) RL = 500, CL = 100pF, SW = VCC (Figure 3)
Full
-
-
500
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN) RL = 500, CL = 100pF, SW = GND (Figure 3)
Full
-
-
750
ns
Full
460
2000
-
kbps
Driver Maximum Data Rate
fMAX
RDIFF = 54, CL = 100pF (Figure 2)
RS-485 DRIVER SWITCHING CHARACTERISTICS (SLOW DATA RATE (115kbps, QFN ONLY), SEL = VCC, SPA = GND, SPB= VCC)
Driver Differential Input to Output
Delay
Driver Output Skew
Driver Differential Rise or Fall Time
tDLH, tDHL RDIFF = 54, CL = 100pF (Figure 2)
Full
800
1600
2500
ns
tSKEW
RDIFF = 54, CL = 100pF (Figure 2)
Full
-
250
500
ns
tR, tF
RDIFF = 54, CL = 100pF (Figure 2)
Full
1000
1700
3100
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 3)
Full
-
45
100
ns
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 3)
Full
-
900
1200
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 3)
Full
-
35
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 3)
Full
-
25
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN) RL = 500, CL = 100pF, SW = VCC (Figure 3)
Full
-
-
800
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN) RL = 500, CL = 100pF, SW = GND (Figure 3)
Full
-
-
1500
ns
Full
115
800
-
kbps
Driver Maximum Data Rate
fMAX
RDIFF = 54, CL = 100pF (Figure 2)
RS-485 RECEIVER SWITCHING CHARACTERISTICS (SEL = VCC, ALL VERSIONS AND SPEEDS)
Receiver Input to Output Delay
tPLH, tPHL (Figure 4)
Full
20
45
70
ns
(Figure 4)
Full
-
3
10
ns
Full
20
40
-
Mbps
tZL
QFN Only, CL = 15pF, SW = VCC (Figure 5)
Full
-
20
60
ns
tZH
QFN Only, CL = 15pF, SW = GND (Figure 5)
Full
-
20
60
ns
Receiver Skew | tPLH - tPHL |
tSKEW
Receiver Maximum Data Rate
fMAX
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Output Low
tLZ
QFN Only, CL = 15pF, SW = VCC (Figure 5)
Full
-
20
60
ns
Receiver Disable from Output High
tHZ
QFN Only, CL = 15pF, SW = GND (Figure 5)
Full
-
20
60
ns
Receiver Enable from Shutdown to
Output Low
tZLSHDN
CL = 15pF, SW = VCC (Figure 5)
Full
-
500
900
ns
Receiver Enable from Shutdown to
Output High
tZHSHDN
CL = 15pF, SW = GND (Figure 5)
Full
-
500
900
ns
NOTES:
10. 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.
11. Supply current specification is valid for loaded drivers when DE = 0V (RS-485 mode) or DEN = 0V (RS-232 mode).
12. Applies to peak current. See “Typical Performance Curves” for more information.
13. RIN defaults to RS-485 mode (>15k) when the device is unpowered (VCC = 0V), or in SHDN, regardless of the state of the SEL inputs.
14. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
FN6362 Rev 1.00
Jan 21, 2021
Page 10 of 27
ISL3332, ISL3333
Test Circuits and Waveforms
R
VCC
DE
DY
Y
RD
D
VOD
Z
VOC
R
FIGURE 1. RS-485 DRIVER VOD AND VOC TEST CIRCUIT
3V
DY
VCC
1.5V
0V
CL = 100pF
DE
DY
1.5V
tPLH
tPHL
VOH
Y
RDIFF
D
Z
50%
OUT (Z)
50%
VOL
CL = 100pF
tPLH
tPHL
SIGNAL
GENERATOR
VOH
OUT (Y)
50%
50%
VOL
tDLH
90%
DIFF OUT (Z - Y)
10%
tDHL
0V
0V
10%
tR
FIGURE 2A. TEST CIRCUIT
+VOD
90%
-VOD
tF
SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FN6362 Rev 1.00
Jan 21, 2021
Page 11 of 27
ISL3332, ISL3333
Test Circuits and Waveforms (Continued)
DE
Y
DY
500
VCC
D
SIGNAL
GENERATOR
SW
Z
GND
ENABLED
DE
(ON/OFF FOR SHDN)
3V
1.5V
1.5V
0V
CL
tZH
tZH(SHDN)
OUTPUT HIGH
OUT (Y, Z)
FOR SHDN TESTS, SWITCH ON/OFF RATHER THAN DE
PARAMETER
ON/DE
OUTPUT
DY
SW
tHZ
1/-
Y/Z
0/1
GND
15
tLZ
1/-
Y/Z
1/0
VCC
15
tZH
1/-
Y/Z
0/1
GND
100
tZL
1/-
Y/Z
1/0
VCC
100
tZH(SHDN)
-/1
Y/Z
0/1
GND
100
tZL(SHDN)
-/1
Y/Z
1/0
VCC
100
tHZ
VOH - 0.5V VOH
2.3V
0V
CL (pF)
tZL
tZL(SHDN)
tLZ
VCC
OUT (Y, Z)
2.3V
OUTPUT LOW
VOL + 0.5V V
OL
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3A. TEST CIRCUIT
FIGURE 3. RS-485 DRIVER ENABLE AND DISABLE TIMES
RXEN (QFN ONLY)
0V
+1.5V
15pF
A
RA
R
B
B
0V
0V
-1.5V
tPLH
tPHL
VCC
SIGNAL
GENERATOR
RA
1.5V
1.5V
0V
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4A. TEST CIRCUIT
FIGURE 4. RS-485 RECEIVER PROPAGATION DELAY
RXEN (QFN ONLY)
A
R
SIGNAL
GENERATOR
1k
RA
VCC
SW
B
ON/OFF
(FOR SHDN TESTS)
0V
ENABLED
GND
15pF
3V
1.5V
3V
RXEN (QFN ONLY)
1.5V
1.5V
0V
FOR SHDN TESTS, SWITCH ON/OFF RATHER THAN RXEN
PARAMETER
ON/RXEN
B
SW
tHZ (QFN Only)
1/-
+1.5V
GND
tLZ (QFN Only)
1/-
-1.5V
VCC
tZH (QFN Only)
1/-
+1.5V
GND
tZL (QFN Only)
1/-
-1.5V
VCC
tZH(SHDN)
-/0
+1.5V
GND
tZL(SHDN)
-/0
-1.5V
VCC
FIGURE 5A. TEST CIRCUIT
tZH
tZH(SHDN)
OUTPUT HIGH
RA
tHZ
VOH - 0.5V VOH
1.5V
0V
tZL
tZL(SHDN)
RA
tLZ
VCC
1.5V
OUTPUT LOW
VOL + 0.5V V
OL
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RS-485 RECEIVER ENABLE AND DISABLE TIMES
FN6362 Rev 1.00
Jan 21, 2021
Page 12 of 27
ISL3332, ISL3333
Test Circuits and Waveforms (Continued)
VCC
3V
DEN (QFN ONLY)
DY,Z
D
DY,Z
1.5V
1.5V
CL
Y, Z
0V
tDPHL
RL
SIGNAL
GENERATOR
tDPLH
VO+
OUT (Y,Z)
0V
0V
VO-
SKEW = |tDPHL - tDPLH|
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6A. TEST CIRCUIT
FIGURE 6. RS-232 DRIVER PROPAGATION DELAY AND TRANSITION TIMES
3V
RXEN (QFN ONLY)
A, B
R
RA, RB
SIGNAL
GENERATOR
A, B
50%
50%
CL = 15pF
0V
tRPLH
tRPHL
VOH
RA, RB
50%
50%
VOL
SKEW = |tRPHL - tRPLH|
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RS-232 RECEIVER PROPAGATION DELAY AND TRANSITION TIMES
FN6362 Rev 1.00
Jan 21, 2021
Page 13 of 27
ISL3332, ISL3333
Typical Application
Detailed Description
RS-232 to RS-485 Converter
Each of the two ISL333X ports supports dual protocols:
RS-485/422, and RS-232. RS-485 and RS-422 are differential
(balanced) data transmission standards for use in high speed
(up to 20Mbps) networks, or long haul and noisy
environments. The differential signaling, coupled with
RS-485’s requirement for an extended common mode range
(CMR) of +12V to -7V make these transceivers extremely
tolerant of ground potential differences, as well as voltages
induced in the cable by external fields. Both of these effects
are real concerns when communicating over the RS-485/422
maximum distance of 4000’ (1220m). It is important to note
that the ISL333X don’t follow the RS-485 convention
whereby the inverting I/O is labeled “B/Z”, and the non
inverting I/O is “A/Y”. Thus, in the application diagrams
below the 333X A/Y (B/Z) pins connect to the B/Z (A/Y)
pins of the generic RS-485/RS-422 ICs.
The ISL3332, ISL3333 are ideal for implementing a single IC
2-wire (Tx Data, Rx Data) protocol converter, because each
port can be programmed for a different protocol. Figure 8
illustrates the simple connections to create a single
transceiver RS-232 to RS-485 converter. Depending on the
RS-232 data rate, using an RS-422 bus as an RS-232
“extension cord” can extend the transmission distance up to
4000’ (1220m). A similar circuit on the other end of the cable
completes the conversion to/from RS-232.
+3.3V
+ 0.1µF
C1
0.1µF
+
1
26
C1+
C2
0.1µF
2
C128
C2+
+
27
C2-
NC
4 A1
TxD
RS-232 IN
5 B1
VCC
V- 15
R
5k
R
5k
6 Y1
NC
RxD
RS-232 OUT
D
7 Z1
8
VCC
9
D
C4
0.1µF
+
RA1 24
NC
RS-422 is typically a point-to-point (one driver talking to one
receiver on a bus), or a point-to-multipoint (multidrop)
standard that allows only one driver and up to 10 receivers
on each bus. Because of the one driver per bus limitation,
RS-422 networks use a two bus, full duplex structure for
bidirectional communication, and the Rx inputs and Tx
outputs (no tri-state required) connect to different busses, as
shown in Figure 10.
RB1 25
DY1 22
DZ1 23
11
Y2
10
Z2
20
ON/OFF
SEL2
R
12 B2
RS-485 OUT
+C3
0.1µF
SEL1
13 A2
RS-485 IN
3
V+
D
Conversely, RS-485 is a true multipoint standard, which
allows up to 32 devices (any combination of drivers- must be
tri-statable - and receivers) on each bus. Now bidirectional
communication takes place on a single bus, so the Rx inputs
and Tx outputs of a port connect to the same bus lines, as
shown in Figure 9. Each port set to RS-485 /422 mode
includes one Rx and one Tx.RS-232 is a point-to-point,
singled ended (signal voltages referenced to GND)
communication protocol targeting fairly short (
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