DATASHEET
ISL81334, ISL41334
FN6202
Rev.4.01
Oct 24, 2019
±15kV ESD Protected, Two Port, Dual Protocol Transceivers
The ISL81334 and ISL41334 are two-port interface ICs in
which each port can be independently configured as a single
RS-485, RS-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.
Features
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 4.5V. Four small 0.1µF capacitors
are required for the charge pump. The transceivers are RS-232
compliant, with the Rx inputs handling up to ±25V, and the Tx
outputs handling ±12V.
• Flow-through pinouts simplify board layouts
• ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
• Two independent ports, each user selectable for RS-232
(2 transceivers) or RS-485, RS-422 (1 transceiver)
• Single 5V (10% tolerance) supply
• Pb-Free (RoHS compliant)
• Large (2.7V) differential VOUT for improved noise immunity
in RS-485, RS-422 networks
• Full fail-safe (open/short) Rx in RS-485, RS-422 mode
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.
• Loopback mode facilitates board self-test functions
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 (such as
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 (µA) mode.
• QFN package saves board space (ISL41334 only)
The ISL41334 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 active low Rx enable pins to
increase design flexibility, allowing Tx/Rx direction control,
through a single signal per port, by connecting the
corresponding DE and RXEN pins together.
• Factory automation
For a single port version of these devices, please see the
ISL81387, ISL41387 datasheet.
FN6202 Rev.4.01
Oct 24, 2019
• User selectable RS-485 data rates (ISL41334 only)
- Fast speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Mbps
- Slew rate limited . . . . . . . . . . . . . . . . . . . . . . . . . . . 460kbps
- Slew rate limited . . . . . . . . . . . . . . . . . . . . . . . . . . . 115kbps
• Fast RS-232 data rate . . . . . . . . . . . . . . . . . . . . up to 650kbps
• Low current Shutdown mode . . . . . . . . . . . . . . . . . . . . . . 42µA
• Logic supply pin (VL) eases operation in mixed supply
systems (ISL41334 only)
Applications
• Gaming applications (such as, slot machines)
• Single board computers
• Security networks
• Industrial/process control networks
• Level translators, such as RS-232 to RS-422
• Point of sale equipment
• Dual channel RS-485 interfaces
Related Literature
For a full list of related documents, visit our website:
• ISL81334, ISL41334 device pages
Page 1 of 33
ISL81334, ISL41334
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ISL81334 Truth Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ISL41334 Truth Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Operating Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Test Circuits and Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Typical Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
RS-232 to RS-485 Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
ISL81334 and ISL41334 Advantages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
RS-232 Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rx Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tx Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charge Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Rates and Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
18
18
18
18
RS-485 Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rx Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tx Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Rate, Cables, and Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Small Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flow Through Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Power Shutdown (SHDN) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Loopback Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
18
19
19
19
19
20
20
20
20
ISL41334 (QFN Package) Special Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Supply (VL Pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Active Low Rx Enable (RXEN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-485 Slew Rate Limited Data Rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
20
21
21
Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Die Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
FN6202 Rev.4.01
Oct 24, 2019
Page 2 of 33
ISL81334, ISL41334
TABLE 1. SUMMARY OF FEATURES
PART NUMBER
NO. OF
PORTS
PACKAGE OPTIONS
RS-485 DATA
RATE (bps)
RS-232 DATA
RATE (kbps)
VL PIN?
ACTIVE H or L
Rx ENABLE?
LOW POWER
SHUTDOWN?
ISL81334
2
28 Ld SOIC, 28 Ld SSOP
20M
650
NO
NONE
YES
ISL41334
2
40 Ld QFN (6mmx6mm)
20M, 460k, 115k
650
YES
L
YES
Ordering Information
PART NUMBER
(Notes 2, 3)
PART
MARKING
TEMP.
RANGE (°C)
TAPE AND REEL
(UNITS) (Note 1)
PACKAGE
(RoHS COMPLIANT)
PKG.
DWG. #
ISL81334IAZ
81334 IAZ
-40 to +85
-
28 Ld SSOP
M28.209
ISL81334IAZ-T
81334 IAZ
-40 to +85
1k
28 Ld SSOP
M28.209
ISL81334IBZ
ISL81334IBZ
-40 to +85
-
28 Ld SOIC
M28.3
ISL81334IBZ-T
ISL81334IBZ
-40 to +85
1k
28 Ld SOIC
M28.3
ISL41334IRZ
41334 IRZ
-40 to +85
-
40 Ld QFN
L40.6x6
ISL41334IRZ-T
41334 IRZ
-40 to +85
4k
40 Ld QFN
L40.6x6
ISL41334IRZ-T7A
41334 IRZ
-40 to +85
250
40 Ld QFN
L40.6x6
ISL41334EVAL1Z
Evaluation board
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 ISL81334, ISL41334 device pages. For more information about MSL, see TB363.
FN6202 Rev.4.01
Oct 24, 2019
Page 3 of 33
ISL81334, ISL41334
Pin Configurations
ISL41334
(40 LD QFN)
TOP VIEW
C1+ 1
28 C2+
NC
NC
C1-
C1+
C2+
C2-
VCC
NC
NC
VL
ISL81334
(28 LD SOIC, 28 LD SSOP)
TOP VIEW
C1- 2
27 C2-
40
39
38
37
36
35
34
33
32
31
V+ 3
26 VCC
A1 4
25 RB1
B1 5
Y1 6
Z1 7
22 DY1
V+
1
30 RB1
24 RA1
A1
2
29 RA1
23 DZ1/DE1
B1
3
28 DZ1/DE1
Y1
4
27 DY1
Z1
5
26 LB
SEL1
6
25 ON/OFF
SEL2
7
24 DY2
SEL1 8
21 LB
SEL2 9
20 ON/OFF
23 DZ2/DE2
15 V-
Y2
9
22 RA2
B2
10
21 RB2
11
12
13
14
15
16
17
18
19
20
NC
GND 14
V-
8
RXEN2
Z2
RXEN1
16 RB2
GND
A2 13
GND
17 RA2
SPB
B2 12
SPA
18 DZ2/DE2
NC
19 DY2
A2
Z2 10
Y2 11
Pin Descriptions
PIN
MODE
FUNCTION
GND
BOTH
Ground connection.
LB
BOTH
Loopback mode. In the ISL81334, Loopback mode is enabled when LB is low. In the ISL41334, Loopback mode is enabled when
LB and RXEN are low.
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.
RXEN1
RXEN2
BOTH
Active low receiver output enable. Rx is enabled when RXEN is low; Rx is high impedance when RXEN is high. Internally pulled
low. (QFN only)
SELx
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 (5V).
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 the application should use the VL supply for the high voltage level. (QFN only)
Ax
RS-232 Receiver input with ±15kV ESD protection. A low on Ax forces RAx high; a high on Ax forces RAx low.
RS-485 Inverting receiver input with ±15kV ESD protection.
Bx
RS-232 Receiver input with ±15kV ESD protection. A low on Bx forces RB high; a high on Bx forces RBx low.
RS-485 Noninverting receiver input with ±15kV ESD protection.
DYx
RS-232 Driver input. A low on DYx forces output Yx high. Similarly, a high on DYx forces output Yx low.
RS-485 Driver input. A low on DYx forces output Yx high and output Z low. Similarly, a high on DY forces output Yx low and output Zx high.
DZx
RS-232 Driver input. A low on DZx forces output Zx high. Similarly, a high on DZ forces output Zx low.
FN6202 Rev.4.01
Oct 24, 2019
Page 4 of 33
ISL81334, ISL41334
Pin Descriptions
PIN
MODE
FUNCTION
DEx
RS-485 Driver output enable. The driver outputs, Yx and Zx, are enabled by bringing DE high. They are high impedance when DE is low.
Internally pulled high when port selected for RS-485 mode.
RAx
RS-232 Receiver output.
RS-485 Receiver output: If Bx > Ax by at least -40mV, RAx is high; If Bx < Ax by -200mV or more, RAx is low; RAx = High if Ax and Bx are
unconnected (floating) or shorted together (i.e., full fail-safe).
RBx
RS-232 Receiver output.
RS-485 Not used. Internally pulled-high, and unaffected by RXEN.
Yx
RS-232 Driver output with ±15kV ESD protection.
RS-485 Inverting driver output with ±15kV ESD protection.
Zx
RS-232 Driver output with ±15kV ESD protection.
RS-485 Noninverting driver output with ±15kV ESD protection.
SPx
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.
FN6202 Rev.4.01
Oct 24, 2019
Page 5 of 33
ISL81334, ISL41334
TABLE 2. ISL81334 FUNCTION TABLE
INPUTS
RECEIVER OUTPUTS
DRIVER OUTPUTS
SEL1 or 2
ON/OFF
DE1 or 2
RAx
RBx
Yx
Zx
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 (Note 5)
High-Z
High-Z
OFF
RS-485
1
1
1
ON
High-Z (Note 5)
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.
5. Internally pulled high through a 40kΩ resistor.
ISL81334 Truth Tables
(for each port)
RS-485 TRANSMITTING MODE
RS-232 TRANSMITTING MODE
INPUTS
INPUTS
OUTPUTS
SEL1 or 2
ON/OFF
DYx
DZx
Yx
Zx
0
1
0
0
1
1
0
1
0
1
1
0
0
1
1
0
0
1
0
1
1
1
0
0
0
0
X
X
High-Z
High-Z
OUTPUTS
SEL1 or 2
ON/OFF
DE1 or 2
DYx
Yx
Zx
1
1
1
0
1
0
1
1
1
1
0
1
1
1
0
X
High-Z
High-Z
1
0
X
X
High-Z
High-Z
RS-485 RECEIVING MODE
RS-232 RECEIVING MODE
INPUTS
INPUTS
OUTPUT
SEL1 or 2
ON/OFF
Ax
Bx
RAx
RBx
0
1
0
0
1
1
0
1
0
1
1
0
0
1
1
0
0
1
0
1
1
1
0
0
0
1
Open
Open
1
1
0
0
X
X
High-Z
High-Z
FN6202 Rev.4.01
Oct 24, 2019
OUTPUT
SEL1 or 2
ON/OFF
Bx-Ax
RAx
RBx
(Note 6)
1
1
-40mV
1
High-Z
1
1
-200mV
0
High-Z
1
1
Open or Shorted together
1
High-Z
1
0
X
High-Z
High-Z
NOTE:
6. Internally pulled high through a 40kΩ resistor.
Page 6 of 33
ISL81334, ISL41334
TABLE 3. ISL41334 FUNCTION TABLE
RECEIVER
OUTPUTS
INPUTS
DRIVER
OUTPUTS
DRIVER
DATA
RATE
(Mbps)
MODE
RAx
RBx
Yx
Zx
CHARGE
PUMPS
(Note 7)
N.A.
ON
ON
ON
ON
ON
0.46
RS-232
1
N.A.
High-Z
High-Z
ON
ON
ON
0.46
RS-232
X
X
X
High-Z
High-Z
High-Z
High-Z
OFF
N.A.
Shutdown
X
X
0
0
ON
High-Z (Note 8)
High-Z
High-Z
OFF
N.A.
RS-485
1
0
0
0
1
ON
High-Z (Note 8)
ON
ON
OFF
0.46
RS-485
1
1
0
1
0
1
ON
High-Z (Note 8)
ON
ON
OFF
0.115
RS-485
1
1
1
0
0
1
ON
High-Z (Note 8)
ON
ON
OFF
20
RS-485
1
1
1
1
0
1
ON
High-Z (Note 8)
ON
ON
OFF
20
RS-485
1
1
X
X
1
0
High-Z
High-Z (Note 8)
High-Z
High-Z
OFF
N.A.
RS-485
1
1
0
0
1
1
High-Z
High-Z (Note 8)
ON
ON
OFF
0.46
RS-485
1
1
0
1
1
1
High-Z
High-Z (Note 8)
ON
ON
OFF
0.115
RS-485
1
1
1
0
1
1
High-Z
High-Z (Note 8)
ON
ON
OFF
20
RS-485
1
1
1
1
1
1
High-Z
High-Z (Note 8)
ON
ON
OFF
20
RS-485
SEL1 or 2
ON/OFF
SPA
SPB
0
1
X
X
0
0
1
X
X
X
0
X
1
1
1
RXEN1 or 2 DE1 or 2
NOTE:
7. 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.
8. Internally pulled high through a 40kΩ resistor.
ISL41334 Truth Tables
RS-485 TRANSMITTING MODE
(for each port)
INPUTS
RS-232 TRANSMITTING MODE
INPUTS
OUTPUTS
SEL1 or 2
ON/OFF
DYx
DZx
Yx
Zx
0
1
0
0
1
1
0
1
0
1
1
0
0
1
1
0
0
1
0
1
1
1
0
0
0
0
X
X
High-Z
High-Z
SEL1
or 2
ON/ DE1 or
OFF
2
SPA
SPB
DYx
Yx
Zx
DATA
RATE
(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
OUTPUT
INPUTS
OUTPUT
SEL1
or 2
ON/OFF
RXEN1
or 2
Bx-Ax
RAx
RBx
(Note 9)
1
1
0
≥ -40mV
1
High-Z
1
1
0
≤ -200mV
0
High-Z
1
1
0
Open or Shorted
together
1
High-Z
SEL1 or 2
ON/OFF
RXEN1
or 2
0
1
0
0
0
1
1
0
1
0
0
1
1
0
0
1
0
1
0
0
1
0
1
0
1
1
0
0
1
1
1
X
High-Z
High-Z
0
1
0
Open
Open
1
1
1
0
X
X
High-Z
High-Z
0
1
1
X
X
High-Z High-Z
0
0
X
X
X
High-Z High-Z
FN6202 Rev.4.01
Oct 24, 2019
Ax
Bx
RAx
RBx
NOTE:
9. Internally pulled high through a 40kΩ resistor.
Page 7 of 33
ISL81334, ISL41334
Typical Operating Circuits
Red pin numbers = Port 1, Blue pin numbers = Port 2
VCC
VCC
0.1µF
0.1µF
26
26
1
0.1µF
2
0.1µF
3
C1+
C1V+
(11) 6
Yx
(10) 7
Zx
(13) 4
Ax
(12) 5
Bx
(9) 8
VCC
SELx
C2+
ISL81334
5k
5k
GND
C2V-
1
28
0.1µF
27
15
0.1µF
0.1µF
2
0.1µF
3
C1+
C1V+
DYx 22 (19)
DZx 23 (18)
(11) 6
Yx
(10) 7
Zx
RAx 24 (17)
RBx 25 (16)
(13) 4
LB
ON/OFF
21
20
(12) 5
(9) 8
High
VCC
C2+
ISL81334
C2V-
28
0.1µF
27
15
0.1µF
DYx 22 (19)
DZx 23 (18)
RAx 24 (17)
RBx 25 (16)
Ax
Bx
SELx
LB
High
GND
ON/OFF
21
20
Low
High
14
14
NOTE: PINOUT FOR SOIC AND SSOP
SAME FOR PORT 2.
NOTE: PINOUT FOR SOIC AND SSOP
SAME FOR PORT 2.
FIGURE 1. RS-232 MODE WITHOUT LOOPBACK
FIGURE 2. RS-232 MODE WITH LOOPBACK
VCC
VCC
0.1µF
0.1µF
26
26
1
0.1µF
2
0.1µF
VCC
3
C1+
C1V+
(11) 6
Yx
(10) 7
Zx
(13) 4
Ax
(12) 5
Bx
(9) 8
VCC
C2+
ISL81334
D
R
SELx
C2V-
0.1µF
27
15
0.1µF
0.1µF
ON/OFF
20
High
High
14
3
C1V+
Yx
(10) 7
Zx
(12) 5
VCC
C1+
(11) 6
(13) 4
RAx 24 (17)
RBx 25 (16)
21
2
0.1µF
DYx 22 (19)
DEx 23 (18)
LB
GND
1
28
(9) 8
Ax
Bx
VCC
C2+
ISL81334
D
B
SELx
C2V-
0.1µF
27
15
0.1µF
DYx 22 (19)
DEx 23 (18)
RAx 24 (17)
RBx 25 (16)
LB
GND
28
ON/OFF
21
20
Low
High
14
NOTE: PINOUT FOR SOIC AND SSOP
SAME FOR PORT 2.
NOTE: PINOUT FOR SOIC AND SSOP
SAME FOR PORT 2.
FIGURE 3. RS-485 MODE WITHOUT LOOPBACK
FIGURE 4. RS-485 MODE WITH LOOPBACK
FN6202 Rev.4.01
Oct 24, 2019
Page 8 of 33
ISL81334, ISL41334
Typical Operating Circuits (Continued)
Red pin numbers = Port 1, Blue pin numbers = Port 2
VCC
0.1µF
VL
37
C1+
38
0.1µF
1
ISL41334
V+
(9) 4 Yx
(8) 5 Zx
5k
5k
SELx
13
C2V-
36
37
0.1µF
35
19
0.1µF
0.1µF
38
0.1µF
29 (22)
(11) 2
30 (21)
(10) 3
RXENx 17 (18)
(7) 6
ON/OFF
GND
26
25
VCC
C1+
C1-
VL
ISL41334
V+
13
High
14
High
34
37
0.1µF
38
0.1µF
VL
1
C1+
Ax
Bx
SPA
C1V+
(9) 4
Yx
(8) 5
Zx
(11) 2
Ax
(10) 3
Bx
(7) 6
13
14
ISL41334
D
C2+
C2V-
SPB
0.1µF
36
37
0.1µF
35
19
0.1µF
DEx
28 (23)
DYx
27 (24)
RBx
30 (21)
LB
SPA
SPB
0.1µF
0.1µF
ON/OFF
26
25
High
High
GND
15,16
38
0.1µF
17 (18)
26
High
VCC
VL
1
C1+
(11) 2
(10) 3
VL
(7) 6
13
14
VL
VCC
C1V+
AX
BX
ISL41334
D
B
C2+
C2V-
36
0.1µF
35
19
0.1µF
DEx 28 (23)
DYx 27 (24)
RBx 30 (21)
RAx 29 (22)
RXENx 17 (18)
SELX
LB
SPA
SPB
0.1µF
31
ON/OFF
26
25
Low
Low
High
GND
15,16
NOTE: PINOUT FOR SOIC AND SSOP
SAME FOR PORT 2.
NOTE: PINOUT FOR SOIC AND SSOP
SAME FOR PORT 2.
FIGURE 7. RS-485 MODE WITHOUT LOOPBACK
FIGURE 8. RS-485 MODE WITH LOOPBACK
FN6202 Rev.4.01
Oct 24, 2019
Low
Low
25
ON/OFF
GND
(9) 4 YX
(8) 5 ZX
29 (22)
RXENx 17 (18)
SELx
30 (21)
FIGURE 6. RS-232 MODE WITH LOOPBACK
RAx
R
29 (22)
RBx
LB
34
VL
0.1µF
RAx
RXENx
SELx
31
VCC
19
V-
NOTE: PINOUT FOR SOIC AND SSOP
SAME FOR PORT 2.
FIGURE 5. RS-232 MODE WITHOUT LOOPBACK
VL
0.1µF
35
C2-
15,16
NOTE: PINOUT FOR SOIC AND SSOP
SAME FOR PORT 2.
VCC
36
C2+
DYx 27 (24)
DZx 28 (23)
15,16
0.1µF
0.1µF
31
(9) 4 Yx
(8) 5 Zx
RBx
LB
SPB
1
RAx
SPA
14
C2+
DYx 27 (24)
DZx 28 (23)
(11) 2 Ax
(10) 3 Bx
(7) 6
VL
34
VL
VCC
C1-
VCC
0.1µF
31
34
0.1µF
0.1µF
Page 9 of 33
ISL81334, ISL41334
Absolute Maximum Ratings
Thermal Information
(TA = +25°C)
VCC to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
VL (QFN only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VCC + 0.5V
Input Voltages
All Except Ax, Bx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
Input/Output Voltages
Ax, Bx (Any Mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25V to +25V
Yx, Zx (Any Mode, Note 10) . . . . . . . . . . . . . . . . . . . . . . -12.5V to +12.5V
RAx, RBx (Non-QFN Package) . . . . . . . . . . . . . . . . . -0.5V to (VCC + 0.5V)
RAx, RBx (QFN Package) . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VL + 0.5V)
Output Short-Circuit Duration
Yx, Zx, RAx, RBx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
JA (°C/W)
Thermal Resistance
65
28 Ld SOIC Package (Note 12) . . . . . . . . . . . . . . . . . . . .
28 Ld SSOP Package (Note 12) . . . . . . . . . . . . . . . . . . .
60
40 Ld QFN Package (Note 11) . . . . . . . . . . . . . . . . . . . .
32
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:
10. One output at a time, IOUT ≤100mA for ≤ 10 mins.
11. JA is measured in free air with the component mounted on a high-effective thermal conductivity test board with direct attach features. See TB379.
12. JA is measured with the component mounted on a high-effective thermal conductivity test board in free air. See TB379 for details.
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); unless otherwise specified.
Typicals are at VCC = 5V, TA = +25°C (Note 13).
PARAMETER
SYMBOL
TEMP
MIN
(°C) (Note 18)
TEST CONDITIONS
TYP
MAX
(Note 18) UNIT
DC CHARACTERISTICS - RS-485 DRIVER (SELx = 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 = 50Ω (RS-422) (Figure 9)
Full
2.5
3.1
-
V
R = 27Ω (RS-485) (Figure 9)
Full
2.2
2.7
5
V
VOD3
RD = 60Ω, R = 375Ω, VCM = -7V to 12V (Figure 9)
Full
2
2.7
5
V
VOD
R = 27Ω or 50Ω (Figure 9)
Full
-
0.01
0.2
V
VOC
R = 27Ω or 50Ω (Figure 9) (Note 17)
Full
-
-
3.1
V
VOC
R = 27Ω or 50Ω (Figure 9) (Note 17)
Full
-
0.01
0.2
V
Full
35
-
250
mA
VOUT = 12V
Full
-
-
500
µA
VOUT = -7V
Full
-200
-
-
µA
Driver Short-Circuit Current,
VOUT = High or Low
IOS
-7V ≤ (VY or VZ) ≤ 12V (Note 15)
Driver Three-State Output Leakage
Current (Yx, Zx)
IOZ
Outputs Disabled,
VCC = 0V or 5.5V
DC CHARACTERISTICS - RS-232 DRIVER (SELx = GND)
Driver Output Voltage Swing
VO
All TOUTS Loaded with 3kΩ to Ground
Full
±5.0
+6/-7
-
V
Driver Output Short-Circuit Current
IOS
VOUT = 0V
Full
-60
25/-35
60
mA
DC CHARACTERISTICS - LOGIC PINS (SUCH AS DRIVER AND CONTROL INPUT PINS)
Input High Voltage
Input Low Voltage
FN6202 Rev.4.01
Oct 24, 2019
VIH1
VL = VCC if QFN
Full
2
1.6
-
V
VIH2
VL = 3.3V (QFN only)
Full
2
1.2
-
V
VIH3
VL = 2.5V (QFN only)
Full
1.5
1
-
V
VIL1
VL = VCC if QFN
Full
-
1.4
0.8
V
VIL2
VL = 3.3V (QFN only)
Full
-
1
0.7
V
VIL3
VL = 2.5V (QFN only)
Full
-
-
0.5
V
Page 10 of 33
ISL81334, ISL41334
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); unless otherwise specified.
Typicals are at VCC = 5V, TA = +25°C (Note 13). (Continued)
PARAMETER
Input Current
SYMBOL
TEMP
MIN
(°C) (Note 18)
TEST CONDITIONS
TYP
MAX
(Note 18) UNIT
IIN1
Pins Without pull-ups or pull-downs
Full
-2
-
2
µA
IIN2
LB, ON/OFF, DEx, SPx (QFN), RXENx (QFN)
Full
-25
-
25
µA
DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (SELx = VCC)
Receiver Differential Threshold
Voltage
V TH
-7V VCM 12V, full fail-safe
Full
-0.2
-
-0.04
V
Receiver Input Hysteresis
V TH
VCM = 0V
25
-
35
-
mV
VIN = 12V
Full
-
-
0.8
mA
VIN = -7V
Full
-0.64
-
-
mA
Full
15
-
-
kΩ
Receiver Input Current (Ax, Bx)
Receiver Input Resistance
IIN
RIN
VCC = 0V or 4.5 to 5.5V
-7V ≤ VCM ≤ 12V, VCC = 0 (Note 16) or
4.5V ≤ VCC ≤ 5.5V
DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (SELx = GND)
Receiver Input Voltage Range
VIN
Full
-25
-
25
V
Receiver Input Threshold
VIL
Full
-
1.4
0.8
V
VIH
Full
2.4
1.9
-
V
Receiver Input Hysteresis
V TH
25
-
0.5
-
V
Receiver Input Resistance
RIN
Full
3
5
7
kΩ
VIN = ±15V, VCC Powered Up (Note 16)
DC CHARACTERISTICS - RECEIVER OUTPUTS (485 OR 232 MODE)
Receiver Output High Voltage
VOH1
IO = -2mA (VL = VCC if QFN)
Full
3.5
4.6
-
V
VOH2
IO = -650µA, VL = 3V (QFN only)
Full
2.6
2.9
-
V
VOH3
IO = -500µA, VL = 2.5V (QFN only)
Full
2
2.4
-
V
Receiver Output Low Voltage
VOL
IO = 3mA
Full
-
0.1
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 (RBx) Pull-Up
Resistance
ROBZ
ON/OFF = VCC, SELx = VCC (RS-485 mode)
25
-
40
-
kΩ
ICC232
SEL1 or SEL2 = GND, LB = ON/OFF = VCC
Full
-
3.7
7
mA
ICC485
SEL1 and 2 = LB = DE = ON/OFF = VCC
Full
-
1.6
5
mA
ISHDN232
ON/OFF = SELx = GND, LB = VCC, (SPx = VCC if QFN)
Full
-
25
50
µA
ISHDN485
ON/OFF = DEX = GND,
SELx = LB = VCC,
(SPx = GND if QFN)
SOIC/SSOP
Full
-
42
80
µA
QFN
Full
-
80
160
µA
POWER SUPPLY CHARACTERISTICS
No-Load Supply Current (Note 14)
Shutdown Supply Current
ESD CHARACTERISTICS
Bus Pins (Ax, Bx, Yx, Zx) Any Mode
Human body model
25
-
15
-
kV
All Other Pins
Human body model
25
-
4
-
kV
RS-232 DRIVER AND RECEIVER SWITCHING CHARACTERISTICS (SELx = GND, ALL VERSIONS AND SPEEDS)
Driver Output Transition Region
Slew Rate
SR
Driver Output Transition Time
tr, tf
FN6202 Rev.4.01
Oct 24, 2019
RL = 3kΩ, Measured From
3V to -3V or -3V to 3V
RL = 3kΩ, CL = 2500pF, 10% to 90%
CL ≥ 15pF
Full
-
18
30
V/µs
CL 2500pF
Full
4
12
-
V/µs
Full
0.22
1.2
3.1
µs
Page 11 of 33
ISL81334, ISL41334
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); unless otherwise specified.
Typicals are at VCC = 5V, TA = +25°C (Note 13). (Continued)
PARAMETER
Driver Propagation Delay
SYMBOL
tDPHL
TEST CONDITIONS
RL = 3kΩ, CL = 1000pF (Figure 14)
tDPLH
TEMP
MIN
(°C) (Note 18)
TYP
MAX
(Note 18) UNIT
Full
-
1
2
µs
Full
-
1.2
2
µs
Driver Propagation Delay Skew
tDSKEW
tDPHL - tDPLH (Figure 14)
Full
-
240
400
ns
Driver Enable Time from Shutdown
tDENSD
VOUT = ±3.0V
25
-
20
-
µs
Driver Maximum Data Rate
DRD
RL = 3kΩ, CL = 1000pF, One Transmitter Switching
per port
Full
460
650
-
kbps
Receiver Propagation Delay
tRPHL
CL = 15pF (Figure 15)
Full
-
50
120
ns
Full
-
40
120
ns
tRPHL - tRPLH (Figure 15)
Full
-
10
40
ns
CL = 15pF
Full
0.46
2
-
Mbps
tRPLH
Receiver Propagation Delay Skew
Receiver Maximum Data Rate
tRSKEW
DRR
RS-485 DRIVER SWITCHING CHARACTERISTICS (FAST DATA RATE (20Mbps), SELx = VCC, ALL VERSIONS (SPA = VCC if QFN))
Driver Differential Input to Output
Delay
tDLH, tDHL RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
15
30
50
ns
Driver Output Skew
tSKEW
RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
-
3
10
ns
Driver Differential Rise or Fall Time
tR, tF
RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
3
11
20
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 11)
Full
-
27
60
ns
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 11)
Full
-
24
60
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 11)
Full
-
31
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 11)
Full
-
24
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 500Ω, CL = 100pF, SW = VCC (Figure 11)
Full
-
65
250
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN) RL = 500Ω, CL = 100pF, SW = GND (Figure 11)
Full
-
152
250
ns
Full
-
30
-
Mbps
Driver Maximum Data Rate
fMAX
RDIFF = 54Ω, CL = 100pF (Figure 10)
RS-485 DRIVER SWITCHING CHARACTERISTICS (MEDIUM DATA RATE (460kbps, QFN ONLY), SELx = VCC, SPA = SPB = GND)
Driver Differential Input to Output
Delay
tDLH, tDHL RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
200
490
1000
ns
Driver Output Skew
tSKEW
RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
-
110
400
ns
Driver Differential Rise or Fall Time
tR, tF
RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
300
600
1100
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 11)
Full
-
30
300
ns
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 11)
Full
-
128
300
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 11)
Full
-
31
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 11)
Full
-
24
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 500Ω, CL = 100pF, SW = VCC (Figure 11)
Full
-
65
500
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN) RL = 500Ω, CL = 100pF, SW = GND (Figure 11)
Full
-
255
500
ns
Full
-
2000
-
kbps
2500
ns
Driver Maximum Data Rate
fMAX
RDIFF = 54Ω, CL = 100pF (Figure 10)
RS-485 DRIVER SWITCHING CHARACTERISTICS (SLOW DATA RATE (115kbps, QFN ONLY), SELx = VCC, SPA = GND, SPB = VCC)
Driver Differential Input to Output
Delay
FN6202 Rev.4.01
Oct 24, 2019
tDLH, tDHL RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
800
1500
Page 12 of 33
ISL81334, ISL41334
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); unless otherwise specified.
Typicals are at VCC = 5V, TA = +25°C (Note 13). (Continued)
PARAMETER
SYMBOL
TEMP
MIN
(°C) (Note 18)
TEST CONDITIONS
TYP
MAX
(Note 18) UNIT
Driver Output Skew
tSKEW
RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
-
350
1250
ns
Driver Differential Rise or Fall Time
tR, tF
RDIFF = 54Ω, CL = 100pF (Figure 10)
Full
1000
2000
3100
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 11)
Full
-
32
600
ns
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 11)
Full
-
300
600
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 11)
Full
-
31
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 11)
Full
-
24
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 500Ω, CL = 100pF, SW = VCC (Figure 11)
Full
-
65
800
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN) RL = 500Ω CL = 100pF, SW = GND (Figure 11)
Full
-
420
800
ns
Full
-
800
-
kbps
Full
20
50
90
ns
Full
-
0.1
10
ns
Full
-
40
-
Mbps
Driver Maximum Data Rate
fMAX
RDIFF = 54Ω, CL = 100pF (Figure 10)
RS-485 RECEIVER SWITCHING CHARACTERISTICS (SELx = VCC, ALL VERSIONS AND SPEEDS)
Receiver Input to Output Delay
tPLH, tPHL (Figure 12)
Receiver Skew | tPLH - tPHL |
tSKEW
Receiver Maximum Data Rate
fMAX
(Figure 12)
RECEIVER ENABLE/DISABLE CHARACTERISTICS (ALL MODES AND SPEEDS)
Receiver Enable to Output Low
tZL
QFN Only, CL = 15pF, SW = VCC (Figure 13)
Full
-
22
60
ns
Receiver Enable to Output High
tZH
QFN Only, CL = 15pF, SW = GND (Figure 13)
Full
-
23
60
ns
Receiver Disable from Output Low
tLZ
QFN Only, CL = 15pF, SW = VCC (Figure 13)
Full
-
24
60
ns
Receiver Disable from Output High
tHZ
QFN Only, CL = 15pF, SW = GND (Figure 13)
Full
-
25
60
ns
Receiver Enable from Shutdown to
Output Low
tZLSHDN
CL = 15pF, SW = VCC (Figure 13)
RS-485 mode
Full
-
260
700
ns
RS-232 mode
25
-
35
-
ns
Receiver Enable from Shutdown to
Output High
tZHSHDN
RS-485 mode
Full
-
260
700
ns
RS-232 mode
25
-
25
-
ns
CL = 15pF, SW = GND (Figure 13)
NOTES:
13. 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.
14. Supply current specification is valid for loaded drivers when DE = 0V (RS-485 mode only).
15. Applies to peak current. See “Typical Performance Curves” starting on 22 for more information.
16. RIN defaults to RS-485 mode (>15kΩ) when the device is unpowered (VCC = 0V), or in SHDN, regardless of the state of the SELx inputs.
17. VCC ≤ 5.25V.
18. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
FN6202 Rev.4.01
Oct 24, 2019
Page 13 of 33
ISL81334, ISL41334
Test Circuits and Waveforms
R
VCC
DE
DY
Y
RD
D
VOD
Z
VOC
R
FIGURE 9. RS-485 DRIVER VOD AND VOC TEST CIRCUIT
3V
DY
1.5V
1.5V
0V
tPHL
tPLH
VOH
50%
OUT (Z)
50%
VOL
tPLH
tPHL
VCC
CL = 100pF
DE
DY
VOH
OUT (Y)
50%
VOL
Y
tDLH
RDIFF
D
50%
Z
CL = 100pF
90%
DIFF OUT (Z - Y)
10%
SIGNAL
GENERATOR
tDHL
0V
0V
+VOD
90%
10%
tR
-VOD
tF
SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|
FIGURE 10A. TEST CIRCUIT
FIGURE 10B. MEASUREMENT POINTS
FIGURE 10. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FN6202 Rev.4.01
Oct 24, 2019
Page 14 of 33
ISL81334, ISL41334
Test Circuits and Waveforms (Continued)
DE
Y
DY
500Ω
VCC
D
SIGNAL
GENERATOR
SW
Z
GND
CL
ENABLED
DE
(ON/OFF FOR SHDN)
3V
1.5V
1.5V
0V
tZH
tZH(SHDN)
FOR SHDN TESTS, SWITCH ON/OFF RATHER THAN DE
PARAMETER
ON/DE
OUTPUT
DY
SW
CL (pF)
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
OUTPUT HIGH
OUT (Y, Z)
tHZ
VOH - 0.5V VOH
2.3V
0V
tZL
tZL(SHDN)
tLZ
VCC
OUT (Y, Z)
2.3V
OUTPUT LOW
FIGURE 11A. TEST CIRCUIT
VOL + 0.5V V
OL
FIGURE 11B. MEASUREMENT POINTS
FIGURE 11. RS-485 DRIVER ENABLE AND DISABLE TIMES
+1.5V
RXEN (QFN ONLY)
15pF
A
0V
B
RA
R
B
0V
0V
-1.5V
tPLH
tPHL
VCC
RA
SIGNAL
GENERATOR
1.5V
1.5V
0V
FIGURE 12B. MEASUREMENT POINTS
FIGURE 12A. TEST CIRCUIT
FIGURE 12. RS-485 RECEIVER PROPAGATION DELAY
RXEN (QFN ONLY)
A
R
SIGNAL
GENERATOR
1kΩ
RA
VCC
SW
B
ON/OFF
(FOR SHDN TESTS)
3V
1.5V
GND
0V
ENABLED
3V
15pF
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 13A. TEST CIRCUIT
tZH
tZH(SHDN)
RA
OUTPUT HIGH
tHZ
VOH - 0.5V VOH
1.5V
0V
tZL
tZL(SHDN)
RA
tLZ
VCC
1.5V
OUTPUT LOW
VOL + 0.5V V
OL
FIGURE 13B. MEASUREMENT POINTS
FIGURE 13. RS-485 RECEIVER ENABLE AND DISABLE TIMES
FN6202 Rev.4.01
Oct 24, 2019
Page 15 of 33
ISL81334, ISL41334
Test Circuits and Waveforms (Continued)
3V
DY,Z
DY,Z
D
1.5V
1.5V
CL
Y, Z
0V
tDPHL
RL
SIGNAL
GENERATOR
tDPLH
VO+
OUT (Y,Z)
0V
0V
VO-
SKEW = |tDPHL - tDPLH|
FIGURE 14A. TEST CIRCUIT
FIGURE 14B. MEASUREMENT POINTS
FIGURE 14. RS-232 DRIVER PROPAGATION DELAY AND TRANSITION TIMES
3V
RXEN (QFN ONLY)
A, B
R
RA, RB
A, B
1.3V
1.7V
0V
CL = 15pF
tRPLH
tRPHL
2.4V
RA, RB
SIGNAL
GENERATOR
0.8V
VOL
SKEW = |tRPHL - tRPLH|
FIGURE 15A. TEST CIRCUIT
VOH
FIGURE 15B. MEASUREMENT POINTS
FIGURE 15. RS-232 RECEIVER PROPAGATION DELAY AND TRANSITION TIMES
Typical Application
+5V
+ 0.1µF
1
RS-232 to RS-485 Converter
C1
0.1µF
The ISL81334 and ISL41334 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 16 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.
C2
0.1µF
2
C128
C2+
+
27
C2-
NC
4 A1
Detailed Description
Each of the two ISL81334 and ISL41334 ports support 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 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, RS-422 maximum distance of 4000’ (1220m). It is
important to note that the ISL81334 and ISL41334 do not follow
the RS-485 convention whereby the inverting I/O is labeled “B/Z”,
and the noninverting I/O is “A/Y”. Thus, in the application diagrams
below the 1334 A/Y (B/Z) pins connect to the B/Z (A/Y) pins of the
generic RS-485, RS-422 ICs.
FN6202 Rev.4.01
Oct 24, 2019
+
C1+
26
VCC
V+
3
V- 15
R
RA1 24
+C3
0.1µF
C4
0.1µF
+
NC
5kΩ
TxD
RS-232 IN
5 B1
R
RB1 25
5kΩ
6 Y1
NC
RxD
RS-232 OUT
D
7 Z1
8
VCC
9
D
ON/OFF
SEL2
12 B2
R
11 Y2
RS-485 OUT
10
DZ1 23
SEL1
13 A2
RS-485 IN
DY1 22
Z2
D
20
VCC
RA2 17
DY2 19
DE2 18
VCC
GND
14
NOTE: PINOUT FOR SOIC AND SSOP
FIGURE 16. SINGLE IC RS-232 TO RS-485 CONVERTER
Page 16 of 33
ISL81334, ISL41334
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 18.
Protocol selection is handled through a logic pin (SELx) for
each port.
ISL81334 and ISL41334 Advantages
These dual protocol ICs offer many parametric improvements
compared to those offered on competing dual protocol
devices. Some of the major improvements are:
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 17. Each port set to RS-485 /422 mode
includes one Rx and one Tx.
• 15kV bus pin ESD - Eases board level requirements
• 2.7V Diff VOUT - Better noise immunity and/or distance
• Full fail-safe RS-485 Rx - Eliminates bus biasing
• Selectable RS-485 Data Rate - Up to 20Mbps, or slew rate
limited for low EMI and fewer termination issues
• High RS-232 data rate - >460kbps
RS-232 is a point-to-point, singled ended (signal voltages
referenced to GND) communication protocol targeting fairly
short (
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