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ISO1211, ISO1212
SLLSEY7F – JUNE 2017 – REVISED APRIL 2020
ISO121x Isolated 24-V to 60-V Digital Input Receivers for Digital Input Modules
1 Features
3 Description
•
The ISO1211 and ISO1212 devices are isolated 24-V
to 60-V digital input receivers, compliant to IEC
61131-2 Type 1, 2, and 3 characteristics. These
devices enable 9-V to 300-V DC and AC digital input
modules in programmable logic controllers (PLCs),
motor-control, grid infrastructure, and other industrial
applications. Unlike traditional optocoupler solutions
with discrete, imprecise current limiting circuitry, the
ISO121x devices provide a simple, low-power
solution with an accurate current limit to enable the
design of compact and high-density I/O modules.
These devices do not require field-side power supply
and are configurable as sourcing or sinking inputs.
1
•
•
•
•
•
•
•
•
•
•
•
•
•
Compliant to IEC 61131-2; Type 1, 2, 3
characteristics for 24-V isolated digital inputs
Supports 9-V to 300-V DC and AC digital input
designs using external resistors
Accurate Current Limit for Low-Power Dissipation:
– 2.2 mA to 2.47 mA for Type 3
– Adjustable up to 6.5 mA
Eliminates the need for field-side power supply
High input-voltage range with reverse polarity
protection: ±60 V
Wire-break detection (refer to TIDA-01509)
Configurable as sourcing or sinking input
High data rates: up to 4 Mbps
Enable pin to multiplex output signals
High transient immunity: ±70-kV/µs CMTI
Wide supply range (VCC1): 2.25 V to 5.5 V
Ambient temperature range: –40°C to +125°C
Compact package options:
– Single-channel ISO1211, SOIC-8
– Dual-channel ISO1212, SSOP-16
Safety-Related Certifications:
– Basic insulation per DIN VDE V 0884-11
– UL 1577 recognition, 2500-VRMS insulation
– IEC 60950-1, IEC 62368-1, IEC 61010-1 and
GB 4943.1-2011 certifications
2 Applications
•
•
•
•
•
Programmable Logic Controller (PLC)
– Digital Input Modules
– Mixed I/O Modules
Motor Drive I/O and Position Feedback
CNC Control
Data Acquisition
Binary Input Modules
The ISO121x devices reduce component count,
simplify system design, improve performance, and
reduce board temperatures compared to traditional
solutions. For details, refer to the How To Simplify
Isolated 24-V PLC Digital Input Module Designs TI
TechNote, How To Improve Speed and Reliability of
Isolated Digital Inputs in Motor Drives TI TechNote,
and How to Design Isolated Comparators for ±48V,
110V and 240V DC and AC Detection TI TechNote.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ISO1211
SOIC (8)
4.90 mm × 3.91 mm
ISO1212
SSOP (16)
4.90 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
ISO121x Devices Reduce Board Temperatures vs
Traditional Solutions
Application Diagram
Field
The ISO121x devices operate over the supply range
of 2.25 V to 5.5 V, supporting 2.5-V, 3.3-V, and 5-V
controllers. A ±60-V input tolerance with reverse
polarity protection helps ensure the input pins are
protected in case of faults with negligible reverse
current. These devices support up to 4-Mbps data
rates passing a minimum pulse width of 150 ns for
high-speed operation. The ISO1211 device is ideal
for designs that require channel-to-channel isolation
and the ISO1212 device is ideal for multichannel
space-constrained designs.
TA = 25°C
PLC Digital Input Module
TA = 25°C
ISO1211
RTHR
24 V
Sensor/
Switch
RSENSE
SENSE
VCC1
IN
OUT
FGND
Host
Controller
GND1
Copyright © 2017, Texas Instruments Incorporated
a) 8-Ch With ISO1212
b) 8-Ch Traditional Solution Without Current Limit
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ISO1211, ISO1212
SLLSEY7F – JUNE 2017 – REVISED APRIL 2020
www.ti.com
Table of Contents
1
2
3
4
5
6
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
1
1
1
2
4
6
Absolute Maximum Ratings ...................................... 6
ESD Ratings ............................................................ 6
Recommended Operating Conditions....................... 6
Thermal Information .................................................. 7
Power Ratings........................................................... 7
Insulation Specifications............................................ 8
Safety-Related Certifications..................................... 9
Safety Limiting Values ............................................ 10
Electrical Characteristics—DC Specification........... 11
Switching Characteristics—AC Specification ........ 12
Insulation Characteristics Curves ......................... 13
Typical Characteristics .......................................... 14
7
Parameter Measurement Information ................ 15
8
Detailed Description ............................................ 18
7.1 Test Circuits ............................................................ 15
8.1
8.2
8.3
8.4
9
Overview .................................................................
Functional Block Diagram .......................................
Feature Description.................................................
Device Functional Modes........................................
18
18
18
19
Application and Implementation ........................ 20
9.1 Application Information............................................ 20
9.2 Typical Application .................................................. 20
10 Power Supply Recommendations ..................... 31
11 Layout................................................................... 32
11.1 Layout Guidelines ................................................. 32
11.2 Layout Example .................................................... 32
12 Device and Documentation Support ................. 34
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
Device Support......................................................
Documentation Support ........................................
Related Links ........................................................
Receiving Notification of Documentation Updates
Community Resource............................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
34
34
34
34
34
34
35
35
13 Mechanical, Packaging, and Orderable
Information ........................................................... 35
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (August 2018) to Revision F
Page
•
Changed VDE standard name From: DIN V VDE V 0884-10 To: DIN VDE V 0884-11 throughout the document ............... 1
•
Changed Features bullet From: "CSA, CQC, TUV Certificates Available" To: "IEC 60950-1, IEC 62368-1, IEC
61010-1 and GB 4943.1-2011 certifications" ......................................................................................................................... 1
•
Updated Applications list ........................................................................................................................................................ 1
•
Changed ISO1211 'SUB' pin description text From: "Leave this pin unconnected on the board" To: "For good
thermal performance, it is recommended to connect this pin to a small 2 mm x 2 mm floating plane on the board. Do
not connect this floating plane to FGND or any other signal or plane." in Pin Functions table .......................................... 4
•
Changed ISO1212 'SUB1' and 'SUB2' pins description text From: "Leave this pin unconnected on the board" To:
"For good thermal performance, it is recommended to connect this pin to a small 2 mm x 2 mm floating plane on the
board. Do not connect this floating plane to FGND1, FGND2, SUBx or any other signal or plane." in Pin Functions
table ....................................................................................................................................................................................... 5
•
Updated certification information in Safety-Related Certifications table................................................................................. 9
Changes from Revision D (March 2018) to Revision E
•
Page
Changed VIH and VIH to VIL and VIH in the RTHR resistor description in the Setting Current Limit and Voltage
Thresholds section................................................................................................................................................................ 22
Changes from Revision C (February 2018) to Revision D
Page
•
Updated the Features and Applications sections. Added a new TI TechNote reference to the Description and
Related Documentation section.............................................................................................................................................. 1
•
Changed the unit for CPG from µm to mm in the Insulation Specifications table .................................................................. 8
•
Changed the Functional Block Diagram ............................................................................................................................... 18
2
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•
Changed VIL from min to typ in the VIL equation .................................................................................................................. 23
•
Added the Designing for Input Voltages Greater Than 60 V section ................................................................................... 25
•
Added the bidirectional implementation example to the Sourcing and Sinking Inputs section ............................................ 31
Changes from Revision B (September 2017) to Revision C
Page
•
Added wire-break detection to the Features section .............................................................................................................. 1
•
Added the enable pin to mutiplex output signals to the Features section.............................................................................. 1
•
Changed RTHR = 5 kΩ to 4 kΩ in the High-Level Voltage Transition Threshold vs Ambient Temperature graph................ 14
•
Changed the Type 1 RTH value from 3 kΩ to 2.5 kΩ in the Surge, IEC ESD and EFT table............................................... 26
Changes from Revision A (September 2017) to Revision B
•
Page
Changed the status from Advance Information to Production Data ....................................................................................... 1
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5 Pin Configuration and Functions
ISO1211 D Package
8-Pin SOIC
Top View
8 SENSE
EN
2
7
IN
OUT
3
6
FGND
GND1
4
5
SUB
ILIM
1
Basic Isolation
VCC1
Pin Functions
PIN
NO.
NAME
I/O
DESCRIPTION
1
VCC1
—
Power supply, side 1
2
EN
I
Output enable. The output pin on side 1 is enabled when the EN pin is high or open. The output pin on
side 1 is in the high-impedance state when the EN pin is low. In noisy applications, tie the EN pin to
VCC1.
3
OUT
O
Channel output
4
GND1
—
Ground connection for VCC1
5
SUB
—
Internal connection to input chip substrate. For good thermal performance, it is recommended to
connect this pin to a small 2 mm x 2 mm floating plane on the board. Do not connect this floating plane
to FGND or any other signal or plane.
6
FGND
—
Field-side ground
7
IN
I
Field-side current input
8
SENSE
I
Field-side voltage sense
4
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ISO1212 DBQ Package
16-Pin SSOP
Top View
1
16 SENSE1
VCC1
2
15
IN1
EN
3
14
FGND1
OUT1
4
13
SUB1
Basic Isolation
ILIM
GND1
Functional Isolation
12
SUB2
5
NC
6
11 SENSE2
NC
7
10
IN2
GND1
8
9
FGND2
ILIM
OUT2
Pin Functions
PIN
I/O
Description
NO.
NAME
1
GND1
—
Ground connection for VCC1
2
VCC1
—
Power supply, side 1
3
EN
I
Output enable. The output pins on side 1 are enabled when the EN pin is high or open. The output
pins on side 1 are in the high-impedance state when the EN pin is low. In noisy applications, tie the EN
pin to VCC1.
4
OUT1
O
Channel 1 output
5
OUT2
O
Channel 2 output
NC
—
Not connected
8
GND1
—
Ground connection for VCC1
9
FGND2
—
Field-side ground, channel 2
10
IN2
I
Field-side current input, channel 2
11
SENSE2
I
Field-side voltage sense, channel 2
12
SUB2
—
Internal connection to input chip 2 substrate. For good thermal performance, it is recommended to
connect this pin to a small 2 mm x 2 mm floating plane on the board. Do not connect this floating plane
to FGND1, FGND2, SUB1 or any other signal or plane.
13
SUB1
—
Internal connection to input chip 1 substrate. For good thermal performance, it is recommended to
connect this pin to a small 2 mm x 2 mm floating plane on the board. Do not connect this floating plane
to FGND1, FGND2, SUB2 or any other signal or plane.
14
FGND1
—
Field-side ground, channel 1
15
IN1
I
Field-side current input, channel 1
16
SENSE1
I
Field-side voltage sense, channel 1
6
7
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
MIN
MAX
UNIT
VCC1
Supply voltage, control side
–0.5
6
V
VOUTx,
VEN
Voltage on OUTx pins and EN pin
–0.5
VCC1 + 0.5 (2)
V
IO
Output current on OUTx pins
–15
15
mA
VINx, VSENSEx Voltage on IN and SENSE pins
–60
60
V
V(ISO,FUNC)
Functional isolation between channels in ISO1212 on the field side
–60
60
V
TJ
Junction temperature
–40
150
°C
Tstg
Storage temperature
–65
150
°C
(1)
(2)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Maximum voltage must not exceed 6 V.
6.2 ESD Ratings
VALUE
Electrostatic
discharge
V(ESD)
(1)
(2)
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001
(1)
UNIT
±2000
Charged device model (CDM), per JEDEC specification JESD22-C101 (2)
V
±1000
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
VCC1
Supply voltage input side
VINx,
VSENSEx
Voltage on INx and SENSEx pins
IOH
High-level output current from OUTx pin
IOL
(1)
Low-level output current into OUTx pin
MIN
MAX
2.25
5.5
V
–60
60
V
VCC1 = 5 V
–4
VCC1 = 3.3 V
–3
VCC1 = 2.5 V
–2
4
VCC1 = 3.3 V
3
VCC1 = 2.5 V
2
Minimum pulse width at SENSEx pins
150
TA
Ambient temperature
–40
(1)
6
mA
VCC1 = 5 V
tUI
UNIT
mA
ns
125
°C
See the Thermal Considerations section.
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6.4 Thermal Information
THERMAL METRIC (1)
ISO1211
ISO1212
D (SOIC)
DBQ (SSOP)
8 PINS
16 PINS
UNIT
RθJA
Junction-to-ambient thermal resistance
146.1
116.9
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
63.1
56.5
°C/W
RθJB
Junction-to-board thermal resistance
80
64.7
°C/W
ΨJT
Junction-to-top characterization parameter
9.6
27.9
°C/W
ΨJB
Junction-to-board characterization parameter
79
64.1
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
—
—
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.5 Power Ratings
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
450
mW
20
mW
VSENSE = 60 V, VCC1 = 5.5 V, RSENSE = 200 Ω,
RTHR = 0 Ω, TJ = 150°C
430
mW
VSENSEx = 60 V, VCC1 = 5.5 V, RSENSE = 200 Ω,
RTHR = 0 Ω, TJ = 150°C
900
mW
40
mW
860
mW
ISO1211
VSENSE = 60 V, VCC1 = 5.5 V, RSENSE = 200 Ω,
RTHR = 0 Ω, TJ = 150°C
PD
Maximum power dissipation, both sides
PD1
Maximum power dissipation, output side VCC1 = 5.5 V, CL = 15 pF, Input 2-MHz 50% duty(side 1)
cycle square wave at SENSE pin, TJ = 150°C
PD2
Maximum power dissipation, field input
side
ISO1212
PD
Maximum power dissipation, both sides
PD1
Maximum power dissipation, output side VCC1 = 5.5 V, CL = 15 pF, Input 2-MHz 50% duty(side 1)
cycle square wave at SENSEx pins, TJ = 150°C
PD2
Maximum power dissipation, field input
side
VSENSEx = 60 V, VCC1 = 5.5 V, RSENSE = 200 Ω,
RTHR = 0 Ω, TJ = 150°C
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6.6 Insulation Specifications
PARAMETER
SPECIFICATION
TEST CONDITIONS
D-8
DBQ-16
UNIT
External clearance (1)
Shortest terminal-to-terminal distance through air
4
3.7
mm
CPG
External Creepage (1)
Shortest terminal-to-terminal distance across the
package surface
4
3.7
mm
DTI
Distance through the insulation
Minimum internal gap (internal clearance)
10.5
10.5
µm
CTI
Comparative tracking index
DIN EN 60112 (VDE 0303-11); IEC 60112
> 600
> 600
V
Material Group
According to IEC 60664-1
CLR
Overvoltage category
DIN VDE V 0884-11:2017-01
I
I
Rated mains voltage ≤ 150 VRMS
I-IV
I-IV
Rated mains voltage ≤ 300 VRMS
I-III
I-III
AC voltage (bipolar)
566
566
VPK
AC voltage (sine wave); time-dependent dielectric
breakdown (TDDB) test
400
400
VRMS
DC voltage
566
566
VDC
3600
3600
VPK
4000
4000
VPK
Method a: After I/O safety test subgroup 2/3,
Vini = VIOTM, tini = 60 s;
Vpd(m) = 1.2 × VIORM = 680 VPK, tm = 10 s
109
Pollution degree
2
2
Climatic category
40/125/21
40/125/21
2500
2500
Ω
UL 1577
VISO
(1)
(2)
(3)
(4)
(5)
8
Withstand isolation voltage
VTEST = VISO = 2500 VRMS, t = 60 s (qualification);
VTEST = 1.2 × VISO = 3000 VRMS, t = 1 s (100%
production)
VRMS
Creepage and clearance requirements should be applied according to the specific equipment isolation standards of an application. Care
should be taken to maintain the creepage and clearance distance of a board design to ensure that the mounting pads of the isolator on
the printed-circuit board do not reduce this distance. Creepage and clearance on a printed-circuit board become equal in certain cases.
Techniques such as inserting grooves and/or ribs on a printed circuit board are used to help increase these specifications.
This coupler is suitable for basic electrical insulation only within the maximum operating ratings. Compliance with the safety ratings shall
be ensured by means of suitable protective circuits.
Testing is carried out in air or oil to determine the intrinsic surge immunity of the isolation barrier.
Apparent charge is electrical discharge caused by a partial discharge (pd).
All pins on each side of the barrier tied together creating a two-terminal device
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6.7 Safety-Related Certifications
VDE
CSA
UL
Certified according to
DIN VDE V 088411:2017-01 and DIN
EN 61010-1 (VDE
0411-1):2011-07
Certified according to IEC
60950-1 and IEC 62368-1
Basic Insulation,
Maximum Transient
Isolation Voltage, 3600
VPK,
Maximum Repetitive
Peak Isolation Voltage,
566 VPK,
Maximum Surge
Isolation Voltage, 4000
VPK
Certificate number:
40047657
CQC
TUV
Certified according to
GB4943.1-2011
Certified according to EN
61010-1:2010/A1:2019, EN
60950-1:2006/A2:2013 and
EN 62368-1:2014
370 VRMS (ISO1212) and
400 VRMS (ISO1211)
Basic Insulation working
voltage per CSA 60950-107+A1 + A2 and IEC
Single protection, 2500
60950-1 2nd Ed. + A1 +
VRMS
A2
300 VRMS Basic Insulation
working voltage per CSA
62368-1-14 and IEC
62368-1 2nd Ed.
Basic Insulation, Altitude ≤
5000m, Tropical Climate,
400 VRMS maximum working
voltage
Basic insulation per EN
61010-1:2010/A1:2019 up
to working voltage of 300
VRMS,
Basic insulation per EN
60950-1:2006/A2:2013 and
EN 62368-1:2014 up to
working voltage of 370
VRMS (ISO1212) and 400
VRMS (ISO1211)
Master contract number:
220991
Certificate number:
CQC15001121656(ISO1211) Client ID number: 77311
CQC18001199097(ISO1212)
Recognized under UL
1577 Component
Recognition Program
File number: E181974
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6.8 Safety Limiting Values
Safety limiting (1) intends to minimize potential damage to the isolation barrier upon failure of input or output circuitry. A failure
of the I/O can allow low resistance to ground or the supply and, without current limiting, dissipate sufficient power to overheat
the die and damage the isolation barrier, potentially leading to secondary system failures.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ISO1211
Safety input, output, or supply
current - side 1
IS
IS
Safety input current - field side
PS
Safety input, output, or total
power
TS
Maximum safety temperature
RθJA = 146.1°C/W, VI = 2.75 V, TJ = 150°C,
TA = 25°C, see Figure 1
310
RθJA = 146.1°C/W, VI = 3.6 V, TJ = 150°C,
TA = 25°C, see Figure 1
237
RθJA = 146.1°C/W, VI = 5.5 V, TJ = 150°C,
TA = 25°C, see Figure 1
155
RθJA = 146.1°C/W, VI = 24 V, TJ = 150°C,
TA = 25°C, see Figure 1
35
RθJA = 146.1°C/W, VI = 36 V, TJ = 150°C,
TA = 25°C, see Figure 1
23
RθJA = 146.1°C/W, VI = 60 V, TJ = 150°C,
TA = 25°C, see Figure 1
14
RθJA = 146.1°C/W, TJ = 150°C, TA = 25°C,
see Figure 2
855
mW
150
°C
mA
mA
ISO1212
IS
IS
Safety input, output, or supply
current - side 1
Safety input current - field side
PS
Safety input, output, or total
power
TS
Maximum safety temperature
(1)
10
RθJA = 116.9°C/W, VI = 2.75 V, TJ = 150°C,
TA = 25°C, see Figure 3
389
RθJA= 116.9°C/W, VI = 3.6 V, TJ = 150°C,
TA = 25°C, see Figure 3
297
RθJA = 116.9°C/W, VI = 5.5 V, TJ = 150°C,
TA = 25°C, see Figure 3
194
RθJA = 116.9°C/W, VI = 24 V, TJ = 150°C,
TA = 25°C, see Figure 3
44
RθJA= 116.9°C/W, VI = 36 V, TJ = 150°C,
TA = 25°C, see Figure 3
29
RθJA = 116.9°C/W, VI = 60 V, TJ = 150°C,
TA = 25°C, see Figure 3
17
RθJA = 116.9°C/W, TJ = 150°C, TA = 25°C,
see Figure 4
mA
mA
1070
mW
150
°C
The safety-limiting constraint is the maximum junction temperature specified in the data sheet. The power dissipation and junction-to-air
thermal impedance of the device installed in the application hardware determines the junction temperature. The assumed junction-to-air
thermal resistance in the Thermal Information table is that of a device installed on a high-K test board for leaded surface-mount
packages. The power is the recommended maximum input voltage times the current. The junction temperature is then the ambient
temperature plus the power times the junction-to-air thermal resistance.
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6.9 Electrical Characteristics—DC Specification
(Over recommended operating conditions unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
VCC1 VOLTAGE SUPPLY
VIT+ (UVLO1)
Positive-going UVLO threshold voltage
(VCC1)
VIT– (UVLO1)
Negative-going UVLO threshold (VCC1)
2.25
1.7
VHYS (UVLO1) UVLO threshold hysteresis (VCC1)
VCC1 supply
quiescent current
ICC1
V
0.2
ISO1211
EN = VCC1
ISO1212
V
V
0.6
1
1.2
1.9
mA
LOGIC I/O
VIT+ (EN)
Positive-going input logic threshold
voltage for EN pin
0.7 ×
VCC1
VIT– (EN)
Negative-going input logic threshold
voltage for EN pin
VHYS(EN)
Input hysteresis voltage for EN pin
IIH
Low-level input leakage at EN pin
EN = GND1
VOH
High-level output voltage on OUTx
VCC1 = 4.5 V; IOH = –4 mA
VCC1 = 3 V; IOH = –3 mA
VCC1= 2.25 V; IOH = –2 mA, see Figure 10
VOL
Low-level output voltage on OUTx
VCC1 = 4.5 V; IOH = 4 mA
VCC1 = 3 V; IOH = 3 mA
VCC1= 2.25 V ; IOH = 2 mA, see Figure 10
0.3 ×
VCC1
V
V
0.1 ×
VCC1
V
–10
μA
VCC1
– 0.4
V
0.4
V
2.47
mA
CURRENT LIMIT
I(INx+SENSEx), Typical sum of current drawn from IN
and SENSE pins across temperature
TYP
RTHR = 0 Ω, RSENSE = 562 Ω, VSENSE = 24 V,
–40°C < TA < 125°C, see Figure 11
2.2
RTHR = 0 Ω, RSENSE = 562 Ω ± 1%;
–60 V < VSENSE < 0 V, see Figure 11
I(INx+SENSEx)
Sum of current drawn from IN and
SENSE pins
–0.1
RTHR = 0 Ω, RSENSE = 562 Ω ± 1%;
5 V < VSENSE < VIL, see Figure 11
1.9
2.5
RTHR = 0 Ω, RSENSE = 562 Ω ± 1%;
VIL < VSENSE < 30 V, see Figure 11
2.05
2.75
RTHR = 0 Ω, RSENSE = 562 Ω ± 1%;
30 V < VSENSE < 36 V, see Figure 11
2.1
2.83
RTHR = 0 Ω, RSENSE = 562 Ω ± 1%;
36 V < VSENSE < 60 V (1), see Figure 11
2.1
3.1
mA
RTHR = 0 Ω, RSENSE = 200 Ω ± 1%;
–60 V < VSENSE < 0 V, see Figure 11
(1)
µA
–0.1
µA
RTHR = 0 Ω, RSENSE = 200 Ω ± 1%;
5 V < VSENSE < VIL, see Figure 11
5.3
6.8
RTHR = 0 Ω, RSENSE = 200 Ω ± 1%;
VIL < VSENSE < 36 V (1), see Figure 11
5.5
7
RTHR = 0 Ω, RSENSE = 200 Ω ± 1%;
36 V < VSENSE < 60 V (1), see Figure 11
5.5
7.3
mA
See the Thermal Considerations section.
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Electrical Characteristics—DC Specification (continued)
(Over recommended operating conditions unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
VOLTAGE TRANSITION THRESHOLD ON FIELD SIDE
VIL
VIH
VHYS
Low level threshold voltage at module
input (including RTHR) for output low
High level threshold voltage at module
input (including RTHR) for output high
Threshold voltage hysteresis at module
input
RSENSE = 562 Ω, RTHR = 0 Ω, see Figure 11
6.5
7
RSENSE = 562 Ω, RTHR = 1 kΩ, see Figure 11
8.7
9.2
RSENSE = 562 Ω, RTHR = 4 kΩ, see Figure 11
15.2
15.8
V
RSENSE = 562 Ω, RTHR = 0 Ω, see Figure 11
8.2
8.55
RSENSE = 562 Ω, RTHR = 1 kΩ, see Figure 11
10.4
10.95
RSENSE = 562 Ω, RTHR = 4 kΩ, see Figure 11
17
18.25
RSENSE = 562 Ω, RTHR = 0 Ω, see Figure 11
1
1.2
RSENSE = 562 Ω, RTHR = 1 kΩ, see Figure 11
1
1.2
RSENSE = 562 Ω, RTHR = 4 kΩ, see Figure 11
1
1.2
V
V
6.10 Switching Characteristics—AC Specification
(Over recommended operating conditions unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tr, tf
Output signal rise and fall time,
OUTx pins
Input rise and fall times = 10 ns, see Figure 10
3
tPLH
Propagation delay time for low to
high transition
Input rise and fall times = 10 ns, see Figure 10
110
140
ns
tPHL
Propagation delay time for high
to low transition
Input rise and fall times = 10 ns, see Figure 10
10
15
ns
tsk(p)
Pulse skew |tPHL - tPLH|
Input rise and fall times = 10 ns, see Figure 10
102
130
ns
tUI
Minimum pulse width
Input rise and fall times = 125 ns, see Figure 10
tPHZ
Disable propagation delay, highto-high impedance output
See Figure 13
17
40
ns
tPLZ
Disable propagation delay, lowto-high impedance output
See Figure 12
17
40
ns
tPZH
Enable propagation delay, high
impedance-to-high output
See Figure 13
3
8.5
µs
tPZL
Enable propagation delay, high
impedance-to-low output
See Figure 12
17
40
ns
CMTI
Common mode transient
immunity
See Figure 14
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ns
150
25
ns
70
kV/µs
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6.11 Insulation Characteristics Curves
900
350
VCC1 = 2.75 V
VCC1 = 3.6 V
VCC1 = 5.5 V
VINx = 24 V
VINx = 36 V
VINx = 60 V
250
800
Safety Limiting Power (mW)
Safety Limiting Current (mA)
300
200
150
100
50
600
500
400
300
200
100
0
0
0
50
100
150
Ambient Temperature (qC)
0
200
50
D001
100
150
Ambient Temperature (qC)
200
D002
Figure 2. Thermal Derating Curve for Safety Limiting Power
per VDE for D-8 Package
Figure 1. Thermal Derating Curve for Safety Limiting
Current per VDE for D-8 Package
450
1200
350
300
Safety Limiting Power (mW)
VCC1 = 2.75 V
VCC1 = 3.6 V
VCC1 = 5.5 V
VINx = 24 V
VINx = 36 V
VINx = 60 V
400
Safety Limiting Current (mA)
700
250
200
150
100
1000
800
600
400
200
50
0
0
0
50
100
150
Ambient Temperature (qC)
200
0
D003
Figure 3. Thermal Derating Curve for Safety Limiting
Current per VDE for DBQ-16 Package
50
100
150
Ambient Temperature (qC)
200
D004
Figure 4. Thermal Derating Curve for Safety Limiting Power
per VDE for DBQ-16 Package
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6.12 Typical Characteristics
2.75
3
40qC
25qC
2.5
85qC
105qC
115qC
125qC
2.75
Input Current (mA)
2
1.5
1.25
1
0.75
ON = 8.25 V
1.75
OFF = 7.1 V
Input Current (mA)
2.25
±40°C
25°C
85°C
105°C
115°C
125°C
0.5
0.25
2.5
2.25
0
0
5
10
RSENSE = 562 Ω
15
20
Input Voltage (V)
25
2
30
30
RTHR = 0 Ω
-30
-10
RTHR = 2 k:
RTHR = 3 k:
10
45
50
Input Voltage (V)
RTHR = 4 k:
30
50
70
Temperature (qC)
90
55
60
D006
RTHR = 0 Ω
Figure 6. Input Current vs Input Voltage
Low-Level Threshold Voltage (V)
High-Level Threshold Voltage (V)
RTHR = 0 k:
RTHR = 1 k:
40
RSENSE = 562 Ω
Figure 5. Input Current vs Input Voltage
20
19
18
17
16
15
14
13
12
11
10
9
8
7
-50
35
110
130
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
-50
RTHR = 0 k:
RTHR = 1 k:
-30
-10
10
D007
RSENSE = 562 Ω
RTHR = 2 k:
RTHR = 3 k:
30
50
70
Temperature (qC)
RTHR = 4 k:
90
110
130
D008
RSENSE = 562 Ω
Figure 7. High-Level Voltage Transition Threshold vs
Ambient Temperature
Figure 8. Low-Level Voltage Transition Threshold vs
Ambient Temperature
7
Input Current (mA)
6
5
4
3
40qC
25qC
85qC
105qC
115qC
125qC
2
1
0
0
10
20
RSENSE = 200 Ω
30
40
Input Voltage (V)
50
60
70
D009
RTHR = 0 Ω
Figure 9. Input Current vs Input Voltage
14
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7 Parameter Measurement Information
7.1 Test Circuits
SENSE
18 V
VI
IN
Capacitive
Isolation
VCC1
0V
Signal
VI
100 nF
tPLH
VO
ILIM
tPHL
Generator
VO
OUT
50%
50%
RSENSE
90%
50%
10%
tr
FGND
VOH
50%
VOL
tf
CL
15 pF
GND1
Figure 10. Switching Characteristics Test Circuit and Voltage Waveforms
RTHR
SENSE
I(Inx+SENSEx)
VCC1
IN
Capacitive
Isolation
RSENSE
100 nF
Signal
OUT
VO
ILIM
VI
Generator
FGND
CL
15 pF
GND1
Figure 11. Input Current and Voltage Threshold Test Circuit
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Test Circuits (continued)
SENSE
VCC1
IN
Capacitive
Isolation
0V
RSENSE
VCC1
RL
1k
VCC1 / 2
VCC1 / 2
VI
tPZL
tPLZ
0V
VO
ILIM
VOH
OUT
FGND
VO
0.5 V
50%
VOL
CL
15 pF
EN1
GND1
Signal
Generator
VI
50
Figure 12. Enable and Disable Propagation Delay Time Test Circuit and Waveform—Logic Low State
16
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Test Circuits (continued)
SENSE
24 V
VCC1
VCC1
IN
Capacitive
Isolation
RSENSE
VCC1 / 2
VCC1 / 2
VI
0V
tPZH
VO
ILIM
VOH
OUT
CL
15 pF
RL
1k
50%
VO
FGND
0.5 V
0V
tPHZ
EN1
GND1
Signal
Generator
VI
50
Figure 13. Enable and Disable Propagation Delay Time Test Circuit and Waveform—Logic High State
S1
SENSE
24 V
VCC1
IN
Capacitive
Isolation
+
±
RSENSE
ILIM
100 nF
OUT
VOH or VOL
FGND
CL
15 pF
GND1
GND1
(1)
+ VCM ±
FGND
Pass Criterion: The output must remain stable.
Figure 14. Common-Mode Transient Immunity Test Circuit
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8 Detailed Description
8.1 Overview
The ISO1211 and ISO1212 devices are fully-integrated, isolated digital-input receivers with IEC 61131-2 Type 1,
2, and 3 characteristics. The devices receive 24-V to 60-V digital-input signals and provide isolated digital
outputs. No field-side power supply is required. An external resistor, RSENSE, on the input-signal path precisely
sets the limit for the current drawn from the field input based on an internal feedback loop. The voltage transition
thresholds are compliant with Type 1, 2, and 3 and can be increased further using an external resistor, RTHR. For
more information on selecting the RSENSE and RTHR resistor values, see the Detailed Design Procedure section.
The ISO121x devices use an ON-OFF keying (OOK) modulation scheme to transmit the digital data across a
silicon-dioxide based isolation barrier. The transmitter sends a high frequency carrier across the barrier to
represent one digital state and sends no signal to represent the other digital state. The receiver demodulates the
signal after advanced signal conditioning and produces the output through a buffer stage. The conceptual block
diagram of the ISO121x device is shown in the Functional Block Diagram section.
8.2 Functional Block Diagram
RTHR
RSENSE
IN
CURRENT
LIMIT
ISOLATION
SENSE
INPUT
OUT
REF
FGND
8.3 Feature Description
The ISO121x devices receive 24-V to 60-V digital input signals and provide isolated digital outputs. An external
resistor, RSENSE, connected between the INx and SENSEx pins, sets the limit for the current drawn from the field
input. Internal voltage comparators connected to the SENSEx pins determine the input-voltage transition
thresholds.
The output buffers on the control side are capable of providing enough current to drive status LEDs. The EN pin
is used to enable the output buffers. A low state on the EN pin puts the output buffers in a high-impedance state.
The ISO121x devices are capable of operating up to 4 Mbps. Both devices support an isolation withstand voltage
of 2500 VRMS between side 1 and side 2. Table 1 provides an overview of the device features.
Table 1. Device Features
18
PART NUMBER
CHANNELS
MAXIMUM DATA RATE
PACKAGE
RATED ISOLATION
ISO1211
1
4 Mbps
8-pin SOIC (D)
2500 VRMS,
3600 VPK
ISO1212
2
4 Mbps
16-pin SSOP (DBQ)
2500 VRMS,
3600 VPK
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8.4 Device Functional Modes
Table 2 lists the functional modes for the ISO121x devices.
Table 2. Function Table (1)
SIDE 1 SUPPLY
VCC1
PU
PD
(1)
(2)
INPUT
(INx, SENSEx)
OUTPUT ENABLE
(EN)
OUTPUT
(OUTx)
H
H or Open
H
L
H or Open
L
Open
H or Open
L
When INx and SENSEx are open, the output of the
corresponding channel goes to Low.
X
L
Z
A low value of output enable causes the outputs to
be high impedance.
X
X
Undetermined
COMMENTS
Channel output assumes the logic state of channel
input.
When VCC1 is unpowered, a channel output is
undetermined (2). When VCC1 transitions from
unpowered to powered up; a channel output
assumes the logic state of the input.
VCC1 = Side 1 power supply; PU = Powered up (VCC1 ≥ 2.25 V); PD = Powered down (VCC1 ≤ 1.7 V); X = Irrelevant; H = High level; L =
Low level; Z = High impedance
The outputs are in an undetermined state when 1.7 V < VCC1 < 2.25 V.
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The ISO1211 and ISO1212 devices are fully-integrated, isolated digital-input receivers with IEC 61131-2 Type 1,
2, and 3 characteristics. These devices are suitable for high-channel density, digital-input modules for
programmable logic controllers and motor control digital input modules. The devices receive 24-V to 60-V digitalinput signals and provide isolated digital outputs. No field side power supply is required. An external resistor,
RSENSE, on the input signal path precisely sets the limit for the current drawn from the field input. This current limit
helps minimize power dissipated in the system. The current limit can be set for Type 1, 2, or 3 operation. The
voltage transition thresholds are compliant with Type 1, 2, and 3 and can be increased further using an external
resistor, RTHR. For more information on selecting the RSENSE and RTHR resistor values, see the Detailed Design
Procedure section. The ISO1211 and ISO1212 devices are capable of high speed operation and can pass
through a minimum pulse width of 150 ns. The ISO1211 device has a single receive channel. The ISO1212
device has two receive channels that are independent on the field side.
Type 1
Type 2
30
30
30
25
25
25
ON
ON
15
10
15
10
5
0
5
10
IIN (mA)
5
OFF
0
±3
15
15
10
5
OFF
0
±3
ON
20
VIN (V)
20
VIN (V)
20
VIN (V)
Type 3
0
5
10
15
IIN (mA)
OFF
0
±3
20
25
30
0
5
10
IIN (mA)
15
Figure 15. Switching Characteristics for IEC61131-2 Type 1, 2, and 3 Proximity Switches
9.2 Typical Application
9.2.1 Sinking Inputs
Figure 16 shows the design for a typical multichannel, isolated digital-input module with sinking inputs. Pushbutton switches, proximity sensors, and other field inputs connect to the host controller through an isolated
interface. The design is easily scalable from a few channels, such as 4 or 8, to many channels, such as 256 or
more. The RSENSE resistor limits the current drawn from the input pins. The RTHR resistor is used to adjust the
voltage thresholds and limit the peak current during surge events. The CIN capacitor is used to filter noise on the
input pins. For more information on selecting RSENSE, RTHR, and CIN, see the Detailed Design Procedure section.
The ISO121x devices derive field-side power from the input pins which eliminates the requirement for a fieldside, 24-V input power supply to the module. Similarly, an isolated dc-dc converter creating a field-side power
supply from the controller side back plane supply is also eliminated which improves flexibility of system design
and reduces system cost.
For systems requiring channel-to-channel isolation on the field side, use the ISO1211 device as shown in
Figure 17.
20
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Typical Application (continued)
PLC Digital Input Module
Field Side
PLC
5 V or 3.3 V or 2.5 V
Backplane supply
ISO1212
RTHR
SENSE1
CIN
RSENSE
VCC1
VCC
OUT1
IN1
FGND1
RTHR
SENSE2
CIN
24 V
RSENSE
OUT2
IN2
Power
Supply
FGND2
GND1
Host
Controller
0V
Sensors and
Switches
ISO1212
RTHR
SENSE1
CIN
VCC1
RSENSE
IN1
OUT1
FGND1
RTHR
SENSE2
CIN
RSENSE
Field Ground
(FGND)
IN2
OUT2
FGND2
GND1
GND
500 pF/2 kV
Protection
Earth (PE)
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Figure 16. Typical Application Schematic With Sinking Inputs
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Typical Application (continued)
5 V or 3.3 V or 2.5 V
Backplane Supply
ISO1211
RTHR
24 V
CIN
+
SENSE
VCC1
IN
OUT
VCC
RSENSE
±
FGND
GND1
Host
Controller
ISO1211
RTHR
24 V
+
CIN
SENSE
VCC1
IN
OUT
RSENSE
±
FGND
GND1
GND
Copyright © 2017, Texas Instruments Incorporated
Figure 17. Single-Channel or Channel-to-Channel Isolated Designs With ISO1211
9.2.1.1 Design Requirements
The ISO121x devices require two resistors, RTHR and RSENSE, and a capacitor, CIN, on the field side. For more
information on selecting RSENSE, RTHR, and CIN, see the Detailed Design Procedure section. A 100-nF decoupling
capacitor is required on VCC1.
9.2.1.2 Detailed Design Procedure
9.2.1.2.1 Setting Current Limit and Voltage Thresholds
The RSENSE resistor limits the current drawn from the field input. A value of 562 Ω for RSENSE is recommended for
Type 1 and Type 3 operation, and results in a current limit of 2.25 mA (typical). A value of 200 Ω for RSENSE is
recommended for Type 2 operation, and results in a current limit of 6 mA (typical). In each case, a (slightly) lower
value of RSENSE can be selected based on the need for a higher current limit or component availability. For more
information, see the Electrical Characteristics—DC Specification table and Typical Characteristics section. A 1%
tolerance is recommended on RSENSE but 5% resistors can also be used if higher variation in the current limit
value is acceptable. The relationship between the RSENSE resistor and the typical current limit (IL) is given by
Equation 1.
2.25 mA u 562 :
IL
RSENSE
(1)
The RTHR resistor sets the voltage thresholds (VIL and VIH) as well as limits the surge current. A value of 1 kΩ is
recommended for RTHR in Type 3 systems (maximum threshold voltage required is 11 V). A value of 2.5 kΩ is
recommended for RTHR in Type 1 systems (maximum threshold voltage required is 15 V) and a value of 330 Ω is
recommended for RTHR in Type 2 systems. The Electrical Characteristics—DC Specification table lists and the
Typical Characteristics section describes the voltage thresholds with different values of RTHR. For other values of
RTHR, derive the values through linear interpolation. Use Equation 2 and Equation 3 to calculate the values for
the typical VIH values and minimum VIL values, respectively.
2.25 mA u 562 :
VIH (typ) 8.25 V RTHR u
RSENSE
(2)
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Typical Application (continued)
VIL (typ)
7.1 V RTHR u
2.25 mA u 562 :
RSENSE
(3)
The maximum voltage on the SENSE pins of the ISO121x device is 60 V. However, because the RTHR resistor
drops additional voltage, the maximum voltage supported at the module inputs is higher and given by Equation 4.
2.1 mA u 562 :
VIN (max) 60 V RTHR u
RSENSE
(4)
Use the ISO121x Threshold Calculator for 9V to 300V DC and AC Voltage Detection to estimate the values of
the voltage transition thresholds, the maximum-allowed module input voltage, and module input current for the
given values of the RSENSE and RTHR resistors.
A value of 0 Ω for RTHR also meets Type 1, Type 2 and Type 3 voltage-threshold requirements. The value of
RTHR should be maximized for best EMC performance while meeting the desired input voltage thresholds.
Because RTHR is used to limit surge current, 0.25 W MELF resistors must be used.
Figure 18 shows the typical input current characteristics and voltage transition thresholds for 562-Ω RSENSE and
1-kΩ RTHR.
2.75
2.5
2
1.5
1.25
1
0.75
ON = 8.25 V
1.75
OFF = 7.1 V
Input Current (mA)
2.25
±40°C
25°C
85°C
105°C
115°C
125°C
0.5
0.25
0
0
5
10
15
20
Input Voltage (V)
25
30
Figure 18. Transition Thresholds
9.2.1.2.2 Thermal Considerations
Thermal considerations constrain operation at different input current and voltage levels. The power dissipated
inside the ISO121x devices is determined by the voltage at the SENSE pin (VSENSE) and the current drawn by the
device (I(INx+SENSEx)). The internal power dissipated, when taken with the junction-to-air thermal resistance defined
in the Thermal Information table can be used to determine the junction temperature for a given ambient
temperature. The junction temperature must not exceed 150°C.
Figure 19 shows the maximum allowed ambient temperature for the ISO1211 device for different current limit and
input voltage conditions. The ISO1211 device can be used with a VSENSE voltage up to 60 V and an ambient
temperature of up to 125°C for an RSENSE value of 562 Ω, which corresponds to a typical current limit of 2.25 mA.
At higher levels of current limit, either the ambient temperature or the maximum value of the VSENSE voltage must
be derated. In any design, the voltage drop across the external series resistor, RTHR, reduces the maximum
voltage received by the SENSE pin and helps extend the allowable module input voltage and ambient
temperature range.
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Typical Application (continued)
Maximum Ambient Temperature (qC)
130
125
120
115
110
105
100
95
90
85
RSENSE = 562 :, IL = 2.25 mA
RSENSE = 400 :, IL = 3.2 mA
RSENSE = 200 :, IL = 6.3 mA
80
75
70
0
(1)
10
20
30
40
50
Voltage at SENSE (V)
60
70
80
D011
This figure also applies to the ISO1212 device if only one of the two channels are expected to be active at a given
time.
Figure 19. Maximum Ambient Temperature Derating Curve for ISO1211 vs VSENSE
Figure 20 shows the maximum allowed ambient temperature for the ISO1212 device for different current limit and
input voltage conditions. The ISO1212 device can be used with a VSENSE voltage up to 36 V and an ambient
temperature of up to 125°C for an RSENSE value of 562 Ω, which corresponds to a typical current limit of 2.25 mA.
At higher current limit levels, either the ambient temperature or the maximum value of the VSENSE voltage must
be derated. Operation of the ISO1212 device with an RSENSE value of 200 Ω and with both channels active is not
recommended beyond a VSENSE voltage of 36 V. In any design, the voltage drop across the series resistor, RTHR,
reduces the maximum voltage received by the SENSE pin and helps extend the allowable module input voltage
and ambient temperature range.
Maximum Ambient Temperature (qC)
130
125
120
115
110
105
100
95
90
85
RSENSE = 562 :, IL = 2.25 mA
RSENSE = 400 :, IL = 3.2 mA
RSENSE = 200 :, IL = 6.3 mA
80
75
70
0
(1)
10
20
30
40
50
Voltage at SENSE (V)
60
70
80
D012
This figure only applies if both channels of the ISO1212 device are expected to be on at the same time. If only one
channel is expected to be on at a given time, refer to Figure 19.
Figure 20. Maximum Ambient Temperature Derating Curve for ISO1212 vs VSENSE
24
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Typical Application (continued)
9.2.1.2.3 Designing for 48-V Systems
The ISO121x devices are suitable for 48-V digital input receivers. The current limit, voltage transition thresholds,
and maximum voltage supported at the module input are governed by Equation 1, Equation 2, Equation 3, and
Equation 4. For 48-V systems, a threshold voltage close to 25 V is desirable. The RTHR resistor can be adjusted
to achieve this higher threshold. For example, with an RSENSE value of 562 Ω and an RTHR value of 7.5 k Ω, a VIH
value of approximately 25 V can be achieved. With this setting, the RTHR resistor drops a voltage of
approximately 17 V, reducing the maximum value of the VSENSE voltage for any given module input voltage. This
drop vastly increases the allowable module input voltage and ambient temperature range as discussed in
Thermal Considerations.
9.2.1.2.4 Designing for Input Voltages Greater Than 60 V
The ISO121x devices are rated for 60 V on the SENSE and IN pins with respect to FGND. However, larger
voltages on the module input can be supported by dropping extra voltage across an external resistor, RTHR.
Because the current drawn by the SENSE and IN pins is well controlled by the built-in current limit, the voltage
drop across RTHR is well controlled as well. However, increasing the RTHR resistance also correspondingly raises
the voltage transition threshold. An additional resistor, RSHUNT (see Figure 21), provides the flexibility to change
the voltage transition thresholds independently of the maximum input voltage. The current through the RSHUNT
resistor is less near the voltage transition threshold, but increases with the input voltage, increasing the voltage
drop across the RTHR resistor, and preventing the voltage on the ISO121x pins from exceeding 60 V. With the
correct value selected for the RTHR and RSHUNT resistors, the voltage transition thresholds and the maximum input
voltage supported can be adjusted independently.
A 1-nF or greater CIN capacitor is recommended between the SENSE and FGND pins to slow down the
transitions on the SENSE pin, and to prevent overshoot beyond 60 V during transitions.
For more information, refer to the How to Design Isolated Comparators for ±48V, 110V and 240V DC and AC
Detection TI TechNote. Use the ISO121x Threshold Calculator for 9V to 300V DC and AC Voltage Detection to
estimate the values of voltage transition thresholds, the maximum-allowed module input voltage, and module
input current for given values of the RSENSE, RTHR, and RSHUNT resistors.
ISO1211
RTHR
SENSE
VIN
VCC1
RSENSE
+
RSHUNT
±
CIN
OUT
IN
FGND
GND1
Figure 21. Increase ISO121x Input Voltage Range With RSHUNT
Another way to increase the maximum module input voltage without changing the voltage transition thresholds is
to use a 60-V Zener diode to limit the voltage on the ISO121x pins to less than 60 V as shown in Figure 22. In
this case, when the module input is greater than 60 V, the Zener diode must be designed to sink the additional
current, and the RTHR resistor must be designed to drop a higher voltage.
For example, with a 2.5-kΩ RTHR and 560-Ω RSENSE, the voltage transition threshold is 15 V, and the ISO121x
input current is 2.25 mA. If the module voltage reaches 100 V, the voltage drop across the RTHR resistor is 40 V,
and the current through the Zener diode is approximately 14 mA.
ISO1211
RTHR
SENSE
VIN
+
±
VCC1
RSENSE
60 V
CIN
IN
FGND
OUT
GND1
Figure 22. Increase ISO121x Input Voltage Range Using a Zener Diode
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Typical Application (continued)
9.2.1.2.5 Surge, ESD, and EFT Tests
Digital input modules are subject to surge (IEC 61000-4-5), electrostatic discharge or ESD (IEC 61000-4-2) and
electrical fast transient or EFT (IEC 61000-4-4) tests. The surge impulse waveform has the highest energy and
the widest pulse width, and is therefore the most stringent test of the three.
Figure 16 shows the application diagram for Type 1 and 3 systems. For a 1-kVPP surge test between the input
terminals and protection earth (PE), a value of 1 kΩ for RTHR and 10 nF for CIN is recommended. Table 3 lists a
summary of recommended component values to meet different levels of EMC requirements for Type 1 and 3
systems.
Table 3. Surge, IEC ESD and EFT
IEC 61131-2
TYPE
RSENSE
RTH
CIN
Type 1
562
2.5 kΩ
Type 3
562
1 kΩ
SURGE
IEC ESD
IEC EFT
±1 kV
±6 kV
±4 kV
±500 V
±6 kV
±4 kV
±6 kV
±4 kV
LINE-TO-PE
LINE-TO-LINE
LINE-TO-FGND
10 nF
±1 kV
±1 kV
10 nF
±1 kV
±1 kV
330 nF
±1 kV
±1 kV
±1 kV
Figure 23 shows the test setup and application circuit used for surge testing. A noise filtering capacitor of 500 pF
is recommended between the FGND pin and PE (earth). The total value of effective capacitance between the
FGND pin and any other ground potential (including PE) must not exceed 500 pF for optimum surge
performance. For line-to-PE test (common-mode test), the FGND pin is connected to the auxiliary equipment
(AE) through a decoupling network.
26
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5 V or 3.3 V or 2.5 V
Backplane supply
20 mH
ISO1212
RTHR
IN1
SENSE1
CIN
RSENSE
VCC1
VCC
OUT1
IN1
FGND1
20 mH
RTHR
IN2
SENSE2
CIN
RSENSE
OUT2
IN2
FGND2
Host
Controller
Decoupling
Network
20 mH
INN
Line-to-PE
ISO1212
INN-1
RTHR
SENSE1
Line-to-FGND
20 mH
Line-to-Line
Auxiliary
Equipment
(AE)
CIN
VCC1
RSENSE
IN1
OUT1
FGND1
RTHR
SENSE2
CIN
RSENSE
Field Ground
(FGND)
20 mH
GND1
IN2
OUT2
FGND2
GND1
GND
FGND(1)
500 pF(2)
2 kV
PE
Protection
Earth (PE)
PE
Copyright © 2017, Texas Instruments Incorporated
(1)
For line-to-PE test, FGND is connected to the auxiliary equipment (AE) through a decoupling network.
(2)
A noise filtering capacitor of about 500 pF is recommended between the FGND pin and PE (earth). The total value of
effective capacitance between the FGND pin and any other ground potential (including PE) must not exceed 500 pF
for optimum performance.
Figure 23. Setup and Application Circuit Used for Surge Test
For higher voltage levels of surge tests or for faster systems that cannot use a large value for CIN, TVS diodes or
varistors can be used to meet EMC requirements. Type 2 systems that use a smaller value for RTHR may also
require TVS diodes or varistors for surge protection. Figure 24 shows an example usage of TVS diodes for surge
protection. The recommended components for surge protection are VCAN26A2-03S (TVS, Vishay), EZJP0V420WM (Varistor, Panasonic), and GSOT36C (TVS, Vishay).
Use of the RTHR resistor also reduces the peak current requirement for the TVS diodes, making them smaller and
cost effective. For example, a 2-kV surge through a 1-kΩ RTHR resistor creates only 2-A peak current. Also,
because of voltage drop across the RTHR resistor in normal operation, the working voltage requirement for the
varistor or TVS diodes is reduced. For example, for a RTHR value of 1 kΩ and an RSENSE value of 562 Ω, a
module designed for 30-V inputs only requires 28-V TVS diodes because the RTHR resistor drops more than 2 V.
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5 V or 3.3 V or 2.5 V
Backplane Supply
ISO1211
RTHR
24 V
SENSE
VCC1
IN
OUT
VCC
RSENSE
TVS
0V
FGND
Host
Controller
GND
GND1
Copyright © 2017, Texas Instruments Incorporated
Figure 24. TVS Diodes Used Instead of a Filtering Capacitor for Surge Protection in Faster Systems
9.2.1.2.6 Multiplexing the Interface to the Host Controller
The ISO121x devices provide an output-enable pin on the controller side (EN). Setting the EN pin to 0 causes
the output buffers to be in the high-impedance state. This feature can be used to multiplex the outputs of multiple
ISO121x devices on the same host-controller input, reducing the number of pins on the host controller.
In the example shown in Figure 25, two sets of 8-channel inputs are multiplexed, reducing the number of input
pins required on the controller from 16 to 10. Similarly, if four sets of 8-channel inputs are multiplexed, the
number of pins on the controller is reduced from 32 to 12.
ISO1212
IN1
ISO1212
RTHR
RTHR
SENSE1
SENSE1
RSENSE
IN2
RSENSE
OUT1
OUT1
IN1
RTHR
SENSE2
IN2
OUT2
ISO1212
RTHR
RTHR
RSENSE
RSENSE
SENSE1
SENSE1
IN1
RTHR
IN15
RSENSE
OUT1
OUT1
IN1
RTHR
SENSE2
SENSE2
IN2
IN10
RSENSE
EN
ISO1212
IN8
RTHR
IN2
OUT2
EN
IN7
IN1
SENSE2
IN9
RSENSE
IN16
RSENSE
OUT2
OUT2
IN2
EN
EN2
DIN8
DIN7
DIN2
DIN1
EN1
EN
Host
Controller
Copyright © 2017, Texas Instruments Incorporated
Figure 25. Using the Output Enable Option to Multiplex the Interface to the Host Controller
9.2.1.2.7 Status LEDs
The outputs of the ISO121x devices can be used to drive status LEDs on the controller side as shown in
Figure 26. The output buffers of the ISO121x can provide 4-mA, 3-mA, and 2-mA currents while working at VCC1
values of 5 V, 3.3 V, and 2.5 V respectively.
28
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In some cases, placing the LED on the field side is desirable although it is powered from VCC1. In such cases, the
signal carrying current to the LED can be routed in an inner layer without compromising the isolation of the
digital-input module. For more information, see the Layout Guidelines section.
5 V or 3.3 V or 2.5 V
Backplane Supply
ISO1211
RTHR
24 V
CIN
Power
Supply
0V
SENSE
VCC1
IN
OUT
VCC
RSENSE
FGND
Host
Controller
GND
GND1
Status
LED
Copyright © 2017, Texas Instruments Incorporated
Figure 26. Using ISO121x Outputs to Drive Status LEDs
9.2.1.3 Application Curve
2.75
2.5
2
1.5
1.25
1
0.75
ON = 8.25 V
1.75
OFF = 7.1 V
Input Current (mA)
2.25
±40°C
25°C
85°C
105°C
115°C
125°C
0.5
0.25
0
0
5
10
15
20
Input Voltage (V)
25
30
RSENSE = 562 Ω
RTHR = 0 Ω
Figure 27. Input Current vs Input Voltage
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9.2.2 Sourcing Inputs
The ISO121x devices can be configured as sourcing inputs as shown in Figure 28. In this configuration, all the
SENSE pins are connected to the common voltage (24 V), and the inputs are connected to the individual FGND
pins.
24-V
Common
5 V or 3.3 V or 2.5 V
Backplane supply
ISO1212
SENSE1
CIN
RSENSE
VCC
OUT1
IN1
RTHR
VCC1
FGND1
Current Flow
SENSE2
CIN
24 V
RSENSE
Power
Supply
OUT2
IN2
RTHR
FGND2
GND1
0V
Host
Controller
ISO1212
SENSE1
Sensors and
Switches
CIN
VCC1
RSENSE
IN1
RTHR
OUT1
FGND1
Current Flow
SENSE2
CIN
RSENSE
RTHR
IN2
OUT2
FGND2
GND1
GND
500 pF/2 kV
PE
Protection
Earth (PE)
Copyright © 2017, Texas Instruments Incorporated
Figure 28. Typical Application Circuit With Sourcing Inputs
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9.2.3 Sourcing and Sinking Inputs (Bidirectional Inputs)
The ISO1212 device can be used to create a bidirectional input module that can sink and source current as
shown in Figure 29. In this configuration, channel 1 is active if the COM terminal is connected to ground for
sinking inputs, and channel 2 is active if the COM terminal is connected to 24 V for sourcing input. The digital
input is considered high if either the OUT1 or OUT2 pin is high.
5 V or 3.3 V or 2.5 V
Backplane supply
IN
ISO1212
RTHR
SENSE1
CIN
VCC
VCC1
RSENSE
OUT1
IN1
FGND1
Host
Controller
SENSE2
±24 V
RSENSE
OUT2
IN2
GND1
FGND2
GND
COM
Current for positive polarity
Current for negative polarity
Copyright © 2017, Texas Instruments Incorporated
Figure 29. Application Circuit—ISO1212 With Sourcing and Sinking Inputs
A bidirectional input module can also be built with the ISO121x devices using low-cost Schottky diodes as shown
in Figure 30.
IN
RTHR
BAT54CLT1G
ISO1211
±24 V
SENSE
VCC1
RSENSE
COM
CIN
Host
Controller
OUT
IN
FGND
GND1
Figure 30. Bidirectional Implementation With ISO1211 and Bridge Rectifier
10 Power Supply Recommendations
To help ensure reliable operation at data rates and supply voltages, a 0.1-μF bypass capacitor is recommended
on the side 1 supply pin (VCC1). The capacitor should be placed as close to the supply pins as possible.
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11 Layout
11.1 Layout Guidelines
The board layout for ISO1211 and ISO1212 can be completed in two layers. On the field side, place RSENSE, CIN,
and RTHR on the top layer. Use the bottom layer as the field ground (FGND) plane. TI recommends using RSENSE
and CIN in 0603 footprint for a compact layout, although larger sizes (0805) can also be used. The CIN capacitor
is a 50-V capacitor and is available in the 0603 footprint. Keep CIN as close to the ISO121x device as possible.
The SUB pin on the ISO1211 device and the SUB1 and SUB2 pins on the ISO1212 device should be left
unconnected. For group isolated design, use vias to connect the FGND pins of the ISO121x device to the bottom
FGND plane. The placement of the RTHR resistor is flexible, although the resistor pin connected to external high
voltage should not be placed within 4 mm of the ISO121x device pins or the CIN and RSENSE pins to avoid
flashover during EMC tests.
Only a decoupling capacitor is required on side 1. Place this capacitor on the top-layer, with the bottom layer for
GND1.
If a board with more than two layers is used, placing two ISO121x devices on the top-and bottom layers (back-toback) is possible to achieve a more compact board. The inner layers can be used for FGND.
Figure 31 and Figure 32 show the example layouts.
In some designs, placing the LED on the field side is desirable although it is powered from VCC1. In such cases,
the signal carrying current to the LED can be routed in an inner layer without compromising the isolation of the
digital-input module as shown in Figure 33. The LED must be placed with at least 4-mm spacing between other
components and connections on side 1 to ensure adequate isolation.
11.2 Layout Example
2 mm maximum
from VCC
VCC
RTHR
0.1 F
C
VCC1
GND1
Plane
GND1
Isolation Capacitor
C
CIN
OUT
R
IN
RSENSE
EN
MCU
R
SENSE
High Voltage Input
FGND
SUB
FGND
Plane
Figure 31. Layout Example With ISO1211
32
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Layout Example (continued)
2 mm Maximum
from VCC
VCC
INP1
R
EN
OUT1
MCU
OUT2
NC
RTHR
FGND
FGND
SUB1
High Voltage
Input
RTHR
SUB2
INP2
R
SENSE1
IN1
R
FGND
GND1
C
C
CIN
GND1
Plane
IN1
RSENSE
NC
Isolation Capacitor
VCC1
R
SENSE1
GND1
CIN
C
RSENSE
0.1 F
FGND
Plane
Figure 32. Layout Example With ISO1212
2 mm maximum
from VCC
VCC
RTHR
0.1 F
C
VCC1
GND1
R
Isolation Capacitor
IN
C
CIN
OUT
R
RSENSE
EN
MCU
R
SENSE
High Voltage Input
FGND
SUB
4 mm minimum
FGND
Plane
LED
GND1
Plane
Figure 33. Layout Example With LED Placed on the Field Side But Driven From VCC1 Power Domain
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12 Device and Documentation Support
12.1 Device Support
12.1.1 Development Support
For development support, refer to:
• Sub 1-W, 16-Channel, Isolated Digital Input Module Reference Design
• Broken Wire Detection Using An Optical Switch Reference Design
• Redundant Dual Channel Reference Design for Safe Torque Off in Variable Speed Drives
12.2 Documentation Support
12.2.1 Related Documentation
For related documentation see the following:
• Texas Instruments, How To Improve Speed and Reliability of Isolated Digital Inputs in Motor Drives TI
TechNote
• Texas Instruments, How to Design Isolated Comparators for ±48V, 110V and 240V DC and AC Detection TI
TechNote
• Texas Instruments, How To Simplify Isolated 24-V PLC Digital Input Module Designs TI TechNote
• Texas Instruments, Isolation Glossary
• Texas Instruments, ISO121x Threshold Calculator for 9V to 300V DC and AC Voltage Detection
• Texas Instruments, ISO1211 Isolated Digital-Input Receiver Evaluation Module user's guide
• Texas Instruments, ISO1212 Isolated Digital-Input Receiver Evaluation Module user's guide
12.3 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to order now.
Table 4. Related Links
PARTS
PRODUCT FOLDER
ORDER NOW
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
ISO1211
Click here
Click here
Click here
Click here
Click here
ISO1212
Click here
Click here
Click here
Click here
Click here
12.4 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.5 Community Resource
TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight
from the experts. Search existing answers or ask your own question to get the quick design help you need.
Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do
not necessarily reflect TI's views; see TI's Terms of Use.
12.6 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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12.7 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
12.8 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical packaging and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
ISO1211D
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
1211
ISO1211DR
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
1211
ISO1212DBQ
ACTIVE
SSOP
DBQ
16
75
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
1212
ISO1212DBQR
ACTIVE
SSOP
DBQ
16
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
1212
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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