TI ISO721QDRQ1 3.3-v / 5-v high-speed digital isolator Datasheet

ISO721-Q1
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3.3-V / 5-V HIGH-SPEED DIGITAL ISOLATORS
FEATURES
1
•
•
•
Qualified for Automotive Applications
4000-V(peak) Isolation
– UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2),
IEC 61010-1
– 50-kV/s Transient Immunity (Typ)
Signaling Rate 0 Mbps to 150 Mbps
– Low Propagation Delay
– Low Pulse Skew
(Pulse-Width Distortion)
•
•
•
•
•
Low-Power Sleep Mode
High Electromagnetic Immunity
Low Input Current Requirement
Failsafe Output
Drop-In Replacement for Most Optical and
Magnetic Isolators
DESCRIPTION
The ISO721 is a digital isolator with a logic input and output buffer separated by a silicon oxide (SiO2) insulation
barrier. This barrier provides galvanic isolation of up to 4000 V. Used in conjunction with isolated power supplies,
this device prevents noise currents on a data bus or other circuits from entering the local ground, and interfering
with or damaging sensitive circuitry.
A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation
barrier. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or
resets a flip-flop and the output circuit accordingly. A periodic update pulse is sent across the barrier to ensure
the proper dc level of the output. If this dc refresh pulse is not received for more than 4 µs, the input is assumed
to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state.
FUNCTION DIAGRAM
DC Channel
Isolation Barrier
+
_
OSC
+
PWM
Vref
_
+
POR
IN
Input
+
Filter
BIAS
+
_
Vref
_
Filter
Pulse Width
Demodulation
Carrier Detect
POR
Data MUX
AC Detect
3-State
Output Buffer
OUT
+
AC Channel
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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DESCRIPTION (CONTINUED)
The symmetry of the dielectric and capacitor within the integrated circuitry provides for close capacitive matching
and allows fast transient voltage changes between the input and output grounds without corrupting the output.
The small capacitance and resulting time constant provide for fast operation with signaling rates(1) from 0 Mbps
(dc) to 100 Mbps.
The device requires two supply voltages of 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when
supplied from a 3.3-V supply, and all outputs are 4-mA CMOS. The device has a TTL input threshold and a
noise-filter at the input that prevents transient pulses of up to 2 ns in duration from being passed to the output of
the device.
The ISO721 is characterized for operation over the ambient temperature range of –40°C to 125°C.
(1) The signaling rate of a line is the number of voltage transitions that are made per second expressed in
the units bps (bits per second).
VCC1 1
IN 2
VCC1 3
GND1 4
Isolation
D PACKAGE
(TOP VIEW)
8 VCC2
7 GND2
6 OUT
5 GND2
ORDERING INFORMATION (1)
PACKAGE (2)
TA
–40°C to 125°C
(1)
(2)
SOIC – D
ORDERABLE PART NUMBER
Reel of 2500
ISO721QDRQ1
TOP-SIDE MARKING
IS721Q
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
REGULATORY INFORMATION
VDE
CSA
UL
Certified according to IEC 60747-5-2
Approved under CSA Component
Acceptance Notice: CA-5A
Recognized under 1577
Component Recognition Program (1)
File Number: 40016131
File Number: 1698195
File Number: E181974
(1)
2
Production tested ≥ 3000 VRMS for 1 second in accordance with UL 1577.
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ABSOLUTE MAXIMUM RATINGS (1)
VCC
Supply voltage (2), VCC1, VCC2
–0.5 V to 6 V
VI
Voltage at IN or OUT terminal
–0.5 V to 6 V
IO
Output current
TJ
Maximum virtual-junction temperature
ESD
(1)
(2)
(3)
(4)
±15 mA
170°C
Human-Body Model
Electrostatic discharge rating
(3)
±2 kV
Charged-Device Model (4)
±1 kV
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltage values except differential I/O bus voltages are with respect to network ground terminal and are peak voltage values. Vrms
values are not listed in this publication.
JEDEC Standard 22, Test Method A114-C.01
JEDEC Standard 22, Test Method C101
RECOMMENDED OPERATING CONDITIONS
MIN
MAX
3
5.5
(1)
VCC
Supply voltage
IOH
High-level output current
IOL
Low-level output current
–4
mA
tui
Input pulse width
10
ns
VIH
High-level input voltage (IN)
2
VCC
VIL
Low-level input voltage (IN)
0
0.8
V
TA
Operating free-air temperature
–40
125
°C
TJ
Operating virtual-junction temperature
H
External magnetic field intensity per IEC 61000-4-8 and IEC 61000-4-9 certification
(1)
, VCC1, VCC2
UNIT
V
4
See the Thermal Characteristics table
mA
V
150
°C
1000
A/m
For 5-V operation, VCC1 or VCC2 is specified from 4.5 V to 5.5 V. For 3.3-V operation, VCC1 or VCC2 is specified from 3 V to 3.6 V.
IEC 60747-5-2 INSULATION CHARACTERISTICS (1)
over recommended operating conditions (unless otherwise noted)
PARAMETER
VIORM
VPR
TEST CONDITIONS
SPECIFICATIONS
UNIT
560
V
After Input/Output Safety Test Subgroup 2/3
VPR = VIORM × 1.2, t = 10 s,
Partial discharge < 5 pC
672
V
Method a, VPR = VIORM × 1.6,
Type and sample test with t = 10 s,
Partial discharge < 5 pC
896
V
Method b1, VPR = VIORM × 1.875,
100 % Production test with t = 1 s,
Partial discharge < 5 pC
1050
V
Maximum working insulation voltage
Input to output test voltage
VIOTM
Transient overvoltage
t = 60 s
4000
V
RS
Insulation resistance
VIO = 500 V at TS
>109
Ω
Pollution degree
(1)
2
Climatic Classification 40/125/21
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ELECTRICAL CHARACTERISTICS: VCC1 and VCC2 5-V (1) OPERATION
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Quiescent
ICC1
VCC1 supply current
ICC2
VCC2 supply current
VOH
High-level output voltage
VOL
Low-level output voltage
VI(HYS)
Input voltage hysteresis
IIH
High-level input current
IN at 2 V
IIL
Low-level input current
IN at 0.8 V
CI
Input capacitance to ground
IN at VCC, VI = 0.4 sin (4E6πt)
CMTI
Common-mode transient immunity
VI = VCC or 0 V, See Figure 3
(1)
25 Mbps
Quiescent
25 Mbps
MIN
VI = VCC or 0 V, No load
VI = VCC or 0 V, No load
TYP
MAX
0.5
1
2
4
8
12
10
14
IOH = -4 mA, See Figure 1
VCC – 0.8
4.6
IOH = –20 µA, See Figure 1
VCC – 0.1
5
mA
mA
V
IOL = 4 mA, See Figure 1
0.2
0.4
IOL = 20 µA, See Figure 1
0
0.1
150
V
mV
10
–10
15
UNIT
µA
1
pF
50
kV/µs
For 5-V operation, VCC1 or VCC2 is specified from 4.5 V to 5.5 V. For 3.3-V operation, VCC1 or VCC2 is specified from 3 V to 3.6 V.
SWITCHING CHARACTERISTICS: VCC1 and VCC2 5-V OPERATION
over recommended operating conditions (unless otherwise noted)
TYP
MAX
tPLH
Propagation delay, low-to-high-level output
PARAMETER
See Figure 1
17
24
ns
tPHL
Propagation delay , high-to-low-level output
See Figure 1
17
24
ns
tsk(p)
Pulse skew |tPHL – tPLH|
See Figure 1
0.5
2
ns
tsk(pp) (1)
Part-to-part skew
0
3
ns
tr
Output signal rise time
See Figure 1
1
tf
Output signal fall time
See Figure 1
1
ns
tfs
Failsafe output delay time from input power loss
See Figure 2
3
µs
100-Mbps NRZ data input,
See Figure 4
2
100-Mbps unrestricted bit run length
data input, See Figure 4
3
tjit(PP)
(1)
4
Peak-to-peak eye-pattern jitter
TEST CONDITIONS
MIN
UNIT
ns
ns
tsk(PP) is the magnitude of the difference in propagation delay times between any specified terminals of two devices when both devices
operate with the same supply voltages, at the same temperature, and have identical packages and test circuits.
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ELECTRICAL CHARACTERISTICS: VCC1 at 5-V, VCC2 at 3.3-V (1) OPERATION
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Quiescent
ICC1
VCC1 supply current
ICC2
VCC2 supply current
VOH
High-level output voltage
VOL
Low-level output voltage
VI(HYS)
Input voltage hysteresis
IIH
High-level input current
IN at 2 V
IIL
Low-level input current
IN at 0.8 V
CI
Input capacitance to ground
IN at VCC, VI = 0.4 sin (4E6πt)
CMTI
Common-mode transient immunity
VI = VCC or 0 V, See Figure 3
(1)
25 Mbps
Quiescent
25 Mbps
MIN
VI = VCC or 0 V, No load
VI = VCC or 0 V, No load
TYP
MAX
0.5
1
2
4
4
6.5
5
7.5
IOH = –4 mA, See Figure 1
VCC – 0.4
3
IOH = –20 µA, See Figure 1
VCC – 0.1
3.3
mA
mA
V
IOL = 4 mA, See Figure 1
0.2
0.4
IOL = 20 µA, See Figure 1
0
0.1
150
V
mV
10
µA
µA
–10
15
UNIT
1
pF
40
kV/µs
For 5-V operation, VCC1 or VCC2 is specified from 4.5 V to 5.5 V. For 3.3-V operation, VCC1 or VCC2 is specified from 3 V to 3.6 V.
SWITCHING CHARACTERISTICS: VCC1 at 5-V, VCC2 at 3.3-V OPERATION
over recommended operating conditions (unless otherwise noted)
TYP
MAX
tPLH
Propagation delay, low-to-high-level output
PARAMETER
See Figure 1
19
30
ns
tPHL
Propagation delay , high-to-low-level output
See Figure 1
19
30
ns
tsk(p)
Pulse skew |tPHL – tPLH|
See Figure 1
0.5
3
ns
tsk(pp) (1)
Part-to-part skew
0
5
ns
tr
Output signal rise time
See Figure 1
2
tf
Output signal fall time
See Figure 1
2
ns
tfs
Failsafe output delay time from input power loss
See Figure 2
3
µs
100-Mbps NRZ data input,
See Figure 4
2
100-Mbps unrestricted bit run length
data input, See Figure 4
3
tjit(PP)
(1)
Peak-to-peak eye-pattern jitter
TEST CONDITIONS
MIN
UNIT
ns
ns
tsk(PP) is the magnitude of the difference in propagation delay times between any specified terminals of two devices when both devices
operate with the same supply voltages, at the same temperature, and have identical packages and test circuits.
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ELECTRICAL CHARACTERISTICS: VCC1 at 3.3-V, VCC2 at 5-V (1) OPERATION
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Quiescent
ICC1
VCC1 supply current
ICC2
VCC2 supply current
VOH
High-level output voltage
VOL
Low-level output voltage
VI(HYS)
Input voltage hysteresis
IIH
High-level input current
IN at 2 V
IIL
Low-level input current
IN at 0.8 V
CI
Input capacitance to ground
IN at VCC, VI = 0.4 sin (4E6πt)
CMTI
Common-mode transient immunity
VI = VCC or 0 V, See Figure 3
(1)
25 Mbps
Quiescent
25 Mbps
MIN
VI = VCC or 0 V, No load
VI = VCC or 0 V, No load
TYP
MAX
0.3
0.5
1
2
8
12
10
14
IOH = –4 mA, See Figure 1
VCC – 0.8
4.6
IOH = –20 µA, See Figure 1
VCC – 0.1
5
mA
mA
V
IOL = 4 mA, See Figure 1
0.2
0.4
IOL = 20 µA, See Figure 1
0
0.1
150
V
mV
10
µA
µA
–10
15
UNIT
1
pF
40
kV/µs
For 5-V operation, VCC1 or VCC2 is specified from 4.5 V to 5.5 V. For 3.3-V operation, VCC1 or VCC2 is specified from 3 V to 3.6 V.
SWITCHING CHARACTERISTICS: VCC1 at 3.3-V, VCC2 at 5-V OPERATION
over recommended operating conditions (unless otherwise noted)
TYP
MAX
tPLH
Propagation delay, low-to-high-level output
PARAMETER
See Figure 1
17
30
ns
tPHL
Propagation delay , high-to-low-level output
See Figure 1
17
30
ns
tsk(p)
Pulse skew |tPHL – tPLH|
See Figure 1
0.5
3
ns
tsk(pp) (1)
Part-to-part skew
0
5
ns
tr
Output signal rise time
See Figure 1
1
tf
Output signal fall time
See Figure 1
1
ns
tfs
Failsafe output delay time from input power loss
See Figure 2
3
µs
100-Mbps NRZ data input, See
Figure 4
2
100-Mbps unrestricted bit run length
data input, See Figure 4
3
tjit(PP)
(1)
6
Peak-to-peak eye-pattern jitter
TEST CONDITIONS
MIN
UNIT
ns
ns
tsk(PP) is the magnitude of the difference in propagation delay times between any specified terminals of two devices when both devices
operate with the same supply voltages, at the same temperature, and have identical packages and test circuits.
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ELECTRICAL CHARACTERISTICS: VCC1 and VCC2 at 3.3-V (1) OPERATION
over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Quiescent
ICC1
VCC1 supply current
ICC2
VCC2 supply current
VOH
High-level output voltage
VOL
Low-level output voltage
VI(HYS)
Input voltage hysteresis
IIH
High-level input current
IN at 2 V
IIL
Low-level input current
IN at 0.8 V
CI
Input capacitance to ground
IN at VCC, VI = 0.4 sin (4E6πt)
CMTI
Common-mode transient immunity
VI = VCC or 0 V, See Figure 3
(1)
25 Mbps
Quiescent
25 Mbps
MIN
VI = VCC or 0 V, No load
VI = VCC or 0 V, No load
TYP
MAX
0.3
0.5
1
2
4
6.5
5
7.5
IOH = –4 mA, See Figure 1
VCC – 0.4
3
IOH = –20 µA, See Figure 1
VCC – 0.1
3.3
mA
mA
V
IOL = 4 mA, See Figure 1
0.2
0.4
IOL = 20 µA, See Figure 1
0
0.1
150
V
mV
10
µA
µA
–10
15
UNIT
1
pF
40
kV/µs
For 5-V operation, VCC1 or VCC2 is specified from 4.5 V to 5.5 V. For 3.3-V operation, VCC1 or VCC2 is specified from 3 V to 3.6 V.
SWITCHING CHARACTERISTICS: VCC1 and VCC2 at 3.3-V OPERATION
over recommended operating conditions (unless otherwise noted)
TYP
MAX
tPLH
Propagation delay, low-to-high-level output
PARAMETER
See Figure 1
20
34
ns
tPHL
Propagation delay , high-to-low-level output
See Figure 1
20
34
ns
tsk(p)
Pulse skew |tPHL – tPLH|
See Figure 1
0.5
3
ns
tsk(pp) (1)
Part-to-part skew
0
5
ns
tr
Output signal rise time
See Figure 1
2
tf
Output signal fall time
See Figure 1
2
ns
tfs
Failsafe output delay time from input power loss
See Figure 2
3
µs
100-Mbps NRZ data input, See
Figure 4
2
100-Mbps unrestricted bit run length
data input, See Figure 4
3
tjit(PP)
(1)
Peak-to-peak eye-pattern jitter
TEST CONDITIONS
MIN
UNIT
ns
ns
tsk(PP) is the magnitude of the difference in propagation delay times between any specified terminals of two devices when both devices
operate with the same supply voltages, at the same temperature, and have identical packages and test circuits.
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ISOLATION BARRIER
PARAMETER MEASUREMENT INFORMATION
IN
Input
Generator
(see Note A)
VI
50 W
VCC1
VI
IO
OUT
VCC1/2
VCC1/2
0V
tPHL
VOH
tPLH
VO
CL
V
(see Note B) O
90%
50%
tr
A.
The input pulse is supplied by a generator having the following characteristics:
PRR ≤ 50 kHz, 50% duty cycle, tr ≤ 3 ns, tf ≤ 3 ns, ZO = 50 Ω.
B.
CL = 15 pF and includes instrumentation and fixture capacitance within ±20%.
50%
10%
VOL
tf
Figure 1. Switching Characteristic Test Circuit and Voltage Waveforms
VCC1
0V
IN
ISOLATION BARRIER
VI
VCC1
VI
OUT
2.7 V
VO
0V
tfs
CL
15 pF
±20%
VOH
50%
VO
VOL
NOTE: VI transition time is 100 ns
VCC1
IN
VCC
or
0V
CI = 0.1 mF,
GND1
ISOLATION BARRIER
Figure 2. Failsafe Delay Time Test Circuit and Voltage Waveforms
VCC2
OUT
GND2
±1%
CL
15 pF
±20%
VO
VCM
NOTE: Pass/fail criteria is no change in VO.
Figure 3. Common-Mode Transient Immunity Test Circuit and Voltage Waveform
8
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PARAMETER MEASUREMENT INFORMATION (continued)
Tektronix
HFS9009
Tektronix
784D
PATTERN
GENERATOR
VCC1
In p u t
0V
O u tp u t
VCC2/2
J itte r
NOTE: Bit pattern run length is 216 – 1. Transition Time is 800 ps. NRZ data input has no more than five consecutive
1s or 0s.
Figure 4. Peak-to-Peak Eye-Pattern Jitter Test Circuit and Voltage Waveform
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DEVICE INFORMATION
PACKAGE CHARACTERISTICS
PARAMETER
TEST CONDITIONS
(1)
MIN
TYP
MAX
UNIT
L(101)
Minimum air gap (clearance)
Shortest terminal-to-terminal distance through air
4.8
mm
L(102)
Shortest terminal to terminal distance across the
Minimum external tracking (creepage)
package surface
4.3
mm
CTI
Tracking resistance (comparative
tracking index)
DIN IEC 60112/VDE 0303 Part 1
≥ 175
V
Minimum internal gap
(internal clearance)
Distance through insulation
0.008
mm
RIO
Isolation resistance
Input to output, VIO = 500 V, all pins on each side of
the barrier tied together creating a two-terminal
device, TA < 100°C
>1012
Ω
Input to output, VIO = 500 V,
100°C ≤ TA< TA max.
>1011
Ω
CIO
Barrier capacitance, input to output
VI = 0.4 sin (4E6πt)
1
pF
CI
Input capacitance to ground
VI = 0.4 sin (4E6πt)
1
pF
(1)
Creepage and clearance requirements are 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 according to the measurement techniques shown in the Isolation
Glossary. Techniques such as inserting grooves and/or ribs on a printed circuit board are used to help increase these specifications.
IEC 60664-1 RATINGS TABLE
PARAMETER
TEST CONDITIONS
Basic isolation group
Installation classification
SPECIFICATION
Material group
IIIa
Rated mains voltage ≤150 VRMS
I-IV
Rated mains voltage ≤300 VRMS
I-III
DEVICE I/O SCHEMATIC
Equivalent Input and Output Schematic Diagrams
Input
Output
VCC2
VCC1
VCC1
VCC1
1 MW
8W
OUT
500 W
IN
13 W
10
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IEC SAFETY LIMITING VALUES
Safety limiting is designed to prevent potential damage to the isolation barrier upon failure of input or output
circuitry. A failure of the IO 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
IS
Safety input, output, or supply current
TS
Maximum case temperature
MIN
MAX
θJA = 263°C/W, VI = 5.5 V, TJ = 170°C, TA = 25°C
100
θJA = 263°C/W, VI = 3.6 V, TJ = 170°C, TA = 25°C
153
150
UNIT
mA
°C
The safety-limiting constraint is the absolute maximum junction temperature specified in the absolute maximum
ratings table. The power dissipation and junction-to-air thermal impedance of the device installed in the
application hardware determines the junction temperature. The junction-to-air thermal resistance in the Thermal
Characteristics table is that of a device installed in the JESD51-3, Low Effective Thermal Conductivity Test Board
for Leaded Surface Mount Packages and is conservative. 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.
THERMAL CHARACTERISTICS
(over recommended operating conditions unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
Low-K (1)
263
High-K (1)
125
MAX
UNIT
θJA
Junction-to-air thermal resistance
θJB
Junction-to-board thermal resistance
44
°C/W
θJC
Junction-to-case thermal resistance
75
°C/W
PD
Device power dissipation
(1)
VCC1 = VCC2 = 5.5 V, TJ = 150°C, CL = 15 pF,
Input a 100-Mbps 50% duty cycle square wave
°C/W
159
mW
Tested in accordance with the Low-K or High-K thermal metric definition of EIA/JESD51-3 for leaded surface-mount packages.
200
Safety Limiting Current − mA
175
VCC1, VCC2 = 3.6 V
150
125
100
75
VCC1, VCC2 = 5.5 V
50
25
0
0
50
100
150
200
o
Case Temperature − C
Figure 5. θJC Thermal Derating Curve Per IEC 60747-5-2
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FUNCTION TABLE (1)
VCC1
PU
PD
(1)
12
VCC2
PU
PU
INPUT
(IN)
OUTPUT
(OUT)
H
H
L
L
Open
H
X
H
PU = powered up (VCC ≥ 3 V), PD = powered down (VCC ≤ 2.5 V), X = irrelevant, H = high level,
L = low level
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TYPICAL CHARACTERISTICS
RMS SUPPLY CURRENT vs SIGNALING RATE
RMS SUPPLY CURRENT vs SIGNALING RATE
15
10
VCC1 = 3.3 V,
VCC2 = 3.3 V,
o
TA = 25 C,
CL = 15 pF
8
VCC1 = 5 V,
VCC2 = 5 V,
o
TA = 25 C,
CL = 15 pF
14
13
ICC − Supply Current − (mARMS)
ICC − Supply Current − (mARMS)
9
7
6
ICC2
5
4
3
ICC1
2
12
11
10
ICC2
9
8
7
ICC1
6
5
4
3
2
1
1
0
0
0
25
50
75
100
0
25
50
Signaling Rate (Mbps)
75
100
Signaling Rate (Mbps)
Figure 6.
Figure 7.
PROPAGATION DELAY vs FREE-AIR TEMPERATURE
PROPAGATION DELAY vs FREE-AIR TEMPERATURE
30
20
tPLH
18
tPLH
25
tPHL
16
20
15
10
VCC1 = 3.3 V,
VCC2 = 3.3 V,
CL = 15 pF,
Air Flow at 7 cf/m
5
0
-40
-25
-10
5
20
35
50
80
65
95
Propagation Delay − ns
Propagation Delay − ns
tPHL
14
12
10
8
6
VCC1 = 5 V,
VCC2 = 5 V,
CL = 15 pF,
Air Flow at 7 cf/m
4
2
0
-40
110 125
-25
-10
o
5
20
35
50
80
65
95
110 125
o
TA − Free-Air Temperature − C
TA − Free-Air Temperature − C
Figure 8.
Figure 9.
INPUT THRESHOLD VOLTAGE vs
FREE-AIR TEMPERATURE
VCC1 FAILSAFE THRESHOLD VOLTAGE vs
FREE-AIR TEMPERATURE
2.92
1.4
5-V (VIT+)
2.9
1.3
3.3-V (VIT+)
1.25
1.2
Air Flow at 7 cf/m
1.15
5-V (VIT- )
1.1
VCC1 Failsafe Voltage − V
VIT − Input Voltage Threshold − V
1.35
Vfs+
2.88
VCC = 5 V or 3.3 V,
CL = 15 pF,
Air Flow at 7 cf/m
2.86
2.84
2.82
Vfs-
2.8
1.05
3.3-V (VIT- )
1
-40
-25
-10
5
20
35
50
80
65
95
110 125
2.78
-40
-25
o
TA − Free-Air Temperature − C
-10
5
20
35
50
65
80
95
110 125
TA − Free-Air Temperature − oC
Figure 10.
Figure 11.
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ISO721-Q1
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TYPICAL CHARACTERISTICS (continued)
HIGH-LEVEL OUTPUT CURRENT vs HIGH-LEVEL OUTPUT
VOLTAGE
LOW-LEVEL OUTPUT CURRENT vs
LOW-LEVEL OUTPUT VOLTAGE
-80
70
TA = 25 C
-70
IOL − Low-Level Output Current − mA
IOH − High-Level Output Current − mA
o
TA = 25 C
o
VCC = 5 V
-60
-50
-40
VCC = 3.3 V
-30
-20
-10
0
60
VCC = 5 V
50
40
30
VCC = 3.3 V
20
10
0
0
1
2
3
5
4
6
0
VOH − High-Level Output Voltage − V
Figure 12.
14
1
2
3
4
5
VOL − Low-Level Output Voltage − V
Figure 13.
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APPLICATION INFORMATION
MANUFACTURER CROSS-REFERENCE DATA
The ISO721 isolator has the same functional pinout as most other vendors, and it is often a pin-for-pin drop-in
replacement. The notable differences in the product are propagation delay, signaling rate, power consumption,
and transient protection rating. Table 1 is used as a guide for replacing other isolators with the ISO721
single-channel isolators.
6 OUT
GND1 4
5 GND2
VI 2
VDD1 3
GND1 4
8 VDD2
VDD1 1
7 GND2
VI 2
6 VO
*
5 GND2
3
GND1 4
IL710
8 VDD2
7 NC
VDD1 1
VI 2
6 VO
5 GND2
NC 3
GND1 4
Isolation
IN 2
VCC1 3
VDD1 1
Isolation
8 VCC2
7 GND2
Isolation
VCC1 1
HCPL-xxxx
ADuM1100
Isolation
ISO721
8 VDD2
7 VOE
6 VO
5 GND2
Figure 14. Pinout Cross Reference
Table 1. Competitive Cross Reference
ISOLATOR
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
ISO721 (1) (2)
VCC1
IN
VCC1
GND1
GND2
OUT
GND2
VCC2
VDD1
VI
VDD1
GND1
GND2
VO
GND2
VDD2
GND1
GND2
VO
NC
VDD2
GND1
GND2
VO
VOE
VDD2
ADuM1100
(1)
(2)
(3)
(4)
(1) (2)
HCPL-xxxx
VDD1
VI
Leave
Open (3)
IL710
VDD1
VI
NC (4)
The ISO721 pin 1 and pin 3 are internally connected together. Either or both may be used as VCC1.
The ISO721 pin 5 and pin 7 are internally connected together. Either or both may be used as GND2.
Pin 3 of the HCPL devices must be left open. This is not a problem when substituting an ISO721, because the extra VCC1 on pin 3 may
be left open circuit as well.
Pin 3 of the IL710 must not be tied to ground on the circuit board, because this shorts the ISO721 VCC1 to ground. The IL710 pin 3 may
only be tied to VCC or left open to drop in an ISO721.
20 mm (max)
from VCC2
20 mm (max)
from VCC1
VCC1
VCC2
0.1 µF
Input
2
3
GND1
0.1 µF
ISO721
8
1
4
7
IN
OUT
6
5
Output
GND2
Figure 15. Basic Application Circuit
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ISOLATION GLOSSARY
Creepage Distance — The shortest path between two conductive input to output leads measured along the
surface of the insulation. The shortest distance path is found around the end of the package body.
Clearance — The shortest distance between two conductive input to output leads measured through air (line of
sight).
Input-to-Output Barrier Capacitance — The total capacitance between all input terminals connected together,
and all output terminals connected together.
Input-to-Output Barrier Resistance — The total resistance between all input terminals connected together, and
all output terminals connected together.
Primary Circuit — An internal circuit directly connected to an external supply mains or other equivalent source
which supplies the primary circuit electric power.
Secondary Circuit — A circuit with no direct connection to primary power, and derives its power from a separate
isolated source.
Comparative Tracking Index (CTI) — CTI is an index used for electrical insulating materials and is defined as
the numerical value of the voltage that causes failure by tracking during standard testing. Tracking is the process
that produces a partially conducting path of localized deterioration on or through the surface of an insulating
material as a result of the action of electric discharges on or close to an insulation surface -- the higher CTI value
of the insulating material, the smaller the minimum creepage distance.
Generally, insulation breakdown occurs either through the material, over its surface, or both. Surface failure may
arise from flashover or from the progressive degradation of the insulation surface by small localized sparks. Such
sparks are the result of the breaking of a surface film of conducting contaminant on the insulation. The resulting
break in the leakage current produces an overvoltage at the site of the discontinuity, and an electric spark is
generated. These sparks often cause carbonization on insulation material and lead to a carbon track between
points of different potential. This process is known as tracking.
16
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Insulation
Operational insulation — Insulation needed for the correct operation of the equipment
Basic insulation — Insulation to provide basic protection against electric shock
Supplementary insulation — Independent insulation applied in addition to basic insulation in order to ensure
protection against electric shock in the event of a failure of the basic insulation
Double insulation — Insulation comprising both basic and supplementary insulation
Reinforced insulation — A single insulation system that provides a degree of protection against electric shock
equivalent to double insulation
Pollution Degree
Pollution Degree 1 — No pollution, or only dry, nonconductive pollution occurs. The pollution has no influence.
Pollution Degree 2 — Normally, only nonconductive pollution occurs. However, a temporary conductivity caused
by condensation must be expected.
Pollution Degree 3 — Conductive pollution occurs or dry nonconductive pollution occurs that becomes
conductive due to condensation, which is to be expected.
Pollution Degree 4 – Continuous conductivity occurs due to conductive dust, rain, or other wet conditions.
Installation Category
Overvoltage Category — This section addresses insulation coordination by identifying the transient overvoltages
that may occur and by assigning four different levels as indicated in IEC 60664.
I: Signal Level — Special equipment or parts of equipment
II: Local Level — Portable equipment, etc.
III: Distribution Level — Fixed installation
IV: Primary Supply Level — Overhead lines, cable systems
Each category should be subject to smaller transients than the category above.
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