ACPL-K370, ACPL-K376
Isolated Voltage/Current Detector
Data Sheet
Description
Features
The ACPL-K370 and ACPL-K376 are voltage/current
threshold detection optocouplers. The ACPL-K376 is a lowcurrent version of the ACPL-K370. To obtain lower current
operation, the ACPL-K376 uses a high-efficiency AlGaAs
LED which has higher light output at lower drive currents.
Both devices have a threshold sensing input buffer IC
that allows threshold levels to be set by a single external
resistor over a wide range of input voltages.
x ± 5% voltage detection accuracy
The input buffer has several performance enhancing
features: hysteresis for extra noise immunity and
switching immunity, a diode bridge for easy use with AC
input signals, and internal clamping diodes to protect the
buffer and LED from over-voltage and over-current transients. Because threshold sensing is done prior to driving
the LED, variations in optical coupling from the LED to the
detector will not effect the threshold levels.
The ACPL-K370 input buffer IC has a nominal turn-on
threshold of 3.8 V(V TH+) and 2.77 mA (ITH+). The buffer
IC for the ACPL-K376 is designed for lower input current.
The nominal turn-on threshold for the ACPL-K376 is 3.8 V
(V TH+) and 1.32 mA (ITH+), which reduces power dissipation by 52%.
x Wide AC or DC detection range: up to 1140 Vpeak
x User configurable single/dual detection levels
x Built-in hysteresis improves noise immunity
x Very low threshold current: 1.32 mA (ACPL-K376)
x Logic compatible output
x Wide output supply voltage: 2 V to 18 V
x –40°C to +105°C operating temperature range
x SSO-8 package with 8 mm creepage and clearance
x Safety and regulatory approval:
– IEC/EN/DIN EN 60747-5-5: 1140 Vpeak working
insulation voltage
– UL 1577: 5000 Vrms/1minute double protection
rating
– CSA: Component Acceptance Notice #5
Applications
x Limit switch sensing
x Low voltage detector
The high-gain output stage features an open-collector
output for both TTL compatible saturation voltages and
CMOS compatible breakdown voltages.
x AC mains and DC-link voltage detection
By combining many unique functions in a single package, the
ACPL-K370 and ACPL-K376 are ideal components for industrial control computer input boards and other applications
where a predetermined input threshold level is needed.
x Current sensing
Functional Diagram
Connection Diagram
D1
x Telephone ring detection
D2
RX
7 NC
D3
x Microprocessor interfacing
8 VCC
DC+ 2
DC 3
x Relay coil voltage monitor
ISOLATION BARRIER
ICC
AC1 1
x Relay contact monitor
D4
AC2 4
Figure 1. Functional Diagram
IO
6 VO
5 GND
AC/DC
POWER
TRUTH TABLE
(POSITIVE LOGIC)
INPUT OUTPUT
H
L
L
H
CONTROLLER
GND1
Figure 2. Connection Diagram
ACPL-K370
ACPL-K376
GND2
Table 1. Ordering Information
The ACPL-K370 and ACPL-K376 are UL recognized with 5000 Vrms for 1 minute per UL1577.
Option
Part number
RoHS
Compliant
Package
Surface Mount
Quantity
X
-000E
-060E
ACPL-K370
ACPL-K376
IEC/EN/
DIN EN
60747-5-2
Tape
& Reel
Stretched
SO-8
-500E
-560E
80 per tube
X
X
X
X
X
X
80 per tube
1000 per reel
X
1000 per reel
To form a complete ordering part number, choose a part number from the part number column and combine it with the
desired option from the option column.
Example 1:
ACPL-K370-560E orders an RoHS compliant part with an IEC/EN/DIN EN 60747-5-5 certification and Tape & Reel
packaging.
Package Outline Drawings
Stretched SO-8 Package (SSO-8)
RECOMMENDED LAND PATTERN
5.850 ± 0.50
(0.230 ± 0.010)
PART NUMBER
8
7
6
5
K370
Z
YYWW
Z = OPTION CODE [1]
RoHS-COMPLIANCE
INDICATOR
DATE CODE
12.650 (0.5)
6.807 ± 0.127
(0.268 ± 0.005)
1.905 (0.1)
1
2
3
4
7°
3.180 ± 0.127
(0.125 ± 0.005)
0.381 ± 0.130
(0.015 ± 0.005)
0.750 ± 0.250
(0.0295 ± 0.010)
1.270
(0.050) BSG
Note 1. “V” = Options comprise 060; other options are not marked.
Figure 3.
2
0.450
(0.018)
45°
1.590 ± 0.127
(0.063 ± 0.005)
0.200 ± 0.100
(0.008 ± 0.004)
11.50 ± 0.250
(0.453 ± 0.010)
Dimensions in millimeters and (inches).
Lead coplanarity = 0.1 mm (0.004 inches).
Recommended Lead-Free IR Soldering Profile
The recommended reflow soldering profile is per JEDEC Standard J-STD-020 (latest revision). Non-halide flux should be
used.
Regulatory Information
The ACPL-K370/K376 is approved by the following organizations:
IEC/EN/DIN EN 60747-5-5 (with option 060)
UL
Approved with a maximum working insulation voltage of
VIORM = 1140 Vpeak, and with a highest allowable overvoltage of VIOTM = 8000 Vpeak.
Approval under the UL 1577 component recognition
program up to VISO = 5000 VRMS / 1 minute. File E55361.
CSA
Approval under CSA Component Acceptance Notice #5,
File CA 88324.
Table 2. Insulation Related Specifications
Parameter
Symbol
Value
Units
Conditions
Minimum External Air Gap
(Clearance)
L(IO1)
8
mm
L(IO1)
Minimum External Tracking Path
(Creepage)
L(IO2)
8
mm
Measured from input terminals to output terminals
0.08
mm
Through insulation distance conductor to conductor
175
V
DIN IEC 112/VDE 0303 Part 1
Minimum Internal Plastic Gap
(Clearance)
Tracking Resistance
Isolation Group
(per DIN VDE 0109)
3
CTI
IIIa
Material Group DIN VDE 0109
Table 3. IEC/EN/DIN EN 60747-5-5 Insulation Related Characteristics [1] (with option 060)
Description
Symbol
Characteristic
Installation Classification per DIN VDE 0110/1.89, Table 1:
for rated mains voltage ≤ 300 Vrms
for rated mains voltage ≤ 450 Vrms
for rated mains voltage ≤ 600 Vrms
for rated mains voltage ≤ 1000 Vrms
I-IV
I-III
I-III
I-II
Climatic Classification
55/105/21
Pollution Degree (DIN VDE 0110/1.89)
2
Units
Maximum Working Insulation Voltage
VIORM
1140
Vpeak
Input to Output Test Voltage, Method b
VIORM x 1.875 = VPR, 100% Production Test with tm = 1 second,
Partial Discharge < 5 pC
VPR
2137
Vpeak
Input to Output Test Voltage, Method a
VIORM x 1.6 = VPR, Type and sample test, tm = 10 seconds,
Partial Discharge < 5 pC
VPR
1824
Vpeak
Highest Allowable Overvoltage (Transient overvoltage, tini = 60 seconds)
VIOTM
8000
Vpeak
Safety Limiting Values (Maximum values allowed in the event of a failure)
Case Temperature
Input Current [2]
Output Power [2]
TS
IS,INPUT
PS,OUTPUT
175
230
600
°C
mA
mW
Insulation Resistance at TS, VIO = 500 V
RS
109
:
Notes:
1. Insulation characteristics are guaranteed only within the safety maximum ratings, which must be ensured by protective circuits within the
application.
2. Safety-limiting parameters are dependent on case temperature. The input current, IS,INPUT, should be derated linearly above 25°C free-air case
temperature at a rate of 1.53 mA / °C; the Output Power, PS,OUTPUT, should be derated linearly above 25°C free-air case temperature at a rate of
4 mW / °C.
4
Table 4. Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
Storage Temperature
TS
–55
125
°C
Operating Temperature
TA
–40
105
°C
Input Current, Average
IIN
50
mA
1
Input Current, Surge
IIN
140
mA
1, 2
Input Current, Transient
IIN
500
mA
1, 2
Input Voltage (Pins 2-3)
VIN
–0.5
Note
V
Input Power Dissipation
PIN
200
mW
3
Total Package Power Dissipation
PT
269
mW
4
Output Power Dissipation
PO
163
mW
5
Output Current, Average
IO
30
mA
6
Supply Voltage (Pins 8-5)
VCC
–0.5
20
V
Output Voltage (Pins 6-5)
VO
–0.5
20
V
Lead Solder Temperature
260°C for 10 seconds, measured at 1.6 mm below seating plane.
Notes:
1. Current into or out of any single lead.
2. Surge input current duration is 3 ms at a 120 Hz pulse repetition rate. Transient input current duration is 10 μs at a 120 Hz pulse repetition rate. Note
that the maximum input power, PIN, must be observed.
3. Derate linearly above 105°C free-air temperature at a rate of 10 mW / °C. The maximum input power dissipation of 200 mW allows an input IC
junction temperature of 125°C at an ambient temperature of TA = 105°C. Excessive PIN and TJ may result in IC chip degradation.
4. Derate linearly above 105°C free-air temperature at a rate of 13.5 mW / °C.
5. Derate linearly above 105°C free-air temperature at a rate of 8.2 mW / °C. A maximum output power dissipation of 163 mW allows an output IC
junction temperature of 125°C at an ambient temperature of TA = 105°C.
6. Derate linearly above 105°C free-air temperature at a rate of 1.5 mA / °C.
Table 5. Recommended Operating Conditions
Parameter
Symbol
Min
Max
Units
Note
Supply Voltage
VCC
2
18
V
Operating Temperature
TA
–40
105
°C
Operating Frequency, VCC = 5 V
f
0
9
kHz
1
Operating Frequency, VCC = 3.3 V
f
0
5
kHz
1
Notes:
1. Maximum operating frequency is defined when the output waveform at pin 6 obtains only 90% of VCC with RL = 4.7 k:, CL = 30 pF using a 5 V
square wave input signal.
5
Table 6. Electrical Specifications
Unless otherwise noted, TA = –40°C to +105°C and VCC = 3 V to 5.5 V.
Min
Typ[1]
Max
Units Test Conditions/Notes
Fig.
V TH+
3.6
(–5%)
3.35
3.8
4
(+5%)
4.05
V
5, 6
Lower Threshold
Voltage, DC Input
(Pins 2, 3)
V TH–
2.45
(–5%)
2.01
2.59
2.72
(+5%)
2.96
V
Upper Threshold
Voltage, AC Input
(Pins 1, 4)
V TH+
4.7
(–6%)
4.23
5
5.3
(+6%)
5.5
V
Lower Threshold
Voltage, AC Input
(Pins 1, 4)
V TH–
3.57
(–6%)
2.87
3.8
4.03
(+6%)
4.42
V
Upper Threshold
Current
ITH+
ACPL-K370 2.26
Upper Threshold
Current
ITH+
ACPL-K376 1.03
Lower Threshold
Current
ITH–
ACPL-K370 1.09
Lower Threshold
Current
ITH–
ACPL-K376 0.48
Current Hysteresis
IHYS
ACPL-K370
Voltage Hysteresis
VHYS
Input Clamp Voltage
VIHC1
5.4
6.1
VIHC2
6.1
Parameter
Sym.
Upper Threshold
Voltage, DC Input
(Pins 2, 3)
Device
2.77
1.96
1.32
0.87
1.44
1
0.68
0.43
V
V
TA = 25°C, VIN = VDC+ – VDC–;
AC1 and AC2 open
VIN = VDC+ – VDC–; AC1 and AC2 open
TA = 25°C, VIN = VAC1 – VAC2,
DC+ and DC– open; Note 2
VIN = VAC1 – VAC2, DC+ and DC– open
5, 6
5, 6
5, 6
5, 6
5, 6
V
TA = 25°C, VIN = VAC1 – VAC2,
DC+ and DC– open
VIN = VAC1 – VAC2, DC+ and DC– open
5, 6
2.99
mA
TA = 25°C
5, 6
3.11
mA
1.46
mA
1.56
mA
1.59
mA
1.62
mA
0.77
mA
0.8
mA
1.2
ACPL-K376
V
TA = 25°C, VIN = VDC+ – VDC–;
AC1 and AC2 open
VIN = VDC+ – VDC–; AC1 and AC2 open
mA
5, 6
5, 6
TA = 25°C
5, 6
5, 6
TA = 25°C
5, 6
5, 6
TA = 25°C
5, 6
5, 6
IHYS = ITH+ – ITH–
5
0.6
mA
1.2
V
VHYS = V TH+ – V TH–
5
6.8
V
4
6.8
7.4
V
VIHC3
12.5
13.4
V
VILC
–0.76
V
VIHC1 = VDC+ – VDC–, IIN = 10 mA,
AC1 & AC2 connected to DC–
VIHC2 = |VAC1 – VAC2|, |IIN| = 10 mA,
DC+ and DC– open
VIHC3 = VDC+ – VDC–, IIN = 15 mA,
AC1 & AC2 open
VILC = VDC+ – VDC–, IIN = –10 mA
4
4
Input Current
IIN
ACPL-K370 3.2
3.9
4.4
mA
VDC+ – VDC– = 5 V, AC1 and AC2 open
8
Input Current
IIN
ACPL-K376 1.5
1.9
2.2
mA
VDC+ – VDC– = 5 V, AC1 and AC2 open
8
Bridge Diode
Forward Voltage
VD1,2
ACPL-K370
0.59
V
IIN = 3 mA
ACPL-K376
0.47
V
IIN = 1.5 mA
ACPL-K370
0.78
V
IIN = 3 mA
VD3,4
V
IIN = 1.5 mA
0.4
V
VCC = 4.5 V, IOL = 4.2 mA; Note 3
100
PA
VOH = VCC = 18 V; Note 4
0.9
0.5
4
3
mA
mA
VDC+ – VDC– = 5 V, VO open
9
ICCH
0.002
4
PA
VCC = 18 V, VO open
7
CIN
50
pF
f = 1 MHz, VIN = 0 V
ACPL-K376
Logic Low Output
Voltage
Logic High Output
Current
Logic Low Supply
Current
Logic High Supply
Current
Input Capacitance
0.73
0.05
VOL
IOH
ICCL
ACPL-K370
ACPL-K376
8
Notes:
1. All typical values are at TA = 25°C unless otherwise stated.
2. AC voltage is instantaneous voltage.
3. A logic “Low” output level at pin 6 occurs under the conditions of VIN ≥ V TH+ as well as the range of VIN > V TH– once VIN has exceeded V TH+.
4. A logic “High” output level at pin 6 occurs under the conditions of VIN ≤ VTH– as well as the range of VIN < VTH+ once VIN has decreased below VTH–.
6
Table 7. Switching Specifications
Unless otherwise noted, TA = –40°C to +105°C.
Parameter
Typ[1]
Max
Units
Test Conditions/Notes
Fig.
ACPL-K370
3.7
7.5
Ps
RL = 4.7 k:, CL = 30 pF; Note 2
10
ACPL-K376
6.2
12.5
Ps
ACPL-K370
3.7
7.5
Ps
ACPL-K376
6.3
12.5
Ps
ACPL-K370
13.8
70
Ps
ACPL-K376
13.3
70
Ps
ACPL-K370
8.5
45
Ps
ACPL-K376
6.4
45
Ps
25
Sym
Device
tPHL
Min
VCC = 4.5 V
Propagation Delay
Time to Logic Low
at Output
Propagation Delay
Time to Logic High
at Output
tPLH
Ps
Output Rise Time
(10-90%)
tR
ACPL-K370
ACPL-K376
24
Ps
Output Fall Time
(90-10%)
tF
ACPL-K370
0.3
Ps
ACPL-K376
0.4
Ps
ACPL-K370
4
7.5
Ps
ACPL-K376
6.8
12.5
Ps
ACPL-K370
4
7.5
Ps
RL = 1.8 k:, CL = 15 pF; Note 2
RL = 4.7 k:, CL = 30 pF; Note 3
10
RL = 1.8 k:, CL = 15 pF; Note 3
RL = 4.7 k:, CL = 30 pF
11
RL = 4.7 k:, CL = 30 pF
11
VCC = 3.3 V
Propagation Delay
Time to Logic Low
at Output
Propagation Delay
Time to Logic High
at Output
tPHL
tPLH
Output Rise Time
(10-90%)
tR
Output Fall Time
(90-10%)
tF
ACPL-K376
6.9
12.5
Ps
ACPL-K370
19
90
Ps
ACPL-K376
18.5
90
Ps
ACPL-K370
12.8
70
Ps
70
RL = 4.7 k:, CL = 30 pF; Note 2
RL = 1.8 k:, CL = 15 pF; Note 2
RL = 4.7 k:, CL = 30 pF; Note 3
RL = 1.8 k:, CL = 15 pF; Note 3
Ps
ACPL-K376
12.5
ACPL-K370
27
Ps
ACPL-K376
26
Ps
ACPL-K370
0.3
Ps
ACPL-K376
0.5
Ps
10
kV/Ps
IIN = 0 mA, RL = 4.7 k:, VO,MIN = 2 V,
VCM = 1500 V; Notes 4, 5
ACPL-K370
1
kV/Ps
IIN = 3.11 mA, RL = 4.7 k:, VO,MAX =
0.8 V, VCM = 500 V; Notes 4, 5
ACPL-K376
1
kV/Ps
IIN = 1.56 mA, RL = 4.7 k:, VO,MAX =
0.8 V, VCM = 500 V; Notes 4, 5
RL = 4.7 k:, CL = 30 pF
RL = 4.7 k:, CL= 30 pF
VCC = 3 V to 5.5 V
Common Mode
Transient Immunity
at Logic High Output
|CMH|
Common Mode
Transient Immunity
at Logic Low Output
|CML|
Notes:
1. All typical values are at TA = 25°C unless otherwise stated.
2. The tPHL propagation delay is measured from the 2.5 V level of the leading edge of a 5.0 V input pulse (1 Ps rise time) to the 1.5 V level on the leading
edge of the output pulse. CL includes probe and stray wiring capacitance.
3. The tPLH propagation delay is measured from the 2.5 V level of the trailing edge of a 5.0 V input pulse (1 Ps fall time) to the 1.5 V level on the trailing
edge of the output pulse. CL includes probe and stray wiring capacitance.
4. Common mode transient immunity with a logic “High” level is the maximum tolerable (positive) dVCM/dt on the leading edge of the common
mode pulse, VCM, to insure that the output will remain in a logic “High” state (i.e., VO > 2.0 V). Common mode transient immunity in logic “Low” level
is the maximum tolerable (negative) dVCM/dt on the trailing edge of the common mode pulse signal, VCM, to insure that the output will remain in
a logic “Low” state (i.e., VO < 0.8 V).
5. In applications where dVCM/dt may exceed 50 kV / μs (such as when a static discharge occurs), a series resistor, RCC, should be included to protect
the detector IC from destructive high surge currents. The recommended value for RCC is 240 : per volt of allowable drop in VCC (between pin 8 and
VCC) with a minimum value of 240 :.
7
Table 8. Package Characteristics
Over recommended temperature range of TA = –40°C to 105°C unless otherwise specified.
Parameter
Symbol
Min
Input-Output Momentary
Withstand Voltage
VISO
5000
Input-Output Resistance
RI-O
Input-Output Capacitance
CI-O
Typ
Max
Units
Test Conditions
Vrms
RH ≤ 50%, t = 1 min; TA = 25°C;
Notes 1 to 3
1012
:
VI-O = 500 Vdc; Note 2
0.6
pF
f = 1 MHz, VI-O = 0 Vdc; Note 2
Notes:
1. The input-output momentary withstand voltage is a dielectric voltage rating that should not be interpreted as an input-output continuous voltage
rating. For the continuous voltage rating refer to the IEC/EN/DIN EN 60747-5-5 Insulation Characteristics Table (if applicable), your equipment level
safety specification, or Avago Application Note 1074, Optocoupler Input-Output Endurance Voltage.
2. Device considered a two terminal device: pins 1, 2, 3, 4 connected together, and pins 5, 6, 7, 8 connected together.
3. In accordance with UL 1577, each optocoupler is proof tested by applying an insulation test voltage ≥ 6000 Vrms for 1 second (leakage detection
current limit, II-O ≤ 5 PA).
8
Typical Performance Plots
IIN - INPUT CURRENT - mA
Unless otherwise noted, TA = 25°C.
50
45
40
35
30
25
20
15
10
5
0
AC INPUT, PINS
2, 3 OPEN
DC INPUT, SHORT
PINS 1 & 2, SHORT
PINS 3 & 4.
DC INPUT, PINS
1, 4 OPEN
0
1
2
3
4
5 6 7 8 9 10 11 12 13 14
VIN - INPUT VOLTAGE - V
Figure 4. Typical input characteristics IIN vs. VIN
(AC voltage is an instantaneous value).
6
VCC = 5 V
RL = 4.7 kΩ
VO - OUTPUT VOLTAGE - V
5
4
3
Input
Signal
Device
2
ITH
ACPL-K370
2.77mA 1.44mA
ACPL-K376
1.32mA 0.68mA
1
0
THINPUT SIGNAL
(a)
TH+
TH–
Input
Connection
PINS 2, 3
OR 1, 4
VTH(DC)
ALL
3.8V
2.59V
PINS 2, 3
VTH(AC)
ALL
5V
3.8V
PINS 1, 4
TH+
(b)
VTH+
ITH+
VTH–
ITH–
-40
-20
0
20 40 60
TA - TEMPERATURE - °C
80
3.3
3.1
2.9
2.7
2.5
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
100 120
4.2
4
3.8
3.6
3.4
3.2
3
2.8
2.6
2.4
2.2
2
1.8
-60
Figure 6. Typical DC threshold levels vs. temperature for (a) ACPL-K370, and (b) ACPL-K376.
9
ACPL-K376
VTH+
ITH+
ITH–
-40
-20
VTH–
0 20 40 60
TA - TEMPERATURE - °C
80
1.6
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
100 120
ITH - THRESHOLD CURRENT -mA
ACPL-K370
VTH - THRESHOLD VOLTAGE - V
4.2
4
3.8
3.6
3.4
3.2
3
2.8
2.6
2.4
2.2
2
1.8
-60
ITH - THRESHOLD CURRENT -mA
VTH - THRESHOLD VOLTAGE - V
Figure 5. (a) Typical transfer characteristics, and (b) Input threshold levels.
ICCH - HIGH LEVEL SUPPLY CURRENT - PA
1E+0
1E-1
1E-2
1E-3
1E-4
1E-5
-60
-40
-20
0
20
40
60
TA - TEMPERATURE - °C
80
100
120
IIN
VDC+ – VDC– = 5V,
AC1 AND AC2 OPEN
-40
-20
0
20 40 60
TA - TEMPERATURE - °C
(a)
110
100
90
80
70
60
50
40
VOL
VCC = 4.5V, 30
IOL = 4.2mA 20
10
80 100 120
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
-60
ACPL-K376
-40
-20
110
100
90
80
70
60
50
VOL
40
VCC = 4.5V,
30
IOL = 4.2mA
20
10
0 20 40 60 80 100 120
TA - TEMPERATURE - °C
(b)
VOL - LOW OUTPUT VOLTAGE - mV
ACPL-K370
IIN - INPUT CURRENT - mA
4.4
4.2
4
3.8
3.6
3.4
3.2
3
2.8
2.6
2.4
-60
VOL - LOW OUTPUT VOLTAGE - mV
IIN - INPUT CURRENT - mA
Figure 7. Typical high level supply current, ICCH vs. temperature.
ACPL-K370
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
ICCL - LOGIC LOW SUPPLY CURRENT - mA
ICCL - LOGIC LOW SUPPLY CURRENT - mA
Figure 8. Typical input current, IIN, and low level output voltage, VOL vs. temperature for (a) ACPL-K370 and (b) ACPL-K376.
0
2
4
6
8
10
12
VCC - SUPPLY VOLTAGE - V
(a)
14
16
18
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
ACPL-K376
0
Figure 9. Typical logic low supply current vs. supply voltage for (a) ACPL-K370 and (b) ACPL-K376.
10
2
4
6
8
10
12
VCC - SUPPLY VOLTAGE - V
(b)
14
16
18
ACPL-K370
RL = 4.7k:,
CL = 30pF,
VCC = 4.5V
35
30
25
tPLH
20
15
10
tPHL
5
0
-60
-40
-20
ACPL-K376
40
tP - PROPAGATION DELAY - Ps
tP - PROPAGATION DELAY - Ps
40
0
20
40
60
TA - TEMPERATURE - °C
(a)
80
100
RL = 4.7k:,
CL = 30pF,
VCC = 4.5V
35
30
20
15
10
tPHL
5
0
-60
120
tPLH
25
-40
-20
0
20
40
60
TA - TEMPERATURE - °C
(b)
80
100
120
Figure 10. Typical propagation delay vs. temperature for (a) ACPL-K370 and (b) ACPL-K376.
60
tR
50
40
70
700
60
600
500
tF
30
800
400
20
300
10
200
0
-60
-40
-20
0
20 40 60
TA - TEMPERATURE - °C
(a)
80
tR - RISE TIME - Ps
tR - RISE TIME - Ps
70
tF - Fall Time - ns
RL = 4.7k:,
CL = 30pF,
VCC = 4.5V
ACPL-K376
80
900
900
800
tR
50
40
700
600
tF
30
500
20
400
10
300
0
-60
100
100 120
1000
RL = 4.7k:,
CL = 30pF,
VCC = 4.5V
-40
-20
0 20 40 60
TA - TEMPERATURE - °C
(b)
80
tF - Fall Time - ns
ACPL-K370
80
200
100 120
ACPL-K370
300
V+(AC)
250
V–(AC)
V+(DC)
200
V–(DC)
150
DC: VTH+ = 3.8V, VTH– = 2.59V;
AC: VTH+ = 5V, VTH– = 3.8V;
ITH+ = 2.77mA, ITH– = 1.44mA
(AC VOLTAGE IS
INSTANTANEOUS VALUE)
100
50
0
0
40
80
120
160
200
RX - EXTERNAL SERIES RESISTOR - k:
(a)
240
V± - EXTERNAL THRESHOLD VOLTAGE - V
V± - EXTERNAL THRESHOLD VOLTAGE - V
Figure 11. Typical rise, fall times vs. temperature for (a) ACPL-K370,and (b) ACPL-K376.
ACPL-K376
300
V+(AC)
250
V+(DC)
200
V–(DC)
150
DC: VTH+ = 3.8V, VTH– = 2.59V;
AC: VTH+ = 5V, VTH– = 3.8V;
ITH+ = 1.32mA, ITH– = 0.68mA
(AC VOLTAGE IS
INSTANTANEOUS VALUE)
100
50
0
0
Figure 12. Typical external threshold characteristics, V± vs. RX for (a) ACPL-K370 and (b) ACPL-K376.
11
V–(AC)
100
200
300
400
RX - EXTERNAL SERIES RESISTOR - k:
(b)
500
Electrical Considerations
The ACPL-K370/K376 optocouplers have internally temperature compensated, predictable voltage and current
threshold points. This allows a single external resistor, RX,
to determine larger external threshold voltage levels. For
a desired external threshold voltage, V±, the approximate
Rx value is shown in Figure 12. Equation 1 can be used to
calculate Rx.
Either AC (pins 1 and 4) or DC (pins 2 and 3) input can be
used to determine external threshold levels. For single
specifically selected external threshold voltage level V+ or
V–, RX can be determined without use of RP via:
V+ and V– voltage threshold levels can be simultaneously
set with two resistors, RX and RP, as shown in Figure 13 and
determined by Equations 4 and 5.
For dual specifically selected external threshold voltage
levels, V+ and V–, the use of RX and RP will permit this
selection. Two equations can be written:
RX can provide over-current transient protection by
limiting input current during a transient condition. For
monitoring contacts of a relay or switch, the ACPL-K370/
K376 in combination with RX and RP can be used to allow a
specific current to be conducted through the contacts for
cleaning purposes (wetting current).
The choice of which input voltage clamp level to choose
depends upon the application of this device (see Figure 4).
It is recommended that the low clamp condition be used
when possible. The low clamp condition in conjunction
with the low input current feature will ensure extremely
low input power dissipation.
In applications where dVCM/dt may be extremely large
(such as with a static discharge), a series resistor, RCC,
should be connected in series with VCC and pin 8 to protect
the detector IC from destructive high surge currents. The
recommended value for RCC is 240 : per volt of allowable
drop in VCC (between Pin 8 and VCC) with a minimum value
of 240 :. In addition, it is recommended that a ceramic
disc bypass capacitor of 0.01 PF be placed between pins 5
and 8 to reduce the effect of power supply noise.
For interfacing ac signals to TTL systems, output low pass
filtering can be performed with a pull-up resistor of 1.5 k:
and 20 PF capacitor. This application requires a Schmitt
trigger gate to avoid slow rise time chatter problems.
For AC input applications, a filter capacitor can be placed
across the DC input terminals for either signal or transient
filtering.
ITH±
V±
VTH±
RP
1 AC1
VCC 8
2 DC+
NC 7
3 DC–
VO 6
4 AC2
GND 5
VCC
RL
CL
GND
Figure 13. External threshold voltage level selection.
12
V+(–) – V TH+(–)
Equation 1
ITH+(–)
V+ = Rx ( ITH+ +
V– = Rx ( ITH– +
V TH+
RP
V TH–
RP
) + V TH+
Equation 2
) + V TH–
Equation 3
Solving these equations for RX and RP yields the following
two expressions:
RX =
V TH– (V+) – V TH+ (V–)
ITH+ (V TH–) – ITH– (V TH+)
V TH– (V+) – V TH+ (V–)
RP =
ITH+ (V– – V TH–) + ITH– (V TH+ – V+)
Equation 4
Equation 5
where
V+ and V– are the desired external voltage threshold
levels, and values for V TH± and ITH± are found from the
data sheet.
Equations 4 and 5 are valid only if the conditions of
Equations 6 or 7 are met. With the V TH± and ITH± values,
the denominator of Equation 4 is checked to see if it is
positive or negative. If it is positive, then the following
ratios must be met:
V+
≥
V–
V TH+
and
V TH–
V+ – V TH+
<
V– – V TH–
ITH+
Equation 6
ITH–
Conversely, if the denominator of Equation 4 is negative,
then the following ratios must hold:
ISOLATION
BARRIER
RX
RX =
V+
V–
VO
≤
V TH+
V TH–
and
V+ – V TH+
V– – V TH–
>
ITH+
ITH–
Equation 7
Refer to Application Note 1004 for more application information and worked out examples.
For product information and a complete list of distributors, please go to our web site:
www.avagotech.com
Avago, Avago Technologies, the A logo and R2Coupler™ are trademarks of Avago Technologies in the United States and other countries.
Data subject to change. Copyright © 2005-2011 Avago Technologies. All rights reserved.
AV02-2153EN - January 19, 2011
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