LVTTL/LVCMOS COMPATIBLE LOW INPUT
CURRENT HIGH GAIN SPLIT DARLINGTON
OPTOCOUPLERS
SINGLE CHANNEL:
DUAL CHANNEL:
DESCRIPTION
The FOD070L, FOD270L and FOD073L optocouplers consist of an AlGaAs
LED optically coupled to a high gain split darlington photodetector. These
devices are specified to operate at a 3.3V supply voltage.
The split darlington configuration separating the input photodiode and the first
stage gain from the output transistor permits lower output saturation voltage
and higher speed operation than possible with conventional darlington
phototransistor optocoupler. In the dual channel device FOD073L, an inte-
grated emitter – base resistor provides superior stability over temperature.
The combination of a very low input current of 0.5 mA and a high current
transfer ratio of 2000% makes this family particularly useful for input interface
to MOS, CMOS, LSTTL and EIA RS232C, while output compatibility is
ensured to LVCMOS as well as high fan-out LVTTL requirements.
An internal noise shield provides exceptional common mode rejection of
10 kV/µs.
8
1
8
1
FOD070L
FOD073L
FOD270L
8
1
FEATURES
• Low power consumption
• Low input current - 0.5 mA
• Available in single channel 8-pin DIP (FOD270L), 8-pin SOIC (FOD070L)
and dual channel 8-pin SOIC
• High CTR-2000%
• High CMR-10 kV/µs
• Guaranteed performance over temperature 0°C to 70°C
• U.L. recognized (File # E90700)
• LVTTL/LVCMOS Compatible output
N/C 1
8 V
CC
+ 1
V
+ 2
V
F
_
3
6 V
O
_
V
N/C 4
5 GND
3
6 V
02
7 V
B
F1
8 V
CC
_ 2
7 V
01
F2
+ 4
5 GND
FOD070L / FOD270L
FOD073L
APPLICATIONS
•
•
•
•
•
•
Digital logic ground isolation – LVTTL/LVCMOS
Telephone ring detector
EIA-RS-232C line receiver
High common mode noise line receiver
µP bus isolation
Current loop receiver
TRUTH TABLE
LED
ON
OFF
V
O
LOW
HIGH
© 2004 Fairchild Semiconductor Corporation
Page 1 of 17
8/10/04
LVTTL/LVCMOS COMPATIBLE LOW INPUT
CURRENT HIGH GAIN SPLIT DARLINGTON
OPTOCOUPLERS
SINGLE CHANNEL:
DUAL CHANNEL:
FOD070L
FOD073L
FOD270L
ABSOLUTE MAXIMUM RATINGS
(No derating required up to 85°C)
Parameter
Storage Temperature
Operating Temperature
Lead Solder Temperature (Wave solder only. See reflow profile for surface
mount devices)
EMITTER
DC/Average Forward Input Current
Peak Forward Input Current (50% duty cycle, 1 ms P.W.)
Peak Transient Input Current - (
≤
1 µs P.W., 300 pps)
Reverse Input Voltage
Input Power Dissipation
DETECTOR
Average Output Current
Emitter-Base Reverse Voltage (FOD070L, FOD270L)
Supply Voltage, Output Voltage
Output power dissipation
Each Channel
Each Channel
Each Channel
Each Channel
I
O
(avg)
V
EB
V
CC
, V
O
P
D
60
0.5
-0.5 to 7
100
mA
V
V
mW
Each Channel
Each Channel
Each Channel
Each Channel
Each Channel
I
F
(avg)
I
F
(pk)
I
F
(trans)
V
R
P
D
20
40
1.0
5
35
mA
mA
A
V
mW
Symbol
T
STG
T
OPR
T
SOL
Value
-40 to +125
-40 to +85
260 for 10 sec
Units
°C
°C
°C
ELECTRICAL CHARACTERISTICS
(T
A
= 0 to 70°C Unless otherwise specified)
INDIVIDUAL COMPONENT CHARACTERISTICS
Parameter
EMITTER
Input Forward Voltage
Input Reverse Breakdown
Voltage
DETECTOR
Logic high output current
Test Conditions
T
A
=25°C
Each Channel (I
F
= 1.6 mA)
(T
A
=25°C, I
R
= 10 µA)
Each Channel
(I
F
= 0 mA, V
O
= V
CC
= 3.3 V)
Each Channel
Logic Low Supply
Current
I
F
= 1.6 mA, V
O
= Open, V
CC
= 3.3V
I
F1
= I
F2
= 1.6mA
V
O1
= V
O2
= Open, V
CC
= 3.3 V
I
F
= 0 mA, V
O
= Open, V
CC
= 3.3V
I
F1
= I
F2
= 0mA
V
O1
= V
O2
= Open, V
CC
= 3.3 V
I
CCH
I
CCL
Symbol
V
F
BV
R
Device
All
All
FOD070L
FOD270L
FOD073L
FOD070L
FOD270L
FOD073L
FOD070L
FOD270L
FOD073L
0.5
0.8
0.01
0.01
1.5
mA
3
1
µA
2
5.0
Min
Typ**
1.35
Max
1.7
1.75
Unit
V
V
I
OH
0.05
25
µA
Logic High Supply
Current
**All typicals at T
A
= 25°C
© 2004 Fairchild Semiconductor Corporation
Page 2 of 17
8/10/04
LVTTL/LVCMOS COMPATIBLE LOW INPUT
CURRENT HIGH GAIN SPLIT DARLINGTON
OPTOCOUPLERS
SINGLE CHANNEL:
DUAL CHANNEL:
FOD070L
FOD073L
FOD270L
TRANSFER CHARACTERISTICS
(T
A
= 0 to 70°C Unless otherwise specified)
Parameter
COUPLED
Current transfer ratio
(Notes 1,2)
Logic low output voltage
output voltage
(Note 2)
**All typicals at T
A
= 25°C
Test Conditions Symbol
(I
F
= 0.5 mA, V
O
= 0.4 V, V
CC
= 3.3V)
(I
F
= 1.6 mA, I
O
= 8 mA, V
CC
= 3.3V)
(I
F
= 5 mA, I
O
= 15 mA, V
CC
= 3.3V)
V
OL
CTR
Device
ALL
ALL
ALL
Min
400
0.07
0.07
Typ**
Max
7000
0.3
0.4
V
Unit
%
SWITCHING CHARACTERISTICS
(T
A
= 0 to 70°C unless otherwise specified., V
CC
= 3.3 V)
Parameter
Propagation delay
time to logic low
Propagation delay
time to logic high
Common mode transient
immunity at logic high
Common mode transient
immunity at logic low
** All typicals at TA = 25°C
Test Conditions
(R
L
= 4.7 k
Ω
, I
F
= 0.5 mA)
(Note 2) (Fig. 17)
(R
L
= 4.7 k
Ω
, I
F
= 0.5 mA)
(Note 2) (Fig. 17)
(I
F
= 0 mA, |V
CM
| = 10 V
P-P
)
T
A
= 25°C (R
L
= 2.2 k
Ω
) (Note 3) (Fig. 18)
(I
F
= 1.6 mA, |V
CM
| = 10 V
P-P
,
R
L
= 2.2 k
Ω
)
T
A
= 25°C (Note 3) (Fig. 18)
Symbol
T
PHL
Device
FOD070L
FOD270L
FOD073L
T
PLH
FOD070L
FOD270L
FOD073L
|CM
H
|
|CM
L
|
ALL
1,000
Min
Typ**
3
5
50
25
10,000
V/µs
90
µs
Max
30
Unit
µs
ALL
1,000
10,000
V/µs
© 2004 Fairchild Semiconductor Corporation
Page 3 of 17
8/10/04
LVTTL/LVCMOS COMPATIBLE LOW INPUT
CURRENT HIGH GAIN SPLIT DARLINGTON
OPTOCOUPLERS
SINGLE CHANNEL:
DUAL CHANNEL:
FOD070L
FOD073L
FOD270L
ISOLATION CHARACTERISTICS
(T
A
= 0 to 70°C Unless otherwise specified)
Characteristics
Input-output
insulation leakage current
Test Conditions Symbol
(Relative humidity = 45%)
(T
A
= 25°C, t = 5 s)
(V
I-O
= 3000 VDC)
(Note 4)
(R
H
≤
50%, T
A
= 25°C)
(Note 4) ( t = 1 min.)
(Note 4) (V
I-O
= 500 VDC)
(Note 4,5) (f = 1 MHz)
(RH
≤
45%, V
I-I
= 500 VDC (Note 6)
(V
I-I
= 500 VDC) (Note 6)
(f = 1 MHz) (Note 6)
Device
Min
Typ**
Max
Unit
I
I-O
ALL
1.0
µA
Withstand insulation
test voltage
Resistance (input to output)
Capacitance (input to output)
Input-Input
Insulation leakage current
Input-Input Resistance
Input-Input Capacitance
** All typicals at T
A
= 25°C
V
ISO
R
I-O
C
I-O
I
I-I
R
I-I
C
I-I
FOD070L
FOD073L
FOD270L
ALL
ALL
FOD073L
FOD073L
FOD073L
2500
5000
10
12
0.7
0.005
10
11
0.03
V
RMS
Ω
pF
µA
Ω
pF
NOTES
1. Current Transfer Ratio is defined as a ratio of output collector current, I
O
, to the forward LED input current, I
F
, times 100%.
2. Pin 7 open. (FOD070L and FOD270L only)
3. Common mode transient immunity in logic high level is the maximum tolerable (positive) dV
CM
/dt on the leading edge of the
common mode pulse signal, V
CM
, to assure that the output will remain in a logic high state (i.e., V
O
>2.0 V). Common mode
transient immunity in logic low level is the maximum tolerable (negative) dV
CM
/dt on the trailing edge of the common mode
pulse signal, V
CM
, to assure that the output will remain in a logic low state (i.e., V
O
<0.8 V).
4. Device is considered a two terminal device: Pins 1, 2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are shorted together.
5. For dual channel devices, CI-O is measured by shorting pins 1 and 2 or pins 3 and 4 together and pins 5 through 8 shorted
together.
6. Measured between pins 1 and 2 shorted together, and pins 3 and 4 shorted together.
© 2004 Fairchild Semiconductor Corporation
Page 4 of 17
8/10/04
LVTTL/LVCMOS COMPATIBLE LOW INPUT
CURRENT HIGH GAIN SPLIT DARLINGTON
OPTOCOUPLERS
SINGLE CHANNEL:
DUAL CHANNEL:
TYPICAL PERFORMANCE CURVES
Fig. 1 Input Forward Current vs Forward Voltage
100
4500
FOD070L
FOD073L
FOD270L
Fig. 2 Current Transfer Ratio vs. Input Forward Current
(FOD270L only)
CTR - CURRENT TRANSFER RATIO (%)
V
O
= 0.4V
V
CC
= 3.3V
T
A
= 25°C
4000
3500
3000
2500
2000
1500
T
A
= 85°C
T
A
= 70°C
T
A
= 25°C
I
F
- FORWARD CURRENT (mA)
10
T
A
= 85°C
T
A
= 70°C
T
A
= -40°C
1
T
A
= 25°C
T
A
= 0°C
T
A
= 0°C
0.1
T
A
= -40°C
0.01
1000
500
0
0.1
0.001
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1
10
V
F
- FORWARD VOLTAGE (V)
I
F
- FORWARD CURRENT (mA)
Fig. 3 Current Transfer Ratio vs. Input Forward Current
(FOD070L only)
4500
3500
T
A
= 85°C
T
A
= 70°C
T
A
= 25°C
V
O
= 0.4V
V
CC
= 3.3V
T
A
= 25°C
Fig. 4 Current Transfer Ratio vs. Input Forward Current
(FOD073L only)
CTR - CURRENT TRANSFER RATIO (%)
V
O
= 0.4V
V
CC
= 3.3V
T
A
= 25°C
CTR - CURRENT TRANSFER RATIO (%)
4000
3500
3000
2500
3000
2500
2000
T
A
= 85°C
T
A
= 70°C
T
A
= 25°C
T
A
= 0°C
T
A
= 0°C
2000
1500
1000
500
0
0.1
T
A
= -40°C
1500
1000
500
0
0.1
T
A
= -40°C
1
10
1
10
I
F
- FORWARD CURRENT (mA)
I
F
- FORWARD CURRENT (mA)
Fig. 5 DC Transfer Charactersitics (FOD070L, FOD270L)
160
140
T
A
= 25°C
V
CC
= 3.3V
I
F
= 5mA
140
Fig. 6 DC Transfer Characterstics (FOD073L only)
T
A
= 25°C
V
CC
= 3.3V
120
I
F
= 5mA
I
F
= 4.5mA
100
4mA
80
3.5mA
3mA
60
2.5mA
2mA
40
1.5mA
1mA
20
0.5mA
I
O
- OUTPUT CURRENT (mA)
120
100
80
60
40
4mA
3.5mA
3mA
2.5mA
2mA
1.5mA
1mA
20
0.5mA
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
I
O
- OUTPUT CURRENT (mA)
I
F
= 4.5mA
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
V
O
- OUTPUT VOLTAGE (V)
V
O
- OUTPUT VOLTAGE (V)
© 2004 Fairchild Semiconductor Corporation
Page 5 of 17
8/10/04
