FOD073L — LVTTL/LVCMOS Compatible Low Input Current High Gain Split Darlington Optocoupler
April 2009
FOD073L
LVTTL/LVCMOS Compatible Low Input Current
High Gain Split Darlington Optocoupler
Features
■
Low power consumption
■
Low input current: 0.5mA
■
Dual channel 8-pin SOIC package
■
High CTR: 400% minimum
■
High CMR: 10kV/µs
■
Guaranteed performance over temperature
Description
The FOD073L optocoupler consists of an AlGaAs LED
optically coupled to a high gain split darlington photo-
detector. This device is specified to operate at a 3.3V
supply voltage.
An integrated emitter – base resistor provides superior
stability over temperature.
The combination of a very low input current of 0.5mA
and a high current transfer ratio of 2000% (typical)
makes this device 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 10kV/µs.
0°C to 70°C
■
U.L. recognized (File # E90700)
■
LVTTL/LVCMOS Compatible output
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
Schematic
Package Outline
+ 1
V
F1
_ 2
8 V
CC
7 V
01
_
V
F2
3
6 V
02
Truth Table
LED
V
O
LOW
HIGH
ON
OFF
+ 4
5 GND
©2004 Fairchild Semiconductor Corporation
FOD073L Rev. 1.0
www.fairchildsemi.com
FOD073L — LVTTL/LVCMOS Compatible Low Input Current High Gain Split Darlington Optocoupler
Absolute Maximum Ratings
(No derating required up to 85°C)
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
T
STG
T
OPR
T
SOL
EMITTER
I
F
(avg)
I
F
(pk)
I
F
(trans)
V
R
P
D
DETECTOR
I
O
(avg)
V
EB
V
CC
, V
O
P
D
Average Output Current
Storage Temperature
Operating Temperature
Parameter
Value
-40 to +125
-40 to +85
260 for 10 sec
Units
°C
°C
°C
Lead Solder Temperature
(Wave solder only. See reflow profile for surface mount devices)
DC/Average Forward Input Current
Peak Forward Input Current
(50% duty cycle, 1ms P.W.)
Peak Transient Input Current (
≤
1µs P. W., 300 pps)
Reverse Input Voltage
Input Power Dissipation
Each Channel
Each Channel
Each Channel
Each Channel
Each Channel
Each Channel
Each Channel
Each Channel
Each Channel
20
40
1.0
5
35
60
0.5
-0.5 to 7
100
mA
mA
A
V
mW
mA
V
V
mW
Emitter-Base Reverse Voltage (FOD070L, FOD270L)
Supply Voltage, Output Voltage
Output power dissipation
©2004 Fairchild Semiconductor Corporation
FOD073L Rev. 1.0
www.fairchildsemi.com
2
FOD073L — LVTTL/LVCMOS Compatible Low Input Current High Gain Split Darlington Optocoupler
Electrical Characteristics
(T
A
= 0 to 70°C unless otherwise specified)
Individual Component Characteristics
Symbol Parameter
EMITTER
V
F
BV
R
Input Forward Voltage
Input Reverse
Breakdown Voltage
Logic High Output Current
Logic Low Supply Current
Logic High Supply Current
T
A
=25°C
I
F
= 1.6mA (Each Channel)
T
A
=25°C, I
R
= 10µA
(Each Channel)
I
F
= 0 mA, V
O
= V
CC
= 3.3V
(Each Channel)
I
F1
= I
F2
= 1.6mA,
V
O1
= V
O2
= Open, V
CC
= 3.3V
I
F1
= I
F2
= 0mA,
V
O1
= V
O2
= Open, V
CC
= 3.3V
5.0
1.35
1.7
1.75
V
V
Test Conditions
Min.
Typ.*
Max.
Unit
DETECTOR
I
OH
I
CCL
I
CCH
0.05
0.8
0.01
25
3
2
µA
mA
µA
Transfer Characteristics
Symbol
CTR
Parameter
COUPLED
Current Transfer Ratio
(Note 1)
Logic Low Output Voltage
Test Conditions
I
F
= 0.5mA, V
O
= 0.4V, V
CC
= 3.3V
Min.
400
Typ.*
Max.
7000
Unit
%
V
OL
I
F
= 1.6mA, I
O
= 8mA, V
CC
= 3.3V
I
F
= 5mA, I
O
= 15mA, V
CC
= 3.3V
0.07
0.07
0.3
0.4
V
Switching Characteristics
(V
CC
= 3.3 V)
Symbol Parameter
T
PHL
Propagation Delay
Time to Logic LOW
Propagation Delay
Time to Logic HIGH
Test Conditions
R
L
= 4.7k
Ω
, I
F
= 0.5mA
(Fig. 9)
R
L
= 4.7k
Ω
, I
F
= 0.5mA
(Fig. 9)
Min.
Typ.*
5
Max.
30
Unit
µs
T
PLH
25
90
µs
|CM
H
|
|CM
L
|
Common Mode Transient I
F
= 0 mA, |V
CM
| = 10 V
P-P
, T
A
= 25°C,
Immunity at Logic HIGH R
L
= 2.2k
Ω
(Note 2) (Fig. 10)
Common Mode Transient I
F
= 1.6mA, |V
CM
| = 10 V
P-P
, R
L
= 2.2k
Ω
,
Immunity at Logic LOW
T
A
= 25°C (Note 2) (Fig. 10)
1,000
1,000
10,000
10,000
V/µs
V/µs
*All typicals at T
A
= 25°C
©2004 Fairchild Semiconductor Corporation
FOD073L Rev. 1.0
www.fairchildsemi.com
3
FOD073L — LVTTL/LVCMOS Compatible Low Input Current High Gain Split Darlington Optocoupler
Electrical Characteristics
(Continued) (T
A
= 0 to 70°C unless otherwise specified)
Isolation Characteristics
Symbol
I
I-O
V
ISO
R
I-O
C
I-O
I
I-I
R
I-I
C
I-I
Characteristics
Input-Output Insulation
Leakage Current
Withstand Insulation Test
Voltage
Resistance (Input to Output)
Input-Input Insulation
Leakage Current
Input-Input Resistance
Input-Input Capacitance
Test Conditions
Relative humidity = 45%, T
A
= 25°C,
t = 5 s, V
I-O
= 3000 VDC (Note 3)
R
H
≤
50%, T
A
= 25°C, I
I-O
≤
2µA,
t = 1 min. (Note 3)
V
I-O
= 500 VDC (Note 3)
RH
≤
45%, V
I-I
= 500 VDC (Note 5)
V
I-I
= 500 VDC (Note 5)
f = 1 MHz (Note 5)
Min.
Typ.*
Max.
1.0
Unit
µA
V
RMS
2500
10
12
0.7
0.005
10
11
0.03
Ω
pF
µA
Ω
pF
Capacitance (Input to Output) f = 1 MHz (Notes 3, 4)
*All typicals at T
A
= 25°C
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. 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
> 2.0V). 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).
3. 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.
4. CI-O is measured by shorting pins 1 and 2 or pins 3 and 4 together and pins 5 through 8 shorted together.
5. Measured between pins 1 and 2 shorted together, and pins 3 and 4 shorted together.
©2004 Fairchild Semiconductor Corporation
FOD073L Rev. 1.0
www.fairchildsemi.com
4
FOD073L — LVTTL/LVCMOS Compatible Low Input Current High Gain Split Darlington Optocoupler
Typical Performance Curves
Fig. 1 Input Forward Current vs Forward Voltage
100
3500
Fig. 2 Current Transfer Ratio vs. Input Forward Current
CTR --CURRENT TRANSFER RATIO (%)
CTR CURRENT TRANSFER RATIO (%)
V
O
= 0.4V
V
CC
= 3.3V
T
A
= 25°C
3000
2500
2000
I
F
- FORWARD CURRENT (mA)
T
A
= 85°C
T
A
= 70°C
T
A
= 25°C
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
1500
1000
500
0
0.1
T
A
= -40°C
0.01
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 DC Transfer Characterstics
140
10
Fig. 4 Supply Current vs Input Forward Current
I
CC
- (Per Channel) - Supply Current (mA)
T
A
= 25°C
V
CC
= 3.3V
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
0
0.0
I
O
- OUTPUT CURRENT (mA)
1
0.1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0.01
0.1
1
10
V
O
- OUTPUT VOLTAGE (V)
I
F
- Input Forward Current (mA)
Fig. 5 Output Current vs Input Forward Current
70
Fig. 6 Propagation Delay vs. Ambient Temperature
V
CC
= 3.3V
IF = 0.5mA
R
L
= 4.7kΩ
1/f = 100µs
Duty Cycle = 10%
60
100
t
P
- Propagation Delay (µs)
I
O
- Output Current (mA)
T
A
= 70°C, 85°C
10
50
T
A
= -40°C
T
A
= 0°C
T
A
= 25°C
40
t
PLH
30
1
V
O
= 0.4V
V
CC
= 3.3V
T
A
= 25°C
0.1
0.1
1
10
20
10
t
PHL
0
-40
-20
0
20
40
60
80
100
I
F
- Forward Current (mA)
T
A
- Ambient Temperature (°C)
©2004 Fairchild Semiconductor Corporation
FOD073L Rev. 1.0
www.fairchildsemi.com
5
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