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Fairchild Semiconductor |
LVTTL/LVCMOS COMPATIBLE LOW INPUT
CURRENT HIGH GAIN SPLIT DARLINGTON
OPTOCOUPLERS
SINGLE CHANNEL:
DUAL CHANNEL:
FOD070L
FOD073L
FOD270L
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.
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
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
VO
LOW
HIGH
8
1
8
1
8
N/C 1
+2
V
F
_3
N/C 4
8
V
CC
7
V
B
6V
O
5 GND
FOD070L / FOD270L
1
+1
V
F1
_2
_3
V
F2
+4
8
V
CC
7
V
01
6V
02
5 GND
FOD073L
© 2004 Fairchild Semiconductor Corporation
Page 1 of 17
8/10/04
SINGLE CHANNEL:
DUAL CHANNEL:
LVTTL/LVCMOS COMPATIBLE LOW INPUT
CURRENT HIGH GAIN SPLIT DARLINGTON
OPTOCOUPLERS
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
Each Channel
Peak Forward Input Current (50% duty cycle, 1 ms P.W.) Each Channel
Peak Transient Input Current - (≤1 µs P.W., 300 pps)
Each Channel
Reverse Input Voltage
Each Channel
Input Power Dissipation
Each Channel
DETECTOR
Average Output Current
Each Channel
Emitter-Base Reverse Voltage (FOD070L, FOD270L)
Each Channel
Supply Voltage, Output Voltage
Each Channel
Output power dissipation
Each Channel
Symbol
TSTG
TOPR
TSOL
IF (avg)
IF (pk)
IF (trans)
VR
PD
IO (avg)
VEB
VCC, VO
PD
Value
-40 to +125
-40 to +85
260 for 10 sec
20
40
1.0
5
35
60
0.5
-0.5 to 7
100
Units
°C
°C
°C
mA
mA
A
V
mW
mA
V
V
mW
ELECTRICAL CHARACTERISTICS (TA = 0 to 70°C Unless otherwise specified)
INDIVIDUAL COMPONENT CHARACTERISTICS
Parameter
EMITTER
Input Forward Voltage
Input Reverse Breakdown
Voltage
DETECTOR
Logic high output current
Logic Low Supply
Current
Logic High Supply
Current
Test Conditions Symbol
TA =25°C
Each Channel (IF = 1.6 mA)
(TA =25°C, IR = 10 µA)
Each Channel
VF
BVR
(IF = 0 mA, VO = VCC = 3.3 V)
Each Channel
IOH
IF = 1.6 mA, VO = Open, VCC = 3.3V
IF1 = IF2 = 1.6mA
VO1 = VO2 = Open, VCC = 3.3 V
IF = 0 mA, VO = Open, VCC = 3.3V
IF1 = IF2 = 0mA
VO1 = VO2 = Open, VCC = 3.3 V
ICCL
ICCH
Device
All
All
FOD070L
FOD270L
FOD073L
FOD070L
FOD270L
FOD073L
FOD070L
FOD270L
FOD073L
Min Typ** Max
1.35 1.7
1.75
5.0
0.05 25
0.5 1.5
0.8 3
0.01 1
0.01 2
**All typicals at TA = 25°C
Unit
V
V
µA
mA
µA
© 2004 Fairchild Semiconductor Corporation
Page 2 of 17
8/10/04
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