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 speci鏗乪d to operate at a 3.3V supply voltage.
The split darlington con鏗乬uration separating the input photodiode and the 鏗乺st
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 鈥?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/碌s.
8
1
8
1
FOD070L
FOD073L
FOD270L
8
1
FEATURES
鈥?Low power consumption
鈥?Low input current - 0.5 mA
鈥?Available in single channel 8-pin DIP (FOD270L), 8-pin SOIC (FOD070L)
and dual channel 8-pin SOIC
鈥?High CTR-2000%
鈥?High CMR-10 kV/碌s
鈥?Guaranteed performance over temperature 0擄C to 70擄C
鈥?U.L. recognized (File # E90700)
鈥?LVTTL/LVCMOS Compatible output
N/C 1
8 V
CC
+ 1
V
+ 2
V
F
_
3
6 V
O
_
V
F2
N/C 4
5 GND
+ 4
5 GND
3
6 V
02
7 V
B
F1
8 V
CC
_ 2
7 V
01
FOD070L / FOD270L
FOD073L
APPLICATIONS
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Digital logic ground isolation 鈥?LVTTL/LVCMOS
Telephone ring detector
EIA-RS-232C line receiver
High common mode noise line receiver
碌P bus isolation
Current loop receiver
TRUTH TABLE
LED
ON
OFF
V
O
LOW
HIGH
漏 2004 Fairchild Semiconductor Corporation
Page 1 of 17
8/10/04
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