LOW INPUT CURRENT
LOGIC GATE OPTOCOUPLERS
FOD2200
FOD2200
A
1
VCC 8
B
2
7
RIN
3
6
VFF
4
PULSE GENERATOR +
5
GND
VCM
–
VCC
OUTPUT VO
MONITORING
NODE
0.1 µF
BYPASS
VCM
0V
VOH
OUTPUT
VO
VOL
50 V
SWITCH AT A: IF = 1.6 mA
VO (MIN.)*
SWITCH AT B: IF = 0 mA
VO (MAX.)*
* SEE NOTE 6.
Fig. 3. Test Circuit and Typical Waveforms for Common Mode Transient Immunity
VCC1
(+5 V)
120 pF
1.1
kΩ
1
2
DATA
INPUT
3
TTL OR
TOTEM
LSTTL
4
POLE
OUTPUT
GATE
1
FOD2200
VCC 8
7
6
GND 5
VCC2
(+5 V)
DATA
OUTPUT
UP TO 16
LSTTL
LOADS
OR 4 TTL
LOADS
2
Figure 4. Recommended LSTTL to LSTTL Circuit.
VCC1
(+5 V)
120 pF (OPTIONAL*)
VCC2
(4.5 TO 20 V)
1.1
kΩ
DATA
INPUT
TOTEM
POLE
OUTPUT
GATE
TTL OR
LSTTL
1
FOD2200
1
VCC 8
2
7
3
6
GND
4
5
VCC2
5V
10 V
15 V
20 V
RL
1.1 K
2.37 K
3.83 K
5.11 K
RL
CMOS
2
DATA
OUTPUT
Figure 5. LSTTL to CMOS Interface Circuit.
VCC1 (+5 V)
DATA
INPUT
TTL OR
LSTTL
FOD2200
1.1 kΩ
1
VCC 8
2
D1
3
4
7
6
GND 5
D1 (1N4150) REQUIRED FOR
ACTIVE PULL-UP DRIVER.
Figure 6. Recommended LED Drive Circuit.
VCC (+5 V)
120 pF (OPTIONAL*)
1.1
kΩ
FOD2200
1
VCC 8
2
4.7 kΩ
DATA
INPUT
TTL OR
3
OPEN LSTTL
4
COLLECTOR
GATE
7
6
GND 5
Figure 7. Series LED Drive with Open Collector Gate
(4.7 kΩ Resistor Shunts IOH from the LED).
*The 120pF capacitor may be omitted in applications where 500ns propagation delay is sufficient.
© 2004 Fairchild Semiconductor Corporation
Page 7 of 14
7/7/04