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Fairchild Semiconductor |
LOW INPUT CURRENT
LOGIC GATE OPTOCOUPLERS
FOD2200
DESCRIPTION
The FOD2200 is an optically coupled logic gate that combine an AlGaAs LED
and an integrated high gain photo detector. The detector has a three state
output stage and has a detector threshold with hysteresis. The three state
output eliminates the need for a pullup resistor and allows for direct drive of
data busses. The hysteresis provides differential mode noise immunity and
eliminates the potential for output signal chatter.
The Electrical and Switching Characteristics of the FOD2200 are guaranteed
over the temperature range of 0°C to 85°C and a VCC range of 4.5 volts to 20
volts. Low IF and wide VCC range allow compatibility with TTL, LSTTL, and
CMOS logic and result in lower power consumption compared to other high
speed optocouplers. Logic signals are transmitted with a maximum propaga-
tion delay of 300 nsec. The FOD2200 is useful for isolating high speed logic
interfaces, buffering of input and output lines, and implementing isolated line
receivers in high noise environments.
8
1
8
1
8
1
FEATURES
• 1 kV/µs Minimum Common Mode
Rejection
• Compatible with LSTTL, TTL, and CMOS
Logic
• Wide VCC Range (4.5 to 20 V)
• 2.5 Mbd Guaranteed over Temperature
• Low Input Current (1.6 mA)
• Three State Output (No Pullup Resistor
Required)
• Guaranteed Performance from 0°C to 85°C
• Hysteresis
• Safety Approvals Pending – UL, CSA, VDE
• VISO = 5kVRMS
APPLICATION
• Isolation of High Speed Logic Systems
• Computer-Peripheral Interfaces
• Microprocessor System Interfaces
• Ground Loop Elimination
• Pulse Transformer Replacement
• Isolated Buss Driver
• High Speed Line Receiver
NC 1
ANODE 2
CATHODE 3
NC 4
Schematic
IF
+
2
VF
–
3
SHIELD
SHIELD
8 VCC
7 VO
6 VE
5 GND
ICC
VCC
8
IO
7 VO
IE
6 VE
GND
5
TRUTH TABLE (Positive Logic)
LED
On
Off
On
Off
Enable
H
H
L
L
© 2004 Fairchild Semiconductor Corporation
Page 1 of 14
Output
Z
Z
H
L
7/7/04
LOW INPUT CURRENT
LOGIC GATE OPTOCOUPLERS
ABSOLUTE MAXIMUM RATINGS (TA = 25°C unless otherwise specified)
Parameter
Symbol
Value
Storage Temperature
Operating Temperature
Lead Solder Temperature (1.6mm below seating
plane)
EMITTER
Peak Transient Input Current (≤1µs PW, 300 pps)
Average Forward Input Current
Reverse Input Voltage
Output Power Dissipation
(No derating required up to 85°C)
DETECTOR
Supply Voltage
Average Output Current
Three State Enable Voltage
Output Voltage
Output Power Dissipation
(No derating required up to 85°C)
TSTG
TOPR
TSOL
IF (PK)
IF
VR
PD
VCC
IO
VE
VO
PD
-40 to +125
-40 to +85
260 for 10 sec
1.0
10
5.0
45
0 to 20
25
-0.5 to 20
-0.5 to 20
150
FOD2200
Units
°C
°C
°C
A
mA
V
mW
V
mA
V
V
mW
RECOMMENDED OPERATING CONDITIONS
Parameter
Forward Input Current
Forward Input Current
Supply Voltage, Output
Enable Voltage, Low Level
Enable Voltage, High Level
Operating Temperature
Fan Out (TTL load)
Symbol
IF(ON)
IF(OFF)
VCC
VEL
VEH
TA
N
Min
1.6*
4.5
0
2.0
0
Max Units
5 mA
0.1 mA
20 V
0.8 V
20 V
+85 °C
4
*The initial switching threshold is 1.6mA or less. It is recommended that 2.2 mA be used to permit at least a 20% CTR degradation
guardband.
© 2004 Fairchild Semiconductor Corporation
Page 2 of 14
7/7/04
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