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擄C to 85擄C and a V
CC
range of 4.5 volts to 20
volts. Low I
F
and wide V
CC
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
鈥?1 kV/碌s Minimum Common Mode
Rejection
鈥?Compatible with LSTTL, TTL, and CMOS
Logic
鈥?Wide V
CC
Range (4.5 to 20 V)
鈥?2.5 Mbd Guaranteed over Temperature
鈥?Low Input Current (1.6 mA)
鈥?Three State Output (No Pullup Resistor
Required)
鈥?Guaranteed Performance from 0擄C to 85擄C
鈥?Hysteresis
鈥?Safety Approvals Pending 鈥?UL, CSA, VDE
鈥?V
ISO
= 5kVRMS
APPLICATION
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
8 V
CC
7 V
O
6 V
E
5 GND
SHIELD
Schematic
I
CC
8
I
F
+
V
F
鈥?/div>
2
I
E
3
SHIELD
6
5
I
O
7
V
CC
V
O
V
E
GND
TRUTH TABLE (Positive Logic)
LED
On
Off
On
Off
Enable
H
H
L
L
Output
Z
Z
H
L
漏 2004 Fairchild Semiconductor Corporation
Page 1 of 14
7/7/04
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