Datasheet

FOD0721, FOD0720, FOD0710 — High CMR, 25Mbit/sec Logic Gate Optocoupler
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD0721, FOD0720, FOD0710 Rev. 1.0.9
December 2010
FOD0721, FOD0720, FOD0710
Features
■
20kV/µs minimum CMR
■
40ns max. propagation delay
■
Data Rate, Non-Return Zero Coding
– 25Mbit/sec (FOD0721 and FOD0720)
– 12.5Mbit/sec (FOD0710)
■
Pulse Width Distortion
– 6ns (FOD0721)
– 8ns (FOD0720 and FOD0710)
■ +5V CMOS compatibility
■
Extended industrial temperate range
– -40 to 100°C temperature range
■
Safety and regulatory approvals
– UL1577, 3750 VACrms for 1 min. (File #E90700,
Volume 2)
– IEC60747-5-2 pending approval
Applications
■
Industrial fieldbus communications
– Profibus, DeviceNet, CAN, RS485
■
Programmable logic control
■
Isolated data acquisition system
Description
The FOD0721/0720/0710 family utilizes Fairchild’s
®
and optimized IC design to guarantee minimum 20kV/µs
Common Mode Noise Rejection (CMR) rating.
These high-speed logic gate optocouplers consist of a
high-speed AlGaAs LED driven by a CMOS IC coupled
to a CMOS detector IC, comprising an integrated photo-
diode, a high-speed transimpedance amplifier and a
voltage comparator with an output driver. The CMOS
technology coupled to the high efficiency of the LED
achieves low power consumption as well as very high
speed (40ns propagation delay, 6ns pulse width
distortion).
These devices are available in a compact 8-pin small
outline package.
Functional Schematic
1
2
3
4 5
6
7
8
V
DD2
V
I
H
L
V
O
H
L
LED
OFF
ON
NC
V
O
GND2
Tr uth Table
*: Pin 3 must be left unconnected
V
DD1
V
I
*
GND1
proprietary coplanar packaging technology, Optoplanar,
High CMR, 25Mbit/sec Logic Gate Optocoupler