FOD0721 datasheet(1/12 Pages) FAIRCHILD

Part #	FOD0721

Description	High CMR, 25Mbit/sec Logic Gate Optocoupler

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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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 VDD2

VI

H

L

VO

H

L

LED

OFF

ON

NC

VO

GND2

Truth Table

*: Pin 3 must be left unconnected

VDD1

VI

*

GND1

p

roprietary coplanar packaging technology, Optoplanar,

High CMR, 25Mbit/sec Logic Gate Optocoupler

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