Fairchild FOD0720 service manual

FOD0721, FOD0720, FOD0710 — High CMR, 25Mbit/sec Logic Gate Optocoupler

December 2010

FOD0721, FOD0720, FOD0710 High CMR, 25Mbit/sec Logic Gate Optocoupler

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 proprietary coplanar packaging technology, Optoplanar,

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 photodiode, 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

V

1

DD1

V

2

I

3

*

GND1

4 5

*: Pin 3 must be left unconnected

Tr uth Table

LED

V

I

H

OFF

L

V

H

ON

V

8

DD2

NC

7

V

6

O

GND2

O

L

Pin Definitions

Pin Number Pin Name Pin Function Description

1V

2V

DD1

I

3 LED Anode – must be left unconnected

4 GND1 Input Ground

5 GND2 Output Ground

6V

O

7NCNot Connected

8V

DD2

Input Supply Voltage

Input Data

Output Data

Output Supply Voltage

FOD0721, FOD0720, FOD0710 — High CMR, 25Mbit/sec Logic Gate Optocoupler

Absolute Maximum Ratings

(T

= 25°C unless otherwise speciﬁed.)

A

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.

Symbol Parameter Value Units

T

STG

T

OPR

T

SOL

V

DD1

V

I

V

DD2

V

D

I

O

PD1 Input Power Dissipation 90 mW

PD2 Output Power Dissipation 70 mW

Storage Temperature -40 to +125 °C

Operating Temperature -40 to +100 °C

Lead Solder Temperature 260 for 10 sec °C

Reﬂow Temperature Proﬁle (Refer to Relow Proﬁle)

Input Supply Voltage 0 to 6.0 V

Input Voltage -0.5 to V

+ 0.5 V

DD1

Input DC Current -10 to +10 mA

Output Supply Voltage 0 to 6.0 V

Output Voltage -0.5 to V

+ 0.5 V

DD2

Average Output Current 10 mA

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings.

Symbol Parameter Min. Max. Unit

T

OPR

V

, V

DD1

V

IH

V

IL

t

, t

r

f

•A 0.1µF bypass capacitor must be connected between pins 1 and 4, and 5 and 8

• Pin 3 must be left unconnected

Ambient Operating Temperature -40 +100 °C

Supply Voltages 4.5 5.5 V

DD2

Logic High Input Voltage 2.0 V

DD1

Logic Low Input Voltage 0 0.8 V

Input Signal Rise and Fall Time 1.0 ms

V

≤

Ω

FOD0721, FOD0720, FOD0710 — High CMR, 25Mbit/sec Logic Gate Optocoupler

Electrical Characteristics

(T

= -40°C to 100°C and 4.5V ≤ V

A

5.5V, all typicals are at T

DD

= 25°C, V

A

DD

= 5V)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

INPUT CHARACTERISTICS

I

DD1L

I

DD1H

I

DD1

Logic Low Input Supply Current V

Logic High Input Supply Current V

= 0V 6.5 10.0 mA

I

= V

I

DD1

0.8 3.0 mA

Input Supply Current 13.0 mA

I

Input Current -10 +10 µA

I

OUTPUT CHARACTERISTICS

I

DD2L

I

DD2H

V

Isolation Characteristics

Logic Low Output Supply Current V

Logic High Output Supply Current V

Logic High Output Voltage I

OH

Logic Low Output Voltage I

OL

= 0V 5.5 9 mA

I

= V

I

DD1

= -20µA, V

O

I

= -4mA, V

O

= 20µA, V

O

I

= 4mA, V

O

(T

= -40°C to +100°C unless otherwise speciﬁed.)

A

= V

I

= V

I

= V

I

= V

I

IH

IL

5.3 9 mA

4.4 5.0 V

4.0 4.8 V

0 0.1 V

0.5 1.0 V

Symbol Characteristics Test Conditions Min. Typ.* Max. Unit

V

R

C

*All typicals at T

Input-Output Isolation Voltage f = 60Hz, t = 1.0 min, I

ISO

Isolation Resistance V

ISO

Isolation Capacitance V

ISO

= 25°C

A

= 500V

I-O

= 0 , f = 1.0MHz

I-O

(1)

I-O

(1)

Notes:

1. Device is considered a two terminal device: Pins 1, 2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are shorted together.

2. 3,750 VAC RMS for 1 minute duration is equivalent to 4,500 VAC RMS for 1 second duration.

10µA

(1)(2)

3750 Vac

11

10

0.2 pF

RMS

≤

FOD0721, FOD0720, FOD0710 — High CMR, 25Mbit/sec Logic Gate Optocoupler

Switching Characteristics

(T

= -40°C to 100°C and 4.5V ≤ V

A

5.5V, all typicals are at T

DD

= 25°C, V

A

DD

= 5V)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

t

PHL

t

PLH

PWD Pulse Width Distortion, | t

Data Rate FOD0710

t

PSK

t

R

t

F

|CM

Notes:

3. t

PSK

temperature within the recommended operating conditions.

4. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the common mode impulse signal. Vcm, to assure that the output will remain high. Common mode transient immunity at output low is the maximum tolerable (negative dVcm/dt on the trailing edge of the common pulse signal, Vcm, to assure that the output will remain low.

Propagation Delay Time to

C

= 15pF 21 40 ns

L

Logic Low Output

Propagation Delay Time to

C

= 15pF 23 40 ns

L

Logic High Output

– t

PLH

|

= 15pF 2 8 ns

L

= 15pF 2 8 ns

L

= 15pF 2 6 ns

L

PHL

FOD0710 PW = 80ns, C

FOD0720 PW = 40ns, C

FOD0721 PW = 40ns, C

FOD0720, FOD0721

Propagation Delay Skew C

= 15pF

L

(3)

Output Rise Time (10%–90%) 5 ns

Output Fall Time (90%–10%) 4.5 ns

| Common Mode Transient

H

Immunity at Output High

| Common Mode Transient

L

Immunity at Output Low

is equal to the magnitude of the worst case difference in t

VI = V VCM = 1000V

VI = 0V, VO < 0.8, V

CM

, VO > 0.8 V

DD1

= 1000V

(4)

PHL

DD2

and/or t

20 40 kV/µs

that will be seen between units at any given

PLH

12.5 Mb/s

25 Mb/s

20 ns