TA − Free-Air Temperature − °C

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

−55

−35

−15

5

25

45

65

85

105

125

VIT−, 3.3 V

G005

VIT+, 5 V

VIT+, 3.3 V

VIT−, 5 V

GND1

GND2

INB

OUTB

ISO7521C

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

GND2

NC

NC

OUTA

GND1

OUTB

VCC1

INA

VCC2

INB

GND1

NC

NC

GND2

NC

NC

INA

OUTA

GND1

GND2

GND2

V

CC2

0.1

µF

V

CC1

GND1

0.1

µF

ISO7520C, ISO7521C

SLLSE39E – JUNE 2010 – REVISED MAY 2015

www.ti.com

9.2.2 Detailed Design Procedure

Unlike optocouplers, which need external components to improve performance, provide bias, or limit current, the

ISO7521C only needs two external bypass capacitors to operate.

Figure 11. Typical ISO7521C Circuit Hook-up

9.2.3 Application Curve

Figure 12. Input Voltage Switching Threshold vs Free-Air Temperature

16

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Product Folder Links: ISO7520C ISO7521C