ISO7340

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

INA

INB

INC

IND

OUTA

OUTB

OUTC

OUTD

GND2

VCC2

0.1 µF

2 mm max

from VCC2

EN

GND2

NC

GND1

2 mm max

from VCC1

GND1

0.1 µF

VCC1

ISO7341

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

INA

INB

INC

OUTD

OUTA

OUTB

OUTC

IND

GND2

VCC2

0.1 µF

2 mm max

from VCC2

EN2

GND2

EN1

GND1

2 mm max

from VCC1

GND1

0.1 µF

VCC1

23

ISO7340C, ISO7340FC, ISO7341C, ISO7341FC, ISO7342C, ISO7342FC

www.ti.com

SLLSEI6G – SEPTEMBER 2014 – REVISED JANUARY 2017

Product Folder Links: ISO7340C ISO7340FC ISO7341C ISO7341FC ISO7342C ISO7342FC

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Copyright © 2014–2017, Texas Instruments Incorporated

Typical Application (continued)

10.2.1.1 Design Requirements

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

the ISO734x family of devices only requires two external bypass capacitors to operate.

10.2.1.2 Detailed Design Procedure

10.2.1.2.1

Typical Supply Current Equations

For the equations in this section, the following is true:

•

ICC1 and ICC2 are typical supply currents measured in mA

•

f is data rate measured in Mbps

•

CL is the capacitive load measured in pF

10.2.1.2.1.1

ISO7340x

At VCC1 = VCC2 = 5 V:

ICC1 = 0.54366 + (0.0873 × f)

(1)

ICC2 = 2.74567 + (0.08433 × f) + (0.01 × f × CL)

(2)

At VCC1 = VCC2 = 3.3 V:

ICC1 = 0.3437 + (0.04922 × f)

(3)

ICC2 = 2.1068 + (0.04374 × f) + (0.007045 × f × CL)

(4)

10.2.1.2.1.2

ISO7341x

At VCC1 = VCC2 = 5 V:

ICC1 = 1.7403 + (0.1006 × f) + (0.001711 × f × CL)

(5)

ICC2 = 2.502 + (0.09629 × f) + (0.00687 × f × CL)

(6)

At VCC1 = VCC2 = 3.3 V:

ICC1 = 1.2915 + (0.046 × f) + (0.00185 × f × CL)

(7)

ICC2 = 1.8833 + (0.0566 × f) + (0.004514 × f × CL)

(8)

10.2.1.2.1.3

ISO7342x

At VCC1 = VCC2 = 5 V:

ICC1, ICC2 = 2.1254 + (0.08694 × f) + (0.004868 × f × CL)

(9)

At VCC1 = VCC2 = 3.3 V:

ICC1, ICC2 = 1.5912 + (0.0410 × f) + (0.003785 × f × CL)

(10)

Figure 21. Typical ISO7340x Circuit Hook-up

Figure 22. Typical ISO7341x Circuit Hook-up