ISO7420FE datasheet(12/25 Pages) TI

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S0417-01

CC1

0.1 F

2 mm

max.

from

CC1

OUTA

INB

OUTPUT

INPUT

GND1

ISO7421

CC2

0.1 F

2 mm

max.

from

CC2

INA

OUTB

OUTPUT

INPUT

GND2

ISO7420E, ISO7420FE, ISO7420FCC

ISO7421E, ISO7421FE, ISO7421FCC

SLLSE45D

– DECEMBER 2010 – REVISED DECEMBER 2011

www.ti.com

APPLICATION INFORMATION

Figure 6. Typical ISO7421x Application Circuit

Note: For detailed layout recommendations, see Application Note SLLA284, Digital Isolator Design Guide.

SUPPLY CURRENT EQUATIONS

Maximum Supply Current Equations:

(Calculated over recommended operating temperature range and Silicon process variation)

ISO7420

At VCC1 = VCC2 = 3.3V ± 10%

ICC1(max) = ICC1_Q (max) + 1.791 x 10

-2 x f

(1)

ICC2(max) = ICC2_Q (max) + 1.687 x 10

-2 x f + 3.570 x 10-3 x f x C

(2)

At VCC1 = VCC2 = 5V ± 10%

ICC1(max) = ICC1_Q (max) + 3.152 x 10

-2 x f

(3)

ICC2(max) = ICC2_Q (max) + 2.709 x 10

-2 x f + 5.365 x 10-3 x f x C

(4)

ISO7421

At VCC1 = VCC2 = 3.3V ± 10%

ICC1(max) = ICC1_Q (max) + 1.726 x 10

-2 x f + 1.785 x 10-3 x f x C

(5)

ICC2(max) = ICC2_Q (max) + 1.726 x 10

-2 x f + 1.785 x 10-3 x f x C

(6)

At VCC1 = VCC2 = 5V ± 10%

ICC1(max) = ICC1_Q (max) + 2.920 x 10

-2 x f + 2.682 x 10-3 x f x C

(7)

ICC2(max) = ICC2_Q (max) + 2.920 x 10

-2 x f + 2.682 x 10-3 x f x C

(8)

ICC1_Q (max) and ICC2_Q (max) are equivalent to the maximum supply currents measured in mA under DC input

conditions (provided in the specification tables of this data sheet); f is data rate in Mbps of both channels; CL is

the capacitive load in pF of both channels. ICC1(max) and ICC2(max) are measured in mA.

Typical Supply Current Equations:

(Calculated over recommended operating temperature range and Silicon process variation)

ISO7420

At VCC1 = VCC2 = 3.3V

ICC1(typ) = ICC1_Q (typ) + 1.528 x 10

-2 x f

(9)

ICC2(typ) = ICC2_Q (typ) + 1.637 x 10

-2 x f + 3.275 x 10-3 x f x C

(10)

At VCC1 = VCC2 = 5V

ICC1(typ) = ICC1_Q (typ) + 2.640 x 10

-2 x f

(11)

ICC2(typ) = ICC2_Q (typ) + 2.502 x 10

-2 x f + 4.919 x 10-3 x f x C

(12)

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Product Folder Link(s): ISO7420E ISO7420FE ISO7420FCC ISO7421E ISO7421FE ISO7421FCC

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