ISO7420FE datasheet(7/25 Pages) TI

7 / 25 page

ISO7420E, ISO7420FE, ISO7420FCC

ISO7421E, ISO7421FE, ISO7421FCC

www.ti.com

SLLSE45D

– DECEMBER 2010 – REVISED DECEMBER 2011

ELECTRICAL CHARACTERISTICS

VCC1 and VCC2 = 3.3 V ± 10%, TA = -40°C to 125°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IOH = –4 mA; see Figure 1.

VCCx

(1) – 0.4

VOH

High-level output voltage

IOH = –20 μA; see Figure 1.

VCCx

(1) – 0.1

3.3

IOL = 4 mA; see Figure 1.

0.2

0.4

VOL

Low-level output voltage

IOL = 20 μA; see Figure 1.

0.1

VI(HYS)

Input threshold voltage hysteresis

400

IIH

High-level input current

μA

INx at 0 V or VCC

IIL

Low-level input current

–10

μA

CMTI

Common-mode transient immunity

VI = VCC or 0 V; see Figure 3.

kV/

μs

SUPPLY CURRENT (All inputs switching with square wave clock signal for dynamic ICC measurement)

ISO7420x

ICC1

0.2

0.4

DC Input: VI = VCC or 0 V,

DC to 1 Mbps

AC Input: CL = 15pF

ICC2

2.6

3.7

ICC1

0.4

0.6

10 Mbps

ICC2

3.3

4.3

Supply current for VCC1 and VCC2

ICC1

0.6

0.9

25 Mbps

CL = 15pF

ICC2

4.4

5.6

ICC1

1.3

50 Mbps

ICC2

6.2

7.5

ISO7421x

ICC1

1.8

2.8

DC Input: VI = VCC or 0 V,

DC to 1 Mbps

AC Input: CL = 15pF

ICC2

1.8

2.8

ICC1

2.2

3.2

10 Mbps

ICC2

2.2

3.2

Supply current for VCC2 and VCC2

ICC1

2.8

4.1

25 Mbps

CL = 15pF

ICC2

2.8

4.1

ICC1

3.8

5.5

50 Mbps

ICC2

3.8

5.5

(1)

VCCx is the supply voltage for the output channel that is being measured

SWITCHING CHARACTERISTICS

VCC1 and VCC2 = 3.3 V ± 10%, TA = -40°C to 125°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

E-grade

8.5

tPLH, tPHL

Propagation delay time

CC-grade

See Figure 1.

19.5

PWD(1)

Pulse width distortion |tPHL – tPLH|

ISO7420x and ISO7421x

0.5

ISO7420x

0.4

tsk(o)

(2)

Channel-to-channel output skew time

ISO7421x

0.4

ISO7420x

6.2

tsk(pp)

(3)

Part-to-part skew time

ISO7421x

6.8

Output signal rise time

See Figure 1.

Output signal fall time

1.8

tfs

Fail-safe output delay time from input power loss

See Figure 2.

μs

(1)

Also known as pulse skew.

(2)

tsk(o) is the skew between outputs of a single device with all driving inputs connected together and the outputs switching in the same

direction while driving identical loads.

(3)

tsk(pp) is the magnitude of the difference in propagation delay times between any terminals of different devices switching in the same

direction while operating at identical supply voltages, temperature, input signals and loads.

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