ISO7420E, ISO7420FE, ISO7421E, ISO7421FE

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SLLSE45F – DECEMBER 2010 – REVISED JULY 2015

6.12 Switching Characteristics: VCC1 = 3.3 V ± 10%, VCC2 = 5 V ± 10%

TA = –40°C to 125°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ISO7420x

7.5

12

tPLH, tPHL

Propagation delay time

ns

ISO7421x

7.5

14

See Figure 16.

ISO7420x

0.7

3

PWD(1)

Pulse width distortion |tPHL – tPLH|

ns

ISO7421x

0.7

3.6

ISO7420x

0.5

1.5

tsk(o)

(2)

Channel-to-channel output skew time

ns

ISO7421x

0.5

3

ISO7420x

4.6

tsk(pp)

(3)

Part-to-part skew time

ns

ISO7421x

8.5

tr

Output signal rise time

1.7

ns

See Figure 16.

tf

Output signal fall time

1.6

ns

tfs

Fail-safe output delay time from input power loss

See Figure 17.

6

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.

6.13 Switching Characteristics: VCC1 and VCC2 = 3.3 V ± 10%

TA = –40°C to 125°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPLH, tPHL

Propagation delay time

8.5

14

ns

See Figure 16

PWD(1)

Pulse width distortion |tPHL – tPLH|

ISO7420x and ISO7421x

0.5

2

ns

ISO7420x

0.4

2

tsk(o)

(2)

Channel-to-channel output skew time

ns

ISO7421x

0.4

3

ISO7420x

6.2

tsk(pp)

(3)

Part-to-part skew time

ns

ISO7421x

6.8

tr

Output signal rise time

2

ns

See Figure 16

tf

Output signal fall time

1.8

ns

tfs

Fail-safe output delay time from input power loss

See Figure 17

6

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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