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ISO7840, ISO7840F

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SLLSEN2B – JULY 2015 – REVISED APRIL 2016

Product Folder Links: ISO7840 ISO7840F

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Copyright © 2015–2016, Texas Instruments Incorporated

(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.

6.17 Switching Characteristics—2.5-V Supply

VCC1 = VCC2 = 2.5 V ±10% (over recommended operating conditions unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPLH, tPHL

Propagation delay time

See Figure 11

7.5

11.7

17.5

ns

PWD

Pulse width distortion(1) |tPHL – tPLH|

0.66

4.2

ns

tsk(o)

Channel-to-channel output skew time(2)

Same-direction Channels

2.2

ns

tsk(pp)

Part-to-part skew time(3)

4.5

ns

tr

Output signal rise time

See Figure 11

1

3.5

ns

tf

Output signal fall time

1.2

3.5

ns

tPHZ

Disable propagation delay, high-to-high impedance

output

See Figure 12

22

45

ns

tPLZ

Disable propagation delay, low-to-high impedance

output

22

45

ns

tPZH

Enable propagation delay, high impedance-to-high

output for ISO7840

18

45

ns

Enable propagation delay, high impedance-to-high

output for ISO7840F

2

2.5

μs

tPZL

Enable propagation delay, high impedance-to-low

output for ISO7840

2

2.5

μs

Enable propagation delay, high impedance-to-low

output for ISO7840F

18

45

ns

tfs

Default output delay time from input power loss

Measured from the time VCC goes below 1.7 V.

See Figure 13

0.2

9

μs

tie

Time interval error

216 – 1 PRBS data at 100 Mbps

0.91

ns