TMUX7208 datasheet(21/42 Pages) TI

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7.5 tON(EN) and tOFF(EN)

Turn-on time is defined as the time taken by the output of the device to rise to 90% after the enable has risen

past the logic threshold. The 90% measurement is utilized to provide the timing of the device. System level

timing can then account for the time constant added from the load resistance and load capacitance. Figure 7-7

shows the setup used to measure turn-on time, denoted by the symbol tON(EN).

Turn-off time is defined as the time taken by the output of the device to fall to 10% after the enable has fallen

past the logic threshold. The 10% measurement is utilized to provide the timing of the device. System level

timing can then account for the time constant added from the load resistance and load capacitance. Figure 7-7

shows the setup used to measure turn-off time, denoted by the symbol tOFF(EN).

3 V

VEN

0 V

50%

tON

tOFF

10%

90%

Output

tr < 20 ns

tf < 20 ns

VDD

VSS

VDD

VSS

0.1 µF

GND

Output

0 V

VEN

Figure 7-5. Turn-On and Turn-Off Time Measurement Setup

7.6 Break-Before-Make

Break-before-make delay is a safety feature that prevents two inputs from connecting when the device is

switching. The output first breaks from the on-state switch before making the connection with the next on-state

switch. The time delay between the break and the make is known as break-before-make delay. Figure 7-6 shows

the setup used to measure break-before-make delay, denoted by the symbol tOPEN(BBM).

VDD

VSS

VDD

VSS

0.1 µF

GND

Output

S2-S7

3 V

0 V

tBBM 1

80%

Output

0 V

tOPEN (BBM) = min ( tBBM 1, tBBM 2)

tBBM 2

VEN

tr < 20ns

tf < 20ns

VEN

Figure 7-6. Break-Before-Make Delay Measurement Setup

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TMUX7208, TMUX7209

SCDS418 – DECEMBER 2020

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