7.5 tON (VDD) Time

The tON (VDD) time is defined as the time taken by the output of the device to rise to 90% after the supply has

risen past the supply threshold. The 90% measurement is used to provide the timing of the device turning on in

the system. Figure 7-5 shows the setup used to measure turn on time, denoted by the symbol tON (VDD).

VDD

Supply

Ramp

0 V

4.5 V

tON

90%

Output

tr = 10 µs

RL

CL

VDD

VSS

VSS

0.1 µF

0.1 µF

S1

GND

D1

Output

0 V

VDD

VS

S2

SELx

3 V

CL

Output

VS

D2

Figure 7-5. tON (VDD) Time Measurement Setup

7.6 Propagation Delay

Propagation delay is defined as the time taken by the output of the device to rise or fall 50% after the input signal

has risen or fallen past the 50% threshold. Figure 7-6 shows the setup used to measure propagation delay,

denoted by the symbol tPD.

RL

CL

VDD

VSS

VDD

VSS

0.1 µF

0.1 µF

S1

GND

D1

Output

VS

S2

250 mV

0 V

tPD 1

Output

0 V

tProp Delay = max ( tPD 1, tPD 2)

Input

(VS)

tr < 40ps

tf < 40ps

tPD 2

50%

50%

50%

50%

50 Ω

RL

CL

Output

D2

VS

50 Ω

Figure 7-6. Propagation Delay Measurement Setup

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TMUX7221, TMUX7222

SCDS444A – FEBRUARY 2023 – REVISED SEPTEMBER 2023

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