6.5 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 6-5 shows the setup used to measure propagation delay,

denoted by the symbol tPD.

RL

CL

VDD

0.1 µF

GND

Output

VS

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

D

SB

SA

Figure 6-5. Propagation Delay Measurement Setup

6.6 tON (VDD) and tOFF (VDD) Time

The tON (VDD) time is defined as the time taken by the output of the device to rise 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 6-6 shows the setup used to measure turn on time, denoted by the symbol tON (VDD)

RL

CL

VDD

0.1 µF

GND

Output

VS

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

VS

50 Ω

D1

S1B

S1A

D2

S2B

S2A

Figure 6-6. tON (VDD) and tOFF (VDD) Time Measurement Setup

6.7 Transition Time

Transition time is defined as the time taken by the output of the device to rise or fall 10% after the control signal

has risen or fallen past the logic threshold. The 10% transition 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 6-7 shows the setup used to measure transition time, denoted by the symbol tTRANSITION.

TMUX2821, TMUX2819

SCDS488 – DECEMBER 2025

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