14.5 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 14-5 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 14-5. Propagation Delay Measurement Setup

14.6 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 14-6 shows the setup used to measure turn on time, denoted by the symbol tON (VDD)

1.5 V

t

ON

90%

10%

OUTPUT

0 V

V

DD

t

OFF

V

S

OUTPUT

R

L

C

L

D1

GND

0 V

t

r = 1

s

t

f = 1

s

V

DD

S1B

S1A

V

S

OUTPUT

R

L

C

L

D2

S2B

S2A

V

DD

1.5 V

Figure 14-6. tON (VDD) and tOFF (VDD) Time Measurement Setup

14.7 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 14-7 shows the setup used to measure transition time, denoted by the symbol tTRANSITION.

TMUX4821, TMUX4819

SCDS487A – OCTOBER 2025 – REVISED DECEMBER 2025

www.ti.com

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