7.7 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 7-7 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

D

EN

Output

0 V

VDD

VS

S8

3 V

S2

A0

A1

A2

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

7.8 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 7-8 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

D

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

S8

S2

Figure 7-8. Propagation Delay Measurement Setup

TMUX7208M

SCDS454 – JANUARY 2024

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