V

CC

Time

V

CC_GH

V

CC_GW

Ramp-Up

Time to Re-Ramp

Time

Ramp-Down

50 mV

TCA9534

SCPS197A – SEPTEMBER 2014 – REVISED SEPTEMBER 2014

www.ti.com

11 Power Supply Recommendations

11.1 Power-On Reset Requirements

In the event of a glitch or data corruption, TCA9534 can be reset to its default conditions by using the power-on

reset feature. Power-on reset requires that the device go through a power cycle to be completely reset. This

reset also happens when the device is powered on for the first time in an application.

The two types of power-on reset are shown in and Figure 28.

Table 8 specifies the performance of the power-on reset feature for TCA9534 for both types of power-on reset.

PARAMETER

MIN

TYP

MAX

UNIT

Fall rate

See Figure 28

1

ms

Rise rate

See Figure 28

0.1

ms

See Figure 28

2

μs

See Figure 29

1.2

V

Glitch width that will not cause a functional disruption when

See Figure 29

10

μs

(1)

Glitches in the power supply can also affect the power-on reset performance of this device. The glitch width

device impedance are factors that affect power-on reset performance. Figure 29 and Table 8 provide more

information on how to measure these specifications.

Figure 29. Glitch Width and Glitch Height

24

Submit Documentation Feedback

Copyright © 2014, Texas Instruments Incorporated

Product Folder Links: TCA9534