TCA9543A_15 Datasheet, PDF (21/32 Pages) Texas Instruments – TCA9543A Low Voltage 2-Channel I2C Bus Switch With Interrupt Logic And Reset

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TCA9543A
SCPS206A – MARCH 2014 – REVISED FEBRUARY 2015
Glitches in the power supply can also affect the power-on reset performance of this device. The glitch width
(V_{CC_GW}) and height (V_{CC_GH}) are dependent on each other. The bypass capacitance, source impedance, and
device impedance are factors that affect power-on reset performance. Figure 21 and Table 3 provide more
information on how to measure these specifications.
V_CC
V_{CC_GH}
V_{CC_GW}
Figure 21. Glitch Width and Glitch Height
Time
V_POR is critical to the power-on reset. V_POR is the voltage level at which the reset condition is released and all the
registers and the I²C/SMBus state machine are initialized to their default states. The value of V_POR differs based
on the V_CC being lowered to or from 0. Figure 22 and Table 3 provide more details on this specification.
V_CC
V_PORR
V_PORF
POR
Time
Figure 22. V_POR
Time
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