TCA9546A Datasheet, PDF (20/31 Pages) Texas Instruments – Low Voltage 4-Channel I2C and SMBus Switch with Reset Function

TCA9546A
SCPS205A – APRIL 2014 – REVISED FEBRUARY 2015
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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 20 and Table 2 provide more
information on how to measure these specifications.
V_CC
V_{CC_GH}
V_{CC_GW}
Figure 20. 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 21 and Table 2 provide more details on this specification.
V_CC
V_PORR
V_PORF
POR
Time
Figure 21. V_POR
Time
20
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