TCA9555_16 Datasheet, PDF (30/46 Pages) Texas Instruments – Low-Voltage 16-Bit I2C and SMBus I/O Expander with Interrupt Output and Configuration Registers

TCA9555
SCPS200D – JULY 2009 – REVISED JULY 2016
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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 41 and Table 9 provide more
information on how to measure these specifications.
V_CC
V_{CC_GH}
V_{CC_GW}
V_{CC_MV}
Time
Figure 41. Glitch Width and Glitch Height
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 42 and Table 9 provide more details on this specification.
V_CC
V_POR
V_PORF
POR
Time
Figure 42. V_POR
Time
30
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