TCA6408A-Q1 Datasheet, PDF (30/40 Pages) Texas Instruments – Low-Voltage 8-Bit I2C and SMBus I/O Expander With Interrupt Output

TCA6408A-Q1
SCPS234 – SEPTEMBER 2016
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Glitches in the power supply can also affect the power-on reset performance of this device. The glitch width
(t_{VCCP_GW}) and height (V_{CCP_GH}) are dependent on each other. The bypass capacitance, source impedance, and
device impedance are factors that affect power-on reset performance. Figure 38 and Table 9 provide more
information on how to measure these specifications.
V_CCP
V_{CCP_GH}
t _{VCCP_GW}
V_{CCP_MV}
Time
Figure 38. Glitch Width and Glitch Height
V_POR is critical to the power-on reset. V_PORR / V_PORF is the voltage level at which the reset condition is
released/asserted and all the registers and the I²C/SMBus state machine are initialized to their default states
(upon a release of a reset condition). The voltage that the device has a reset condition asserted or released
differs based on whether V_CCP is being lowered to or from 0. Figure 39 and Table 9 provide more details on this
specification.
V_CCP
V_PORR
V_PORF
POR
Time
Time
Figure 39. Power On Reset
30
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