TCA6408A Datasheet, PDF (25/35 Pages) Texas Instruments – LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

TCA6408A
www.ti.com............................................................................................................................................................. SCPS192C – APRIL 2009– REVISED JULY 2009
Glitches in the power supply can also affect the power-on reset performance of this device. The glitch width (t_GW)
and height (t_GH) are dependent on each other. The bypass capacitance, source impedance, and device
impedance are factors that affect power-on reset performance. Figure 19 and Table 2 provide more information
on how to measure these specifications.
V_CC
t_GH
Time
t_GW
Figure 19. Glitch Width and Glitch Height
V_POR is critical to
registers and the
tIh_{2Ce /pSoMwBeur-sonstaretesemt.aVcPhOinReisatrheeinviotialtalizgeedletovetlhaetirwdheicfahutlthestaretesse.t}
condition is released and
The value of V_POR differs
all the
based
on the V_CC being lowered to or from 0. Figure 20 and Table 2 provide more details on this specification.
V_CC
V_POR
V_PORF
POR
Time
Figure 20. V_POR
Time
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