TCA7408 Datasheet, PDF (20/25 Pages) Texas Instruments – Low-Voltage 8-Bit I2C and SMBus I/O Expander with Interrupt Output, RESET, I/ODirection Registers, and Programmable Pull-up/Pull-down

TCA7408
SCPS235 – NOVEMBER 2011
www.ti.com
Figure 15. VPOR
The table below specifies the performance of the power-on reset feature for TCA7408 for both types of power-on
reset.
RECOMMENDED SUPPLY SEQUENCING AND RAMP RATES AT T_A = 25°C⁽¹⁾
PARAMETER
DESCRIPTION
t_FT
t_RT
t_{RR_GND}
t_{RR_POR50}
V_{CC_GH}
t_GW
V_PORF
V_PORR
Fall rate
Rise rate
Time to re-ramp (when V_CC drops to GND)
Time to re-ramp (when V_CC drops to V_{POR_MIN} – 50 mV)
Level that V_CCP can glitch down to, but not cause a functional disruption when
V_{CCX_GW} = 1 μs
Glitch width that will not cause a functional disruption when V_{CCX_GH} = 0.5 × V_CCx
Voltage trip point of POR on falling V_CC
Voltage trip point of POR on rising V_CC
(1) Not tested. Specified by design.
MIN TYP
1
0.1
40
40
0.86
1.1
MAX
100
100
1.2
10
1.22
1.34
UNIT
ms
ms
μs
μs
V
μs
V
V
20
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