Datasheet
TCA7408
SCPS235B –NOVEMBER 2011–REVISED MARCH 2013
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 MIN TYP MAX UNIT
t
FT
Fall rate 1 100 ms
t
RT
Rise rate 0.1 100 ms
t
RR_GND
Time to re-ramp (when V
CC
drops to GND) 40 μs
t
RR_POR50
Time to re-ramp (when V
CC
drops to V
POR_MIN
– 50 mV) 40 μs
Level that V
CCP
can glitch down to, but not cause a functional disruption when
V
CC_GH
1.2 V
V
CCX_GW
= 1 μs
t
GW
Glitch width that will not cause a functional disruption when V
CCX_GH
= 0.5 × V
CCx
10 μs
V
PORF
Voltage trip point of POR on falling V
CC
0.86 1.22 V
V
PORR
Voltage trip point of POR on rising V
CC
1.1 1.34 V
(1) Not tested. Specified by design.
20 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated
Product Folder Links :TCA7408