Datasheet
3.3 V
V
CCIOPORH
1.2 V
V
CCPORH
V
CCIOPORL
V (1.2 V)
V / V (3.3 V)
CC
CCIO CCP
nPORRST
8
6
6
7
7
93
V
CCPORL
V
IL(PORRST)
V / V
CCIO CCP
V
CC
V
CCPORL
V
IL(PORRST)
V
IL
V
IL
V
IL
V
CCIOPORH
V
CCPORH
V
CCIOPORL
NOTE: There is no timing dependency between the ramp of the VCCIO and the VCC supply voltage; this is just an exemplary drawing.
TMS570LS0432
TMS570LS0332
SPNS186A –OCTOBER 2012–REVISED SEPTEMBER 2013
www.ti.com
4.2.2 Power-Down Sequence
The different supplies to the device can be powered down in any order.
4.2.3 Power-On Reset: nPORRST
This reset must be asserted by an external circuitry whenever the I/O or core supplies are outside the
recommended range. This signal has a glitch filter on it. It also has an internal pulldown.
4.2.3.1 nPORRST Electrical and Timing Requirements
Table 4-4. Electrical Requirements for nPORRST
NO Parameter MIN MAX Unit
V
CCPORL
V
CC
low supply level when nPORRST must be active during power- 0.5 V
up
V
CCPORH
V
CC
high supply level when nPORRST must remain active during 1.14 V
power-up and become active during power down
V
CCIOPORL
V
CCIO
/ V
CCP
low supply level when nPORRST must be active during 1.1 V
power-up
V
CCIOPORH
V
CCIO
/ V
CCP
high supply level when nPORRST must remain active 3.0 V
during power-up and become active during power down
V
IL(PORRST)
Low-level input voltage of nPORRST V
CCIO
> 2.5V 0.2 * V
CCIO
V
Low-level input voltage of nPORRST V
CCIO
< 2.5V 0.5 V
3 t
su(PORRST)
Setup time, nPORRST active before V
CCIO
and V
CCP
> V
CCIOPORL
0 ms
during power-up
6 t
h(PORRST)
Hold time, nPORRST active after V
CC
> V
CCPORH
1 ms
7 t
su(PORRST)
Setup time, nPORRST active before V
CC
< V
CCPORH
during power 2 µs
down
8 t
h(PORRST)
Hold time, nPORRST active after V
CCIO
and V
CCP
> V
CCIOPORH
1 ms
9 t
h(PORRST)
Hold time, nPORRST active after V
CC
< V
CCPORL
0 ms
t
f(nPORRST)
Filter time nPORRST pin; 475 2000 ns
Pulses less than MIN will be filtered out, pulses greater than MAX
will generate a reset.
Figure 4-1. nPORRST Timing Diagram
26 System Information and Electrical Specifications Copyright © 2012–2013, Texas Instruments Incorporated
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