TMS570LS3134 datasheet(53/167 Pages) TI1

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3.3 V

CCIOPORH

1.2 V

CCPORH

CCIOPORL

(1.2 V)

/ V

(3.3 V)

CCIO

CCP

nPORRST

CCPORL

IL(PORRST)

/ V

CCIO

CCP

CCPORL

IL(PORRST)

CCIOPORH

CCPORH

CCIOPORL

NOTE: There is no timing dependency between the ramp of the VCCIO and the VCC supply voltage; this is just an exemplary drawing.

TMS570LS3134, TMS570LS2134, TMS570LS2124

www.ti.com

SPNS165B – APRIL 2012 – REVISED MAY 2015

6.3.2

Power-Down Sequence

The different supplies to the device can be powered down in any order.

6.3.3

Power-On Reset: nPORRST

This is the power-on reset. This reset must be asserted by an external circuitry whenever the I/O or core

supplies are outside the specified recommended range. This signal has a glitch filter on it. It also has an

internal pulldown.

6.3.3.1

nPORRST Electrical and Timing Requirements

Table 6-4. Electrical Requirements for nPORRST

NO.

PARAMETER

MIN

MAX

UNIT

VCCPORL

VCC low supply level when nPORRST must be active during power up

0.5

VCC high supply level when nPORRST must remain active during power

VCCPORH

1.14

up and become active during power down

VCCIO / VCCP low supply level when nPORRST must be active during

VCCIOPORL

1.1

power up

VCCIO / VCCP high supply level when nPORRST must remain active

VCCIOPORH

3.0

during power up and become active during power down

VIL(PORRST)

Low-level input voltage of nPORRST VCCIO > 2.5V

0.2 * VCCIO

Low-level input voltage of nPORRST VCCIO < 2.5V

0.5

Setup time, nPORRST active before VCCIO and VCCP > VCCIOPORL during

tsu(PORRST)

power up

th(PORRST)

Hold time, nPORRST active after VCC > VCCPORH

tsu(PORRST)

Setup time, nPORRST active before VCC < VCCPORH during power down

µs

th(PORRST)

Hold time, nPORRST active after VCCIO and VCCP > VCCIOPORH

th(PORRST)

Hold time, nPORRST active after VCC < VCCPORL

Filter time nPORRST pin;

tf(nPORRST)

500

2000

pulses less than MIN will be filtered out, pulses greater than MAX will

generate a reset.

Figure 6-1. nPORRST Timing Diagram

System Information and Electrical Specifications

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