SPC56EL54X datasheet(134/165 Pages) STMICROELECTRONICS

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Electrical characteristics

SPC56ELx, SPC564Lx

134/165

DocID15457 Rev 12

3.20.5

External watchdog window

If the application design requires the use of an external watchdog the data provided in

Section 3.20

can be used to determine the correct positioning of the trigger window for the

external watchdog. Figure 21 shows the relationships between the minimum and the

maximum duration of a given reset sequence and the position of an external watchdog

trigger window.

Figure 21. Reset sequence - External watchdog trigger window position

3.21

AC timing characteristics

AC Test Timing Conditions: Unless otherwise noted, all test conditions are as follows:



TJ = –40 to 150 °C



Supply voltages as specified in Table 10



Input conditions: All Inputs: tr, tf = 1 ns



Output Loading: All Outputs: 50 pF

3.21.1

RESET pin characteristics

The SPC56ELx/SPC564Lx implements a dedicated bidirectional RESET pin.

External Watchdog Window Closed

Earliest

Application

Start

Latest

Application

Start

Internal Reset Sequence

Start condition (signal or voltage rail)

External Watchdog Window Open

TReset, min

TReset, max

TWDStart, min

TWDStart, max

External Watchdog Window Closed

External Watchdog Window Open

Basic Application Init

Application time required to

prepare watchdog trigger

Watchdog needs to be triggered within this window

Watchdog trigger

Application Running

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