SPC56EL70L3 datasheet(108/128 Pages) STMICROELECTRONICS

108 / 128 page

Electrical characteristics

SPC56EL70L3, SPC56EL70L5,PC564L70L3, SPC564L70L5

108/128

DocID023953 Rev 5

3.19.5

External watchdog window

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

Section 3.19: Reset sequence

can be used to determine the correct positioning of the

trigger window for the external watchdog. Figure 20 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 20. Reset sequence - External watchdog trigger window position

3.20

AC timing characteristics

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



• TJ = –40oC to 150oC



• Supply voltages as specified in Table 9



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



• Output Loading: All Outputs: 50 pF

3.20.1

RESET pin characteristics

The SPC56XL70 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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