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STM706T 数据表(PDF) 8 Page - STMicroelectronics

部件名 STM706T
功能描述  3 V supervisor
Download  32 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STM706T 数据表(HTML) 8 Page - STMicroelectronics

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Pin descriptions
STM706T/S/R, STM706P, STM708T/S/R
8/32
Doc ID 10518 Rev 12
2
Pin descriptions
2.1
MR
A logic low on MR asserts the reset output. Reset remains asserted as long as MR is low
and for trec after MR returns high. This active low input has an internal pull-up. It can be
driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if
unused.
2.2
WDI
If WDI remains high or low for 1.6 s, the internal watchdog timer runs out and reset (or
WDO) is triggered. The internal watchdog timer clears while reset is asserted or when WDI
sees a rising or falling edge.
The watchdog function can be disabled by allowing the WDI pin to float.
2.3
WDO
WDO goes low when a transition does not occur on WDI within 1.6 s, and remains low until
a transition occurs on WDI (indicating the watchdog interrupt has been serviced) or MR
input is asserted (goes low). WDO also goes low when VCC falls below the reset threshold;
however, unlike the reset output, WDO goes high as soon as VCC exceeds the reset
threshold. Output type is push-pull.
Note:
For those devices with a WDO output, a watchdog timeout will not trigger reset unless WDO
is connected to MR.
2.4
RST
Pulses low for trec when triggered, and stays low whenever VCC is below the reset
threshold or when MR is a logic low. It remains low for trec after either VCC rises above the
reset threshold, the watchdog triggers a reset, or MR goes from low to high.
2.5
RST
Pulses high for trec when triggered, and stays high whenever VCC is above the reset
threshold or when MR is a logic high. It remains high for trec after either VCC falls below the
reset threshold, the watchdog triggers a reset, or MR goes from high to low.
2.6
PFI
When PFI is less than VPFI, PFO goes low; otherwise, PFO remains high. Connect to
ground if unused.


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