STM706T STMICROELECTRONICS [STMicroelectronics], STM706T Datasheet - Page 8

• Manufacturer Part Number: STM706T
• Description: 3 V supervisor
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Pin descriptions
2
2.1
2.2
2.3
Note:
2.4
2.5
2.6
8/33
Pin descriptions
MR
A logic low on MR asserts the reset output. Reset remains asserted as long as MR is low
and for t
driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if
unused.
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 cannot be disabled by allowing the WDI pin to float.
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). WDO also
goes low when V
goes high as soon as V
For those devices with a WDO output, a watchdog timeout will not trigger reset unless WDO
is connected to MR.
RST
Pulses low for t
threshold or when MR is a logic low. It remains low for t
reset threshold, the watchdog triggers a reset, or MR goes from low to high.
RST
Pulses high for t
threshold or when MR is a logic high. It remains high for t
reset threshold, the watchdog triggers a reset, or MR goes from high to low.
PFI
When PFI is less than V
ground if unused.
rec
after MR returns high. This active-low input has an internal pull-up. It can be
rec
rec
CC
when triggered, and stays low whenever V
when triggered, and stays high whenever V
falls below the reset threshold; however, unlike the reset output, WDO
CC
PFI
exceeds the reset threshold. Output type is push-pull.
, PFO goes low; otherwise, PFO remains high. Connect to
Doc ID 10518 Rev 10
STM706T/S/R, STM706P, STM708T/S/R
rec
rec
after either V
after either V
CC
CC
is below the reset
is above the reset
CC
CC
rises above the
falls below the