STM706 STMicroelectronics, STM706 Datasheet - Page 8

• Manufacturer Part Number: STM706
• Description: 5V Supervisor
• Manufacturer: STMicroelectronics

Specifications of STM706

• Operating Temperature: –40 °C to 85 °C (industrial grade)

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 can be disabled by allowing the WDI pin to float.
WDO
It 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 when triggered, and stays low whenever V
when MR is a logic low. It remains low for t
threshold, or MR goes from low to high.
RST
Goes high with triggered, and stays high whenever V
when MR is a logic high. It stays high for t
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
CC
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 10520 Rev 9
rec
STM705, STM706, STM707, STM708, STM813L
rec
after either V
after either V
CC
CC
is above the reset threshold or
is below the reset threshold or
CC
CC
falls below the reset threshold,
rises above the reset