stm706t-s-r STMicroelectronics, stm706t-s-r Datasheet - Page 6

• Manufacturer Part Number: stm706t-s-r
• Description: 3v Supervisor
• Manufacturer: STMicroelectronics

STM706T/S/R; STM706P; STM708T/S/R
Pin Descriptions
MR. A logic low on MR asserts the reset output.
Reset remains asserted as long as MR is low and
for t
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.
WDI. If WDI remains high or low for 1.6sec, the in-
ternal 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 al-
lowing the WDI pin to float.
WDO. WDO goes low when a transition does not
occur on WDI within 1.6sec, and remains low until
a transition occurs on WDI (indicating the watch-
dog interrupt has been serviced). WDO also goes
low when V
ever, unlike the reset output, WDO goes high as
soon as V
Note: For those devices with a WDO output, a
watchdog timeout will not trigger reset unless
WDO is connected to MR.
Table 3. Pin Description
6/26
SO8 TSSOP8 SO8 TSSOP8 SO8 TSSOP8
1
6
8
–
7
2
4
5
3
–
STM706P
rec
after MR returns high. This active-low input
CC
3
8
2
–
1
4
6
7
5
–
CC
exceeds the reset threshold.
falls below the reset threshold; how-
STM706T/S/R
1
6
8
7
–
2
4
5
3
–
Pin
3
8
2
1
–
4
6
7
5
–
STM708T/S/R
1
–
–
7
8
2
4
5
3
6
3
–
–
1
2
4
6
7
5
8
Name
WDO
PFO
RST
RST
WDI
V
V
MR
PFI
NC
CC
SS
RST. Pulses low for t
low whenever V
when MR is a logic low. It remains low for t
either V
watchdog triggers a reset, or MR goes from low to
high.
RST. Pulses high for t
stays high whenever V
threshold or when MR is a logic high. It remains
high for t
threshold, the watchdog triggers a reset, or MR
goes from high to low.
PFI. When PFI is less than V
otherwise, PFO remains high. Connect to ground
if unused.
PFO. When PFI is less than V
otherwise, PFO remains high. Leave open if un-
used.
Push-button Reset Input
Watchdog Input
Watchdog Output
Active-Low Reset Output
Active-High Reset Output
Supply Voltage
PFI Power-fail Input
PFO Power-fail Output
Ground
No Connect
CC
rec
rises above the reset threshold, the
after either V
CC
is below the reset threshold or
Function
rec
when triggered, and stays
rec
CC
CC
when triggered, and
is above the reset
falls below the reset
PFI
PFI
, PFO goes low;
, PFO goes low;
rec
after