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UM708LS Datasheet(PDF) 3 Page - Union Semiconductor, Inc.

Part # UM708LS
Description  Supply Voltage Supervisor w/Watchdog Input and Manual Reset
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Manufacturer  UNIONSEMI [Union Semiconductor, Inc.]
Direct Link  http://www.union-ic.com
Logo UNIONSEMI - Union Semiconductor, Inc.

UM708LS Datasheet(HTML) 3 Page - Union Semiconductor, Inc.

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________________________________________________________________________
http://www.union-ic.com Rev.02 May.2014
3/15
UM706xS/UM708xS
Pin Description
Pin
Number
Pin Name
Function
1
MR
_______
Manual-Reset Input triggers a reset pulse when pulled below
0.8V. This active-low input has an internal 250μA pull-up
current. It can be driven from a TTL or CMOS logic line as
well as shorted to ground with a switch.
2
VCC
Supply Input
3
GND
Ground Reference for all signals.
4
PFI
Power-Fail Voltage Monitor Input. When PFI is less than
1.25V, PFO
________
goes low. Connect PFI to GND or VCC when
not used.
5
PFO
________
Power-Fail Output goes low and sinks current when PFI is
less than 1.25V; otherwise PFO
________
stays high.
6
UM706
WDI
Watchdog Input. If WDI remains either high or low for
longer than the watchdog timeout period, the WDO
__________
goes
low. The timer resets with each transition at the WDI input.
Either a high-to-low or a low-to-high transition clears the
counter. The internal timer is also cleared whenever reset is
asserted.
UM708
NC
No Connect
7
RESET
______________
Active-Low Reset Output pulses low for 200ms when
trigged, and stays low whenever VCC is below the reset
threshold. It remains low for 200ms after VCC rises above the
reset threshold or MR
_______
goes from Low to High.
8
UM706
WDO
___________
Watchdog Output pulls low when the internal watchdog timer
finishes its 1.6sec count and does not go high again until the
watchdog is cleared. WDO
___________
also goes low during low-line
conditions. Whenever VCC is below the reset threshold,
WDO
___________
stays low; however, unlike RESET
______________
, WDO
___________
does not
have a minimum pulse width. As soon as VCC rises above the
reset threshold, WDO
___________
goes high with no delay.
UM708
RESET
Active-High Reset Output is the inverse of RESET
____________
.
Whenever RESET is high, RESET
____________
is low, and vice versa.


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