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IMP706SCSA Datasheet(PDF) 6 Page - IMP, Inc

Part # IMP706SCSA
Description  3/3.3/4.0V 關P SUPERVISOR CIRCUITS
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Manufacturer  IMP [IMP, Inc]
Direct Link  http://www.ds-imp.com.cn/index.asp
Logo IMP - IMP, Inc

IMP706SCSA Datasheet(HTML) 6 Page - IMP, Inc

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RESET/RESET Operation
The RESET/RESET signals are designed to start or return a
µP/µC to a known state.
With VCC above 1.2V, RESET and RESET are guaranteed to be
asserted. During a power-up sequence, the reset outputs remain
asserted until the supply rises above the threshold level. The
resets are deasserted approximately 200ms after crossing the
threshold.
In a brownout situation where VCC falls below the threshold level,
the reset outputs are asserted. If a brownout occurs during an
already initiated reset period, the reset period will extend for an
additional reset period of 200ms.
The IMP708 devices have dual reset outputs, one active LOW and
one active HIGH. The IMP706P has a single active HIGH reset and
the IMP706/R/S/T/J devices have an active LOW reset output.
IMP Part
RESET Polarity Threshold Watchdog Timer
IMP706P
HIGH
2.63V
Yes
IMP706R
LOW
2.63V
Yes
IMP706S
LOW
2.93V
Yes
IMP706T
LOW
3.08V
Yes
IMP706J
LOW
4.00V
Yes
IMP708R
Both: HIGH & LOW
2.63V
No
IMP708S
Both: HIGH & LOW
2.93V
No
IMP708T
Both: HIGH & LOW
3.08V
No
IMP708J
Both: HIGH & LOW
4.00V
No
Manual Reset (MR)
The active-LOW manual reset input is pulled high by an internal
20k
Ω pull-up resistor and can be driven low by CMOS/TTL logic
or a mechanical switch to ground. An external debounce circuit is
unnecessary since the 140ms minimum reset time will debounce
mechanical pushbutton switches. The minimum MR input pulse
IMP706P/R/S/T/J, IMP708R/S/T/J
IMP706P/R/S/T/J, IMP708R/S/T/J
6
408-432-9100/www.impweb.com
©
1999 IMP, Inc.
5V
0V
5V
0V
5V
0V
5V
0V
VCC
v
RT
WDO
RESET
MR
t
MD
t
RS
t
RS
t
MR
MR externally
set low
706P_05.eps
Watchdog Timing
WDI Three-state operation
5V
0V
5V
t
WD
t
WP
t
WD
t
WD
0V
5V
0V
RESET triggered by MR
WDI
WDO
RESET
706P_04.eps
width is 0.5
µs with a 3V VCC input and 0.15µs with a 5V VCC
input. If not used, tie MR to VCC or leave floating.
By connecting the watchdog output (WDO) and MR, a watchdog
timeout forces a RESET to be generated.
Watchdog Timer
A watchdog timer available on the IMP706P/R/S/T/J monitors
µP/µC activity. If activity is not detected within 1.6 seconds on the
Watchdog Input (WDI), the internal timer puts the Watchdog
Output (WDO) into a LOW state. WDO will remain LOW until
activity is detected at WDI.
The watchdog function is disabled, meaning it is cleared and not
counting, if WDI is floated or connected to a three-stated circuit.
The watchdog timer is also disabled if RESET is asserted. When
RESET becomes inactive and the WDI input sees a high or low
transition as short as 100ns (VCC = 2.7V)/50ns (VCC = 4.5V), the
watchdog timer will begin a 1.6 second countdown. Additional
transitions at WDI will reset the watchdog timer and initiate a
new countdown sequence.
WDO will also become LOW and remain so, whenever the supply
voltage, VCC, falls below the device threshold level. WDO goes HIGH
as soon as VCC transitions above the threshold. There is no minimum
pulse width for WDO as there is for the RESET outputs. If WDI is float-
ed, WDO essentially acts as a low supply voltage output indicator.
Power-failure detection with auxiliary comparator
All devices have an auxiliary comparator with 1.25V trip point.
The output, PFO, is active LOW and the noninverting input is PFI.
This comparator can be used as a supply voltage monitor with an
external resistor voltage divider. As the monitored voltage level
falls, PFI is reduced causing the PFO output to go LOW.
Normally PFO interrupts the processor so the system can be shut
down in a controlled manner.
Detail Descriptions


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