MAX814 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX814 Datasheet PDF : 16 Pages
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±1% Accuracy, Low-Power, +3V and +5V
µP Supervisory Circuits
150µA
1
MR
2
VCC
MAX814
RESET
GENERATOR
60mV
RESET THRESHOLD
4
PFI
POWER- FAIL THRESHOLD
3 GND
Figure 4. MAX814 Block Diagram
2 VCC
150µA
MAX816
1
RESET
MR
GENERATOR
6
RESET IN
1.70V
4
PFI
1.70V
8
RESET
7
RESET
6
LOW LINE
5
PFO
8
RESET
7
RESET
5
PFO
6
WATCHDOG
TRANSITION
WDI
DETECTOR
1 150µA
MR
2
VCC
MAX815
WATCHDOG
TIMER
TIMEBASE
RESET
GENERATOR
8
WDO
7
RESET
RESET THRESHOLD
4
PFI
5
PFO
POWER-FAIL THRESHOLD
3 GND
Figure 5. MAX815 Block Diagram
Reset Output
A µP’s reset input starts the µP in a known state.
Whenever the µP is in an unknown state, it should be
held in reset. The MAX814/MAX815/MAX816 assert reset
during power-up, power-down, or brownout conditions.
On power-up, once VCC reaches 1V, RESET is a guar-
anteed logic low of 0.4V or less. As VCC rises, RESET
stays low. As VCC rises above the reset threshold, an
internal timer releases RESET after 200ms. RESET also
pulses low whenever VCC dips below the reset thresh-
old (i.e., brownout condition). If brownout occurs in the
middle of a previously initiated reset, the internal timer
is reset and the output remains low for at least another
140ms after the brownout ends. On power-down, once
VCC falls below the reset threshold, RESET stays low
and is guaranteed to be less than 0.3V until VCC drops
below 1V.
The MAX814 and MAX816 also offer active-high RESET
outputs. They are the inverse of the RESET outputs.
3 GND
Figure 6. MAX816 Block Diagram
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