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MAX802SCPA Datasheet

  • MAX802SCPA

  • Maxim Integrated Products [3.0V/3.3V Microprocessor Supervi...

  • 102.06KB

  • MAXIM   MAXIM

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3.0V/3.3V Microprocessor Supervisory Circuits
MAX690T/S/R, 704T/S/R, 802T/S/R, 804鈥?06T/S/R
______________________________________________________________Pin Description
PIN
MAX690 MAX704 MAX804
MAX802 MAX806 MAX805
1
2
3
4
5
6
1
2
3
4
5
鈥?/div>
1
2
3
4
5
6
NAME
FUNCTION
Supply Output for CMOS RAM. When V
CC
is above the reset threshold, V
OUT
is
connected to V
CC
through a P-channel MOSFET switch. When V
CC
falls below V
SW
and
VBATT, VBATT connects to V
OUT
. Connect to V
CC
if no battery is used.
Main Supply Input
Ground
鈥?鈥斺€?/div>
鈥?/div>
Power-Fail Input. When PFI is less than V
PFT
or when V
CC
falls below V
SW
, P F O goes
鈥?鈥斺€?/div>
鈥?/div>
low; otherwise, P F O remains high. Connect to ground if unused.
鈥?鈥斺€?/div>
鈥?/div>
Power-Fail Output. When PFI is less than V
PFT
, or V
CC
falls below V
SW
, P F O goes low;
鈥?鈥斺€?/div>
鈥?/div>
otherwise, P F O remains high. Leave open if unused.
Watchdog Input. If WDI remains high or low for 1.6sec, the internal watchdog timer runs out
and reset 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.
鈥撯€?/div>
鈥?/div>
Manual Reset Input. A logic low on M R asserts reset. Reset remains asserted as long as
鈥撯€?/div>
鈥?/div>
鈥撯€?/div>
鈥?/div>
M R is low and for 200ms after M R returns high. This active-low input has an internal
70碌A(chǔ) pull-up current. It can be driven from a TTL or CMOS logic line, or shorted to
ground with a switch. Leave open if unused.
V
OUT
V
CC
GND
PFI
鈥?鈥斺€?/div>
鈥?/div>
PFO
WDI
鈥?/div>
6
鈥?/div>
鈥撯€?/div>
鈥?/div>
MR
7
鈥?/div>
8
7
鈥?/div>
8
鈥?/div>
7
8
Active-Low Reset Output. Pulses low for 200ms when triggered, and stays low whenever
鈥撯€?/div>
鈥?/div>
鈥?鈥?鈥?V
CC
is below the reset threshold or when M R is a logic low. It remains low for 200ms after
鈥斺€斺€?/div>
RESET
鈥撯€?/div>
鈥?/div>
either V
CC
rises above the reset threshold, the watchdog triggers a reset, or M R goes
from low to high.
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
RESET Active-High, Open-Drain Reset Output is the inverse of R E S E T .
VBATT
Backup-Battery Input. When V
CC
falls below V
SW
and VBATT, V
OUT
switches from V
CC
to
VBATT. When V
CC
rises above the reset threshold, V
OUT
reconnects to V
CC
. VBATT may
exceed V
CC
. Connect to V
CC
if no battery is used.
_______________Detailed Description
Reset Output
A microprocessor鈥檚 (碌P鈥檚) reset input starts the 碌P in a
known state. These 碌P supervisory circuits assert reset to
prevent code execution errors during power-up, power-
down, brownout conditions, or a watchdog timeout.
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
R E S E T is guaranteed to be a logic low for 0V < V
CC
<
V
RST
, provided that VBATT is greater than 1V. Without
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
a backup battery, R E S E T is guaranteed valid for V
CC
> 1V. Once V
CC
exceeds the reset threshold, an
鈥?鈥?鈥?/div>
鈥?鈥?鈥?/div>
internal timer keeps R E S E T low for the reset timeout
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
period; after this interval, R E S E T goes high (Figure 2).
If a brownout condition occurs (V
CC
dips below the
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
reset threshold), R E S E T goes low. Each time R E S E T
is asserted, it stays low for the reset timeout period.
Any time V
CC
goes below the reset threshold, the
internal timer restarts.
The watchdog timer can also initiate a reset. See the
Watchdog Input
section.
The MAX804_/MAX805_ active-high RESET output is
open drain, and the inverse of the MAX690_/MAX704_/
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
MAX802_/MAX806_ R E S E T output.
6
Reset Threshold
The MAX690T/MAX704T/MAX805T are intended for
3.3V systems with a 鹵5% power-supply tolerance and a
10% system tolerance. Except for watchdog faults,
reset will not assert as long as the power supply
remains above 3.15V (3.3V - 5%). Reset is guaranteed
to assert before the power supply falls below 3.0V.
The MAX690S/MAX704S/MAX805S are designed for
3.3V 鹵10% power supplies. Except for watchdog
faults, they are guaranteed not to assert reset as long
as the supply remains above 3.0V (3.3V - 10%). Reset
is guaranteed to assert before the power supply falls
below 2.85V (V
CC
- 14%).
The MAX690R/MAX704R/MAX805R are optimized for
monitoring 3.0V 鹵10% power supplies. Reset will not
occur until V
CC
falls below 2.7V (3.0V - 10%), but is
guaranteed to occur before the supply falls below
2.59V (3.0V - 14%).
The MAX802R/S/T, MAX804R/S/T, and MAX806R/S/T
are respectively similar to the MAX690R/S/T,
MAX805R/S/T, and MAX704R/S/T, but with tightened
reset and power-fail threshold tolerances.
_______________________________________________________________________________________

MAX802SCPA PDF文件相關(guān)型號(hào)

MAX802SCSA,MAX804SMJA

MAX802SCPA 產(chǎn)品屬性

  • Maxim Integrated Products

  • 1

  • 1 V to 5.5 V

  • 2.88 V

  • 3.02 V

  • Active Low, Push-Pull

  • Not Resettable

  • Watchdog

  • Backup

  • 200 ms

  • 5.5 V

  • 1 V

  • 50 uA

  • 727 mW

  • + 70 C

  • Through Hole

  • PDIP N

  • 0 C

  • Yes

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