MAX814 Maxim, MAX814 Datasheet

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MAX814

Manufacturer Part Number
MAX814
Description
1% Accuracy / Low-Power / +3V and +5V P Supervisory Circuits
Manufacturer
Maxim
Datasheet

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The MAX814/MAX815/MAX816 are high-accuracy
microprocessor (µP) supervisory circuits that provide
power-on reset, watchdog, and power-fail functions.
They eliminate manual trimming and improve reliability
in critical applications needing high-accuracy reset
thresholds. The RESET output is guaranteed to be in
the correct state for V
parator is designed to ignore fast transients on V
Reset thresholds are available for operation with a vari-
ety of 3V and 5V supply voltages.
A 75µA maximum supply current makes the MAX814/
MAX815/MAX816 ideal for use in portable equipment.
All three devices are available in 8-pin DIP and SO
packages. See the Selector Table below for a review of
features.
________________________Applications
19-0412; Rev 0; 6/95
Call toll free 1-800-998-8800 for free samples or literature.
RESET Output
RESET Output
Manual Reset
V
Power-Fail Monitor
Low-Line Detector
Watchdog Circuit
_______________General Description
_____________________Selector Table
__________________________________________________________Pin Configurations
CC
Reset Voltage
FEATURE
TOP VIEW
Medical Equipment
Controllers
Intelligent Instruments
Critical µP Power Monitoring
Portable/Battery-Powered Equipment
Set-Top Boxes
GND
V
MR
PFI
CC
1
2
3
4
________________________________________________________________ Maxim Integrated Products
±1% Accuracy, Low-Power, +3V and +5V
K, L, N, T
MAX814
DIP/SO
CC
MAX814
down to 1V. The reset com-
K, L, N, T
8
7
6
5
MAX815
RESET
RESET
LOW LINE
PFO
Adjustable
GND
V
MAX816
MR
PFI
CC
1
2
3
4
CC
.
DIP/SO
MAX815
µP Supervisory Circuits
____________________________Features
Ordering Information appears at end of data sheet.
_____________Reset Trip Thresholds
±1% Worst-Case Reset Threshold Accuracy
4.8V, 4.7V, 4.55V, 3.03V, or Adjustable Reset
Thresholds
±1% Low-Line Threshold Accuracy (MAX814)
60mV Above Reset Threshold
200ms Reset Time Delay
Active-Low RESET Output
Active-High RESET Output (MAX814/MAX816)
75µA Max Supply Current
Guaranteed RESET Valid to V
Manual Reset Input
±2% Power-Fail Comparator
Independent Watchdog with 1.56sec Timeout
(MAX815)
Power-Supply Glitch Immunity
8-Pin SO and DIP Packages
8
7
6
5
SUFFIX
WDO
RESET
WDI
PFO
K
N
L
T
GND
V
MR
PFI
CC
MAX814/MAX815
1
2
3
4
MAX816
MIN (V)
RESET TRIP THRESHOLD
4.75
4.65
4.50
3.00
DIP/SO
MAX816
Adjustable
CC
= 1V
8
7
6
5
RESET
RESET
RESET IN
PFO
MAX (V)
4.85
4.75
4.60
3.06
1

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