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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX816 Datasheet

1% Accuracy / Low-Power / +3V and +5V P Supervisory Circuits

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MAX816 pdf
19-0412; Rev 0; 6/95
±1% Accuracy, Low-Power, +3V and +5V
µP Supervisory Circuits
_______________General Description ____________________________Features
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 VCC down to 1V. The reset com-
parator is designed to ignore fast transients on VCC.
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.
_____________________Selector Table
FEATURE
RESET Output
RESET Output
Manual Reset
MAX814 MAX815 MAX816
o ±1% Worst-Case Reset Threshold Accuracy
o 4.8V, 4.7V, 4.55V, 3.03V, or Adjustable Reset
Thresholds
o ±1% Low-Line Threshold Accuracy (MAX814)
60mV Above Reset Threshold
o 200ms Reset Time Delay
o Active-Low RESET Output
Active-High RESET Output (MAX814/MAX816)
o 75µA Max Supply Current
o Guaranteed RESET Valid to VCC = 1V
o Manual Reset Input
o ±2% Power-Fail Comparator
o Independent Watchdog with 1.56sec Timeout
(MAX815)
o Power-Supply Glitch Immunity
o 8-Pin SO and DIP Packages
VCC Reset Voltage
Power-Fail Monitor
Low-Line Detector
Watchdog Circuit
K, L, N, T K, L, N, T Adjustable
_____________Reset Trip Thresholds
SUFFIX
MAX814/MAX815
RESET TRIP THRESHOLD
MIN (V)
MAX (V)
________________________Applications
Medical Equipment
Controllers
Intelligent Instruments
Critical µP Power Monitoring
Portable/Battery-Powered Equipment
Set-Top Boxes
K
4.75
4.85
L
4.65
4.75
N
4.50
4.60
T
3.00
3.06
MAX816
— Adjustable
Ordering Information appears at end of data sheet.
__________________________________________________________Pin Configurations
TOP VIEW
MR 1
VCC 2
GND 3
PFI 4
MAX814
8 RESET
7 RESET
6 LOW LINE
5 PFO
MR 1
VCC 2
GND 3
PFI 4
MAX815
8 WDO
7 RESET
6 WDI
5 PFO
DIP/SO
DIP/SO
MR 1
VCC 2
GND 3
PFI 4
MAX816
8 RESET
7 RESET
6 RESET IN
5 PFO
DIP/SO
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX816 Datasheet

1% Accuracy / Low-Power / +3V and +5V P Supervisory Circuits

No Preview Available !

MAX816 pdf
±1% Accuracy, Low-Power, +3V and +5V
µP Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect GND)
VCC ....................................................................-0.3V to +6.0V
All Other Pins (Note 1)........................... -0.3V to (VCC + 0.3V)
Terminal Current (PFI, RESET IN, MR)................................10mA
Terminal Current (all other pins) .........................................20mA
Continuous Power Dissipation (TA = +25°C)
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C) .........................471mW
Operating Temperature Ranges
Commercial.........................................................0°C to +70°C
Extended ...........................................................-40°C to +85C
Storage Temperature Range .............................-65°C to +125°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS, +5V Parts (MAX814/MAX815K, L, N)
(VCC = 4.85V to 5.5V for MAX814K/MAX815K, VCC = 4.75V to 5.5V for MAX814L/MAX815L, VCC = 4.60V to 5.5V for MAX814N/
MAX815N, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Operating Voltage Range
MAX814_C, MAX815_C
VCC MAX814_E, MAX815_E
1.0 5.5
V
1.2 5.5
Supply Current
MAX814_C, MAX815_C
ISUPPLY
MAX814_E, MAX815_E
75
µA
85
MAX814K, MAX815K
4.75
4.85
Reset Threshold
VRT MAX814L, MAX815L
4.65
4.75
V
MAX814N, MAX815N
4.50
4.60
Reset Threshold Hysteresis
VRT
0 mV
Reset Pulse Width
tRS
140 200 250 ms
RESET Output Voltage
VOH
VOL
MAX814
ISOURCE = 800µA
ISINK = 3.2mA
VCC -1.5
V
0.4
VOH ISOURCE = 800µA
VCC -1.5
RESET, WDO, PFO, LOW LINE
Output Voltage
ISINK = 3.2mA
VOL MAX814_C/MAX815_C, VCC = 1.0V, ISINK = 50µA
0.4
V
0.3
MAX814_E/MAX815_E, VCC = 1.2V, ISINK = 100µA
0.3
Watchdog Timeout Period
tWD MAX815
1.12
2.00 sec
WDI Pulse Width
WDI Input Threshold
tWP
VWDI
MAX815
MAX815, VCC = 5.0V
Low
High
50 ns
0.8
V
2.4
WDI Input Current
IWDI WDI = VCC or WDI = 0V
-1.0 1.0 µA
MR to WDO High Delay
tWDO MAX815 (Note 1)
1 µs
LOW LINE to RESET Differential
Threshold
VLL
MAX814_C, VCC falling
MAX814_E, VCC falling
50 70
mV
48 73
LOW LINE Threshold
VLLT
MAX814K, VCC rising
MAX814L, VCC rising
MAX814N, VCC rising
4.93
4.83
4.68
V
2 _______________________________________________________________________________________


Part Number MAX816
Description 1% Accuracy / Low-Power / +3V and +5V P Supervisory Circuits
Maker Maxim
Total Page 16 Pages
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