MAX814 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – ±1% Accuracy, Low-Power, +3V and +5V μP Supervisory Circuits

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
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