MAX814KCSA Datasheet, PDF (1/16 Pages) Maxim Integrated Products – +1,-1% Accuracy, Low-Power, +3V and +5V muP Supervisory Circuits

19-0412; Rev 1; 12/05
±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 V_CC down to 1V. The reset com-
parator is designed to ignore fast transients on V_CC.
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 pack-
ages. See the Selector Table for a review of features.
♦ ±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_CC = 1V
♦ Manual Reset Input
♦ ±2% Power-Fail Comparator
_____________________Selector Table
♦ Independent Watchdog with 1.56sec Timeout
(MAX815)
FEATURE
MAX814 MAX815 MAX816
♦ Power-Supply Glitch Immunity
RESET Output
✔
✔
✔
♦ 8-Pin SO and DIP Packages
RESET Output
✔
✔
Manual Reset
✔
✔
✔
______________Ordering Information
V_CC Reset Voltage
Power-Fail Monitor
Low-Line Detector
K, L, N, T
✔
✔
K, L, N, T Adjustable
✔
✔
PART*
MAX814_CPA
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
8 PDIP
Watchdog Circuit
✔
________________________Applications
*The MAX814/MAX815 offer a choice of reset threshold voltages.
From the Reset Trip Threshold table, select the suffix corre-
sponding to the desired threshold and insert it into the blank to
complete the part number.
Medical Equipment
Controllers
Intelligent Instruments
Devices are available in both leaded and lead-free packaging.
Specify lead free by adding the + symbol at the end of the part
number when ordering.
Critical µP Power Monitoring
Portable/Battery-Powered Equipment
Set-Top Boxes
Ordering Information continued at end of data sheet.
Reset Trip Thresholds table appears at end of data sheet.
__________________________________________________________Pin Configurations
TOP VIEW
MR 1
V_CC 2
GND 3
PFI 4
MAX814
8 RESET
7 RESET
6 LOW LINE
5 PFO
MR 1
V_CC 2
GND 3
PFI 4
MAX815
8 WDO
7 RESET
6 WDI
5 PFO
DIP/SO
DIP/SO
MR 1
V_CC 2
GND 3
PFI 4
MAX816
8 RESET
7 RESET
6 RESET IN
5 PFO
DIP/SO
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.