MAX815LESA Maxim Integrated Products, MAX815LESA Datasheet

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MAX815LESA

Manufacturer Part Number
MAX815LESA
Description
+-1% accuracy, low-power, microprocessor supervisory circuit. Reset trip threshold (min) 4.65V (max) 4.75V, push-pull active-low reset output, manual reset, power-fail monitor, watchdog circuit.
Manufacturer
Maxim Integrated Products
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 pack-
ages. See the Selector Table for a review of features.
________________________Applications
19-0412; Rev 1; 12/05
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.
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-
8
7
6
5
K, L, N, T
MAX815
RESET
RESET
LOW LINE
PFO
Adjustable
GND
MAX816
V
MR
PFI
CC
1
2
3
4
CC
.
DIP/SO
MAX815
µP Supervisory Circuits
♦ ±1% Worst-Case Reset Threshold Accuracy
♦ 4.8V, 4.7V, 4.55V, 3.03V, or Adjustable Reset
♦ ±1% Low-Line Threshold Accuracy (MAX814)
♦ 200ms Reset Time Delay
♦ Active-Low RESET Output
♦ 75µA Max Supply Current
♦ Guaranteed RESET Valid to V
♦ Manual Reset Input
♦ ±2% Power-Fail Comparator
♦ Independent Watchdog with 1.56sec Timeout
♦ Power-Supply Glitch Immunity
♦ 8-Pin SO and DIP Packages
Ordering Information continued at end of data sheet.
Reset Trip Thresholds table appears at end of data sheet.
____________________________Features
*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.
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.
______________Ordering Information
MAX814_CPA
Thresholds
60mV Above Reset Threshold
Active-High RESET Output (MAX814/MAX816)
(MAX815)
PART*
8
7
6
5
WDO
RESET
WDI
PFO
GND
V
MR
PFI
CC
TEMP RANGE
0°C to +70°C
1
2
3
4
DIP/SO
MAX816
CC
= 1V
8 PDIP
PIN-PACKAGE
8
7
6
5
RESET
RESET
RESET IN
PFO
1

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MAX815LESA Summary of contents

Page 1

... CC MAX814 GND 3 PFI 4 DIP/SO ________________________________________________________________ Maxim Integrated Products 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. µP Supervisory Circuits ____________________________Features ♦ ±1% Worst-Case Reset Threshold Accuracy ♦ 4.8V, 4.7V, 4.55V, 3.03V, or Adjustable Reset Thresholds ♦ ...

Page 2

Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect GND) V ....................................................................-0.3V to +6.0V CC All Other Pins (Note 1)........................... -0. Terminal Current (PFI, RESET IN, MR)................................10mA Terminal Current (all other ...

Page 3

Accuracy, Low-Power, +3V and +5V ELECTRICAL CHARACTERISTICS, +5V Parts (MAX814/MAX815K (continued 4.85V to 5.5V for MAX814K/MAX815K MAX815N unless otherwise noted.) A MIN MAX PARAMETER SYMBOL MR Pull-Up ...

Page 4

Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits ELECTRICAL CHARACTERISTICS, +3V Parts (MAX814/MAX815T, MAX816) (continued 3.06V to 5.5V for MAX814T/MAX815T and MAX816 PARAMETER SYMBOL WDI Pulse Width t WP WDI Input Threshold V WDI WDI ...

Page 5

Accuracy, Low-Power, +3V and +5V __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE CC 3V PARTS (MAX814T/MAX815T, MAX816 5. 3. ...

Page 6

Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A RESET THRESHOLD DEVIATION vs. TEMPERATURE 3V PARTS (MAX814T/MAX815T, MAX816 -60 -40 - ...

Page 7

Accuracy, Low-Power, +3V and +5V ______________________________________________________________Pin Description PIN MAX814 MAX815 MAX816 — — — — 6 — 6 — — — — ...

Page 8

Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits +3.3V + MAX814K/L/N PFI RESET MR RESET PFO GND Figure 1a. Typical Application for Dual +3.3V and +5V Systems V CC +12V SUPPLY V CC MAX815 RESET PFI WDI ...

Page 9

Accuracy, Low-Power, +3V and +5V MAX814 150µA 1 RESET MR GENERATOR 60mV RESET THRESHOLD 4 PFI POWER- FAIL THRESHOLD 3 GND Figure 4. MAX814 Block Diagram MAX816 150µA 1 RESET MR GENERATOR 6 ...

Page 10

Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits Reset Threshold The MAX814/MAX815 have fixed, factory-set reset thresholds, signified by the first suffix letter in the part number (see Figure 7 for more information on reset ranges). The MAX816 has ...

Page 11

Accuracy, Low-Power, +3V and + greater than or equal to the minimum IC operat- RT ing voltages (V ). The 1% “L” series allows the use ICMIN ±5% power supply, and guarantees system ...

Page 12

Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits WDI WDO RESET RESET 0V Figure 8. MAX815 Watchdog Timing where C is ...

Page 13

Accuracy, Low-Power, +3V and +5V MAX814 MAX815 MAX816 RESET Figure 10. RESET Valid to Ground Circuit Monitoring Voltages Other than V Monitor voltages other than the V voltage divider to PFI and adjusting the ratio appropri- ately. If required, ...

Page 14

Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits + MAX814 MAX815 PFO PFI MAX816 R2 RESET GND V- + +5V PFO TRIP 5 - 2.5 2 TRIP , ...

Page 15

Accuracy, Low-Power, +3V and +5V ______________Ordering Information PART* TEMP. RANGE MAX814_CPA 0°C to +70°C MAX814_CSA 0°C to +70°C MAX814_EPA -40°C to +85°C MAX814_ESA -40°C to +85°C MAX815_CPA 0°C to +70°C MAX815_CSA 0°C to +70°C MAX815_EPA -40°C to +85°C MAX815_ESA ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products ...

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