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MAX820SEJE+T

Description
Supervisory Circuits
Categorysemiconductor    Power management   
File Size337KB,16 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Parametric View All

MAX820SEJE+T Overview

Supervisory Circuits

MAX820SEJE+T Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerMaxim
Product CategorySupervisory Circuits
TypeVoltage Supervisory
Mounting StyleThrough Hole
Package / CaseCDIP-Narrow-16
Threshold Voltage2.75 V to 5.5 V
Number of Inputs Monitored1 Input
Output TypeActive High, Active Low, Push-Pull
Manual ResetManual Reset
Watchdog TimersWatchdog
Battery Backup SwitchingNo Backup
Reset Delay Time280 ms
Supply Voltage - Max5.5 V
Maximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 C
PackagingReel
Height3.3 mm
Length21.34 mm (Max)
Width7.87 mm
Overvoltage Threshold3 V
Undervoltage Threshold2.85 V
Chip Enable SignalsChip Enable
Operating Supply Current150 uA
Pd - Power Dissipation800 mW
Power Fail DetectionYes
Supply Voltage - Min2.75 V
19-0147; Rev. 4; 11/05
Microprocessor and Nonvolatile
Memory Supervisory Circuits
General Description
The MAX792/MAX820 microprocessor (µP) supervisory
circuits provide the most functions for power-supply
and watchdog monitoring in systems without battery
backup. Built-in features include the following:
• µP reset: Assertion of RESET and
RESET
outputs during
power-up, power-down, and brownout conditions.
RESET
is guaranteed valid for V
CC
down to 1V.
• Manual-reset input.
• Two-stage power-fail warning: A separate low-line
comparator compares V
CC
to a preset threshold
120mV above the reset threshold; the low-line and
reset thresholds can be programmed externally.
• Watchdog fault output: Assertion of
WDO
if the watchdog
input is not toggled within a preset timeout
period.
• Pulsed watchdog output: Advance warning of
impending
WDO
assertion from watchdog timeout that
causes hardware shutdown.
• Write protection of CMOS RAM, EEPROM, or other
memory devices.
The MAX792 and MAX820 are identical, except the
MAX820 guarantees higher low-line and reset threshold
accuracy (±2%).
Features
Manual-Reset Input
200ms Power-OK / Reset Time Delay
Independent Watchdog Timer—Preset or Adjustable
On-Board Gating of Chip-Enable Signals
Memory Write-Cycle Completion
10ns (max) Chip-Enable Gate Propagation Delay
Voltage Monitor for Overvoltage Warning
±2% Reset and Low-Line Threshold Accuracy
(MAX820, external programming mode)
MAX792/MAX820
Ordering Information
PART**
MAX792_CPE
MAX792_CSE
MAX792_C/D
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Dice*
Ordering Information continued at end of data sheet.
*
Dice are tested at T
A
= +25°C, DC parameters only.
**These
parts offer a choice of five different reset threshold voltages.
Select the letter corresponding to the desired nominal reset threshold
voltage and insert it into the blank to complete the part number.
Devices in PDIP, SO and µMAX packages are available in both lead-
ed and lead-free packaging. Specify lead free by adding the + sym-
bol at the end of the part number when ordering. Lead free not avail-
able for CERDIP package.
Applications
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
SUFFIX
L
M
T
S
R
RESET THRESHOLD (V)
4.62
4.37
3.06
2.91
2.61
Typical Operating Circuit
3
V
CC
4
CE OUT
RESET IN/INT
13
0.1µF
V
CC
V
CC
µP
MAX792
5
LLIN/
REFOUT
CE IN
OVO
LOW LINE
7
8
OVI
SWT
GND
12
RESET
MR
14
6
10
1
9
GND
NMI
RESET
ADDRESS
DECODER
RAM
A0-A15
________________________________________________________________
Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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