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MAX794EPE+

Description
Supervisory Circuits 3/3.3/AdjV MPU Supervisor
Categorysemiconductor    Power management   
File Size178KB,20 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Environmental Compliance
Download Datasheet Parametric View All

MAX794EPE+ Overview

Supervisory Circuits 3/3.3/AdjV MPU Supervisor

MAX794EPE+ Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerMaxim
Product CategorySupervisory Circuits
RoHSDetails
TypeVoltage Supervisory
Mounting StyleThrough Hole
Package / CasePDIP-16
Threshold Voltage3 V, 3.3 V
Number of Inputs Monitored1 Input
Output TypeActive High, Active Low, Open Drain
Manual ResetManual Reset
Watchdog TimersWatchdog
Battery Backup SwitchingBackup
Reset Delay Time280 ms
Supply Voltage - Max5.5 V
Maximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 C
PackagingTube
Height4.45 mm
Length19.43 mm
Width7.87 mm
Overvoltage ThresholdAdjustable
Undervoltage ThresholdAdjustable
Chip Enable SignalsChip Enable
Operating Supply Current62 uA
Pd - Power Dissipation842 mW
Power Fail DetectionYes
Factory Pack Quantity25
Supply Voltage - Min1.1 V
Unit Weight0.057419 oz
19-0366; Rev 6; 3/10
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
General Description
The MAX793/MAX794/MAX795 microprocessor (µP)
supervisory circuits monitor and control the activities of
+3.0V/+3.3V µPs by providing backup-battery switchover,
among other features such as low-line indication, µP
reset, write protection for CMOS RAM, and a watchdog
(see the
Selector Guide
below). The backup-battery volt-
age can exceed V
CC
, permitting the use of 3.6V lithium
batteries in systems using 3.0V to 3.3V for V
CC
.
The MAX793/MAX795 offer a choice of reset threshold
voltage range (denoted by suffix letter): 3.00V to 3.15V
(T), 2.85V to 3.00V (S), and 2.55V to 2.70V (R). The
MAX794’s reset threshold is set externally with a resistor
divider. The MAX793/MAX794 are available in 16-pin
DIP and narrow SO packages, and the MAX795 comes
in 8-pin DIP and SO packages.
____________________________Features
MAX793/MAX794/MAX795
o
Precision Supply-Voltage Monitor:
Fixed Reset Trip Voltage (MAX793/MAX795)
Adjustable Reset Trip Voltage (MAX794)
o
Guaranteed Reset Assertion to V
CC
= 1V
o
Backup-Battery Power Switching—Battery
Voltage Can Exceed V
CC
o
On-Board Gating of Chip-Enable Signals—7ns
Max Propagation Delay
MAX793/MAX794 Only
o
Battery Freshness Seal
o
Battery OK Output (MAX793)
o
Uncommitted Voltage Monitor for Power-Fail or
Low-Battery Warning
o
Independent Watchdog Timer (1.6s timeout)
o
Manual Reset Input
MAX793/MAX794/MAX795
_____________________Selector Guide
FEATURE
Active-Low Reset
Active-High Reset
Programmable Reset
Threshold
Low-Line Early Warning
Output
Backup-Battery
Switchover
External Switch Driver
Power-Fail Comparator
Battery OK Output
Watchdog Input
Battery Freshness Seal
Manual Reset Input
Chip-Enable Gating
Pin-Package


MAX793


MAX794






MAX795

PART*
MAX793_CPE
MAX793_CSE
Ordering Information
TEMP RANGE
0°C to +70°C
0°C to +70°C
PIN-
PACKAGE
16 Plastic DIP
16 Narrow SO















16-DIP/SO 16-DIP/SO 8-DIP/SO
Ordering Information continued at end of data sheet.
*The
MAX793/MAX795 offer a choice of reset threshold voltage.
Select the letter corresponding to the desired reset threshold
voltage range (T = 3.00V to 3.15V, S = 2.85V to 3.00V, R =
2.55V to 2.70V) and insert it into the blank to complete the part
number. The MAX794’s reset threshold is adjustable.
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.
__________Typical Operating Circuit
3.0V OR 3.3V
0.1µF
PMOS
V
CC
BATT ON OUT
BATT
CE OUT
MAX793
(OPTIONAL)
Si9433DY
SILICONIX
0.1µF
CMOS
RAM
V
CC
CE IN
WDI
LOWLINE
V
CC
ADDRESS
DECODER
A0-A15
I/O
NMI
µP
RESET
________________________Applications
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Controllers
Critical µP Power Monitoring
Portable Equipment
3.6V
0.1µF
WDO
+5V SUPPLY
FAILURE
+5V
MR
PFO
PFI
RESET
BATT OK
GND
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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