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MAX817L Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX817L
Description  5V Microprocessor Supervisory Circuits
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX817L Datasheet(HTML) 1 Page - Maxim Integrated Products

 
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_______________General Description
The MAX817/MAX818/MAX819 microprocessor (µP)
supervisory circuits simplify power-supply monitoring,
battery control, and chip-enable gating in µP systems
by reducing the number of components required.
These devices are designed for use in +5V-powered
systems. Low supply current (11µA typical) and small
package size make these devices ideal for portable
applications. The MAX817/MAX818/MAX819 are specif-
ically designed to ignore fast transients on VCC. Other
supervisory functions include active-low reset, backup-
battery switchover, watchdog input, battery freshness
seal, and chip-enable gating. The
Selector Guide below
lists the specific functions available from each device.
These devices offer two pretrimmed reset threshold volt-
ages for ±5% or ±10% power supplies: 4.65V for the L
versions and 4.40V for the M versions. The MAX817/
MAX818/MAX819 are available in space-saving µMAX
packages, as well as 8-pin DIP/SO.
________________________Applications
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Critical µP Monitoring
Portable Equipment
____________________________Features
o Precision Supply-Voltage Monitor:
4.65V (MAX81_L)
4.40V (MAX81_M)
o 11µA Quiescent Supply Current
o 200ms Reset Time Delay
o Watchdog Timer with 1.6sec Timeout
(MAX817/MAX818)
o Battery-Backup Power Switching; Battery Voltage
Can Exceed VCC
o Battery Freshness Seal
o On-Board, 3ns Gating of Chip-Enable Signals
(MAX818)
o Uncommitted Voltage Monitor for Power-Fail or
Low-Battery Warning (MAX817/MAX819)
o Manual Reset Input (MAX819)
+5V Microprocessor Supervisory Circuits
________________________________________________________________
Maxim Integrated Products
1
WDI
GND
PFO
PFI
1
2
8
7
BATT
RESET
VCC
OUT
MAX817
DIP/SO/
µMAX
TOP VIEW
3
4
6
5
_________________Pin Configurations
19-0494; Rev 1; 3/96
PART
MAX817_CPA
MAX817_CSA
MAX817_CUA
0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
8 Plastic DIP
8 SO
8 µMAX
______________Ordering Information
_____________________Selector Guide
Ordering Information continued on last page.
These parts offer a choice of reset threshold voltage. From the
table below, select the suffix corresponding to the desired
threshold and insert it into the blank to complete the part number.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
SUFFIX
RESET THRESHOLD (V)
L
4.65
M
4.40
FEATURE
MAX817
L/M
Active-Low Reset
Backup-Battery Switchover
MAX818
L/M
MAX819
L/M
Power-Fail Comparator
Watchdog Input
Battery Freshness Seal
Manual Reset Input
Chip-Enable Gating
Pin-Package
8-DIP/SO/
µMAX
8-DIP/SO/
µMAX
8-DIP/SO/
µMAX
Low-Power, Pin-
Compatible Upgrades for:
MAX690A/
MAX692A
MAX703/
MAX704
Typical Operating Circuit appears at end of data sheet.
Pin Configurations continued at end of data sheet.
*Patents Pending


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