MAX817 Maxim, MAX817 Datasheet
MAX817
Manufacturer Part Number
MAX817
Description
+5V Microprocessor Supervisory Circuits
Manufacturer
Maxim
Datasheet
1.MAX817.pdf
(16 pages)
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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 V
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
19-0494; Rev 1; 3/96
Typical Operating Circuit appears at end of data sheet.
*Patents Pending
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_____________________Selector Guide
_______________General Description
Active-Low Reset
Backup-Battery Switchover
Power-Fail Comparator
Watchdog Input
Battery Freshness Seal
Manual Reset Input
Chip-Enable Gating
Pin-Package
Low-Power, Pin-
Compatible Upgrades for:
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Critical µP Monitoring
Portable Equipment
FEATURE
+5V Microprocessor Supervisory Circuits
________________________________________________________________ Maxim Integrated Products
8-DIP/SO/
MAX690A/
MAX692A
MAX817
µMAX
L/M
—
—
8-DIP/SO/
MAX818
µMAX
L/M
—
—
—
CC
8-DIP/SO/
MAX703/
MAX819
MAX704
µMAX
L/M
. Other
—
—
Ordering Information continued on last page.
†
table below, select the suffix corresponding to the desired
threshold and insert it into the blank to complete the part number.
____________________________Features
These parts offer a choice of reset threshold voltage. From the
_________________Pin Configurations
______________Ordering Information
MAX817_CPA
MAX817_CSA
MAX817_CUA
Pin Configurations continued at end of data sheet.
Precision Supply-Voltage Monitor:
11µA Quiescent Supply Current
200ms Reset Time Delay
Watchdog Timer with 1.6sec Timeout
(MAX817/MAX818)
Battery-Backup Power Switching; Battery Voltage
Can Exceed V
Battery Freshness Seal
On-Board, 3ns Gating of Chip-Enable Signals
(MAX818)
Uncommitted Voltage Monitor for Power-Fail or
Low-Battery Warning (MAX817/MAX819)
Manual Reset Input (MAX819)
TOP VIEW
4.65V (MAX81_L)
4.40V (MAX81_M)
PART
SUFFIX
†
M
L
GND
OUT
V
PFI
CC
CC
1
2
3
4
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
DIP/SO/ MAX
MAX817
RESET THRESHOLD (V)
8
7
6
5
8 Plastic DIP
8 SO
8 µMAX
BATT
RESET
WDI
PFO
PIN-PACKAGE
4.65
4.40
1
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