MAX817 Datasheet PDF - Maxim Integrated
| Part Number | MAX817 | |
| Description | +5V Microprocessor Supervisory Circuits | |
| Manufacturers | Maxim Integrated | |
| Logo |  |
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19-0494; Rev 1; 3/96
+5V Microprocessor Supervisory Circuits
_______________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.
_____________________Selector Guide
FEATURE
MAX817 MAX818 MAX819
L/M L/M L/M
Active-Low Reset
Backup-Battery Switchover
Power-Fail Comparator
—
Watchdog Input
—
Battery Freshness Seal
Manual Reset Input
——
Chip-Enable Gating
—
—
Pin-Package
8-DIP/SO/ 8-DIP/SO/ 8-DIP/SO/
µMAX µMAX µMAX
Low-Power, Pin-
MAX690A/
Compatible Upgrades for: MAX692A
—
MAX703/
MAX704
________________________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)
______________Ordering Information
PART†
TEMP. RANGE PIN-PACKAGE
MAX817_CPA
0°C to +70°C
8 Plastic DIP
MAX817_CSA
0°C to +70°C
8 SO
MAX817_CUA
0°C to +70°C
8 µMAX
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.
SUFFIX
L
M
RESET THRESHOLD (V)
4.65
4.40
_________________Pin Configurations
TOP VIEW
OUT 1
VCC 2
GND 3
PFI 4
MAX817
8 BATT
7 RESET
6 WDI
5 PFO
Typical Operating Circuit appears at end of data sheet.
*Patents Pending
DIP/SO/µMAX
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
|
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+5V Microprocessor Supervisory Circuits
__________________________________________Typical Operating Characteristics
(VCC = +5V, VBATT = 3.0V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE (NO LOAD)
16
14
12
10
8
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
BATT TO OUT ON-RESISTANCE
vs. TEMPERATURE
300
VCC = 0V
250
VBATT = 2.0V
200
150 VBATT = 2.8V
100 VBATT = 5.0V
50
0
-40 -20
0 20 40 60 80 100
TEMPERATURE (°C)
VCC TO RESET PROPAGATION DELAY
vs. TEMPERATURE
500
VCC FALLING AT:
0.25V/ms
400
300
1V/ms
200
10V/ms
100
BATTERY SUPPLY CURRENT
(BACKUP MODE) vs. TEMPERATURE
160
VCC = 0V
140
VBATT = 5.0V
120
100
80 VBATT = 2.8V
60 VBATT = 2.0V
40
20
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
VCC TO OUT ON-RESISTANCE
vs. TEMPERATURE
7
CE IN TO CE OUT ON-RESISTANCE
vs. TEMPERATURE
100
90
VCE IN = 4V
80
70
60
VCE IN = 3V
50
40 VCE IN = 2V
30
20
10
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
RESET TIMEOUT PERIOD
vs. TEMPERATURE
220
6 210
5 200
4 190
3
-40 -20
0 20 40 60 80 100
TEMPERATURE (°C)
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
1.70
180
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
BATTERY FRESHNESS SEAL
LEAKAGE CURRENT vs. TEMPERATURE
20
1.65 15
1.60 10
1.55 5
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
1.50
-40 -20
0 20 40 60 80 100
TEMPERATURE (°C)
0
-40 -20
0 20 40 60 80 100
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for MAX817 electronic component. |
| Information | Total 16 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ MAX817.PDF Datasheet ] | |
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