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PDF MAX690_EPA Data sheet ( Hoja de datos )
| Número de pieza | MAX690_EPA | |
| Descripción | 3.0V/3.3V Microprocessor Supervisory Circuits | |
| Fabricantes | Maxim Integrated | |
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19-0243; Rev 1; 9/94
3.0V/3.3V Microprocessor Supervisory Circuits
_______________General Description
These microprocessor (µP) supervisory circuits reduce
the complexity and number of components required for
power-supply monitoring and battery-control functions
in µP systems. They significantly improve system relia-
bility and accuracy compared to separate ICs or
discrete components.
These devices are designed for use in systems powered
by 3.0V or 3.3V supplies. See the selector guide in the
back of this data sheet for similar devices designed for
5V systems. The suffixes denote different reset threshold
voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see
Reset Threshold section in the Detailed Description). All
these parts are available in 8-pin DIP and SO packages.
Functions offered in this series are as follows:
Part
MAX690
MAX704
MAX802
MAX804
MAX805
MAX806
±4% ±75mV
±4% ±75mV
±2% ±2%
±2% ±2%
±4% ±75mV
±2% ±2%
________________________Applications
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
Portable Equipment
__________________Pin Configuration
TOP VIEW
VOUT 1
VCC 2
GND 3
PFI 4
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
DIP/SO
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
< > ARE FOR MAX704T/S/R, MAX806T/S/R
8 VBATT
7 RESET (RESET)
6 WDI <MR>
5 PFO
____________________________Features
o –R—E—S—E—T– and RESET Outputs
o Manual Reset Input
o Precision Supply-Voltage Monitor
o 200ms Reset Time Delay
o Watchdog Timer (1.6sec timeout)
o Battery-Backup Power Switching—
Battery Can Exceed VCC in Normal Operation
o 40µA VCC Supply Current
o 1µA Battery Supply Current
o Voltage Monitor for Power-Fail or
Low-Battery Warning
o Guaranteed –R—E—S—E—T– Assertion to VCC = 1V
o 8-Pin DIP and SO Packages
______________Ordering Information
PART**
MAX690_CPA
MAX690_CSA
MAX690_C/D
MAX690_EPA
MAX690_ESA
MAX690_MJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
Ordering Information continued on last page.
* Contact factory for dice specifications.
** These parts offer a choice of reset threshold voltage. Select
the letter corresponding to the desired nominal reset threshold
voltage (T = 3.075V, S = 2.925V, R = 2.625V) and insert it into
the blank to complete the part number.
_________Typical Operating Circuits
REGULATED +3.3V OR +3.0V
UNREGULATED
DC
0.1µF
R1
3.6V
R2 LITHIUM
BATTERY
VCC RESET
(RESET)
PFO
PFI
MAX690T/S/R
MAX802T/S/R
WDI
MAX804T/S/R
MAX805T/S/R
VBATT
GND
VOUT
0.1µF
0.1µF
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
See last page for MAX704T/S/R, MAX806T/S/R.
VCC µP
RESET
NMI
I/O LINE GND
BUS
VCC
CMOS RAM
GND
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
1 page  
3.0V/3.3V Microprocessor Supervisory Circuits
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
VCC-to-VOUT ON-RESISTANCE
vs. TEMPERATURE
5
VBATT = 3.0V
4
VCC = 2.5V
VCC = 3.3V
3
2
VCC = 5V
1
0
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
10,000
1000
BATTERY SUPPLY CURRENT
vs. TEMPERATURE
VCC = 0V
PFI = GND
VBATT = 5V
100
10 VBATT = 3V
VBATT-to-VOUT ON-RESISTANCE
vs. TEMPERATURE
180
VCC = 0V
VBATT = 2V
140
VBATT = 3V
100
VBATT = 3.3V
60
VBATT = 5V
20
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
216
212
208
VBATT = 3.0V
204
VCC = 5V
SUPPLY CURRENT
vs. TEMPERATURE
50
VCC = 5V
45
40
VCC = 3.3V
VBATT = 3V
35 PFI = GND
MR/WDI FLOATING
30
VCC = 2.5V
25
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
RESET-COMPARATOR PROPAGATION
DELAY vs. TEMPERATURE
30
VBATT = 3.0V
100mV OVERDRIVE
26
22
18
1 200 14
VBATT = 2V
VCC = 3.3V
0.1
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
196
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
10
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
1.240
PFI THRESHOLD
vs. TEMPERATURE
1.004
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
1.238
VCC = 3.3V
VCC = 5V
1.002
1.236
1.234
VCC = 2.5V
1.000
0.998
1.232
VBATT = 3.0V
1.230
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
0.996
VBATT = 3.0V
0.994
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
3.0V/3.3V Microprocessor Supervisory Circuits
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
VCC
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
RESET
MAX806T/S/R
GND
4.7k
VCC
µP
RESET
GND
Figure 6. Interfacing to µPs with Bidirectional Reset I/O
_Typical Operating Circuits (cont.)
3.0V OR 3.3V
VCC
VBATT
VOUT
0.1µF 3.6V 0.1µF
MAX704T/S/R
MAX806T/S/R
MR RESET
GND PFI
RAM
0.1µF
µP
100
80
VCC = 3.3V
TA = +25°C
60
40
20
0
10
100 1000
RESET COMPARATOR OVERDRIVE (VRST - VCC) (mV)
Figure 7. Maximum Transient Duration without Causing a
Reset Pulse vs. Reset Comparator Overdrive
______________________________________________________________________________________ 11
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| PDF Descargar | [ Datasheet MAX690_EPA.PDF ] | |
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