MAX690T_05 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 3.0V/3.3V Microprocessor Supervisory Circuits

19-0243; Rev 2; 12/05
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 the
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
V_OUT ¹
V_CC 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
♦ ^{–R—E—S—E—T–} and RESET Outputs
♦ Manual Reset Input
♦ Precision Supply-Voltage Monitor
♦ 200ms Reset Time Delay
♦ Watchdog Timer (1.6s timeout)
♦ Battery-Backup Power Switching—
Battery Can Exceed V_CC in Normal Operation
♦ 40µA V_CC Supply Current
♦ 1µA Battery Supply Current
♦ Voltage Monitor for Power-Fail or
Low-Battery Warning
♦ Guaranteed ^{–R—E—S—E—T–} Assertion to V_CC = 1V
♦ 8-Pin DIP and SO Packages
______________Ordering Information
PART**
TEMP RANGE
PIN-PACKAGE
MAX690_CPA
0°C to +70°C
8 Plastic DIP
MAX690_CSA
0°C to +70°C
8 SO
MAX690_C/D
0°C to +70°C
Dice*
MAX690_EPA
-40°C to +85°C
8 Plastic DIP
MAX690_ESA
-40°C to +85°C
8 SO
MAX690_MJA
-55°C to +125°C 8 CERDIP
Ordering Information continued at end of data sheet.
*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.
Devices in PDIP and SO packages 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. Lead free
not available for CERDIP package.
_________Typical Operating Circuits
REGULATED +3.3V OR +3.0V
UNREGULATED
DC
0.1μF
R1
R2
3.6V
LITHIUM
BATTERY
V_CC
RESET
(RESET)
PFO
PFI
MAX690T/S/R
MAX802T/S/R
WDI
MAX804T/S/R
MAX805T/S/R
VBATT
V_OUT
GND
0.1μF
0.1μF
V_{CC μP}
RESET
NMI
I/O LINE GND
BUS
V_CC
CMOS RAM
GND
( ) ARE FOR MAX804T/S/R, MAX805T/S/R
See last page for MAX704T/S/R, MAX806T/S/R.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.