19-0136; Rev. 2; 12/05
Power-Supply Monitor with Reset
The RESET output is guaranteed to be in the correct
state with V CC down to 1V. The MAX709 provides
excellent circuit reliability and low cost by eliminating
external components and adjustments when used with
+5V, +3.3V, or +3V powered systems. The MAX709 is
available 8-pin DIP, µMAX, and SO packages.
___________________________Features
♦ +5V, +3.3V, and +3V Versions
♦ No External Components
♦ Low Cost
♦ Precise Power-Down Reset Threshold
♦ 140ms Min Power-On Reset Delay
♦ Immune to Short Negative VCC Transients
♦ 8-Pin DIP, µMAX, and SO Packages
♦ Low Supply Current: 35µA - MAX709R/S/T
65µA - MAX709L/M
______________Ordering Information
PART
TEMP. RANGE
MAX709_CPA
PIN-PACKAGE
0°C to +70°C
8 Plastic DIP
MAX709_CUA
0°C to +70°C
8 µMAX
MAX709_CSA
0°C to +70°C
8 SO
MAX709_C/D
0°C to +70°C
Dice
Minimum Component Count,
Low-Cost Processor Systems
MAX709_EPA
-40°C to +85°C
MAX709_EUA
_______________________Applications
-40°C to +85°C
8 Plastic DIP
8 µMAX
MAX709_ESA
-40°C to +85°C
8 SO
Devices 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.
*Dice are specified at TA = +25°C, DC parameters only.
Note: This part offers a choice of five different reset threshold
voltages. Select the letter corresponding to the desired
nominal reset threshold voltage, and insert it into the
blank to complete the part number.
RESET THRESHOLD
SUFFIX
VOLTAGE (V)
L
4.65
M
4.40
T
3.08
S
2.93
R
2.63
__________Typical Operating Circuit
VCC
VCC
µP
MAX709
__________________Pin Configuration
TOP VIEW
8
N.C.
7
RESET
3
6
N.C.
N.C.
GND
1
2
GND
RESET
N.C.
VCC
RESET
4
5
N.C.
GND
MAX709
DIP/SO/µMAX
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
MAX709
_______________General Description
The MAX709 provides a system reset during power-up,
power-down, and brownout conditions. When VCC falls
below the reset threshold, RESET goes low and holds
the µP in reset for 140ms min after VCC rises above the
threshold.
