MAX709_05 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Power-Supply Monitor with Reset

19-0136; Rev. 2; 12/05
Power-Supply Monitor with Reset
_______________General Description
The MAX709 provides a system reset during power-up,
power-down, and brownout conditions. When V_CC falls
below the reset threshold, RESET goes low and holds
the µP in reset for 140ms min after V_CC rises above the
threshold.
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.
_______________________Applications
Minimum Component Count,
Low-Cost Processor Systems
__________Typical Operating Circuit
VCC
MAX709
RESET
GND
VCC
µP
RESET
GND
___________________________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 V_CC Transients
♦ 8-Pin DIP, µMAX, and SO Packages
♦ Low Supply Current: 35µA - MAX709R/S/T
65µA - MAX709L/M
______________Ordering Information
PART
MAX709_CPA
MAX709_CUA
MAX709_CSA
MAX709_C/D
MAX709_EPA
MAX709_EUA
MAX709_ESA
TEMP. RANGE
0°C to +70°C
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
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 µMAX
8 SO
Dice
8 Plastic DIP
8 µMAX
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
__________________Pin Configuration
TOP VIEW
N.C. 1
VCC 2
GND 3
N.C. 4
MAX709
8 N.C.
7 RESET
6 N.C.
5 N.C.
DIP/SO/µMAX
________________________________________________________________ Maxim Integrated Products 1
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