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MAX709TCPA

P1-P3P4-P6P7-P8
MAX709
Power-Supply Monitor with Reset
________________________________________________________________ Maxim Integrated Products 1
N.C.
N.C.
RESET
V
CC
N.C.
GND
N.C.
N.C.
1
2
3
4
8
7
6
5
DIP/SO/µMAX
MAX709
__________________Pin Configuration
TOP VIEW
RESET
GND
GND
V
CC
V
CC
µP
MAX709
RESET
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0136; Rev. 2; 12/05
_______________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
___________________________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 TEMP. RANGE PIN-PACKAGE
MAX709_CPA 0°C to +70°C
MAX709_CSA 0°C to +70°C 8 SO
MAX709_C/D 0°C to +70°C Dice
MAX709_EPA -40°C to +85°C 8 Plastic DIP
MAX709_ESA -40°C to +85°C 8 SO
8 Plastic DIP
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 T
A
= +25
°C
,DCparameters 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
MAX709_CUA 0°C to +70°C 8 µMAX
MAX709_EUA -40°C to +85°C 8 µMAX
MAX709
Power-Supply Monitor with Reset
2 _______________________________________________________________________________________
Terminal Voltage (with respect to GND)
V
CC
................................................-0.3V to 6.0V
RESET....................................-0.3V to (V
CC
+ 0.3V)
Input Current, V
CC
..........................................20mA
Output Current, RESET .....................................20mA
Rate-of-Rise, V
CC
.........................................100V/µs
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) ........727mW
µMAX (derate 4.10mW/°C above +70°C) .............330mW
SO (derate 5.88mW/°C above +70°C).................471mW
Operating Temperature Ranges
MAX709_C___ ...................................0°C to +70°C
MAX709_E___ . ................................-40°C to +85°C
Storage Temperature Range ..................-65°C to +160°C
Lead Temperature (soldering, 10sec)....................+300°C
ELECTRICAL CHARACTERISTICS
(V
CC
= full range, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Supply current is measured with V
CC
= 3.6V for MAX709R/S/T, and V
CC
= 5.5V for all versions.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Range
1.0 5.5
V
1.2 5.5
Supply Current (Note 1)
35 85
µA
35 110
All versions
65 150
65 200
RESET Threshold, V
TH
MAX709L 4.50 4.65 4.75
V
MAX709M 4.25 4.40 4.50
MAX709T 3.00 3.08 3.15
MAX709S 2.85 2.93 3.00
MAX709R 2.55 2.63 2.70
V
CC
to RESET Delay V
CC
= reset threshold max to reset threshold min
20 µs
Reset Active Timeout Period
V
CC
= reset threshold max, V
CC
rising
140 280 560 ms
RESET Output Voltage
0.3
V
0.4
I
SINK
= 50µA, V
CC
≥ 1.0V, MAX709_C
0.3
I
SINK
= 100µA, V
CC
≥ 1.2V, MAX709_E
0.4
I
SOURCE
= 800µA, V
CC
≥ reset threshold max,
MAX709L/M only
MAX709_C
MAX709_E
MAX709_C, V
CC
< 3.6V
MAX709_E, V
CC
< 3.6V
MAX709_C, V
CC
< 5.5V
MAX709_E, V
CC
< 5.5V
MAX709R/S/T only
I
SINK
= 1.2mA, V
CC
= reset threshold min,
MAX709R/S/T only
I
SINK
= 3.2mA, V
CC
= reset threshold min,
MAX709L/M only
I
SOURCE
= 500µA, V
CC
≥ reset threshold max,
MAX709R/S/T only
0.8 x V
CC
V
CC
- 1.5
ABSOLUTE MAXIMUM RATINGS
MAX709
Power-Supply Monitor with Reset
_________________________________________________________________________________________________ 3
300
0
-60 100
POWER-UP RESET DELAY
vs. TEMPERATURE
50
250
TEMPERATURE (°C)
POWER-UP RESET DELAY (ms)
60
150
100
-20 20
200
V
CC
= RESET THRESHOLD MAX,
V
CC
RISING
100
20
-60 -20 60 100
SUPPLY CURRENT
vs. TEMPERATURE
40
80
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
20
60
0
NOTE: STEADY-STATE SUPPLY
CURRENT IS INDEPENDENT
OF RESET OUTPUT STATUS
NO LOAD
V
CC
= +5V
V
CC
= +4V
V
CC
= +3V
V
CC
= +2V
V
CC
= +1V
24
0
-60 100
POWER-DOWN RESET DELAY
vs. TEMPERATURE
4
20
TEMPERATURE (°C)
POWER-DOWN RESET DELAY (µs)
60
12
8
-20 20
16
V
CC
STEPPED FROM RESET THRESHOLD
MAX TO RESET THRESHOLD MIN
__________________________________________Typical Operating Characteristics
1.005
0.997
-60 -20 60 100
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
0.999
1.003
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
20
1.001
0.995
THE RESET THRESHOLD IS SHOWN
NORMALIZED TO 1, REPRESENTING
ALL AVAILABLE MAX709 RESET
THRESHOLDS
P1-P3P4-P6P7-P8

MAX709TCPA

Mfr. #:
Buy MAX709TCPA
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits Power-Supply Monitor w/Reset
Lifecycle:
New from this manufacturer.
Delivery:
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