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Part: MAX709L/M
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX709L, MAX709M, MAX709R, MAX709S, MAX709T Power Supply Monitor With 4.65V Reset Threshold
Company: Maxim Integrated Products
Datasheet: Download MAX709L/M datasheet File size : 6567 kB
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Datasheet text preview:
19-0136; Rev. 1; 6/94
Power-Supply Monitor with Reset
_______________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. The RESET output is guaranteed to be in the correct s t a t e with V CC d o w n 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
o +5V, +3.3V, and +3V Versions o No External Components o Low Cost o Precise Power-Down Reset Threshold o 140ms Min Power-On Reset Delay o Immune to Short Negative VCC Transients o 8-Pin DIP, µMAX, and SO Packages o Low Supply Current: 35µA - MAX709R/S/T 65µA - MAX709L/M
MAX709
______________Ordering Information
PART MAX709_CPA MAX709_CUA MAX709_CSA MAX709_C/D 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
_______________________Applications
Minimum Component Count, Low-Cost Processor Systems
MAX709_EPA MAX709_EUA MAX709_ESA
* 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 L M T S R VOLTAGE (V) 4.65 4.40 3.08 2.93 2.63
__________Typical Operating Circuit
__________________Pin Configuration
VCC VCC µP RESET VCC GND GND GND N.C.
TOP VIEW
N.C.
MAX709
RESET
1 2 3 4
DIP/SO/µMAX
8
MAX709
N.C. RESET N.C. N.C.
7 6 5
________________________________________________________________ Maxim Integrated Products
1
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Power-Supply Monitor with Reset MAX709
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V) Input Current, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Output Current, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Rate-of-Rise, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V/µs Continuous Power Dissipation (TA = +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
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.
ELECTRICAL CHARACTERISTICS
(VCC = full range, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER VCC Range MAX709_C MAX709_E MAX709R/S/T only Supply Current (Note 1) All versions MAX709L MAX709M RESET Threshold, VTH MAX709T MAX709S MAX709R VCC to RESET Delay Reset Active Timeout Period VCC = reset threshold max to reset threshold min VCC = reset threshold max, VCC rising ISINK = 1.2mA, VCC = reset threshold min, MAX709R/S/T only ISINK = 3.2mA, VCC = reset threshold min, MAX709L/M only RESET Output Voltage ISINK = 50µA, VCC 1.0V, MAX709_C ISINK = 100µA, VCC 1.2V, MAX709_E ISOURCE = 500µA, VCC reset threshold max, MAX709R/S/T only ISOURCE = 800µA, VCC reset threshold max, MAX709L/M only 0.8 x VCC VCC - 1.5 140 MAX709_C, VCC < 3.6V MAX709_E, VCC < 3.6V MAX709_C, VCC < 5.5V MAX709_E, VCC < 5.5V 4.50 4.25 3.00 2.85 2.55 CONDITIONS MIN 1.0 1.2 35 35 65 65 4.65 4.40 3.08 2.93 2.63 20 280 560 0.3 0.4 0.3 0.4 V TYP MAX 5.5 5.5 85 110 150 200 4.75 4.50 3.15 3.00 2.70 µs ms V µA UNITS V
Note 1: Supply current is measured with VCC = 3.6V for MAX709R/S/T, and VCC = 5.5V for all versions. 2 _______________________________________________________________________________________
Power-Supply Monitor with Reset
__________________________________________Typical Operating Characteristics
MAX709
POWER-UP RESET DELAY vs. TEMPERATURE
300 250 200 150 100 50 0 -60 -20 20 60 100 TEMPERATURE (°C) POWER-DOWN RESET DELAY (µs) POWER-UP RESET DELAY (ms) VCC = RESET THRESHOLD MAX, CC RISING 24 20 16 12 8 4 0 -60
POWER-DOWN RESET DELAY vs. TEMPERATURE
VCC STEPPED FROM RESET THRESHOLD MAX TO RESET THRESHOLD MIN -20 20 60 100
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
100 NORMALIZED RESET THRESHOLD NOTE: STEADY-STATE SUPPLY CURRENT IS INDEPENDENT OF RESET OUTPUT STATUS NO LOAD 60 VCC = +5V VCC = +4V 40 VCC = +3V 20 0 VCC = +2V VCC = +1V -60 -20 20 60 100 TEMPERATURE (°C) 1.005
NORMALIZED RESET THRESHOLD vs. TEMPERATURE
N THE RESET THRESHOLD IS SHOWN A ORMALIZED TO 1, REPRESENTING LL AVAILABLE MAX709 RESET THRESHOLDS
SUPPLY CURRENT (µA)
80
1.003
1.001
0.999
0.997 0.995 -60 -20 20 60 100 TEMPERATURE (°C)
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