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Part: MAX6315-39
Category:
Analog & Mixed-Signal Processing
-> Power
Description: Open-drain Sot P Reset Circuit
Company: Maxim Integrated Products
Datasheet: Download MAX6315-39 datasheet File size : 384 kB
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Datasheet text preview:
19-2000; Rev 2; 1/00
Open-Drain SOT µP Reset Circuit
________________General Description
The MAX6315 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. It provides excellent circ u i t reliability and low cost by eliminating external components and adjustments. The MAX6315 also provides a debounced manual reset input. This device performs a single function: it asserts a reset signal whenever the VCC supply voltage falls below a preset threshold or whenever manual reset is asserted. Reset remains asserted for an internally programmed interval (reset timeout period) after VCC has risen above the reset threshold or manual reset is deasserted. The MAX6315's open-drain RESET output can be pulled up to a voltage higher than VCC. The MAX6315 comes with factory-trimmed reset thresho l d voltages in 100mV increments from 2.5V to 5V. P r e s e t timeout periods of 1ms, 20ms, 140ms, and 1120ms (min) are also available. The device comes in a SOT143 package. For microcontrollers (µCs) and µPs with bidirectional reset pins, see the MAX6314 data sheet.
____________________________Features
o Small SOT143 Package o Open-Drain RESET Output Can Exceed VCC o Precision, Factory-Set VCC Reset Thresholds: 100mV Increments from 2.5V to 5V o Four Reset Timeout Periods Available: 1ms, 20ms, 140ms, or 1120ms (minimum) o Immune to Short VCC Transients o 5µA Supply Current o Pin-Compatible with MAX811 o Guaranteed Over Temperature
MAX6315
________________________Applications
Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment
Ordering and Marking Information appear at end of data sheet.
__________Typical Operating Circuit
VCC
__________________Pin Configuration
VCC LASERTRIMMED RESISTORS
TOP VIEW
GND 1 4 VCC µP
MAX6315
MR RESET CIRCUITRY
RESET
RESET
RESET
2
3
MR
MAX6315 GND
SOT143
________________________________________________________________ Maxim Integrated Products
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For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Open-Drain SOT µP Reset Circuit MAX6315
ABSOLUTE MAXIMUM RATINGS
VCC ......-0.3V to +6.0V RESET...........-0.3V to +6.0V All Other Pins....-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) SOT143 (derate 4mW/°C above +70°C) ......320mW Operating Temperature Range .......-40°C to +125°C Storage Temperature Range .....-65°C to +160°C Lead Temperature (soldering, 10s) .........+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 = +2.5V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Operating Voltage Range SYMBOL VCC CONDITIONS MIN TYP 5 4 VTH MAX 5.5 12 15 10 12 VTH + 1.8% VTH + 2.5% VTH + 3.5% UNITS V TA = -40°C to +85°C 1.0 VCC = 5.5V, no load (-40°C to +85°C) VCC = 5.5V, no load (-40°C to +125°C) VCC = 3.6V, no load (-40°C to +85°C) VCC = 3.6V, no load (-40°C to +125°C) TA = +25°C VTH - 1.8% TA = -40°C to +85°C VTH - 2.5% TA = -40°C to +125°C VTH - 3.5% VCC = falling at 1mV/µs MAX6315US_ _D1-T (-40°C to +85°C) MAX6315US_ _D1-T (-40°C to +125°C) MAX6315US_ _D2-T (-40°C to +85°C) MAX6315US_ _D2-T (-40°C to +125°C) MAX6315US_ _D3-T (-40°C to +85°C) MAX6315US_ _D3-T (-40°C to +125°C) MAX6315US_ _D4-T (-40°C to +85°C) MAX6315US_ _D4-T (-40°C to +125°C)
VCC Supply Current
ICC
µA
Reset Threshold (Note 1) Reset Threshold Tempco VCC to Reset Delay
VTH VTH/°C
V ppm/°C µs
Reset Timeout Period
tRP
1 0.8 20 16 140 112 1120 896 0.8
60 35 1.4 28 200 1570
2 2.4 40 48 280 336 2240 2688
ms
MANUAL RESET INPUT MR Input Threshold MR Minimum Input Pulse MR Glitch Rejection MR to Reset Delay MR Pull-Up Resistance VCC > 4.25V, ISINK = 3.2mA RESET Output Voltage VOL VCC > 2.5V, ISINK = 1.2mA VCC > 1.2V, ISINK = 0.5mA VCC > 1.0V, ISINK = 80µA RESET Output Leakage Current VCC > VTH, RESET deasserted 0.3 1 µA 32 VIL VIH VIL VIH VTH > 4.0V VTH < 4.0V 2.4 0.3 x VCC 0.7 x VCC 1 100 500 63 100 0.4 0.3 V µs ns ns k V
Note 1: The MAX6315 monitors VCC through an internal factory-trimmed voltage divider that programs the nominal reset threshold. Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see Ordering Information).
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_______________________________________________________________________________________
Open-Drain SOT µP Reset Circuit
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6315-01 MAX6315-02
MAX6315
SUPPLY CURRENT vs. TEMPERATURE
6 5 SUPPLY CURRENT (µA) 4 3 VCC = 3V 2 1 0 -50 -30 -10 10 30 50 70 90 TEMPERATURE (°C) VCC = 1V VCC = 5V 6 5 SUPPLY CURRENT (µA) 4 3
POWER-DOWN RESET DELAY vs. TEMPERATURE
VCC FALLING AT 1mV/µs POWER-DOWN RESET DELAY (µs) 40 VTH = 4.63V
MAX6315-03
50
TA = +85°C
30
TA = +25°C 2 1 0 0 1 2 3 4 5 SUPPLY VOLTAGE (V) TA = -40°C
20
VTH = 3.00V
10
0 -50 -30 -10 10 30 50 70 90 TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE (VCC RISING)
MAX6315-04
NORMALIZED RESET THRESHOLD vs. TEMPERATURE (VCC FALLING)
MAX6315-05
MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE
MAXIMUM TRANSIENT DURATION (µs) TA = +25°C RESET OCCURS ABOVE CURVE VTH = 4.63V 60
MAX6315-06
1.04 NORMALIZED RESET TIMEOUT PERIOD 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 -50 -30 -10 10 30 50 70
1.006 NORMALIZED RESET THRESHOLD 1.004 1.002 1.000 0.998 0.996 0.994
100
80
40
20 VT = 3.00V 0 10 100 RESET COMP. OVERDRIVE, VTH - VCC (mV) 1000
90
-50
-30
-10
10
30
50
70
90
TEMPERATURE (°C)
TEMPERATURE (°C)
______________________________________________________________Pin Description
PIN 1 2 3 4 NAME GND RESET MR VCC Ground Active-Low Open-Drain Output. Connect to an external pull-up resistor. Can be pulled up to a voltage higher than VCC, but less than 6V. Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for the reset timeout period (tRP) after the reset conditions are terminated. Connect to VCC if not used. Supply Voltage and Reset Threshold Monitor Input FUNCTION
_______________________________________________________________________________________
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