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19-2000; Rev 1; 1/99
Open-Drain SOT P Reset Circuit
________________General Description
The MAX6315 low-power CMOS microprocessor (P) supervisory circuit is designed to monitor power supplies in P and digital systems. It provides excellent circuit 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 threshold voltages in 100mV increments from 2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms, and 1120ms (minimum) are also available. The device comes in a SOT143 package. For microcontrollers (Cs) and Ps 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 1.8% Reset Threshold Accuracy at TA = +25C o 2.5% Reset Threshold Accuracy Over Temp. o Four Reset Timeout Periods Available: 1ms, 20ms, 140ms, or 1120ms (minimum) o Immune to Short VCC Transients o 5A Supply Current o Pin-Compatible with MAX811
MAX6315
________________________Applications
Computers Controllers Intelligent Instruments Critical P and C 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 P
MAX6315
MR RESET CIRCUITRY
RESET
RESET
RESET
2
3
MR
MAX6315 GND
SOT143
________________________________________________________________ Maxim Integrated Products
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Open-Drain SOT P 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/s Continuous Power Dissipation (TA = +70C) SOT143 (derate 4mW/C above +70C) ........................320mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
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 = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Voltage Range VCC Supply Current Reset Threshold (Note 1) Reset Threshold Tempco VCC to Reset Delay Reset Timeout Period 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 = 80A RESET Output Leakage Current VCC > VTH, RESET deasserted 0.3 1 A 32 VIL VIH VIL VIH VTH > 4.0V VTH < 4.0V 0.8 2.4 0.3 x VCC 0.7 x VCC 1 100 500 63 100 0.4 0.3 V s ns ns k V SYMBOL VCC ICC VTH VTH/C VCC = falling at 1mV/s MAX6315US_ _D1-T MAX6315US_ _D2-T MAX6315US_ _D3-T MAX6315US_ _D4-T 1 20 140 1120 CONDITIONS TA = -40C to +85C VCC = 5.5V, no load VCC = 3.6V, no load TA = +25C TA = -40C to +85C MIN 1.0 5 4 VTH 60 35 1.4 28 200 1570 TYP MAX 5.5 12 10 VTH + 1.8% VTH + 2.5% UNITS V A V ppm/C s 2 40 280 2240 ms
VTH - 1.8% VTH - 2.5%
tRP
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 and Marking Information).
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_______________________________________________________________________________________
Open-Drain SOT P Reset Circuit
__________________________________________Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6315-01 MAX6315-02
MAX6315
SUPPLY CURRENT vs. TEMPERATURE
6 5 SUPPLY CURRENT (A) 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 (A) 4 3
POWER-DOWN RESET DELAY vs. TEMPERATURE
VCC FALLING AT 1mV/s POWER-DOWN RESET DELAY (s) 40 VTH = 4.63V
MAX6315-03
50
TA = +85C
30
TA = +25C 2 1 0 0 1 2 3 4 5 SUPPLY VOLTAGE (V) TA = -40C
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 (s) TA = +25C 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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Open-Drain SOT P Reset Circuit MAX6315
_______________Detailed Description
Reset Output
A microprocessor's (P's) reset input starts the P in a known state. The MAX6315 asserts reset to prevent code-execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for VCC > 1V (see Electrical Characteristics). Once VCC exceeds the reset threshold, the internal timer keeps reset asserted for the reset timeout period (tRP); after this interval RESET goes high. If a brownout condition occurs (monitored voltage dips below its programmed reset threshold), RESET goes low. Any time VCC dips below the reset threshold, the internal timer resets to zero and RESET goes low. The internal timer starts when VCC returns above the reset threshold, and RESET remains low for the reset timeout period. The MAX6315's RESET output structure is a simple open-drain N-channel MOSFET switch. Connect a pullup resistor to any supply in the 0V to +6V range. Select a resistor value large enough to register a logic low when RESET is asserted (see Electrical Characteristics), and small enough to register a logic high while supplying all input current and leakage paths connected to the RESET line. A 10k pull-up is sufficient in most applications. Often, the pull-up connected to the MAX6315's RESET output will connect to the supply voltage monitored at the IC's VCC pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply (Figure 1). This is one useful feature of an open-drain output. Keep in mind that as the MAX6315's V CC decreases below 1V, so does the IC's ability to sink current at RESET. Finally, with any pull-up, RESET will be pulled high as VCC decays toward 0V. The voltage where this occurs depends on the pull-up resistor value and the voltage to which it connects (see Electrical Characteristics).
+3.3V +5.0V
VCC 10k MR RESET 5V SYSTEM
MAX6315
GND
Figure 1. MAX6315 Open-Drain RESET Output Allows Use with Multiple Supplies
If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1F capacitor from MR to ground provides additional noise immunity.
__________Applications Information
Negative-Going VCC Transients In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration negative-going transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Threshold Overdrive, for which reset pulses are not generated. The graph was produced using negativegoing pulses, starting at VRST max and ending below the programmed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going VCC transient may typically have without causing a reset pulse to be issued. As the transient amplitude increases (i.e., goes farther below the reset threshold), the maximum allowable pulse width decreases. A 0.1F bypass capacitor mounted close to V CC provides additional transient immunity.
Manual-Reset Input
Many P-based products require manual-reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for the reset active timeout period after MR returns high. MR has an internal 63k pull-up resistor, so it can be left open if not used. Connect a normally open momentary switch from MR to GND to create a manual reset function; external debounce circuitry is not required.
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_______________________________________________________________________________________
Open-Drain SOT P Reset Circuit
________________________________________________________Ordering Information
PART MAX6315US50D1-T MAX6315US49D1-T MAX6315US48D1-T MAX6315US47D1-T MAX6315US46D1-T MAX6315US45D1-T MAX6315US44D1-T MAX6315US43D1-T MAX6315US42D1-T MAX6315US41D1-T MAX6315US40D1-T MAX6315US39D1-T MAX6315US38D1-T MAX6315US37D1-T MAX6315US36D1-T MAX6315US35D1-T MAX6315US34D1-T MAX6315US33D1-T MAX6315US32D1-T MAX6315US31D1-T MAX6315US30D1-T MAX6315US29D1-T MAX6315US28D1-T MAX6315US27D1-T MAX6315US26D1-T MAX6315US25D1-T NOMINAL VTH (V) 5.00 4.90 4.80 4.70 4.63 4.50 4.39 4.30 4.20 4.10 4.00 3.90 3.80 3.70 3.60 3.50 3.40 3.30 3.20 3.08 3.00 2.93 2.80 2.70 2.63 2.50 MIN tRP (ms) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SOT TOP MARK FX_ _ FY_ _ FZ_ _ GA_ _ GB_ _ GC_ _ GD_ _ GE_ _ GF_ _ GG_ _ GH_ _ GI_ _ GJ_ _ GK_ _ GL_ _ GM_ _ GN_ _ GO_ _ GP_ _ GQ_ _ GR_ _ GS_ _ GT_ _ GU_ _ GV_ _ GW_ _ PART MAX6315US50D2-T MAX6315US49D2-T MAX6315US48D2-T MAX6315US47D2-T MAX6315US46D2-T MAX6315US45D2-T MAX6315US44D2-T MAX6315US43D2-T MAX6315US42D2-T MAX6315US41D2-T MAX6315US40D2-T MAX6315US39D2-T MAX6315US38D2-T MAX6315US37D2-T MAX6315US36D2-T MAX6315US35D2-T MAX6315US34D2-T MAX6315US33D2-T MAX6315US32D2-T MAX6315US31D2-T MAX6315US30D2-T MAX6315US29D2-T MAX6315US28D2-T MAX6315US27D2-T MAX6315US26D2-T MAX6315US25D2-T NOMINAL VTH (V) 5.00 4.90 4.80 4.70 4.63 4.50 4.39 4.30 4.20 4.10 4.00 3.90 3.80 3.70 3.60 3.50 3.40 3.30 4.20 3.08 3.00 2.93 2.80 2.70 2.63 2.50 MIN tRP (ms) 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 SOT TOP MARK GX_ _ GY_ _ GZ_ _ HA_ _ HB_ _ HC_ _ HD_ _ HE_ _ HF_ _ HG_ _ HH_ _ HI_ _ HJ_ _ HK_ _ HL_ _ HM_ _ HN_ _ HO_ _ HP_ _ HQ_ _ HR_ _ HS_ _ HT_ _ HU_ _ HV_ _ HW_ _
MAX6315
The MAX6315 is available in a SOT143 package, -40C to +85C temperature range. The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code. Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.
Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.
Note: All devices available in tape-and-reel only. Contact factory for availability.
_______________________________________________________________________________________
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Open-Drain SOT P Reset Circuit MAX6315
___________________________________________Ordering Information (continued)
PART MAX6315US50D3-T MAX6315US49D3-T MAX6315US48D3-T MAX6315US47D3-T MAX6315US46D3-T MAX6315US45D3-T MAX6315US44D3-T MAX6315US43D3-T MAX6315US42D3-T MAX6315US41D3-T MAX6315US40D3-T MAX6315US39D3-T MAX6315US38D3-T MAX6315US37D3-T MAX6315US36D3-T MAX6315US35D3-T MAX6315US34D3-T MAX6315US33D3-T MAX6315US32D3-T MAX6315US31D3-T MAX6315US30D3-T MAX6315US29D3-T MAX6315US28D3-T MAX6315US27D3-T MAX6315US26D3-T MAX6315US25D3-T NOMINAL VTH (V) 5.00 4.90 4.80 4.70 4.63 4.50 4.39 4.30 4.20 4.10 4.00 3.90 3.80 3.70 3.60 3.50 3.40 3.30 3.20 3.08 3.00 2.93 2.80 2.70 2.63 2.50 MIN tRP (ms) 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 SOT TOP MARK HX_ _ HY_ _ HZ_ _ IA_ _ IB_ _ IC_ _ ID_ _ IE_ _ IF_ _ IG_ _ IH_ _ II_ _ IJ_ _ IK_ _ IL_ _ IM_ _ IN_ _ IO_ _ IP_ _ IQ_ _ IR_ _ IS_ _ IT_ _ IU_ _ IV_ _ IW_ _ PART MAX6315US50D4-T MAX6315US49D4-T MAX6315US48D4-T MAX6315US47D4-T MAX6315US46D4-T MAX6315US45D4-T MAX6315US44D4-T MAX6315US43D4-T MAX6315US42D4-T MAX6315US41D4-T MAX6315US40D4-T MAX6315US39D4-T MAX6315US38D4-T MAX6315US37D4-T MAX6315US36D4-T MAX6315US35D4-T MAX6315US34D4-T MAX6315US33D4-T MAX6315US32D4-T MAX6315US31D4-T MAX6315US30D4-T MAX6315US29D4-T MAX6315US28D4-T MAX6315US27D4-T MAX6315US26D4-T MAX6315US25D4-T NOMINAL VTH (V) 5.00 4.90 4.80 4.70 4.63 4.50 4.39 4.30 4.20 4.10 4.00 3.90 3.80 3.70 3.60 3.50 3.40 3.30 3.20 3.08 3.00 2.93 2.80 2.70 2.63 2.50 MIN tRP (ms) 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 SOT TOP MARK IX_ _ IY_ _ IZ_ _ JA_ _ JB_ _ JC_ _ JD_ _ JE_ _ JF_ _ JG_ _ JH_ _ JI_ _ JJ_ _ JK_ _ JL_ _ JM_ _ JN_ _ JO_ _ JP_ _ JQ_ _ JR_ _ JS_ _ JT_ _ JU_ _ JV_ _ JW_ _
The MAX6315 is available in a SOT143 package, -40C to +85C temperature range. The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code. Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.
Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.
Note: All devices available in tape-and-reel only. Contact factory for availability.
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_______________________________________________________________________________________
Open-Drain SOT P Reset Circuit
___________________Chip Information
TRANSISTOR COUNT: 519
MAX6315
________________________________________________________Package Information
SOT1434.EPS
_______________________________________________________________________________________
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Open-Drain SOT P Reset Circuit MAX6315
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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