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19-1412; Rev 0; 12/98
4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset
General Description
The MAX6335/MAX6336/MAX6337 microprocessor (P) supervisory circuits monitor the power supplies in 1.8V to 3.3V P and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments. They also feature a debounced manual-reset input. These devices perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold or whenever manual reset is asserted. Reset remains asserted for a preset timeout period after VCC has risen above the reset threshold or after manual reset is deasserted. The only difference among the three devices is their output. The MAX6336 (push/pull) and MAX6337 (open-drain) have an activelow RESET output, while the MAX6335 (push/pull) has an active-high RESET output. The MAX6335/MAX6336 are guaranteed to be in the correct state for VCC down to 0.7V. The MAX6337 is guaranteed to be in the correct state for VCC down to 1.0V. The reset comparator in these ICs is designed to ignore fast transients on VCC. Reset thresholds are factorytrimmable between 1.6V and 2.5V, in approximately 100mV increments. There are 15 standard versions available (2500 piece minimum-order quantity); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-critical applications, the MAX6335/MAX6336/MAX6337 come packaged in a 4-pin SOT143. o Low 3.3A Supply Current o Precision Monitoring of 1.8V and 2.5V PowerSupply Voltages o Reset Thresholds Available from 1.6V to 2.5V, in Approximately 100mV Increments o Debounced Manual Reset o Fully Specified over Temperature o Three Power-On Reset Pulse Widths Available (1ms min, 20ms min, 100ms min) o Low Cost o Three Available Output Structures: Push/Pull RESET, Push/Pull RESET, Open-Drain RESET o Guaranteed RESET/RESET Valid to VCC = 0.7V (MAX6335/MAX6336) o Power-Supply Transient Immunity o No External Components o 4-Pin SOT143 Package o Pin-Compatible with MAX811/MAX812 and MAX6314/MAX6315
Features
o Ultra-Low 0.7V Operating Supply Voltage
MAX6335/MAX6336/MAX6337
Applications
Pentium IITM Computers Computers Controllers Intelligent Instruments Critical P/C Power Monitoring Portable/Battery-Powered Equipment Automotive
PART*
MAX6335US__D_-T MAX6336US__D_-T MAX6337US__D_-T
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 4 SOT143 4 SOT143 4 SOT143
Typical Operating Circuit and Pin Configuration appear at end of data sheet. Selector Guide appears at end of data sheet. Pentium II is a trademark of Intel Corp.
* These devices are available in factory-set VCC reset thresholds from 1.6V to 2.5V, in approximately 0.1V increments. Choose the desired reset threshold suffix from Table 1 and insert it in the blanks following "US" in the part number. Factory-programmed reset timeout periods are also available. Insert the number corresponding to the desired nominal reset timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in the blank following "D" in the part number. There are 15 standard versions with a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only (see Selector Guide). Contact the factory for availability of nonstandard versions (required order increment is 10,000 pieces). All devices available in tape-and-reel only.
________________________________________________________________ Maxim Integrated Products
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4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset MAX6335/MAX6336/MAX6337
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC ......................................................................-0.3V to +6V Push/Pull RESET or RESET, MR ............-0.3V to (VCC + 0.3V) Open-Drain RESET ..............................................-0.3V to +6V Input Current (VCC) .............................................................20mA Output Current (RESET, 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 = full range, MR = VCC or unconnected, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C and VCC = 3V, reset not asserted.) PARAMETER SYMBOL CONDITIONS TA = 0C to +85C Supply Voltage Range VCC TA = -40C to +85C Supply Current ICC No load MAX6335/MAX6336 MAX6337 MAX6335/MAX6336 MAX6337 MIN 0.7 1.0 0.78 1.2 3.0 3.3 VTH 1.8% VTH 3% 1 20 100 VTH VTH 24 1.5 30 150 2 40 200 0.4 0.3 0.8VCC 0.8VCC 0.8VCC 0.8VCC 0.3 0.3 1 VCC = 2.6V VCC = 2.6V V MR 0.3VCC 12 VCC > VTH, RESET deasserted 20 160 0.42 0.7VCC 30 0.5 V V V V s ns s V k A ms TYP MAX 5.5 5.5 5.5 5.5 6.0 7.0 VTH + 1.8% VTH + 3% A V UNITS
VCC = 1.8V VCC = 2.5V
TA = +25C TA = -40C to +85C
Reset Threshold
VTH
MAX633_US_ _D_-T, Table 1 VCC falling at 10V/ms MAX633_US_ _D1-T
V s
VCC Falling Reset Delay Reset Active Timeout Period RESET Output Low Voltage (MAX6336/MAX6337) RESET Output High Voltage (MAX6336)
tRP
MAX633_US_ _D2-T MAX633_US_ _D3-T Reset asserted Reset not asserted Reset asserted Reset not asserted ISINK = 50A, VCC 1.0V ISINK = 500A, VCC 1.8V ISOURCE = 200A, VCC 1.8V ISOURCE = 500A, VCC 2.7V ISOURCE = 1A, VCC 1.0V ISOURCE = 200A, VCC 1.8V ISINK = 500A, VCC 1.8V ISINK = 1.2mA, VCC 2.7V
VOL VOH VOH VOL
RESET Output Voltage (MAX6335) MR Minimum Pulse Width MR Glitch Immunity MR Reset Delay MR Threshold MR Pull-Up Resistance RESET Output Leakage Current (MAX6337)
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4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset
__________________________________________Typical Operating Characteristics
(Reset not asserted, TA = +25C, unless otherwise noted.)
MAX6335/MAX6336/MAX6337
SUPPLY CURRENT vs. TEMPERATURE
MAX6335/36/37 toc-1
NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE
NORMALIZED RESET TIMEOUT PERIOD 1.040 1.030 1.020 1.010 1.000 0.990 0.980 0.970 0.960 0.950 VTH = 2.2V
MAX6335/36/37-2
OUTPUT VOLTAGE LOW vs. SUPPLY VOLTAGE
70 OUTPUT VOLTAGE LOW (mV) 60 50 40 30 20 10 0 TA = -40C 0.50 1.00 1.50 2.00 2.50 3.00 TA = +25C TA = +85C VTH = 2.5V ISINK = 500A RESET ASSERTED
MAX6335/36/37 toc-3
4.0 3.8 3.6 3.4 ICC (A) 3.2 3.0 2.8 2.6 2.4 2.2 2.0 -60 -40 -20 0 20 40 60 80 RESET NOT ASSERTED VCC = 1.8V VCC = 2.5V
1.050
80
100
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
TEMPERATURE (C)
VCC (V)
OUTPUT VOLTAGE HIGH vs. SUPPLY VOLTAGE
OUTPUT VOLTAGE HIGH (VCC - VOH) (mV) 140 120 100 80 60 40 20 TA = +85C 0 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5 VCC (V) 0 TA = +25C TA = -40C MAXIMUM TRANSIENT DURATION (s) VTH = 2.2V ISOURCE = 100A RESET ASSERTED
MAX6335/36/37 toc-4
MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE
MAX6335/36/37 toc-5
VCC FALLING PROPAGATION DELAY vs. TEMPERATURE
MAX6332/33/34 toc-6
160
600 500 400 300 200 100 RESET DOES NOT OCCUR RESET OCCURS
80 70 PROPAGATION DELAY (s) 60 50 40 30 20 10 VCC FALLING AT 10V/ms VCC FALLING AT 1V/ms
0.1
100 1000 RESET COMPARATOR OVERDRIVE (mV)
1
10
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
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4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset MAX6335/MAX6336/MAX6337
Pin Description
PIN MAX6335 1 MAX6336 MAX6337 1 NAME GND Ground Active-Low Reset Output. RESET remains low while VCC is below the reset threshold, or MR is asserted and for a reset timeout period (tRP) after VCC rises above the reset threshold, or MR is deasserted. RESET on the MAX6337 is open-drain. Active-High Reset Output. RESET remains high while VCC is below the reset threshold, or MR is asserted and for a reset timeout period (tRP) after VCC rises above the reset threshold, or MR is deasserted. RESET also asserts when MR is low. 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 MR goes high. Leave unconnected or connect to VCC if not used. Supply Voltage (0.7V to 5.5V) FUNCTION
--
2
RESET
2
--
RESET
3 4
3 4
MR VCC
Applications Information
Manual-Reset Inputs
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 20k pull-up resistor, so it can be left unconnected 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.
signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases.
Ensuring a Valid Reset Output down to VCC = 0
When VCC falls below 1V and approaches the minimum operating voltage of 0.7V, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to the RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most Ps and circuitry do not operate at VCC below 1V. For the MAX6336, where RESET must be valid down to 0, adding a pull-down resistor between RESET and GND removes stray leakage currents, holding RESET low
Interfacing to Ps with Bidirectional Reset Pins
Since the RESET output on the MAX6337 is open-drain, this device interfaces easily with Ps that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the P supervisor's RESET output directly to the microcontroller's (C's) RESET pin with a single pull-up resistor allows either device to assert reset (Figure 1).
VCC VCC VCC P MOTOROLA 68HCXX RESET INPUT
MAX6337
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 V CC transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive graph. The graph shows the maximum pulse width that a negative-going VCC transient may typically have without issuing a reset
4
MR
RESET
GND
GND
Figure 1. Interfacing to Ps with Bidirectional Reset Pins
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4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset
VCC
Table 1. Factory-Trimmed Reset Thresholds*
RESET THRESHOLD SUFFIX MAX633_US25D_ MAX633_US24D_ 100k MAX633_US23D_ MAX633_US22D_ MAX633_US21D_ TA = +25C MIN TYP MAX 2.46 2.50 2.36 2.40 2.26 2.30 2.16 2.20 2.06 2.10 1.96 2.00 1.87 1.90 2.55 2.44 2.34 2.24 2.14 2.04 1.93 TA = -40C to +85C MIN 2.43 2.33 2.23 2.13 2.04 1.94 1.84 1.75 1.65 1.55 MAX 2.58 2.47 2.37 2.27 2.16 2.06 1.96 1.85 1.75 1.65
MAX6335/MAX6336/MAX6337
MAX6336
MR RESET
(a)
GND
VCC
MAX633_US20D_ MAX633_US19D_ 100k* MAX633_US18D_ MAX633_US17D_ MAX633_US16D_
1.77 1.80 1.83 1.67 1.70 1.73 1.57 1.60 1.63
MAX6335
MR RESET
(b)
GND
* Factory-trimmed reset thresholds are available in approximately 100mV increments, with a 1.8% room-temperature variance.
*ASSUMES HIGH-Z RESET INPUT TO THE P
Figure 2. Ensuring Reset Valid down to VCC = 0
(Figure 2a). The pull-down resistor value is not critical; 100k is large enough not to load RESET, and small enough to pull it low. For the MAX6335, where RESET must be valid to VCC = 0, a 100k pull-up resistor between RESET and VCC will hold RESET high when VCC falls below 0.7V (Figure 2b). Since the MAX6337 has an open-drain, active-low output, it typically uses a pull-up resistor. With this device, RESET will most likely not maintain an active condition, but will drift to a non-active level due to the pull-up resistor and the reduced sinking capability of the opendrain device. Therefore, this device is not recommended for applications where the RESET pin is required to be valid down to VCC = 0.
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4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset MAX6335/MAX6336/MAX6337
Selector Guide (standard versions*)
PART MAX6335US23D3-T MAX6335US22D3-T MAX6335US20D3-T MAX6335US18D3-T MAX6335US16D3-T MAX6336US23D3-T MAX6336US22D3-T MAX6336US20D3-T MAX6336US18D3-T MAX6336US16D3-T MAX6337US23D3-T MAX6337US22D3-T MAX6337US20D3-T MAX6337US18D3-T MAX6337US16D3-T OUTPUT STAGE Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET NOMINAL VTH (V) 2.30 2.20 2.00 1.80 1.60 2.30 2.20 2.00 1.80 1.60 2.30 2.20 2.00 1.80 1.60 MINIMUM RESET TIMEOUT (ms) 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 SOT TOP MARK KABQ KAAR KABP KAAQ KAAP KAAW KAAV KAAU KAAT KAAS KABS KAAZ KABR KAAY KAAX
* Sample stock is generally held on all standard versions.
Pin Configuration
TOP VIEW
VCC
Typical Operating Circuit
GND
1
4
VCC
VCC
VCC
MAX6335 MAX6336 MAX6337
MAX6335 MAX6336
MR RESET (RESET) GND RESET
P
RESET (RESET)
2
3
MR
GND
SOT143
( ) ARE FOR MAX6335
PUSHBUTTON SWITCH ( ) ARE FOR MAX6335
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4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset
Chip Information
TRANSISTOR COUNT: 505
MAX6335/MAX6336/MAX6337
Package Information
SOT1434.EPS
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4-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits with Manual Reset MAX6335/MAX6336/MAX6337
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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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