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Part: MAX6735KAWGD3-T
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX6730, MAX6731, MAX6732, MAX6733, MAX6734, MAX6735 Single-/dual-/triple-voltage µP Supervisory Circuits With Independent Watchdog Output
Company: Maxim Integrated Products
Datasheet: Download MAX6735KAWGD3-T datasheet File size : 2 kB
Request For quote: Find where to buy MAX6735KAWGD3-T
Datasheet text preview:
19-2629; Rev 2; 1/03
Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output
General Description
T h e MAX6730MAX6735 single-/dual-/triple-voltage microprocessor (µP) supervisors feature a watchdog t i m e r and manual reset capability. The MAX6730 MAX6735 offer factory-set reset thresholds for monitoring voltages from +0.9V to +5V and an adjustable reset input for monitoring voltages down to +0.63V. The combination of these features significantly improves system reliability and accuracy when compared to separate ICs or discrete components. The active-low reset output asserts and remains asserted for the reset timeout period after all the monitored voltages exceed their respective thresholds. Multiple factoryset reset threshold combinations reduce the number of external components required. The MAX6730/MAX6731 monitor a single fixed voltage, the MAX6732/MAX6733 monitor two fixed voltages, and the MAX6734/MAX6735 monitor two fixed voltages and one adjustable voltage. All devices are offered with six minimum reset timeout periods ranging from 1.1ms to 1120ms. The MAX6730MAX6735 feature a watchdog timer with an independent watchdog output. The watchdog timer prevents system lockup during code execution errors. A watchdog startup delay of 54s after reset asserts allows system initialization during power-up. The watchdog operates in normal mode with a 1.68s delay after initialization. The MAX6730/MAX6732/MAX6734 provide a n active-low, open-drain watchdog output. The MAX6731/MAX6733/MAX6735 provide an active-low, push-pull watchdog output. Other features include a manual reset input (MAX6730/ MAX6731/MAX6734/MAX6735) and push-pull reset output (MAX6731/MAX6733/MAX6735) or open-drain reset output (MAX6730/MAX6732/MAX6734). The MAX6730 MAX6733 are offered in a tiny SOT23-6 package. The M A X 6 7 3 4 / M A X 6 7 3 5 are offered in a space-saving SOT23-8 package. All devices are fully specified over the extended temperature range (-40°C to +85°C).
Features
o VCC1 (Primary Supply) Reset Threshold Voltages from +1.575V to +4.63V o VCC2 (Secondary Supply) Reset Threshold Voltages from +0.79V to +3.08V o Adjustable RSTIN Threshold for Monitoring Voltages Down to +0.63V (MAX6734/MAX6735 Only) o Six Reset Timeout Options o Watchdog Timer with Independent Watchdog Output 35s (min) Initial Watchdog Startup Period 1.12s (min) Normal Watchdog Timeout Period o Manual Reset Input (MAX6730/MAX6731/MAX6734/MAX6735) o Guaranteed Reset Valid down to VCC1 or VCC2 = +0.8V o Push-Pull RESET or Open-Drain RESET Output o Immune to Short VCC Transients o Low Supply Current: 14µA (typ) at +3.6V o Small 6-Pin and 8-Pin SOT23 Packages
MAX6730MAX6735
Ordering Information
PART* MAX6730 UT_D_ -T MAX6731 UT_D_ -T MAX6732 UT_ _D_ -T MAX6733 UT_ _D_ -T MAX6734 KA_ _D_ -T MAX6735 KA_ _D_ -T TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 8 SOT23-8 8 SOT23-8
Applications
Multivoltage Systems Telecom/Networking Equipment Computers/Servers Portable/Battery-Operated Equipment Industrial Equipment Printer/Fax Set-Top Boxes
*Note: Insert the threshold level suffixes for VCC1 and VCC2 (Table 1) after "UT" or "KA." For the MAX6730/MAX6731, insert only the VCC1 threshold suffix after the "UT." Insert the reset timeout delay (Table 2) after "D" to complete the part number. For example, the MAX6732UTLTD3-T provides a VCC1 threshold of +4.625V, a VCC2 threshold of +3.075V, and a 210ms reset timeout period. Sample stock is generally held on standard versions only (see the Standard Versions table). Standard versions have an order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 10,000 pieces. Contact factory for availability.
Typical Operating Circuit and Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output MAX6730MAX6735
ABSOLUTE MAXIMUM RATINGS
VCC1, VCC2, RSTIN, MR, WDI to GND ............-0.3V to +6V RST, WDO to GND (open drain).......-0.3V to +6V RST, WDO to GND (push-pull) ........-0.3V to (VCC1 + 0.3V) Input Current/Output Current (all pins) .......20mA Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) ........696mW 8-Pin SOT23-8 (derate 8.9mW/°C above +70°C) ........714mW Operating Temperature Range ...-40°C to +85°C Storage Temperature Range .....-65°C to +150°C Junction Temperature ......+150°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
(VCC1 = VCC2 = +0.8V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER Supply Voltage SYMBOL VCC1, VCC2 VCC1 < +5.5V, all I/O connections open, outputs not asserted ICC1 Supply Current VCC2 < +3.6V, all I/O connections open, outputs not asserted ICC2 VCC2 < +2.75V, all I/O connections open, outputs not asserted L (falling) M (falling) T (falling) S (falling) VCC1 Reset Threshold VTH1 R (falling) Z (falling) Y (falling) W (falling) V (falling) 4.500 4.250 3.000 2.850 2.550 2.250 2.125 1.620 1.530 4 3 4.625 4.375 3.075 2.925 2.625 2.313 2.188 1.665 1.575 11 9 4.750 4.500 3.150 3.000 2.700 2.375 2.250 1.710 1.620 V VCC1 < +3.6V, all I/O connections open, outputs not asserted CONDITIONS MIN 0.8 15 10 TYP MAX 5.5 39 28 µA UNITS V
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Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output
ELECTRICAL CHARACTERISTICS (continued)
(VCC1 = VCC2 = +0.8V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL T (falling) S (falling) R (falling) Z (falling) Y (falling) W (falling) VCC2 Reset Threshold VTH2 V (falling) I (falling) H (falling) G (falling) F (falling) E (falling) D (falling) Reset Threshold Tempco Reset Threshold Hysteresis V HYST Referenced to VTH typical VCC1 = (VTH1 + 100mV) to (VTH1 - 100mV) or VCC2 = (VTH2 + 75mV) to (VTH2 - 75mV) D1 D2 Reset Timeout Period tRP D3 D5 D6 D4 ADJUSTABLE RESET COMPARATOR INPUT (MAX6734/MAX6735) RSTIN Input Threshold RSTIN Input Current RSTIN Hysteresis RSTIN to Reset Output Delay tRSTIND VIL VIH 0.7 × VCC1 1 100 tMR 25 200 50 80 VRSTIN to (VRSTIN - 30mV) MANUAL RESET INPUT (MAX6730/MAX6731/MAX6734/MAX6735) MR Input Threshold MR Minimum Pulse Width MR Glitch Rejection MR to Reset Output Delay MR Pullup Resistance 0.3 × VCC1 V µs ns ns k V RSTIN IRSTIN 611 -25 3 22 626.5 642 +25 mV nA mV µs 1.1 8.8 140 280 560 1120 CONDITIONS MIN 3.000 2.850 2.550 2.250 2.125 1.620 1.530 1.350 1.275 1.080 1.020 0.810 0.765 TYP 3.075 2.925 2.625 2.313 2.188 1.665 1.575 1.388 1.313 1.110 1.050 0.833 0.788 20 0.5 MAX 3.150 3.000 2.700 2.375 2.250 1.710 1.620 1.425 1.350 1.140 1.080 0.855 0.810 ppm/oC % V UNITS
MAX6730MAX6735
VCC_ to RST Output Delay
tRD
45
µs
1.65 13.2 210 420 840 1680
2.2 17.6 280 560 1120 2240 ms
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