|
|
Part: MAX6837HXSD0
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX6832, MAX6838, MAX6834, MAX6836, MAX6833, MAX6835, MAX6837, MAX6839, MAX6840 Ultra-low-voltage SC70 Voltage Detectors And µP Reset Circuits
Company: Maxim Integrated Products
Datasheet: Download MAX6837HXSD0 datasheet File size : 539 kB
Request For quote: Find where to buy MAX6837HXSD0
Datasheet text preview:
19-2242; Rev 1; 1/02
Ultra-Low-Voltage SC70 Voltage Detectors and µP Reset Circuits
General Description
T h e MAX6832MAX6840 are microprocessor (µP) supervisory circuits used to monitor low-voltage power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating extern a l components and adjustments when used with +1.2V to +1.8V powered circuits. These devices assert a reset signal whenever the VCC supply voltage declines below a preset threshold or whenever manual reset (MR) is asserted. Reset remains asserted for a fixed timeout delay after VCC has risen a b o v e the reset threshold or when manual reset is deasserted. Five different timeout periods are available: 70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s. Reset thresholds suitable for operation with a variety of supply voltages are available. The MAX6832/MAX6835/MAX6838 have a push-pull a c t i v e - l o w reset output (RESET). The MAX6833/ MAX6836/MAX6839 have a push-pull active-high reset output (RESET) and the MAX6834/MAX6837/MAX6840 have an open-drain active-low reset output (RESET). The open-drain active-low reset output requires a pullup resistor that can be connected to a voltage higher than VCC. The MAX6835/MAX6836/MAX6837 feature a debounced manual reset input (MR), while the MAX6838/MAX6839/ MAX6840 provide a RESET-IN input allowing the user to externally adjust the reset threshold. The reset comparator is designed to ignore fast transients on VCC. Low supply current of 7.5µA makes the MAX6832 MAX6840 ideal for use in portable equipment. These devices are available in 3- and 4-pin SC70 packages.
Features
o Factory-Set Reset Threshold Voltages for Nominal Supplies from 1.2V to 1.8V o Low Power Consumption: 7.5µA (typ) o Space-Saving 3- and 4-Pin SC70 Packages o ±2.5% Reset Threshold Accuracy Over Temperature o Five Different Timeout Periods Available: 70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s o Three Reset Output Configurations Push-Pull RESET Push-Pull RESET Open-Drain RESET o Guaranteed Reset Valid to VCC = 0.55V--Active-Low 0.75V--Active-High o Adjustable Threshold Reset-In Option o Manual Reset Input Option o Immune to Short Negative VCC Transients o Pin Compatible with MAX803/MAX809/MAX810, MAX6711/MAX6712/MAX6713, and MAX6381MAX6390 Series
MAX6832MAX6840
Ordering Information
PART MAX6832_XRD_-T MAX6833_XRD_-T MAX6834_XRD_-T MAX6835_XSD_-T MAX6836_XSD_-T MAX6837_XSD_-T MAX6838XSD_-T MAX6839XSD_-T MAX6840XSD_-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 -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 3 SC70-3 3 SC70-3 3 SC70-3 4 SC70-4 4 SC70-4 4 SC70-4 4 SC70-4 4 SC70-4 4 SC70-4
Applications
Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment
Pin Configurations appear at end of data sheet. Typical Operating Circuit apears at end of data sheet. Selector Guide appears at end of data sheet.
Insert the desired suffix letter from the Threshold Suffix Guide (MAX6832MAX6837) and the Active Timeout Period Guide tables into the blanks to complete the part number. Sample stock is generally available on standard versions only (see Standard Versions table). Standard versions require a minimum order increment of 2.5k units. Nonstandard versions must be ordered in 10k unit increments. Contact factory for availability. All parts are offered in tape-and-reel only.
________________________________________________________________ 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.
Ultra-Low-Voltage SC70 Voltage Detectors and µP Reset Circuits MAX6832MAX6840
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC ......-0.3V to +6.0V Open-Drain RESET, MR ......-0.3V to +6.0V RESET-IN, Push-Pull RESET and RESET ....-0.3V to (VCC + 0.3V) Input/Output Current (all pins) ...........20mA Continous Power Dissipation (TA = +70°C) 3-Pin SC70 (derate 2.9mW/°C above +70°C) ......235mW 4-Pin SC70 (derate 3.1mW/°C above +70°C) ......245mW Operating Temperature Range ...-40°C to +85°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +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
(VCC = +0.55V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS TA = -40°C to +85°C MAX6832/MAX6835/MAX6838 MAX6834/MAX6837/MAX6840 Supply Voltage Range VCC TA = -40°C to +85°C MAX6833/MAX6836/MAX6839 TA = 0°C to +85°C MAX6833/MAX6836/MAX6839 VCC = 1.2V, no load, reset not asserted Supply Current ICC VCC = 1.8V, no load, reset not asserted VCC = 3.6V, no load, reset not asserted W V Reset Threshold VTH I H G F (Note 2) RESET-IN Threshold RESET-IN Leakage Current Reset Threshold Hysteresis VCC or RESET-IN to Reset Delay V RSTIN I RSTIN V HYS VCC falling, step signal from (VTH + 100mV) to (VTH - 100mV) D0 D1 Reset Active Timeout Period tRP D2 D3 D4 1 20 140 1120 1.1V VCC 3.3V, 0°C to +85°C 1.1V VCC 3.3V, -40°C to +85°C 1.620 1.530 1.350 1.275 1.080 1.020 -2.5% -3.0% -25 0.75 60 0.07 1.5 30 210 1680 2 40 280 2240 ms MIN 0.55 TYP MAX 3.6 V UNITS
0.85 0.75 7.5 9 16 1.665 1.575 1.388 1.313 1.110 1.050 444 444
3.6 3.6 13 16 25 1.710 1.620 1.425 1.350 1.140 1.080 +2.5% +3.0% +25
µA
V
mV nA %VTH µs
2
_______________________________________________________________________________________
Ultra-Low-Voltage SC70 Voltage Detectors and µP Reset Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +0.55V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER Propagation Delay (D0 only) Startup Time (D0 only) MR Input Voltage MR Minimum Input Pulse Width MR Glitch Rejection MR to Reset Delay MR Pullup Resistance To VCC Open-Drain RESET Output Voltage Open-Drain RESET Output Leakage Current VCC 0.55V, ISINK =15µA, reset asserted VOL VCC 1.0V, ISINK = 80µA, reset asserted VCC 1.5V, ISINK = 200µA, reset asserted ILKG VCC > VTH, reset not asserted VCC 0.55V, ISINK = 15µA, reset asserted VOL Push-Pull RESET Output Voltage VOH VCC 1.0V, ISINK = 80µA, reset asserted VCC 1.5V, ISINK = 200µA, reset asserted VCC 1.1V, ISOURCE = 50µA, reset not asserted VCC 1.5V, ISOURCE = 150µA, reset asserted VCC 0.75V, ISOURCE = 10µA, reset asserted (Note 2) Push-Pull RESET Output Voltage VOH VCC 0.85V, ISOURCE = 10µA, reset asserted VCC 1.0V, ISOURCE = 50µA, reset asserted VCC 1.5V, ISOURCE = 150µA, reset asserted VOL VCC 1.1V, ISINK = 80µA, reset not asserted VCC 1.5V, ISINK = 200µA, reset not asserted 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.2 x VCC 0.2 x VCC V VIL VIH MR driven from VCC to 0 MR driven from VCC to 0 MR driven from VCC to 0 14 0.7 x VCC 2 100 500 20 26 0.15 0.15 0.2 1.0 0.2 x VCC 0.2 x VCC 0.2 x VCC µA V SYMBOL tP CONDITIONS VCC rising, step signal from (VTH - 100mV) to (VTH + 100mV) VCC rising from 0 to 1.1V (tR < 1µs) MIN TYP 70 150 0.3 x VCC MAX UNITS µs µs V µs ns ns k
MAX6832MAX6840
Note 1: 100% production tested at +25°C. Over temperature limits are guaranteed by design. Note 2: Temperature range is from 0°C to +85°C.
_______________________________________________________________________________________
3
Others parts begin by ma
|
|
|
