MAXIM MAX6832, MAX6840 User Manual

General Description

The MAX6832–MAX6840 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 external components and adjustments when used with +1.2V to +1.8V powered circuits.

These devices assert a reset signal whenever the V

supply voltage declines below a preset threshold or whenever manual reset (MR) is asserted. Reset remains asserted for a fixed timeout delay after VCChas risen above 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 active-low 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.

Applications

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable/Battery-Powered Equipment

Features

♦ Factory-Set Reset Threshold Voltages for

Nominal Supplies from 1.2V to 1.8V

♦ Low Power Consumption: 7.5µA (typ)

♦ Space-Saving 3- and 4-Pin SC70 Packages

♦ ±2.5% Reset Threshold Accuracy Over

Temperature

♦ Five Different Timeout Periods Available: 70µs

(voltage detector), 1.5ms, 30ms, 210ms, and 1.68s

♦ Three Reset Output Configurations

Push-Pull RESET Push-Pull RESET Open-Drain RESET

♦ Guaranteed Reset Valid to VCC=

0.55V—Active-Low

0.75V—Active-High

♦ Adjustable Threshold Reset-In Option

♦ Manual Reset Input Option

♦ Immune to Short Negative VCCTransients

♦ Pin Compatible with MAX803/MAX809/MAX810,

MAX6711/MAX6712/MAX6713, and MAX6381–MAX6390 Series

MAX6832–MAX6840

Ultra-Low-Voltage SC70 Voltage Detectors

and µP Reset Circuits

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2242; Rev 0; 10/01

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.

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 (MAX6832–MAX6837) 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.

*Future product—contact factory for availability.

查询MAX6839XSD1-T供应商

PART TEMP. RANGE PIN-PACKAGE

MAX6832_XRD_-T -40°C to +85°C 3 SC70-3

MAX6833_XRD_-T -40°C to +85°C 3 SC70-3

MAX6834_XRD_-T -40°C to +85°C 3 SC70-3

MAX6835_XSD_-T* -40°C to +85°C 4 SC70-4

MAX6836_XSD_-T* -40°C to +85°C 4 SC70-4

MAX6837_XSD_-T* -40°C to +85°C 4 SC70-4

MAX6838XSD_-T -40°C to +85°C 4 SC70-4

MAX6839XSD_-T -40°C to +85°C 4 SC70-4

MAX6840XSD_-T -40°C to +85°C 4 SC70-4

MAX6832–MAX6840

Ultra-Low-Voltage SC70 Voltage Detectors and µP Reset Circuits

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +0.55V to +3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

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.

Terminal Voltage (with respect to GND) V

........................................................................-0.3V to +6.0V

Open-Drain RESET, MR .......................................-0.3V to +6.0V

RESET-IN, Push-Pull RESET

and RESET ..............................................-0.3V to (V

+ 0.3V)

Input/Output Current (all pins) ............................................20mA

Continous Power Dissipation (T

= +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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range V

Supply Current I

Reset Threshold V

RESET-IN Threshold V

RESET-IN Leakage Current I

Reset Threshold Hysteresis V

VCC or RESET-IN to Reset Delay

Reset Active Timeout Period t

TA = -40°C to +85°C MAX6832/MAX6835/MAX6838 MAX6834/MAX6837/MAX6840

RSTIN

HYS

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 7.5 13

VCC = 1.8V, no load, reset not asserted 9 16

VCC = 3.6V, no load, reset not asserted 16 25

W 1.620 1.665 1.710

V 1.530 1.575 1.620

I 1.350 1.388 1.425

H 1.275 1.313 1.350

G 1.080 1.110 1.140

F (Note 2) 1.020 1.050 1.080

1.1V ≤ VCC ≤ 3.3V, 0°C to +85°C -2.5% 444 +2.5%

1.1V ≤ VCC ≤ 3.3V, -40°C to +85°C -3.0% 444 +3.0%

falling, step signal from

+ 100mV) to (VTH - 100mV)

D0 0.07

D1 1 1.5 2

D2 20 30 40

D3 140 210 280

D4 1120 1680 2240

0.55 3.6

0.85 3.6

0.75 3.6

-25 +25 nA

0.75 %V

60 µs

µA

MAX6832–MAX6840

Ultra-Low-Voltage SC70 Voltage Detectors

and µP Reset Circuits

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +0.55V to +3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

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.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Propagation Delay (D0 only) t

Startup Time (D0 only) VCC rising from 0 to 1.1V (tR < 1µs) 150 µs

MR Input Voltage

MR Minimum Input Pulse Width MR driven from V MR Glitch Rejection MR driven from V MR to Reset Delay MR driven from V MR Pullup Resistance To V

Open-Drain RESET Output Voltage

Open-Drain RESET Output Leakage Current

Push-Pull RESET Output Voltage

VCC rising, step signal

LKG

from (V

VCC ≥ 0.55V, I

VCC ≥ 1.0V, I

VCC ≥ 1.5V, I

VCC > V

VCC ≥ 0.55V, I

VCC ≥ 1.0V, I

VCC ≥ 1.5V, I

VCC ≥ 1.1V, I asserted

VCC ≥ 1.5V, I

VCC ≥ 0.75V, I

- 100mV) to (VTH + 100mV)

to 0 1 µs

to 0 100 ns

to 0 500 ns

=15µA, reset asserted 0.15

SINK

= 80µA, reset asserted 0.15

SINK

= 200µA, reset asserted 0.2

SINK

reset not asserted 1.0 µA

TH,

= 15µA, reset asserted 0.2 x V

SINK

= 80µA, reset asserted 0.2 x V

SINK

= 200µA, reset asserted 0.2 x V

SINK

= 50µA, reset not

SOURCE

= 150µA, reset asserted 0.8 x V

SOURCE

= 10µA, reset asserted

SOURCE

(Note 2)

VCC ≥ 0.85V, I

VCC ≥ 1.0V, I

VCC ≥ 1.5V, I

VCC ≥ 1.1V, I

VCC ≥ 1.5V, I

SOURCE

SINK

= 10µA, reset asserted 0.8 x V

SOURCE

= 50µA, reset asserted 0.8 x V

= 150µA, reset asserted 0.8 x V

= 80µA, reset not asserted 0.2 x V

= 200µA, reset not asserted 0.2 x V

70 µs

0.7 x V

0.3 x V

14 20 26 kΩ

0.8 x V

MAX6832–MAX6840

Ultra-Low-Voltage SC70 Voltage Detectors and µP Reset Circuits

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= full range and TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C).

SUPPLY CURRENT vs. TEMPERATURE

MAX6832-40 toc01

SUPPLY CURRENT (µA)

-40 0 20-20

60 80

TEMPERATURE (°C)

VCC = 3.6V

VCC = 3.0V

VCC = 2.5V

VCC = 1.8V

VCC = 1.5V

VCC = 0.55V

100

200

150

250

300

-40 20 40-20 0 60 80

POWER-DOWN RESET DELAY

vs. TEMPERATURE

MAX6832-40 toc02

TEMPERATURE (°C)

POWER-DOWN RESET DELAY (µs)

VOD = OVERDRIVE (mV)

VOD = 10mV

VOD = 20mV

VOD = 100mV

VOD = 200mV

0.994

0.996

0.995

0.999

0.998

0.997

1.002

1.001

1.000

1.003

-40 0-20 20 40 60 80

NORMALIZED RESET THRESHOLD

vs. TEMPERATURE

MAX6832-40 toc04

TEMPERATURE (°C)

NORMALIZED RESET THRESHOLD

VTH = 1.665V

0.94

0.98

0.96

1.02

1.00

1.04

1.06

-40 20 40-20 0 60 80

NORMALIZED POWER-UP RESET

TIMEOUT vs. TEMPERATURE

MAX6832-40 toc03

TEMPERATURE (°C)

NORMALIZED RESET TIMEOUT PERIOD

D1 OPTION

D2 OPTION

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