Maxim MAX6827VUT-T Datasheet

General Description

The MAX6826–MAX6831 are ultra-low-voltage micro­processor (µP) supervisory circuits designed to monitor
two power supplies and have manual reset and watch­dog input functions. These devices assert a system reset
if any of the monitored supplies fall below the prepro­grammed thresholds, and maintain reset for a minimum
timeout period after the supplies rise above the threshold.
Microprocessor supervisors significantly improve system
reliability and accuracy compared to separate ICs or dis­crete components. These devices monitor primary volt­ages from +1.8V to +5.0V and secondary voltages from
+0.9V to +2.5V. These devices are guaranteed to be in
the correct state for VCCdown to +1.0V.

A variety of preprogrammed reset threshold voltages
are available (see Threshold Suffix Guide). The devices
include manual reset and watchdog inputs. The
MAX6829/MAX6830/MAX6831 provide a factory­trimmed threshold to monitor a 2nd voltage down to
+0.9V. The MAX6826/MAX6829 have a push-pull
RESET, the MAX6827/MAX6830 have a push-pull
RESET and the MAX6828/MAX6831 have an open-drain
RESET. The MAX6826/MAX6827/MAX6828 have an aux­iliary monitor that allows user adjustable input to monitor
voltages down to +0.6V. See Selector Guide for func­tions available.

________________________Applications

Features

♦ Monitor Primary VCCSupplies from +1.8V

to +5.0V and Secondary V

CC2

Supplies

from +0.9V to +2.5V

♦ User Adjustable RESET IN Down to +0.63V

(MAX6826/MAX6827/MAX6828)

♦ 140ms (min) Reset Timeout Delay

♦ 1.6s Watchdog Timeout Period

♦ Manual Reset Input

♦ Three Reset Output Options

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

♦ Guaranteed Reset Valid Down to V

CC

= +1.0V

♦ Immune to Short Negative V

CC

Transients

♦ No External Components

♦ Small 6-pin SOT23 Packages

MAX6826–MAX6831

Dual Ultra-Low-Voltage SOT23 µP Supervisors

with Manual Reset and Watchdog Timer

________________________________________________________________ Maxim Integrated Products 1

GND

WDIMR

16V

CC

5 RESET IN/V

CC2

RESET(RESET)

(RESET) MAX6827/MAX6830 ONLY
RESET IN FOR MAX6826/MAX6827/MAX6828 ONLY
V

CC2

FOR MAX6829/MAX6830/MAX6831 ONLY

MAX6826–

MAX6831

SOT23-6

TOP VIEW

2

34

Pin Configuration

19-1867; Rev 1; 1/02

Ordering Information

Standard Versions Table*

†

Insert the desired suffix letter (from Standard Versions table) into

the blanks to complete the part number.

PART

†

TEMP RANGE PIN-PACKAGE
MAX6826_UT-T -40°C to +125°C 6 SOT23-6
MAX6827_UT-T -40°C to +125°C 6 SOT23-6
MAX6828_UT-T -40°C to +125°C 6 SOT23-6
MAX6829_ _UT-T -40°C to +125°C 6 SOT23-6
MAX6830_ _UT-T -40°C to +125°C 6 SOT23-6
M AX6831_ _UT-T -40°C to +125°C 6 SOT23-6

MAX6826/MAX6827/MAX6828

L
S
R
Z
V

*Samples are typically available for standard versions only.
The MAX6826/MAX6827/MAX6828 require a 2.5k minimum
order increment for all versions. Contact factory for availability.

Portable/Battery­Powered Equipment

Embedded Controllers
Intelligent Instruments

Automotive Systems
Critical µP Monitoring
Multivoltage Systems

Typical Operating Circuit appears at end of data sheet.

Threshold Suffix Guide appears at end of data sheet.

Selector Guide appears at end of data sheet.

Standard Versions Table continued at end of data sheet.

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.

MAX6826–MAX6831

Dual Ultra-Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +4.5V to +5.5V for MAX68_ _L/M, VCC= +2.7V to +3.6V for MAX68_ _T/S/R, VCC= +2.1V to +2.75V for MAX68_ _Z/Y,
V

CC

= +1.53V to +2.0V for MAX68_ _W/V; TA= -40°C to +125°C, unless otherwise specified. 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.

VCC, V

CC2

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

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

Push-Pull RESET, RESET............................-0.3V to (V

CC

+ 0.3V)

MR, WDI, RESET IN....................................-0.3V to (V

CC

+ 0.3V)

Input Current (V

CC

).............................................................20mA

Output Current (RESET, RESET).........................................20mA

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23 (derate 8.7mW/°C above +70°C)..............696mW

Operating Temperature Range .........................-40°C to +125°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

TA = 0°C to +85°C 1.0 5.5

Operating Voltage Range V

CC

TA = -40°C to +125°C 1.2 5.5

V

TA = -40°C to +85°C1020

VCC = +5.5V,
no load

T

A

= -40°C to +125°C30

TA = -40°C to +85°C716

VCC Supply Current
MR and WDI Unconnected

I

CC

VCC = +3.6V,
no load

T

A

= -40°C to +125°C25

µA

V

CC2

Supply Current V

CC2

≤ +2.5V 2 µA

TA = -40°C to +85°C 4.50 4.63 4.75

MAX68_ _L

T

A

= -40°C to +125°C 4.47 4.63 4.78

TA = -40°C to +85°C 4.25 4.38 4.50

MAX68_ _M

T

A

= -40°C to +125°C 4.22 4.38 4.53

TA = -40°C to +85°C 3.00 3.08 3.15

MAX68_ _T

T

A

= -40°C to +125°C 2.97 3.08 3.17

TA = -40°C to +85°C 2.85 2.93 3.00

MAX68_ _S

T

A

= -40°C to +125°C 2.83 2.93 3.02

TA = -40°C to +85°C 2.55 2.63 2.70

MAX68_ _R

T

A

= -40°C to +125°C 2.53 2.63 2.72

TA = -40°C to +85°C 2.25 2.32 2.38

MAX68_ _Z

T

A

= -40°C to +125°C 2.24 2.32 2.40

TA = -40°C to +85°C 2.12 2.19 2.25

MAX68_ _Y

T

A

= -40°C to +125°C 2.11 2.19 2.26

TA = -40°C to +85°C 1.62 1.67 1.71

MAX68_ _W

T

A

= -40°C to +125°C 1.61 1.67 1.72

VCC Reset Threshold
(V

CC

Falling)

V

TH

MAX68_ _V TA = -40°C to +85°C 1.52 1.58 1.62

V

MAX6826–MAX6831

Dual Ultra-Low-Voltage SOT23 µP Supervisors

with Manual Reset and Watchdog Timer

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +4.5V to +5.5V for MAX68_ _L/M, VCC= +2.7V to +3.6V for MAX68_ _T/S/R, VCC= +2.1V to +2.75V for MAX68_ _Z/Y,
V

CC

= +1.53V to +2.0V for MAX68_ _W/V; TA= -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TA = -40°C to +85°C 2.244 2.313 2.381

Z

T

A

= -40°C to +125°C 2.238 2.313 2.388

TA = -40°C to +85°C 2.119 2.188 2.257

Y

T

A

= -40°C to +125°C 2.113 2.188 2.263

TA = -40°C to +85°C 1.615 1.665 1.715

W

T

A

= -40°C to +125°C 1.611 1.665 1.719

TA = -40°C to +85°C 1.525 1.575 1.625

V

T

A

= -40°C to +125°C 1.521 1.575 1.629

TA = -40°C to +85°C 1.346 1.388 1.429

I

T

A

= -40°C to +125°C 1.343 1.388 1.433

TA = -40°C to +85°C 1.271 1.313 1.354

H

T

A

= -40°C to +125°C 1.268 1.313 1.358

TA = -40°C to +85°C 1.077 1.110 1.143

G

T

A

= -40°C to +125°C 1.074 1.110 1.146

TA = -40°C to +85°C 1.017 1.050 1.083

F

T

A

= -40°C to +125°C 1.014 1.050 1.086

TA = -40°C to +85°C 0.808 0.833 0.858

E

T

A

= -40°C to +125°C 0.806 0.833 0.860

TA = -40°C to +85°C 0.762 0.788 0.813

V

CC2

Reset Threshold V

TH2

D

T

A

= -40°C to +125°C 0.761 0.788 0.815

V

Reset Threshold Temperature
Coefficient

60 ppm/°C

Reset Threshold Hysteresis 2 x V

TH

mV

TA = 0°C to +85°C 0.615 0.630 0.645

RESET IN Threshold V

RS T IN TH VRSTINTH

falling

T

A

= -40°C to +125°C 0.610 0.650

V

RESET IN Hysteresis 2.5 mV

TA = -40°C to +85°C -25 +25

RESET IN Input Current (Note 2) I

RSTIN

TA = -40°C to +125°C -100 +100

nA

VCC to Reset Output Delay t

RD

VCC = VTH to (VTH - 100mV) 20 µs

RESET IN to Reset Output Delay V

RSTIN

= V

RSTINTH

to (V

RSTINTH

- 30mV) 15 µs

TA = -40°C to +85°C 140 200 280

Reset Timeout Period t

RP

TA = -40°C to +125°C 100 320

ms

VCC ≥ 1.0V, I

SINK

= 50µA, reset asserted,

T

A

= 0°C to +85°C

0.3

VCC ≥ 1.2V, I

SINK

= 100µA, reset asserted 0.3

VCC ≥ 2.55V, I

SINK

= 1.2mA, reset asserted 0.3

RESET Output LOW
(Push-Pull or Open-Drain)

V

OL

VCC ≥ 4.25V, I

SINK

= 3.2mA, reset asserted 0.4

V

MAX6826–MAX6831

Dual Ultra-Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +4.5V to +5.5V for MAX68_ _L/M, VCC= +2.7V to +3.6V for MAX68_ _T/S/R, VCC= +2.1V to +2.75V for MAX68_ _Z/Y,
V

CC

= +1.53V to +2.0V for MAX68_ _W/V; TA= -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

C C

≥ 1.8V , I

S OURC E

= 200µA, reset not asser ted 0.8 ✕ V

C

C

V

C C

≥ 3.15V , I

S OURC E

= 500µA, reset not asser ted 0.8 ✕ V

C

C

RESET Output HIGH
(Push-Pull Only)

V

OH

V

C C

≥ 4.75V , I

S OURC E

= 800µA, reset not asser ted 0.8 ✕ V

C

C

V

Open-Drain RESET Output
Leakage Current (Note 1)

I

LKG

RESET not asserted 1.0 µA

VCC ≥ 1.0V, I

S OU RC E

= 1µA, reset asserted,

T

A

= 0°C to +85°C

0.8

✕

V

C C

V

C C

≥ 1.50V , I

S OU RC E

= 100µA, r eset asser ted 0.8 ✕ V

C C

V

C C

≥ 2.55V , I

S OU RC E

= 500µA, r eset asser ted 0.8 ✕ V

C C

RESET Output HIGH
(Push-Pull Only)

V

OH

V

C C

≥ 4.25V , I

S OU RC E

= 800µA, r eset asser ted 0.8 ✕ V

C C

V

V

C C

≥ 1.8V , I

S IN K

= 500µA, r eset asser ted 0.3

V

C C

≥ 3.15V , I

S IN K

= 1.2m A, r eset asser ted 0.3

RESET Output LOW
(Push-Pull Only)

V

OH

V

C C

≥ 4.75V , I

S IN K

= 3.2m A, r eset asser ted 0.3

V

MANUAL RESET INPUT

V

IL

0.3 ✕ V

C C

MR Input voltage

V

IH

0.7 ✕ V

C C

V

MR Minimum Input Pulse 1 µs
MR Glitch Rejection 100 ns
MR to Reset Delay 200 ns
MR Pullup Resistance 25 50 75 kΩ

WATCHDOG INPUT

TA = -40°C to +85°C 1.12 1.6 2.4

Watchdog Timeout Period t

WD

TA = -40°C to +125°C 0.80 2.60

s

WDI Pulse Width (Note 2) t

WDI

50 ns

V

IL

0.3 ✕ V

C C

WDI Input Voltage

V

IH

0.7 ✕ V

C C

V

WDI = VCC, time average 120 160

WDI Input Current I

WDI

WDI = 0, time average -20 -15

µA

Note 1: Over-temperature limits are guaranteed by design and not production tested. Devices tested at +25°C.
Note 2: Guaranteed by design and not production tested.