Maxim MAX6717UKSVD3-T, MAX6726KARHD3-T Datasheet

General Description

The MAX6715–MAX6729 are ultra-low-voltage microprocessor (µP) supervisory circuits designed to monitor two or three system power-supply voltages. These devices assert a system reset if any monitored supply falls below its factorytrimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple supervisory circuits significantly improve system reliability and reduce size compared to separate ICs or discrete components.

These devices monitor primary supply voltages (VCC1) from

1.8V to 5.0V and secondary supply voltages (VCC2) from

0.9V to 3.3V with factory-trimmed reset threshold voltage options (see Reset Voltage Threshold Suffix Guide). An externally adjustable RSTIN input option allows customers to monitor a third supply voltage down to 0.62V. These devices are guaranteed to be in the correct reset output logic state when either VCC1 or VCC2 remains greater than 0.8V.

A variety of push-pull or open-drain reset outputs along with watchdog input, manual reset input, and power-fail input/output features are available (see Selector Guide). Select reset timeout periods from 1.1ms to 1120ms (min) (see Reset Timeout Period Suffix Guide). The MAX6715–MAX6729 are available in small 5, 6, and 8-pin SOT23 packages and operate over the -40°C to +85°C temperature range.

Applications

Multivoltage Systems

Telecom/Networking Equipment

Computers/Servers

Portable/Battery-Operated Equipment

Industrial Equipment

Printer/Fax

Set-Top Boxes

Features

♦ VCC1 (primary supply) Reset Threshold Voltages

from 1.58V to 4.63V

♦ VCC2 (secondary supply) Reset Threshold

Voltages from 0.79V to 3.08V

♦ Externally Adjustable RSTIN Threshold for

Auxiliary/Triple-Voltage Monitoring (0.62V internal reference)

♦ Watchdog Timer Option

35s (min) Long Startup Period

1.12s (min) Normal Timeout Period

♦ Manual Reset Input Option

♦ Power-Fail Input/Power-Fail Output Option

(Push-Pull and Open-Drain Active-Low)

♦ Guaranteed Reset Valid Down to VCC1 or

VCC2 = 0.8V

♦ Reset Output Logic Options

♦ Immune to Short VCCTransients

♦ Low Supply Current 14µA (typ) at 3.6V

♦ Small 5, 6, and 8-Pin SOT23 Packages

MAX6715–MAX6729

Dual/Triple Ultra-Low-Voltage SOT23 µP

Supervisory Circuits

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

OUT2

OUT1

DC/DC

CONVERTER

UNREGULATED

VCC1VCC2

RSTIN/PFI

RST

WDI

PFO

MAX67_ _

PUSHBUTTON

SWITCH

I/O

SUPPLY

CORE

SUPPLY

RESET

I/O

NMI

µP

1.8V 0.9V

Typical Operating Circuit

19-2325; Rev 3; 6/03

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.

Selector Guide appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX6715UT_ _D_ -T -40°C to +85°C 6 SOT23-6 MAX6716UT_ _D_ -T -40°C to +85°C 6 SOT23-6 MAX6717UK_ _D_ -T -40°C to +85°C 5 SOT23-5 MAX6718UK_ _D_ -T -40°C to +85°C 5 SOT23-5 MAX6719UT_ _D_ -T -40°C to +85°C 6 SOT23-6 MAX6720UT_ _D_ -T -40°C to +85°C 6 SOT23-6

Note: The first “_ _” are placeholders for the threshold voltage levels of the devices. Desired threshold levels are set by the part number suffix found in the Reset Voltage Threshold Suffix Guide. The “_” after the D is a placeholder for the reset timeout delay time. Desired delay time is set using the timeout period suffix found in the Reset Timeout Period Suffix Guide. For example the MAX6716UTLTD3-T is a dual-voltage supervisor V

1 = 4.625V,

2 = 3.075V, and 210ms (typ) timeout period.

Ordering Information continued at end of data sheet.

MAX6715–MAX6729

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0, TA= -40°C to +85°C, 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)

VCC1, VCC2 ..........................................................-0.3V to +6V

Open-Drain RST, RST1, RST2, PFO, RST ................-0.3V to +6V

Push-Pull RST, RST1, PFO, RST...............-0.3V to (V

1 + 0.3V)

Push-Pull RST2 .........................................-0.3V to (V

2 + 0.3V)

RSTIN, PFI, MR, WDI ................................................-0.3V to +6V

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

Continuous Power Dissipation (T

= +70°C)

5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) ........571mW

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage V

0.8 5.5 V

VCC1 < 5.5V, all I/O pins open 15 39

CC1

VCC1 < 3.6V, all I/O pins open 10 28

VCC2 < 3.6V, all I/O pins open 4 11

Supply Current

CC2

VCC2 < 2.75V, all I/O pins open 3 9

µA

L (falling) 4.500 4.625 4.750

M (falling) 4.250 4.375 4.500

T (falling) 3.000 3.075 3.150

S (falling) 2.850 2.925 3.000

R (falling) 2.550 2.625 2.700

Z (falling) 2.250 2.313 2.375

Y (falling) 2.125 2.188 2.250

W (falling) 1.620 1.665 1.710

VCC1 Reset Threshold V

TH1

V (falling) 1.530 1.575 1.620

T (falling) 3.000 3.075 3.150

S (falling) 2.850 2.925 3.000

R (falling) 2.550 2.625 2.700

Z (falling) 2.250 2.313 2.375

Y (falling) 2.125 2.188 2.250

W (falling) 1.620 1.665 1.710

V (falling) 1.530 1.575 1.620

I (falling) 1.350 1.388 1.425

H (falling) 1.275 1.313 1.350

G (falling) 1.080 1.110 1.140

F (falling) 1.020 1.050 1.080

E (falling) 0.810 0.833 0.855

VCC2 Reset Threshold V

TH2

D (falling) 0.765 0.788 0.810

Reset Threshold Tempco 20 ppm/°C

Reset Threshold Hysteresis V

HYST

Referenced to VTH typical 0.5 %

MAX6715–MAX6729

Dual/Triple Ultra-Low-Voltage SOT23 µP

Supervisory Circuits

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VCC to Reset Output Delay t

C C

1 = ( V

1 + 100m V ) to ( V

1 - 100m V ) or

C C

2 = ( V

2 + 75m V ) to ( V

2 - 75m V )

20 µs

D1 1.1 1.65 2.2

D2 8.8 13.2 17.6

D3 140 210 280

D5 280 420 560

D6 560 840 1120

Reset Timeout Period t

D4 1120 1680 2240

ADJUSTABLE RESET COMPARATOR INPUT (MAX6719/MAX6720/MAX6723–MAX6727)

RSTIN Input Threshold V

RSTIN

611 626.5 642 mV

RSTIN Input Current I

RSTIN

-25 +25 nA

RSTIN Hysteresis 3mV

RSTIN to Reset Output Delay t

RSTINDVRSTIN

to (V

RSTIN

- 30mV) 22 µs

POWER-FAIL INPUT (MAX6728/MAX6729)

PFI Input Threshold V

PFI

611 626.5 642 mV

PFI Input Current I

PFI

-25 +25 nA

PFI Hysteresis V

PFH

3mV

PFI to PFO Delay t

DPF

PFI

+ 30mV) to (V

PFI

- 30mV) 2 µs

MANUAL RESET INPUT (MAX6715–MAX6722/MAX6725–MAX6729)

0.3 ✕ VCC1

MR Input Voltage

0.7 ✕ VCC1

MR Minimum Pulse Width 1µs MR Glitch Rejection 100 ns MR to Reset Delay t

200 ns

MR Pullup Resistance 25 50 80 kΩ

WATCHDOG INPUT (MAX6721–MAX6729)

First watchdog period after reset timeout period

35 54 72

Watchdog Timeout Period t

Normal mode 1.12 1.68 2.24

WDI Pulse Width t

WDI

(Note 2) 50 ns

0.3 ✕ VCC1

WDI Input Voltage

0.7 ✕ VCC1

WDI Input Current I

WDI

WDI = 0 or VCC1-1+1µA

MAX6715–MAX6729

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits

4 _______________________________________________________________________________________

Note 1: Devices tested at +25°C. Overtemperature limits are guaranteed by design and not production tested. Note 2: Parameter guaranteed by design.

ELECTRICAL CHARACTERISTICS (continued)

(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

RESET/POWER-FAIL OUTPUTS

VCC1 or VCC2 ≥ 0.8V, I

SINK

= 1µA,

output asserted

0.3

VCC1 or VCC2 ≥ 1.0V, I

SINK

= 50µA,

output asserted

0.3

VCC1 or VCC2 ≥ 1.2V, I

SINK

= 100µA,

output asserted

0.3

VCC1 or VCC2 ≥ 2.7V, I

SINK

= 1.2mA,

output asserted

0.3

RST/RST1/RST2/PFO Output LOW (Push-Pull or Open-Drain)

VCC1 or VCC2 ≥ 4.5V, I

SINK

= 3.2mA,

output asserted

0.4

VCC1 ≥ 1.8V, I

SOURCE

= 200µA, output not

asserted

0.8

✕ V

VCC1 ≥ 2.7V, I

SOURCE

= 500µA, output not

asserted

0.8

✕ V

RST/RST1/PFO Output HIGH (Push-Pull Only)

VCC1 ≥ 4.5V, I

SOURCE

= 800µA, output not

asserted

0.8

✕ V

VCC2 ≥ 1.8V, I

SOURCE

= 200µA, output not

asserted

0.8

✕ V

VCC2 ≥ 2.7V, I

SOURCE

= 500µA, output not

asserted

0.8

✕ V

RST2

Output HIGH (Push-Pull Only)

VCC2 ≥ 4.5V, I

SOURCE

= 800µA, output not

asserted

0.8

✕ V

VCC1 ≥ 1.0V, I

SOURCE

= 1µA, reset asserted 0.8 ✕ VCC1

VCC1 ≥ 1.8V, I

SOURCE

= 150µA,

reset asserted

0.8

✕ V

VCC1 ≥ 2.7V, I

SOURCE

= 500µA,

reset asserted

0.8

✕ V

RST Output HIGH (Push-Pull Only)

VCC1 ≥ 4.5V, I

SOURCE

= 800µA,

reset asserted

0.8

✕ V

VCC1 or VCC2 ≥ 1.8V, I

SINK

= 500µA,

reset not asserted

0.3

VCC1 or VCC2 ≥ 2.7V, I

SINK

= 1.2mA,

reset not asserted

0.3

RST Output LOW (Push-Pull or Open Drain)

VCC1 or VCC2 ≥ 4.5V, I

SINK

= 3.2mA,

reset not asserted

0.4

RST/RST1/RST2/PFO Output Open-Drain Leakage Current

Output not asserted 0.5 µA

RST Output Open-Drain Leakage Current

Output asserted 0.5 µA

MAX6715–MAX6729

Dual/Triple Ultra-Low-Voltage SOT23 µP

Supervisory Circuits

_______________________________________________________________________________________ 5

-40 10-15 356085

SUPPLY CURRENT vs. TEMPERATURE

1 = 5V, VCC2 = 3.3V

MAX6715-29 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

TOTAL

ICC1

ICC2

-40 10-15 356085

SUPPLY CURRENT vs. TEMPERATURE

1 = 3.3V, VCC2 = 2.5V

MAX6715-29 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

TOTAL

ICC1

ICC2

-40 10-15 356085

SUPPLY CURRENT vs. TEMPERATURE

1 = 2.5V, VCC2 = 1.8V

MAX6715-29 toc03

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

TOTAL

ICC1

ICC2

-40 10-15 356085

SUPPLY CURRENT vs. TEMPERATURE

1 = 1.8V, VCC2 = 1.2V

MAX6715-29 toc04

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

TOTAL

ICC1

ICC2

0.998

1.000

0.999

1.003

1.002

1.001

1.006

1.005

1.004

1.007

-40 10-15 356085

NORMALIZED RESET/WATCHDOG

TIMEOUT PERIOD vs. TEMPERATURE

MAX6715-29 toc05

TEMPERATURE (°C)

RESET/WATCHDOG PERIOD

10,000

1000

100

110010 1000

MAXIMUM VCC TRANSIENT DURATION

vs. RESET THRESHOLD OVERDRIVE

MAX6715-29 toc06

RESET THRESHOLD OVERDRIVE (mV)

MAXIMUM V

TRANSIENT DURATION (µs)

RESET OCCURS ABOVE

THIS LINE

0.996

0.997

0.998

0.999

1.000

1.001

1.002

1.003

1.004

-40 -15 10 35 60 85

NORMALIZED VCC RESET THRESHOLD

vs. TEMPERATURE

MAX6715-29 toc07

TEMPERATURE (°C)

RESET THRESHOLD

625

627

626

629

628

630

631

-40 85

RESET INPUT AND POWER-FAIL INPUT

THRESHOLD vs. TEMPERATURE

MAX6715-29 toc08

TEMPERATURE (°C)

THRESHOLD (mV)

10-15 35 60

-40 10-15 35 60 85

VCC TO RESET DELAY

vs. TEMPERATURE

MAX6715-29 toc09

TEMPERATURE (°C)

TO RESET DELAY (µs)

100mV OVERDRIVE

Typical Operating Characteristics

(VCC1 = 5V, VCC2 = 3.3V, TA= +25°C, unless otherwise noted.)

MAX6715–MAX6729

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits

6 _______________________________________________________________________________________

Pin Description

22.8

23.0

23.2

23.4

23.6

23.8

24.0

24.2

24.4

-40 -15 10 35 60 85

RESET INPUT TO RESET OUTPUT DELAY

vs. TEMPERATURE

MAX6715-29 toc10

TEMPERATURE (°C)

RSTIN TO RESET DELAY (µs)

30mV OVERDRIVE

2.0

2.1

2.2

2.4

2.3

-40 10-15 35 60 85

POWER-FAIL INPUT TO POWER-FAIL

OUTPUT DELAY vs. TEMPERATURE

MAX6715-29 toc11

TEMPERATURE (°C)

RSTIN TO RESET DELAY (µs)

30mV OVERDRIVE

RST

2V/div

MAX6715-29 toc12

50ns/div

MR TO RESET OUTPUT DELAY

2V/div

Typical Operating Characteristics (continued)

(VCC1 = 5V, VCC2 = 3.3V, TA= +25°C, unless otherwise noted.)

MAX6715/

MAX6716

MAX6717/

MAX6718

MAX6719/

MAX6720

MAX6721/

MAX6722

MAX6723/

MAX6724

MAX6725/

MAX6726

MAX6727

MAX6728/

MAX6729

NAME FUNCTION

1111111, 41

RST/ RST1

Active-Low Reset Output, Open-Drain or Push-Pull. RST/RST1 changes from high to low when V

1 or

2 drops below the selected reset thresholds, RSTIN is below threshold, MR is pulled low, or the watchdog triggers a reset. RST/RST1 remains low for the reset timeout period after V

2/RSTIN exceed the device reset thresholds, MR goes low to high, or the watchdog triggers a reset. Open-drain outputs require an external pullup resistor. Push-pull outputs are referenced to V

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