Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - system monitor Dual voltage detector SOT 23 5

General Description

The MAX6715–MAX6729 are ultra-low-voltage microproces-

sor (µP) supervisory circuits designed to monitor two or three

system power-supply voltages. These devices assert a sys-

tem reset if any monitored supply falls below its factory-

trimmed or adjustable threshold and maintain reset for a

minimum timeout period after all supplies rise above their

thresholds. The integrated dual/triple supervisory circuits sig-

nificantly improve system reliability and reduce size com-

pared to separate ICs or discrete components.

These devices monitor primary supply voltages (V

1) from

1.8V to 5.0V and secondary supply voltages (V

2) 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 V

1 or V

2 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/out-

put 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 oper-

ate 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

♦ V

1 (primary supply) Reset Threshold Voltages

from 1.58V to 4.63V

♦ V

2 (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 V

1 or

2 = 0.8V

♦ Reset Output Logic Options

♦ Immune to Short V

Transients

♦ 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

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 5; 12/05

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 and Selector Guide appear 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.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing "-T" with "+T" when ordering.

Ordering Information continued at end of data sheet.

Summary of content (19 pages)

PAGE 1
9-2325; Rev 5; 12/05 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits 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.
PAGE 2
MAX6715–MAX6729 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits ABSOLUTE MAXIMUM RATINGS 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 (VCC1 + 0.3V) Push-Pull RST2 .........................................-0.3V to (VCC2 + 0.3V) RSTIN, PFI, MR, WDI ................................................-0.
PAGE 3
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits (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 VCC to Reset Output Delay SYMBOL tRD CONDITIONS tRP TYP VCC1 = (VTH1 + 100mV) to (VTH1 - 100mV) or VCC2 = (VTH2 + 75mV) to (VTH2 - 75mV) D1 Reset Timeout Period MIN MAX 20 UNITS µs 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 D4 1120 1680 2240 626.
PAGE 4
MAX6715–MAX6729 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits 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.
PAGE 5
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits ICC1 12 10 8 6 ICC2 4 10 8 ICC1 6 16 14 12 8 -15 10 35 60 85 ICC1 6 4 ICC2 ICC2 2 0 -40 TOTAL 10 2 0 0 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) SUPPLY CURRENT vs. TEMPERATURE VCC1 = 1.8V, VCC2 = 1.2V NORMALIZED RESET/WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE MAXIMUM VCC TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE 12 10 TOTAL 8 6 ICC1 4 2 ICC2 1.
PAGE 6
Typical Operating Characteristics (continued) (VCC1 = 5V, VCC2 = 3.3V, TA = +25°C, unless otherwise noted.) RESET INPUT TO RESET OUTPUT DELAY vs. TEMPERATURE POWER-FAIL INPUT TO POWER-FAIL OUTPUT DELAY vs. TEMPERATURE MR TO RESET OUTPUT DELAY 24.0 23.8 23.6 23.4 23.2 2.4 MAX6715-29 toc11 24.2 30mV OVERDRIVE RSTIN TO RESET DELAY (µs) 30mV OVERDRIVE MAX6715-29 toc10 MAX6715-29 toc12 24.
PAGE 7
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits PIN MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6723/ MAX6725/ MAX6728/ NAME MAX6727 MAX6716 MAX6718 MAX6720 MAX6722 MAX6724 MAX6726 MAX6729 FUNCTION 5 — — — — — — — RST2 Active-Low Reset Output, Open-Drain or Push-Pull. RST2 changes from high to low when VCC1 or VCC2 drops below the selected reset thresholds or MR is pulled low.
PAGE 8
MAX6715–MAX6729 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits Pin Description (continued) PIN MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6723/ MAX6725/ MAX6728/ NAME MAX6727 MAX6716 MAX6718 MAX6720 MAX6722 MAX6724 MAX6726 MAX6729 — — — 8 — — — — 5 — 5 — — 3 5 — 3 7 — 3 7 — 3 — 7 FUNCTION WDI Watchdog Input.
PAGE 9
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits PIN MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6723/ MAX6725/ MAX6728/ NAME MAX6727 MAX6716 MAX6718 MAX6720 MAX6722 MAX6724 MAX6726 MAX6729 — — — — — — — — — — Detailed Description Supply Voltages The MAX6715–MAX6729 microprocessor (µP) supervisory circuits maintain system integrity by alerting the µP to fault conditions. These ICs are optimized for systems that monitor two or three supply voltages.
PAGE 10
MAX6715–MAX6729 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits restarts. The MAX6715/MAX6717/MAX6719/MAX6721/ MAX6723/MAX6725/MAX6727/MAX6728 contain opendrain reset outputs, while the MAX6716/MAX6718/ MAX6720/MAX6722/MAX6724/MAX6726/MAX6729 contain push-pull reset outputs. The MAX6727 provides two separate open-drain RST outputs driven by the same internal logic.
PAGE 11
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits RESET TO OTHER SYSTEM COMPONENTS VCC1 VCC2 VIN MAX6728/ MAX6729 R1 VTRIP = VPFI PFI ( R1R2+ R2 ) MAX6715– MAX6729 PFO µP 4.7kΩ VCC2 R2 RST RESET VCC1 GND GND GND B VCC MAX6728/ MAX6729 R1 PFI Figure 4. Interfacing to µPs with Bidirectional Reset I/O PFO [ ( VTRIP = R2 (VPFI) ) 1 + 1 - VCC R1 R2 R1 ] VPFI = 626.5mV R2 VIN GND Figure 3.
PAGE 12
MAX6715–MAX6729 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits R3 START A VIN VEXT VGOOD VFAIL PFO MAX6728/ MAX6729 SET WDI HIGH R1 PFI PROGRAM CODE PFO R2 GND VGOOD = DESIRED VEXT GOOD VOLTAGE THRESHOLD VFAIL = DESIRED VEXT FAIL VOLTAGE THRESHOLD VOH = VCC1 (FOR PUSH-PULL PFO) R2 = 200kΩ (FOR > 2.5µA R2 CURRENT) R1 = R2 ((VGOOD - VPFI) - (VPFI)(VGOOD - VFAIL) / VOH) / VPFI R3 = (R1 x VOH) / (VGOOD - VFAIL) Figure 5.
PAGE 13
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits VCC1 VCC1 MR MR PULLUP VCC1 VCC1 VCC2 VREF RESET TIMEOUT PERIOD VCC2 RST RESET OUTPUT DRIVER RST RSTIN/PFI PFO VCC1 VREF VCC1 WATCHDOG TIMER WDI VREF/2 ______________________________________________________________________________________ 13 MAX6715–MAX6729 Functional Diagram
PAGE 14
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits MAX6715–MAX6729 Selector Guide PART NUMBER NUMBER OF VOLTAGE MONITORS OPENDRAIN RESET OPENDRAIN RESET PUSHPULL RESET PUSHPULL RESET MANUAL RESET WATCHDOG INPUT POWERFAIL INPUT/ OUTPUT MAX6715 2 2 — — — √ — — MAX6716 2 — — 2 — √ — — MAX6717 2 1 — — — √ — — MAX6718 2 — — 1 — √ — — MAX6719 3 1 — — — √ — — MAX6720 3 — — 1 — √ — — MAX6721 2 1 — — — √ √ — MAX6722 2 — — 1 — √
PAGE 15
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits Table 2. Reset Timeout Period Suffix Guide ACTIVE TIMEOUT PERIOD PART NUMBER SUFFIX (_ _) VCC1 NOMINAL VOLTAGE THRESHOLD (V) VCC2 NOMINAL VOLTAGE THRESHOLD (V) TIMEOUT PERIOD SUFFIX MIN [ms] D1 1.1 2.2 LT 4.625 3.075 D2 8.8 17.6 280 MAX [ms] MS 4.375 2.925 D3 140 MR 4.375 2.625 D5 280 560 TZ 3.075 2.313 D6 560 1120 SY 2.925 2.188 D4 1120 2240 RY 2.625 2.188 TW 3.075 1.665 SV 2.925 1.575 RV 2.625 1.
PAGE 16
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits MAX6715–MAX6729 Pin Configurations TOP VIEW RST1 1 GND 2 MAX6715/ MAX6716 MR 3 6 VCC1 RST 1 5 RST2 GND 2 4 VCC2 MR 3 SOT23 VCC1 MAX6717/ MAX6718 MAX6721/ MAX6722 MR 3 6 VCC1 RST 1 5 WDI GND 2 4 VCC2 WDI 3 SOT23 MAX6719/ MAX6720 GND 2 VCC2 4 MR 3 MAX6723/ MAX6724 6 VCC1 5 RSTIN 4 VCC2 RST 1 GND 2 1 GND 2 8 VCC1 RST 1 7 RSTIN GND 2 6 VCC2 WDI RST 4 5 MR PFO 4 SOT23 5 RSTIN 4 VCC2 WDI
PAGE 17
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits SOT-23 5L .EPS PACKAGE OUTLINE, SOT-23, 5L 21-0057 E 1 1 ______________________________________________________________________________________ 17 MAX6715–MAX6729 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.
PAGE 18
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 6LSOT.
PAGE 19
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits CL E MIN MAX A A1 A2 0.90 0.00 0.90 1.45 0.15 1.30 b 0.28 0.45 C D E 0.09 2.80 2.60 0.20 3.00 3.00 SYMBOL e CL CL E1 E1 1.50 L 0.30 L2 e PIN 1 I.D. DOT (SEE NOTE 6) SOT23, 8L .EPS SEE DETAIL "A" b 1.75 0.60 0.25 BSC. 0.65 BSC. 1.95 REF. 0∞ 8∞ e1 0 e1 D C CL L2 A A2 GAUGE PLANE A1 SEATING PLANE C 0 L NOTE: 1. ALL DIMENSIONS ARE IN MILLIMETERS. 2.