Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - system monitor Reset/power-on reset SOT 23-3

● Computers

● Controllers

● Intelligent Instruments

● Critical µP and µC

Power Monitoring

● Portable/Battery-

● Powered Equipment

● Bar-Code Scanners

General Description

The MAX6806/MAX6807/MAX6808 precision voltage

detectors are ideal for accurate monitoring of power

supplies in digital systems. They provide circuit reliability

and reduce total cost by eliminating external components

and adjustments.

The MAX6806/MAX6807/MAX6808 assert a reset signal

whenever the supply voltage (V

) falls below the factory-

preset, ±2% accurate threshold. Internal hysteresis

ensures stable switching. The MAX6806/MAX6807/

MAX6808 are available in 4.6V and 2.6V thresholds (2.3V

is also available for the MAX6806 only). The MAX6806

features an active-low, push-pull RESET output; the

MAX6807 features an active-high, push-pull RESET

output; and the MAX6808 features an active-low, open-

drain RESET output. RESET is valid for V

down to 1V

(MAX6806/MAX6808), and RESET (MAX6807) is guar-

anteed for V

down to 1.2V.

The MAX6806/MAX6807/MAX6808 are available in

3-pin SC70, 3-pin SOT23, 8-pin µMAX, 8-pin SO, and

4-pin SOT143 packages. The SOT143 package includes

a manual-reset input.

Applications

Features

● Preset Reset Thresholds: 4.6V and 2.6V

(2.3V also available for MAX6806 only)

● ±2% Accurate Reset Thresholds

● Reset Output Available in Active-Low (MAX6806),

Active-High (MAX6807), and Open-Drain (MAX6808)

Versions

● Immune to Power-Supply Transients

● RESET Valid to V

= 1.0V (MAX6806/MAX6808)

● 35µA Supply Current

● No External Components

● Manual Reset Available with 4-Pin SOT143 Package

● Miniature 3-Pin SC70, 3-Pin SOT23, and 4-Pin

SOT143 Packages

● 8-Pin µMAX and 8-Pin SO Packages are Pin

Compatible with the MC33064/MC33164/

MC34064/MC34164

* SOT23, SOT143, and SC70s are available in tape-and-reel

only, 2500 piece minimum order quantity.

Note: Insert the desired number from the Selector Guide into

the blank to complete the part number. Also see Selector Guide

for top mark for SOT23

PART TEMP. RANGE PIN-PACKAGE

MAX6806XR_ _ -T -40°C to +85°C 3 SC70

MAX6806UR_ _ -T -40°C to +85°C 3 SOT23

MAX6806US_ _ -T -40°C to +85°C 4 SOT143

MAX6806UA_ _ -40°C to +85°C 8 µMAX

MAX6806SA_ _ -40°C to +85°C 8 SO

MAX6807XR_ _ -T -40°C to +85°C 3 SC70

MAX6807UR_ _ -T -40°C to +85°C 3 SOT23

MAX6807US_ _ -T -40°C to +85°C 4 SOT143

MAX6807UA_ _ -40°C to +85°C 8 µMAX

MAX6807SA_ _ -40°C to +85°C 8 SO

MAX6808XR_ _ -T -40°C to +85°C 3 SC70

MAX6808UR_ _ -T -40°C to +85°C 3 SOT23

MAX6808US_ _ -T -40°C to +85°C 4 SOT143

MAX6808UA_ _ -40°C to +85°C 8 µMAX

MAX6808SA_ _ -40°C to +85°C 8 SO

MAX6806

MAX6807

MAX6808

GND GND

µP

(RESET)/RESET

RESET

INPUT

( ) ARE FOR MAX6807

MAX6806/MAX6807/

MAX6808

Voltage Detectors

19-1421; Rev 3; 7/14

Ordering Information

Typical Operating Circuit

Selector Guide and Pin Configurations appear at end of

data sheet.

Summary of content (9 pages)

PAGE 1
MAX6806/MAX6807/ MAX6808 Voltage Detectors General Description The MAX6806/MAX6807/MAX6808 precision voltage detectors are ideal for accurate monitoring of power supplies in digital systems. They provide circuit reliability and reduce total cost by eliminating external components and adjustments. The MAX6806/MAX6807/MAX6808 assert a reset signal whenever the supply voltage (VCC) falls below the factorypreset, ±2% accurate threshold. Internal hysteresis ensures stable switching.
PAGE 2
MAX6806/MAX6807/ MAX6808 Voltage Detectors Absolute Maximum Ratings VCC to GND .........................................................-0.3V to +6.0V RESET, RESET to GND (MAX6806/MAX6807) .............................. -0.3V to (VCC + 0.3V) RESET to GND (MAX6808).................................-0.3V to + 6.0V MR to GND (SOT143 package only)...................-0.3V to + 6.0V Input Current, VCC ...........................................................±20mA Output Current, RESET, RESET .................
PAGE 3
MAX6806/MAX6807/ MAX6808 Voltage Detectors Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE 35 41 VCC = 3.3V 30 25 VCC = 1.8V 20 15 10 0 -60 -30 0 30 60 90 39 37 35 33 31 29 VCC = 1.0V 5 VOD = VTH- - VCC = 100mV VCC FALLING AT 1mV/µS 43 27 25 120 -60 -45 -30 -15 0 15 30 45 60 75 90 105 120135 TEMPERATURE (°C) TEMPERATURE (°C) POWER-UP RESET DELAY vs. TEMPERATURE 11 DELAY TIME (µs) 10 1.
PAGE 4
MAX6806/MAX6807/ MAX6808 Voltage Detectors Detailed Description Manual-Reset Input Reset Output The MAX6806 voltage detector features an active-low, push-pull RESET output, while the MAX6807 features an active-high, push-pull RESET output. Unlike microprocessor (µP) supervisory circuits that offer a reset timeout period, the MAX6806 and MAX6807 RESET goes high and RESET goes low virtually immediately once VCC exceeds the reset threshold.
PAGE 5
MAX6806/MAX6807/ MAX6808 Voltage Detectors Applications Information Ensuring a Valid Reset Output Down to VCC = Ground Negative-Going VCC Transients In addition to asserting a reset signal during power-up, power-down, and brown-out conditions, the MAX6806/ MAX6807/MAX6808 are immune to short-duration, negative-going VCC transients. Figure 3 displays typical transient durations vs. reset-comparator overdrive for which the MAX6806/MAX6807/ MAX6808 do not generate a reset pulse.
PAGE 6
MAX6806/MAX6807/ MAX6808 Voltage Detectors Interfacing to µPs with Bidirectional Reset Pins µPs with bidirectional reset pins (such as the Motorola 68HC11 series) can contend with push-pull RESET outputs, resulting in indeterminate logic levels. Use the MAX6808 with the open-drain RESET when interfacing to this type of controller. VCC VCC VCC MAX6808 RESET GND 4.7kΩ µP RESET GND Figure 5.
PAGE 7
MAX6806/MAX6807/ MAX6808 Voltage Detectors Selector Guide (continued) TOP MARK NOMINAL VTH- (V) † MAX6807SA46 PART — 4.6 MAX6807SA26 — 2.6 MAX6807UA46 — 4.6 MAX6807UA26 — 2.6 FZDS 4.6 FZDT 2.6 MAX6807US46-T KABW 4.6 MAX6807US26-T KABX 2.6 MAX6807XR46-T AAD 4.6 MAX6807XR26-T MAX6807UR46-T MAX6807UR26-T RESET OUTPUT Active-High, Push-Pull AAE 2.6 MAX6808SA46 — 4.6 MAX6808SA32 — 3.2 MAX6808SA26 — 2.6 MAX6808UA46 — 4.6 MAX6808UA32 — 3.2 MAX6808UA26 — 2.
PAGE 8
MAX6806/MAX6807/ MAX6808 Voltage Detectors Pin Configurations TOP VIEW (RESET)/RESET 1 MAX6806 MAX6807 MAX6808 GND 2 SOT23/SC70 ( ) ARE FOR MAX6807 Chip Information TRANSISTOR COUNT: 72 (RESET)/RESET 3 1 VCC MAX6806 MAX6807 MAX6808 8 N.C. 7 N.C. VCC 2 N.C. 3 6 N.C. GND 4 5 N.C. (RESET)/RESET GND 3 VCC MAX6806 MAX6807 MAX6808 MR 2 SOT143 µMAX/SO Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.
PAGE 9
MAX6806/MAX6807/ MAX6808 Voltage Detectors Revision History REVISION NUMBER REVISION DATE 3 7/14 PAGES CHANGED DESCRIPTION No /V OPNs; removed Automotive reference from Applications section; updated Package Information 1, 9–13 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.