MAX6806UR23-MAX6808SA46+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX6806UR23 ,Voltage DetectorsApplicationsMAX6806XR_ _ -T -40°C to +85°C 3 SC70● Computers ● Portable/Battery-MAX6806UR_ _ -T -40 ..
MAX6806UR26-T ,Voltage DetectorsApplicationsPART TEMP. RANGE PIN-PACKAGEComputersMAX6806XR_ _-T -40°C to +85°C 3 SC70ControllersMAX ..
MAX6806US23-T ,Voltage DetectorsFeaturesThe MAX6806/MAX6807/MAX6808 precision voltage' Preset Reset Thresholds: 4.6V and 2.6V detec ..
MAX6807UR46-T ,Voltage detector. Reset output active-high, push-pull. Threshold reset 4.6VApplicationsPART TEMP. RANGE PIN-PACKAGEComputersMAX6806XR_ _-T -40°C to +85°C 3 SC70ControllersMAX ..
MAX6808SA46+ ,Voltage DetectorsElectrical Characteristics(V = +5V, T = -40°C to +85°C, unless otherwise noted. Typical values are ..
MAX680CPA ,+5V to 10V Voltage ConvertersMAX680/MAX68119-0896; Rev 1; 7/96+5V to ±10V Voltage Converters ________________
MB3782 ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27205-4EDATA SHEETASSP Power Supplies BIPOLARSwitching Regulator Controll ..
MB3782PF ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27205-4EDATA SHEETASSP Power Supplies BIPOLARSwitching Regulator Controll ..
MB3785A ,Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities)FUJITSU SEMICONDUCTORDS04-27208-1EDATA SHEETASSP BIPOLARSwitching Regulator Controller(4 Channels p ..
MB3785APFV ,Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities)FUJITSU SEMICONDUCTORDS04-27208-1EDATA SHEETASSP BIPOLARSwitching Regulator Controller(4 Channels p ..
MB3789 ,Switching Regulator Controller (Supporting External Synchronization)FUJITSU SEMICONDUCTORDS04-27211-3EDATA SHEETASSP For Power Supply
MB3789PFV ,Switching Regulator Controller (Supporting External Synchronization)FUJITSU SEMICONDUCTORDS04-27211-3EDATA SHEETASSP For Power Supply

MAX6806UR23-MAX6808SA46+
Voltage Detectors
●Computers●Controllers●Intelligent Instruments●Critical µP and µC Power Monitoring●Portable/Battery-●Powered Equipment●Bar-Code ScannersGeneral 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 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 VCC down to 1V
(MAX6806/MAX6808), and RESET (MAX6807) is guar-
anteed for VCC 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 VCC = 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
PARTTEMP. RANGEPIN-PACKAGE
MAX6806XR_ _ -T-40°C to +85°C3 SC70
MAX6806UR_ _ -T-40°C to +85°C3 SOT23
MAX6806US_ _ -T-40°C to +85°C4 SOT143
MAX6806UA_ _-40°C to +85°C8 µMAX
MAX6806SA_ _-40°C to +85°C8 SO
MAX6807XR_ _ -T-40°C to +85°C3 SC70
MAX6807UR_ _ -T-40°C to +85°C3 SOT23
MAX6807US_ _ -T-40°C to +85°C4 SOT143
MAX6807UA_ _-40°C to +85°C8 µMAX
MAX6807SA_ _-40°C to +85°C8 SO
MAX6808XR_ _ -T-40°C to +85°C3 SC70
MAX6808UR_ _ -T-40°C to +85°C3 SOT23
MAX6808US_ _ -T-40°C to +85°C4 SOT143
MAX6808UA_ _-40°C to +85°C8 µMAX
MAX6808SA_ _-40°C to +85°C8 SO
MAX6806
MAX6807
MAX6808
VCC
VCCVCC
GNDGND
(RESET)/RESETRESET
INPUT
( ) ARE FOR MAX6807
MAX6806/MAX6807/
MAX6808
Voltage Detectors
Ordering Information
Typical Operating Circuit
Selector Guide and Pin Configurations appear at end of
data sheet.
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 .....................................±20mA
Rate of Rise, VCC .........................................................100V/µs
Continuous Power Dissipation (TA = +70°C)SOT23, SOT143 (derate 4mW/°C above +70°C) ......320mWSC70 (derate 2.17mW/°C above +70vC) ...................174mWµMAX (derate 4.5mW/°C above +70°C) ....................362mWSO (derate 5.9mW/°C above +70°C) .........................471mW
Operating Temperature Range ..........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Note1: All devices are 100% production tested at TA = +25°C, and are guaranteed by design for TA = TMIN to TMAX, as specified.
Note 2: RESET output for MAX6806/MAX6808, RESET output for MAX6807.
(VCC = +5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply Voltage RangeVCC
TA = 0°C to +70°C1.05.5TA = -40°C to +85°C1.25.5
Supply CurrentICCVCC = +3.6V, no load3560µA
VCC = +5.5V, no load5080
Reset ThresholdVTH-TA = +25°C
VCC falling
MAX680_ _ _464.5084.604.692MAX680_ _ _323.1363.203.264
MAX680_ _ _262.5482.602.652
MAX680_ _ _232.2542.302.346
Reset Threshold HysteresisVHYSTTA = +25°C, Figure 20.02
VTH-
0.03
VTH-V
RESET Output Voltage
(MAX6806/MAX6808)
VOL
ISINK = 20µA, VCC = 1.0V0.3ISINK = 1.0mA, VCC = 2.0V0.4
VOHISOURCE = 2.0mA, VCC = 5.0V
(MAX6806 only)0.8 VCC
RESET Output Leakage CurrentIOHVCC = 5.5V, RESET deasserted
(MAX6808 only)1µA
RESET Output Voltage
(MAX6807)
VOHISOURCE = 20µA, VCC = 1.2V0.8 VCCISOURCE = 400µA, VCC = 2.0V0.8 VCC
VOLISINK = 3.2mA, VCC = 5.0V0.4
VCC to Reset Delay (Note 2)VCC falling at 1mV/µs30µs
Reset Threshold Tempco30ppm/°C
MR Pulldown ResistanceRMR4080120kΩ
MR Input Threshold
VIL
VCC > VTH+
0.6VIH0.7 VCC
MAX6806/MAX6807/
MAX6808
Voltage Detectors
Electrical Characteristics
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.
Absolute Maximum Ratings
(TA = +25°C, unless otherwise noted.)
PINNAMEFUNCTION
SOT23/SC70SOT143µMAX/SO11
RESETActive-Low Reset Output (MAX6806/MAX6808). RESET remains low
while VCC is below the reset-threshold voltage or while MR is held high.
RESETActive-High Reset Output (MAX6807). RESET remains high while VCC
is below the reset-threshold voltage or while MR is held high.44GNDGround32VCCSupply Voltage Input2—MRActive-High Manual Reset Input. Internal 80kΩ resistor to GND.
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX6806/7/8-04
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
VCC RISING (VTH+)
VCC FALLING (VTH-)
POWER-UP RESET DELAY
vs. TEMPERATURE
MAX6806/7/8-03
TEMPERATURE (°C)
DELAY TIME (
VOD = VCC - VTH+
VOD = 50mV
VOD = 200mV
VOD = 100mV
POWER-DOWN RESET DELAY
vs. TEMPERATURE
MAX6806/7/8toc02
TEMPERATURE (°C)
RESET DELAY (
VOD = VTH- - VCC = 100mV
VCC FALLING AT 1mV/µS
SUPPLY CURRENT
vs. TEMPERATURE
MAX6806/7/8-01
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = 5.0V
VCC = 3.3V
VCC = 1.8V
VCC = 1.0V
MAX6806/MAX6807/
MAX6808
Voltage Detectors
Pin Description
Typical Operating Characteristics
Detailed Description
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 micropro-
cessor (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. If a brownout occurs (VCC
falls below the reset threshold), RESET goes low and
RESET goes high. RESET is guaranteed to be a logic
low for VCC ≥ 1V and RESET is guaranteed to be a logic
high for VCC ≥ 1.2V.
The MAX6808 features an active-low, open-drain RESET
output. The output sinks current when VCC falls below
the reset threshold. Connect a pullup resistor from
RESET to any supply voltage up to 6V (Figure 1). Select
a resistor value large enough to provide a logic low and
small enough to provide a logic high while supplying all
input and leakage currents connected to the RESET
line. A 100kΩ resistor is sufficient in applications driving
high-impedance loads.
The manual reset input (MR, 4-pin SOT143 package) can
also initiate a reset (see Manual Reset Input section).
Manual-Reset Input
Many applications require manual-reset capabilities,
allowing an operator, a test technician, or external logic
circuitry to initiate a reset. A logic high on MR asserts
a reset and remains asserted while MR is high. This
input has an 80kΩ pulldown resistor, so the input can be
left unconnected if not used. Connect a normally open
momentary switch from MR to VCC to create a manu-
al-reset function. If MR is driven from long cables or if the
device is used in a noisy environment, connecting a 0.1µF
capacitor from MR to ground provides noise immunity.
Hysteresis
The MAX6806/MAX6807/MAX6808 feature internal
hysteresis that creates two trip points: one for the rising
supply voltage and one for the falling supply voltage
(Figure 2). The hysteresis prevents the output from
oscillating (chattering) when VCC is near the reset
threshold.
Reset Threshold Accuracy
The MAX6806/MAX6807/MAX6808 are ideal for
sys-tems using a 5V ±5%, 3V ±5%, or 2.5V ±5% power
supply with ICs specified for 5V ±10%, 3V ±10%, or
2.5V ±10%, respectively. The reset is guaranteed to
assert after the power supply falls out of regulation,
but before power drops below the minimum specified
oper-ating voltage range for the system ICs.
Figure 2. Input and Output Waveforms with VCC VariedFigure 1. The MAX6808 Open-Drain RESET Output Allows Use
with Multiple Supplies
VTH+
HYST
RESET
(MAX6806/MAX6808)
RESET
(MAX6807)
VHYST = VTH+ - VTH-
VOH
VOL
VOH
VOL
VTH-
MAX6808
VCCVCC
GND
+3.3V
GND
+5.0V
100kΩ5V SYSTEM
RESET
MAX6806/MAX6807/
MAX6808
Voltage Detectors
Applications Information
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, neg-
ative-going VCC transients.
Figure 3 displays typical transient durations vs. reset-com-
parator overdrive for which the MAX6806/MAX6807/
MAX6808 do not generate a reset pulse. The graph was
generated using a negative-going pulse applied to VCC,
starting 0.5V above the actual reset threshold and ending
below it by the magnitude indicated (reset-comparator
overdrive). The graph indicates the maximum pulse width
a negative-going VCC transient can have without causing
a reset pulse. As the magnitude of the transient increases
(goes further below the reset threshold), the maximum
allowable pulse width decreases. A 0.1µF capacitor
mounted as close as possible to VCC provides additional
transient immunity.
Ensuring a Valid Reset Output Down to
VCC = Ground
When VCC falls below 1V, the MAX6806/MAX6808
RESET output no longer sinks current—it becomes
an open circuit. Therefore, high-impedance CMOS
logic inputs connected to RESET can drift to
undetermined voltages. This presents no problem in most
applications, since most circuitry is inoperative when
VCC is below 1V. In applications where RESET must
be valid down to ground, add a pulldown resistor to
RESET so any stray leakage currents flow to ground,
holding RESET low (Figure 4). Select R1 to be large
enough not to load RESET and small enough to pull
RESET to ground. For most applications, 100kΩ will not
load RESET and will pull RESET to ground. Similarly,
if RESET (MAX6807) must be valid below 1.2V, add a
pullup resistor to RESET.
Figure 4. RESET / RESET Valid to VCC = Ground CircuitFigure 3. Maximum Transient Duration without Causing a Reset
Pulse vs. Reset Comparator Overdrive
MAX6806MAX6807
VCCVCC
GNDGND
RESETRESET
100kΩ
100kΩ1001000
RESET COMPARATOR OVERDRIVE, VTH- - VCC (mV)
MAXIMUM TRANSIENT DURATION (TA = +25°C
MAX680 46
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.
Figure 5. Interfacing to μPs with Bidirectional Reset I/O
PARTRESET OUTPUTTOP MARKNOMINAL VTH- (V)†
MAX6806SA46
Active-Low, Push-Pull4.6
MAX6806SA26 —2.6
MAX6806SA23 —2.3
MAX6806UA46 —4.6
MAX6806UA26 —2.6
MAX6806UA23 —2.3
MAX6806UR46-TFZDP4.6
MAX6806UR26-TFZDQ2.6
MAX6806UR23-TFZDR2.3
MAX6806US46-TKABT4.6
MAX6806US26-TKABU2.6
MAX6806US23-TKABV2.3
MAX6806XR46-TAAA4.6
MAX6806XR26-TAAB2.6
MAX6806XR23-TAAC2.3
MAX6808
VCC
VCC
VCC
GNDGND
4.7kΩµP
RESETRESET
MAX6806/MAX6807/
MAX6808
Voltage Detectors
Selector Guide

Partno	Mfg	Dc	Qty	Available	Descript
MAX6806UR23	MAXIM	N/a	443	avai	Voltage Detectors
MAX6808SA46+ \|MAX6808SA46	MAXIM	N/a	11	avai	Voltage Detectors