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PDF MAX6806 Data sheet ( Hoja de datos )
| Número de pieza | MAX6806 | |
| Descripción | Voltage Detectors | |
| Fabricantes | Maxim Integrated | |
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19-1421; Rev 1; 4/99
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 reliabili-
ty and reduce total cost by eliminating external compo-
nents 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 fea-
tures 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 out-
put. RESET is valid for VCC down to 1V (MAX6806/
MAX6808), and RESET (MAX6807) is guaranteed for VCC
down to 1.2V.
The MAX6806/MAX6807/MAX6808 are available in
3-pin SC70, 3-pin SOT23, and 4-pin SOT143 packages.
The SOT143 package includes a manual-reset input.
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Bar-Code Scanners
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
Features
o Preset Reset Thresholds: 4.6V and 2.6V
(2.3V also available for MAX6806 only)
o ±2% Accurate Reset Thresholds
o Reset Output Available in Active-Low (MAX6806),
Active-High (MAX6807), and Open-Drain
(MAX6808) Versions
o Immune to Power-Supply Transients
o RESET Valid to VCC = 1.0V (MAX6806/MAX6808)
o 35µA Supply Current
o No External Components
o Manual Reset Available with 4-Pin SOT143
Package
o Miniature 3-Pin SC70, 3-Pin SOT23, and 4-Pin
SOT143 Packages
Ordering Information
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
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
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
* All devices available in tape-and-reel only, 2500 piece mini-
mum 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.
Selector Guide
PART
RESET OUTPUT
MAX6806UR46-T
MAX6806UR26-T
MAX6806UR23-T
MAX6806US46-T
Active-Low, Push-Pull
MAX6806US26-T
MAX6806US23-T
† Other reset thresholds may be available. Contact factory for availability.
Selector Guide continued at end of data sheet.
TOP MARK
FZDP
FZDQ
FZDR
KABT
KABU
KABV
NOMINAL
VTH- (V)†
4.6
2.6
2.3
4.6
2.6
2.3
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
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-
comparator 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 end-
ing below it by the magnitude indicated (reset-compara-
tor 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 pro-
vides 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 applica-
tions, since most circuitry is inoperative when VCC is
below 1V. In applications where RESET must be valid
down to ground, add a pull-down 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
pull-up resistor to RESET.
80
TA = +25°C
70
60
50
40
MAX680 46
30
20
10
100 1000
RESET COMPARATOR OVERDRIVE, VTH- - VCC (mV)
VCC
MAX6806
RESET
GND
R1
100k
VCC
MAX6807
RESET
R1
100k
GND
Figure 3. Maximum Transient Duration without Causing a
Reset Pulse vs. Reset Comparator Overdrive
Figure 4. RESET / RESET Valid to VCC = Ground Circuit
_______________________________________________________________________________________ 5
5 Page 
Voltage Detectors
NOTES
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX6806.PDF ] | |
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