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PDF MAX6807 Data sheet ( Hoja de datos )
| Número de pieza | MAX6807 | |
| Descripción | Voltage Detectors | |
| Fabricantes | Maxim Integrated | |
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19-1421; Rev 2; 4/01
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 V CC down to 1V (MAX6806/
MAX6808), and RESET (MAX6807) is guaranteed for V CC
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
Computers
Automotive
Controllers
Bar-Code Scanners
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Selector Guide and Pin Configurations appear at end of data
sheet.
Typical Operating Circuit
VCC
VCC
VCC
MAX6806
MAX6807
MAX6808
(RESET)/RESET
µP
RESET
INPUT
GND GND
( ) ARE FOR MAX6807
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
o 8 Lead µMAX and 8 Lead SO Packages are Pin
Compatible with the MC33064/MC33164/
MC34064/MC34164
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
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
* 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
________________________________________________________________ Maxim Integrated Products 1
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.
http://www.Datasheet4U.com/
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 V CC,
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 V CC 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 V CC 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 V CC 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, 100k Ω 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
100kΩ
VCC
MAX6807
RESET
GND
R1
100kΩ
Figure 3. Maximum Transient Duration without Causing a
Reset Pulse vs. Reset Comparator Overdrive
Figure 4. RESET / RESET Valid to VCC = Ground Circuit
_______________________________________________________________________________________ 5
http://www.Datasheet4U.com/
5 Page 
Voltage Detectors
Package Information (continued)
______________________________________________________________________________________ 11
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11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX6807.PDF ] | |
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