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PDF MAX6836 Data sheet ( Hoja de datos )
| Número de pieza | MAX6836 | |
| Descripción | Ultra-Low-Voltage SC70 Voltage Detectors and uP Reset Circuits | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
General Description
The MAX6832–MAX6840 are microprocessor (µP)
supervisory circuits used to monitor low-voltage power
supplies in µP and digital systems. They provide excel-
lent circuit reliability and low cost by eliminating exter-
nal components and adjustments when used with
+1.2V to +1.8V powered circuits.
These devices assert a reset signal whenever the VCC
supply voltage declines below a preset threshold or
whenever manual reset (MR) is asserted. Reset remains
asserted for a fixed timeout delay after VCC has risen
above the reset threshold or when manual reset is
deasserted. Five different timeout periods are available:
70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
The MAX6832/MAX6835/MAX6838 have a push-pull
active-low reset output (RESET). The MAX6833/
MAX6836/MAX6839 have a push-pull active-high reset
output (RESET) and the MAX6834/MAX6837/MAX6840
have an open-drain active-low reset output (RESET). The
open-drain active-low reset output requires a pullup resis-
tor that can be connected to a voltage higher than VCC.
The MAX6835/MAX6836/MAX6837 feature a debounced
manual reset input (MR), while the MAX6838/MAX6839/
MAX6840 provide a RESET-IN input allowing the user to
externally adjust the reset threshold. The reset compara-
tor is designed to ignore fast transients on VCC.
Low supply current of 7.5µA makes the MAX6832–
MAX6840 ideal for use in portable equipment. These
devices are available in 3- and 4-pin SC70 packages.
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Pin Configurations, Typical Operating Circuit, and Selector
Guide appear at end of data sheet.
Visit www.maximintegrated.com/products/patents for
product patent marking information.
Features
o Factory-Set Reset Threshold Voltages for
Nominal Supplies from 1.2V to 1.8V
o Low Power Consumption: 7.5µA (typ)
o Space-Saving 3- and 4-Pin SC70 Packages
o ±2.5% Reset Threshold Accuracy Over
Temperature
o Five Different Timeout Periods Available: 70µs
(voltage detector), 1.5ms, 30ms, 210ms, and 1.68s
o Three Reset Output Configurations
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
o Guaranteed Reset Valid to VCC =
0.55V—Active-Low
0.75V—Active-High
o Adjustable Threshold Reset-In Option
o Manual Reset Input Option
o Immune to Short Negative VCC Transients
o Pin Compatible with MAX803/MAX809/MAX810,
MAX6711/MAX6712/MAX6713, and
MAX6381–MAX6390 Series
Ordering Information
PART
MAX6832_XRD_-T
MAX6833_XRD_-T
MAX6834_XRD_-T
MAX6835_XSD_-T
MAX6836_XSD_-T
MAX6837_XSD_-T
MAX6838XSD_-T
MAX6839XSD_-T
MAX6840XSD_-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
3 SC70-3
3 SC70-3
3 SC70-3
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
Insert the desired suffix letter from the Threshold Suffix Guide
(MAX6832–MAX6837) and the Active Timeout Period Guide
tables into the blanks to complete the part number. Sample
stock is generally available on standard versions only (see
Standard Versions table). Standard versions require a minimum
order increment of 2.5k units. Nonstandard versions must be
ordered in 10k unit increments. Contact factory for availability.
All parts are offered in tape-and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-2242; Rev 2; 12/05
1 page  
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
MAX6833
SC70-3
1
PIN
MAX6832/
MAX6834
SC70-3
MAX6836
SC70-4
11
MAX6835/
MAX6837
SC70-4
1
— 2— 2
2—2—
—— 3
334
3
4
Pin Description—MAX6832–MAX6837
NAME
FUNCTION
GND
RESET
RESET
MR
VCC
Ground
Reset Output, Open-Drain or Push-Pull, Active-Low. RESET
changes from HIGH to LOW when VCC drops below the
selected reset threshold or MR is pulled low. RESET remains
LOW for the reset timeout period after VCC exceeds the device
reset threshold and MR is released high.
Reset Output, Push-Pull, Active-High. RESET changes from
LOW to HIGH when the VCC input drops below the selected
reset threshold or MR is pulled low. RESET remains HIGH for
the reset timeout period after VCC exceeds the device reset
threshold and MR is released high.
Active-Low Manual Reset Input. Internal 20kΩ pullup to VCC.
Pull LOW to force a reset. Reset remains active as long as MR is
LOW and for the reset timeout period after MR goes HIGH.
Leave unconnected or connect to VCC if unused.
Supply Voltage and Monitored Supply
Pin Description—MAX6838/MAX6839/MAX6840
PIN
MAX6839
SC70-4
MAX6838/
MAX6840
SC70-4
NAME
1 1 RESET-IN
2 2 VCC
3 3 GND
4 — RESET
— 4 RESET
FUNCTION
Adjustable Reset Threshold Input. High-impedance input for reset comparator. Connect
this pin to an external resistive-divider network to set the reset threshold voltage; the
typical threshold is 444mV. Reset is asserted when RESET-IN is below the threshold (VCC
is not monitored).
Supply Voltage (1.1V to 3.3V)
Ground
Reset Output, Push-Pull, Active-High. RESET changes from LOW to HIGH when the
RESET-IN input drops below the typical reset threshold (444mV). RESET remains HIGH for
the reset timeout period after RESET-IN exceeds the reset threshold.
Reset Output, Open-Drain or Push-Pull, Active-Low. RESET changes from HIGH to LOW
when RESET-IN drops below the typical reset threshold (444mV). RESET remains LOW for
the reset timeout period after RESET-IN exceeds the reset threshold.
Maxim Integrated
5
5 Page 
MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 ________________________________ 11
© 2005 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX6836.PDF ] | |
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