MAX6841 MAXIM [Maxim Integrated Products], MAX6841 Datasheet

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MAX6841

Manufacturer Part Number
MAX6841
Description
Ultra-Low-Voltage uP Reset Circuits and Voltage Detectors
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
The MAX6841–MAX6845 microprocessor (µP) supervi-
sory circuits monitor ultra-low-voltage power supplies in
µP and digital systems. They provide excellent circuit
reliability at low cost by eliminating external compo-
nents and adjustments when used with +0.9V to +1.5V
systems. Factory-trimmed reset thresholds are avail-
able for the MAX6841/MAX6842. The MAX6843/
MAX6844/MAX6845 provide a RESET IN input, allowing
the user to externally adjust the reset threshold. The
MAX6841–MAX6845 family features a debounced man-
ual reset input (MR). The reset comparator is designed
to ignore fast transients on V
The MAX6841–MAX6845 assert a reset signal whenev-
er the V
adjustable threshold or whenever manual reset (MR) is
asserted. Reset remains asserted for a fixed timeout
delay after V
when manual reset is deasserted. Five timeout periods
are available for each part: 150µs (voltage detector ver-
sion), 1.5ms, 30ms, 210ms, and 1.68s (typ).
The MAX6841/MAX6843 have an active-low push-pull
reset output. The MAX6841/MAX6842/MAX6844 have
an active-high push-pull reset output, and the
MAX6842/MAX6845 have an active-low open-drain
reset output. The active-low open-drain reset output
requires a pullup resistor that can be connected to a
voltage from 0 to V
The low supply current (5.7µA) and small package
(SOT23-5) make the MAX6841–MAX6845 ideal for use
in portable equipment.
19-2625; Rev 1; 2/03
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
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.
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Telecom/Networking Equipment
Basestations
Servers/Workstations
CC
supply voltage declines below a preset or
CC
has risen above the reset threshold and
________________________________________________________________ Maxim Integrated Products
Ultra-Low-Voltage µP Reset Circuits and
CC
.
General Description
CC
.
Applications
o Factory-Set Reset Threshold Voltages for
o Adjustable Threshold RESET IN
o Low Power Consumption: 5.7µA (typ)
o ±2.5% Reset Threshold Accuracy
o Five Timeout Periods: 150µs (Voltage Detector
o Available in Three Output Configurations
o Guaranteed Reset Valid to V
o Manual Reset Input
o Immune to Short V
o Space-Saving 5-Pin SOT23 Package
Note: Insert desired suffix letter (from the Threshold Suffix Guide
and the Active Timeout Period tables) into the blanks to com-
plete the part number. For example, the MAX6842GUKD1 has a
reset threshold of 1.11V and a typical reset timeout period of
1.5ms. Sample stock is generally available on standard versions
only (see the 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.
MAX6841_UKD_-T
MAX6842_UKD_-T
MAX6843UKD_-T
MAX6844UKD_-T
MAX6845UKD_-T
Monitoring Supplies from 0.9V to 1.5V
(MAX6841/MAX6842)
(MAX6843/MAX6844/MAX6845)
Over Temperature
Version), 1.5ms, 30ms, 210ms, and 1.68s
(Active Low)
TOP VIEW
RESET
RESET
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
GND
PART
1
2
3
Voltage Detectors
SOT23-5
MAX6841
MAX6842
5 V
4
Ordering Information
CC
-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
TEMP RANGE
MR
CC
Transients
Pin Configurations
RESET IN
(RESET)
RESET
GND
CC
1
2
3
= 0.55V
( ) ARE FOR 6844
SOT23-5
MAX6843
MAX6844
MAX6845
PIN-PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
Features
5 V
4
MR
CC
1

Related parts for MAX6841

MAX6841 Summary of contents

Page 1

... The active-low open-drain reset output requires a pullup resistor that can be connected to a voltage from The low supply current (5.7µA) and small package (SOT23-5) make the MAX6841–MAX6845 ideal for use in portable equipment. Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring ...

Page 2

... SOT23 (derate 7.1mW/°C above +70°C)............571mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C + 0.3V) CC Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C CONDITIONS MAX6843/MAX6845 CC MAX6841/MAX6842/MAX6844 (Note 0.9V, no load, reset not asserted 1.5V, no load, reset not asserted ...

Page 3

... SOURCE asserted V OH ≥ 0.83V 40µA, reset CC SOURCE asserted ≥ 0.83V 80µA, reset not CC SINK V OL asserted = 0.55V (MAX6841/MAX6842). CC(MIN) > 0.833V -40°C to +85° Typical Operating Characteristics POWER-DOWN RESET DELAY vs. TEMPERATURE 350 300 V = 10mV OD 250 V = 20mV OD 200 ...

Page 4

... TEMPERATURE (°C) Push-Pull (MAX6841) or Open-Drain (MAX6842) Active-Low Reset Output. RESET changes from high to low when pulled low. RESET remains low for the reset timeout period after V exceeds the device reset threshold and MR is released high. Push-Pull (MAX6843) or Open-Drain (MAX6845) Active-Low Reset Output. RESET changes from high to low when RESET IN drops below the 187 ...

Page 5

... TIMEOUT PERIOD GND Detailed Description A microprocessor’s (µP’s) reset input starts the µ known state. The MAX6841–MAX6845 assert a reset dur- ing power-up, power-down, and brownout conditions. When the V supply voltage falls below a preset thresh- CC old (MAX6841/MAX6842) or RESET IN falls below the ...

Page 6

... CC-TH 100kΩ, then R1 = 26.3kΩ. Applications Information V Falling Transients CC The MAX6841–MAX6845 are relatively immune to short- duration falling V transients (glitches). Figure 2 CC shows typical transient duration vs. reset comparator overdrive, for which the MAX6841–MAX6845 do not generate a reset pulse. The graph was generated using a falling pulse applied starting 0 ...

Page 7

... V CC µP RESET GND Table 2. Active Timeout Period Guide SUFFIX Table 3. Standard Versions DEVICE CC MAX6841HUKD0 MAX6841HUKD3 MAX6841FUKD0 MAX6841FUKD3 MAX6841DUKD0 MAX6841DUKD3 MAX6842HUKD0 MAX6842HUKD3 MAX6842FUKD0 MAX6842FUKD3 MAX6842DUKD0 MAX6842DUKD3 MAX6843UKD0 MAX6843UKD3 MAX6844UKD0 MAX6844UKD3 MAX6845UKD0 MAX6845UKD3 Voltage Detectors RESET THRESHOLD (V) I 1.388 H 1.313 G 1 ...

Page 8

... Ultra-Low-Voltage µP Reset Circuits and Voltage Detectors PART MANUAL RESET ✔ MAX6841 ✔ MAX6842 ✔ MAX6843 ✔ MAX6844 ✔ MAX6845 Typical Operating Circuit V IN 3.3V 0.9V DC/DC CONVERTER V CC MAX6842D/E RESET PUSHBUTTON MR RESET SWITCH GND 8 _______________________________________________________________________________________ ADJUSTABLE PUSH-PULL RESET RESET INPUT ✔ — — ...

Page 9

Ultra-Low-Voltage µP Reset Circuits and (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other than circuitry ...

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