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What is MAX6869?

This electronic component, produced by the manufacturer "Maxim Integrated", performs the same function as "(MAX6854 - MAX6869) Nanopower uP Supervisory Circuits".


MAX6869 Datasheet PDF - Maxim Integrated

Part Number MAX6869
Description (MAX6854 - MAX6869) Nanopower uP Supervisory Circuits
Manufacturers Maxim Integrated 
Logo Maxim Integrated Logo 


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19-3139; Rev 2; 9/04
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
General Description
The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–
MAX6869 ultra-low-current (170nA, typ) microprocessor
(µP) supervisory circuits combine voltage monitoring,
watchdog timer, and manual reset input functions in a 5-
pin SOT23 package. These devices assert a reset signal
whenever the monitored voltage drops below the factory-
trimmed reset threshold voltage, manual reset is assert-
ed, or the watchdog timer expires. The reset output
remains asserted for a minimum timeout period after VCC
rises above the reset threshold and manual reset is
deasserted. Factory-trimmed reset threshold voltages
are offered from +1.575V to +4.625V in approximately
100mV increments (see Threshold Suffix Guide). Each
device is offered with six minimum reset timeout options,
ranging from 10ms to 1200ms.
The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–
MAX6869 are offered in a variety of configurations (see
the Selector Guide). The MAX6854/MAX6855/MAX6856/
MAX6861–MAX6869 provide a manual reset input, MR.
The MAX6864–MAX6869 offer a watchdog timer that
monitors activity at the WDI input to prevent code execu-
tion errors. The MAX6864–MAX6869 offer watchdog
timeout options of 3.3s or 209s (typ). The MAX6861/
MAX6862/MAX6863 feature a pin-selectable reset delay
period of 10ms or 150ms (min). Push-pull active-low,
push-pull active-high, and open-drain active-low reset
outputs are available.
Applications
Portable/Battery-Powered Equipment
PDAs/Cell Phones
MP3 Players/Pagers
Glucose Monitors/Patient Monitors
VCC
MANUAL
RESET
Typical Operating Circuit
VCC
RESET
MAX6864
MAX6867
MR WDI
GND
0.1µF
VCC
RESET
µP
I/O
GND
Features
Ultra-Low 170nA (typ) Supply Current
Reset Thresholds from +1.575V to +4.625V in
Approximately 100mV Increments
Six Minimum Reset Timeout Period Options from
10ms to 1200ms
Manual Reset Option
Watchdog Timer Option
Pin-Selectable 10ms/150ms (min) Reset Timeout
Period (MAX6861/MAX6862/MAX6863)
Immune to Short VCC Transients
Guaranteed Reset Valid to VCC = +1.1V
Three Reset Output Options:
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
No External Components
Small 5-Pin SOT23 Package
Pin Compatible to the TPS3836/TPS3837/TPS3838
(MAX6861/MAX6862/MAX6863)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6854UK_ _D_-T
-40°C to +85°C 5 SOT23-5
MAX6855UK_ _D_-T
-40°C to +85°C 5 SOT23-5
Insert reset threshold suffix (see Table 2, Threshold Suffix
Guide) after UK. Insert the number corresponding to the
desired reset timeout period (see Table 4, Reset Timeout
Period) after D.
Note: Sample stock is generally held on standard versions
only (see Table 5, Standard Versions Table). Standard versions
have an order increment of 2500 pieces. Nonstandard versions
have an order increment of 10,000 pieces. Contact factory for
availability of nonstandard versions.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
Ordering Information continued at end of data sheet.
________________________________________________________________ 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.
Free Datasheet http://www.datasheet4u.com/

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MAX6869 equivalent
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
Typical Operating Characteristics (continued)
(VCC = +2.5V, TA = +25°C, unless otherwise noted.)
0.30
0.25
0.20
0.15
0.10
0.05
0
0
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
VCC = 1.8V
VCC = 2.5V
VCC = 3.3V
1000 2000 3000 4000 5000
ISINK (µA)
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
VCC = 2.5V
VCC = 1.8V
VCC = 3.3V
200 400 600 800 1000
ISOURCE (µA)
SUPPLY CURRENT vs. WATCHDOG
SWITCHING FREQUENCY
100
VCC = 2.5V
10
1
0.1
10 100 1k 10k 100k 1M 10M
WATCHDOG SWITCHING FREQUENCY (Hz)
VCC TO RESET DELAY
MAX6854 toc11
VCC
1.7V 200mV/div
VTH = 1.575V
1.5V
tRD
RESET
1V/div
0
10µs/div
MANUAL RESET DELAY
MAX6854 toc12
MR
tMRD 1V/div
200ns/div
RESET
1V/div
_______________________________________________________________________________________ 5
Free Datasheet http://www.datasheet4u.com/


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