MAX6342SUT Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Ultra-Small, Adjustable Sequencing/Supervisory Circuits

19-1568; Rev 2; 12/05
6-Pin µP Reset Circuit with
Power-Fail Comparator
General Description
The MAX6342–MAX6345 family of microprocessor (µP)
supervisory circuits monitors power supplies in digital sys-
tems. These devices significantly improve system reliabili-
ty and accuracy compared to separate ICs or discrete
components.
The MAX6342–MAX6345 provide factory-trimmed V_CC
reset threshold voltages from 2.33V to 4.63V and operate
with supply voltages between +1V and +5.5V. A +1.25V
threshold detector allows for a power-fail warning, for
low-battery detection, or for monitoring another power
supply. The MAX6342 contains an MR input and an
active-low push-pull reset. The MAX6343 and MAX6344
are identical to the MAX6342 except they provide an
active-low, open-drain reset and an active-high, push-
pull reset, respectively. The MAX6345 provides a second
reset output in place of the MR input to give it an active-
high push-pull reset and an active-low push-pull reset.
All of the devices are packaged in a miniature 6-pin
SOT23.
Applications
Portable Computers
Telecom Equipment
Networking Equipment
Portable/Battery-Powered Equipment
Multivoltage Systems
Embedded Control Systems
Features
♦ Small 6-Pin SOT23 Package
♦ Precision Factory-Set V_CC Reset Thresholds
Between 2.33V and 4.63V
♦ Guaranteed RESET Valid to V_CC = +1V
♦ 100ms min Reset Pulse Width
♦ Debounced CMOS-Compatible Manual-Reset
Input
♦ Voltage Monitor for Power-Fail or Low-Battery
Warning
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6342_UT-T -40°C to +125°C 6 SOT23-6
MAX6343_UT-T -40°C to +125°C 6 SOT23-6
MAX6344_UT-T -40°C to +125°C 6 SOT23-6
MAX6345_UT-T -40°C to +125°C 6 SOT23-6
Note: The MAX6342–MAX6345 are available with factory-set
reset thresholds from 2.33V to 4.63V (see Selector Guides 1, 2).
Insert the letter corresponding to the desired nominal reset
threshold into the blank following the part number. There is a
2500 piece order increment required for the SOT package. SOT
Top Marks table appears at end of data sheet.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Pin Configurations
Typical Operating Circuit appears at end of data sheet.
Selector Guide 1
SUFFIX
L
M
T
S
R
Z
RESET THRESHOLD (V)
4.63
4.38
3.08
2.93
2.63
2.33
TOP VIEW
V_CC 1
6 RESET (RESET)
GND 2
MAX6342
MAX6343
MAX6344
5 MR
PFI 3
4 PFO
( ) ARE FOR MAX6344 ONLY.
SOT23-6
Pin Configurations continued at end of data sheet.
Selector Guide 2
PART
MAX6342
MAX6343
MAX6344
MAX6345
PUSH-PULL
RESET OUTPUT
✔
—
—
✔
OPEN-DRAIN
RESET OUTPUT
—
✔
—
—
PUSH-PULL RESET
OUTPUT
—
—
✔
✔
MANUAL-RESET
INPUT
✔
✔
✔
—
________________________________________________________________ Maxim Integrated Products 1
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