19-1568; Rev 1; 3/00
6-Pin 碌P Reset Circuit with
Power-Fail Comparator
General Description
The MAX6342鈥揗AX6345 family of microprocessor (碌P)
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鈥揗AX6345 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.
o
Small 6-Pin SOT23 Package
o
Precision Factory-Set V
CC
Reset Thresholds
Between 2.33V and 4.63V
o
Guaranteed
RESET
Valid to V
CC
= +1V
o
100ms min Reset Pulse Width
o
Debounced CMOS-Compatible Manual-Reset
Input
o
Voltage Monitor for Power-Fail or Low-Battery
Warning
Features
MAX6342鈥揗AX6345
Ordering Information
PART
MAX6342_UT-T
MAX6343_UT-T
MAX6344_UT-T
MAX6345_UT-T
TEMP. RANGE
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
Applications
Portable Computers
Telecom Equipment
Networking Equipment
Portable/Battery-Powered Equipment
Multivoltage Systems
Embedded Control Systems
Note:
The MAX6342鈥揗AX6345 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.
Pin Configurations
TOP VIEW
Typical Operating Circuit appears at end of data sheet.
Selector Guide 1
SUFFIX
RESET THRESHOLD (V)
4.63
4.38
3.08
2.93
2.63
2.33
V
CC
1
6
RESET (RESET)
L
M
T
S
R
Z
GND
2
MAX6342
MAX6343
MAX6344
5
MR
PFI
3
( ) ARE FOR MAX6344 ONLY.
4
PFO
SOT23-6
Pin Configurations continued at end of data sheet.
Selector Guide 2
PART
MAX6342
MAX6343
MAX6344
MAX6345
PUSH-PULL
RESET
OUTPUT
鉁?/div>
鈥?/div>
鈥?/div>
鉁?/div>
OPEN-DRAIN
RESET
OUTPUT
鈥?/div>
鉁?/div>
鈥?/div>
鈥?/div>
PUSH-PULL RESET
OUTPUT
鈥?/div>
鈥?/div>
鉁?/div>
鉁?/div>
MANUAL-RESET
INPUT
鉁?/div>
鉁?/div>
鉁?/div>
鈥?/div>
1
________________________________________________________________
Maxim Integrated Products
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX6343 PDF文件相關(guān)型號(hào)
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