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PDF MAX6344 Data sheet ( Hoja de datos )
| Número de pieza | MAX6344 | |
| Descripción | 6-Pin uP Reset Circuit | |
| Fabricantes | Maxim Integrated Products | |
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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
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
Features
♦ Small 6-Pin SOT23 Package
♦ Precision Factory-Set VCC Reset Thresholds
Between 2.33V and 4.63V
♦ Guaranteed RESET Valid to VCC = +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
TOP VIEW
VCC 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
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.
http://www.Datasheet4U.com
1 page  
6-Pin µP Reset Circuit with
Power-Fail Comparator
MAX6342
PIN
MAX6343 MAX6344
MAX6345
5 5 5—
6 6—
——
6
5
6
NAME
MR
RESET
RESET
Pin Description (continued)
FUNCTION
Manual-Reset Input. Pull low to force a reset. RESET or 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.
Active-Low Reset Output. Push-pull for MAX6342/MAX6345.
Open-drain for MAX6343. It remains low for 180ms after VCC
rises above the reset threshold or MR goes from low to high.
Active-High Push-Pull Reset Output. It remains high for 180ms
after VCC rises above the reset threshold or MR goes from low
to high.
1 VCC
VTH
2
GND
3
PFI
1.25V
RESET
GENERATOR
6
RESET
VCC (RESET)
MAX6342
MAX6343
MAX6344
100kΩ
5
MR
4
PFO
( ) ARE FOR MAX6344 ONLY.
Figure 1. MAX6342/MAX6343/MAX6344 Functional Diagram
1 VCC
VTH
2
GND
3
PFI
1.25V
RESET
GENERATOR
RESET 6
MAX6345
RESET 5
PFO 4
Figure 2. MAX6345 Functional Diagram
_______________Detailed Description
Reset Output
A µP’s reset input starts the µP in a known state. These
µP supervisory circuits assert reset to prevent code-
execution errors during power-up, power-down, or
brownout conditions.
RESET and RESET are guaranteed to be asserted at a
valid logic level for V CC > +1V (see the Electrical Char-
acteristics table). Once RESET asserts, it remains
asserted for at least 100ms (t RP) after V CC rises above
its threshold value or after MR returns high (Figures 1
and 2).
Open-Drain RESET Output
The MAX6343 has an active-low, open-drain reset out-
put. This output sinks current when RESET is asserted.
Connect a pull-up resistor from RESET to any positive
supply voltage up to +5.5V (Figure 3). Select a resistor
value large enough to register a logic low (see the Elec-
trical Characteristics table), and small enough to regis-
ter a logic high while supplying all input current and
leakage paths connected to the RESET line. A 10k Ω
pull-up is sufficient in most applications.
Manual Reset
The MAX6342/MAX6343/MAX6344s’ manual-reset input
(MR) allows reset to be triggered by a pushbutton
switch. The switch is effectively debounced by the 1µs
min reset pulse width. MR is CMOS-logic compatible.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX6344.PDF ] | |
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