MAX6711TEXS-T10 Maxim Integrated, MAX6711TEXS-T10 Datasheet - Page 6
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MAX6711TEXS-T10
Manufacturer Part Number
MAX6711TEXS-T10
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6711, MAX6711L, MAX6711M, MAX6711R, MAX6711S, MAX6711T, MAX6711Z, MAX6712, MAX6712L, MAX6712M, MAX6712R, MAX6712S, MAX6712T, MAX6712Z, MAX6713, MAX6713L, MAX6713M, MAX6713R, MAX6713S, MAX6713T, MAX6713Zr
Datasheet
1.MAX6712TEXS-T.pdf
(8 pages)
Specifications of MAX6711TEXS-T10
Number Of Voltages Monitored
1
Monitored Voltage
2.5 V, 3 V, 3.3 V, 5 V
Undervoltage Threshold
3.04 V
Overvoltage Threshold
3.11 V
Output Type
Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
640 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
SC-70
Chip Enable Signals
No
Maximum Power Dissipation
245 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
12 uA
Supply Voltage - Min
1.2 V
maximum allowable pulse width decreases. Typically, for
the MAX671_L and MAX671_M, a V
goes 100mV below the reset threshold and lasts 20µs or
less will not cause a reset pulse. A 0.1µF bypass capaci-
tor mounted as close as possible to the V
additional transient immunity.
When V
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS-logic inputs con-
nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most µP and other circuitry is inoperative with V
below 1V. However, in applications where RESET must
be valid down to 0, adding a pull-down resistor to
RESET causes any stray leakage currents to flow to
ground, holding RESET low (Figure 2). R1’s value is not
critical; 100kΩ is large enough not to load RESET and
small enough to pull RESET to ground.
A 100kΩ pull-up resistor to V
for the MAX6712 if RESET is required to remain valid for
V
Since the RESET output on the MAX6713 is open-drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESET output directly
to the µP’s RESET pin with a single pull-up resistor
allows either device to assert reset (Figure 3).
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
Figure 3. Interfacing to µPs with Bidirectional Reset I/O
6
CC
V
_______________________________________________________________________________________
CC
< 1V.
MR
CC
MAX6713
falls below 1V, the MAX6711 RESET output
GND
V
CC
Ensuring a Valid Reset Output
RESET
Bidirectional Reset Pins
Interfacing to µPs with
CC
is also recommended
Down to V
RESET
INPUT
CC
CC
MOTOROLA
68HCXX
transient that
GND
V
µP
pin provides
CC
CC
= 0
CC
Generally, the pull-up connected to the MAX6713 will
connect to the supply voltage that is being monitored at
the IC’s V
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 4). Note that as the MAX6713’s V
below 1V, so does the IC’s ability to sink current at
RESET. Also, with any pullup, RESET will be pulled high
as V
depends on the pull-up resistor value and the voltage
to which it is connected.
Most µP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal sup-
ply voltages. This ensures a reset will not occur within
5% of the nominal supply, but will occur when the sup-
ply is 10% below nominal.
When using ICs rated at only the nominal supply ±5%,
a zone of uncertainty where the supply is between 5%
and 10% low, and where the reset may or may not be
asserted is left.
The MAX671_L/T/Z use highly accurate circuitry to
ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below
nominal.
Figure 4. MAX6713 Open-Drain RESET Output Allows Use with
Multiple Supplies
TRANSISTOR COUNT: 380
___________________Chip Information
CC
decays toward 0. The voltage where this occurs
MAX6713 Open-Drain
CC
MAX6713
Allows Use with Multiple Supplies
+3.3V
GND
V
pin. However, some systems may use the
CC
RESET
Benefits of Highly Accurate
R
PULLUP
Reset Threshold
RESET
INPUT
RESET Output
5V SYSTEM
+5.0V
CC
GND
V
CC
decreases