MAX6711TEXS+T Maxim Integrated Products, MAX6711TEXS+T Datasheet - Page 5

• Manufacturer Part Number: MAX6711TEXS+T
• Description: IC MPU/RESET CIRC SC70-4
• Manufacturer: Maxim Integrated Products
• Type: Simple Reset/Power-On Resetr

Specifications of MAX6711TEXS+T

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 3.08V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SC-70-4, SC-82-4, SOT-323-4, SOT-343
• Monitored Voltage: 2.5 V or 3 V or 3.3 V or 5 V
• Undervoltage Threshold: 3.04 V
• Overvoltage Threshold: 3.11 V
• Manual Reset: Resettable
• Watchdog: No
• Battery Backup Switching: No
• Power-up Reset Delay (typ): 640 ms
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.2 V
• Supply Current (typ): 12 uA (Typ)
• Maximum Power Dissipation: 245 mW
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Chip Enable Signals: No
• Minimum Operating Temperature: - 40 C
• Output Type: Active Low or Push-Pull
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX6711TEXS+TTR

_____________________Pin Description
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6711/MAX6712/MAX6713 assert
reset to prevent code-execution errors during power-
up, power-down, or brownout conditions. They assert a
reset signal whenever the V
below a preset threshold, keeping it asserted for at
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
PIN
1
2
3
4
(MAX6711/
(MAX6712)
MAX6713)
RESET
RESET
NAME
320
240
160
400
GND
V
80
MR
0
CC
RESET COMPARATOR OVERDRIVE, V
1
MAX671_R/S/T/Z
4-Pin SC70 Microprocessor Reset Circuits
T
A
= +25°C
_______________________________________________________________________________________
Ground
RESET output remains low while V
is below the reset threshold, and for at
least 140ms after V
reset threshold.
RESET output remains high while V
is below the reset threshold, and for at
least 140ms after V
reset threshold.
Manual Reset Input. RESET (RESET)
remains asserted as long as MR is low,
and for at least 140ms after MR is
deasserted. This active-low input has
an internal 20kΩ (typ) pull-up resistor.
It can be driven from a TTL- or CMOS-
logic line, or shorted to ground with a
switch. Leave open or connect to V
if unused.
Supply Voltage (+5.0V, +3.3V, +3.0V,
or +2.5V)
Detailed Description
10
MAX671_L/M
CC
FUNCTION
supply voltage declines
100
TH
CC
CC
- V
Reset Output
CC
rises above the
rises above the
(mV)
1000
CC
CC
CC
with Manual Reset Input
least 140ms after V
old. The MAX6713 uses an open-drain output, and the
MAX6711/MAX6712 have a push-pull output stage.
Connect a pull-up resistor on the MAX6713’s RESET
output to any supply between 0 and 6V.
Many µP-based systems require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. Reset remains asserted
while MR is low, and for at least 140ms after MR returns
high. This input has an internal 20kΩ pullup resistor, so
it can be left open if it is not used. MR can be driven
with TTL- or CMOS-logic levels, or with open-drain/col-
lector outputs. To create a manual reset function, con-
nect a normally open momentary switch from MR to
ground; external debounce circuitry is not required. If
MR is driven from long cables or if the device is used in
a noisy environment, connecting a 0.1µF capacitor from
MR to ground provides additional noise immunity.
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX6711/
MAX6712/MAX6713 are relatively immune to short-dura-
tion negative-going V
Figure 1 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX6711/MAX6712/
MAX6713 do not generate a reset pulse. The graph was
generated using a negative-going pulse applied to V
starting 0.5V above the actual reset threshold and end-
ing below it by the magnitude indicated (reset compara-
tor overdrive). The graph indicates the maximum pulse
width a negative-going V
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
Figure 2. RESET Valid to V
Negative-Going V
Applications Information
MR
CC
CC
MAX6711
has risen above the reset thresh-
CC
GND
V
transients (glitches).
CC
CC
RESET
= Ground Circuit
transient can have without
Manual Reset Input
CC
R1
100k
Transients
CC
5
,