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MAX6711L Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX6711L
Description  4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX6711L Datasheet(HTML) 5 Page - Maxim Integrated Products

   
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_______________________________________________________________________________________
5
Detailed Description
Reset Output
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 VCC supply voltage declines
below a preset threshold, keeping it asserted for at
least 140ms after VCC has risen above the reset thresh-
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.
Manual Reset Input
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 20k
Ω 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.
Applications Information
Negative-Going VCC Transients
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 VCC transients (glitches).
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 VCC,
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 VCC transient can have without
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
R1
100k
VCC
GND
MR
MAX6711
RESET
Figure 2. RESET Valid to VCC = Ground Circuit
2
RESET
(MAX6711/
MAX6713)
RESET output remains low while VCC
is below the reset threshold, and for at
least 140ms after VCC rises above the
reset threshold.
1
GND
Ground
PIN
NAME
FUNCTION
RESET
(MAX6712)
RESET output remains high while VCC
is below the reset threshold, and for at
least 140ms after VCC rises above the
reset threshold.
_____________________Pin Description
400
320
0
1
100
1000
160
80
240
RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
10
TA = +25
°C
MAX671_L/M
MAX671_R/S/T/Z
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
3
MR
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 20k
Ω (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 VCC
if unused.
4
VCC
Supply Voltage (+5.0V, +3.3V, +3.0V,
or +2.5V)


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