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MAX6315US49D1-T Datasheet(PDF) 4 Page - Maxim Integrated Products

Part # MAX6315US49D1-T
Description  Open-Drain SOT 關P Reset Circuit
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6315US49D1-T Datasheet(HTML) 4 Page - Maxim Integrated Products

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_______________Detailed Description
Reset Output
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6315 asserts reset to prevent
code-execution errors during power-up, power-down,
or brownout conditions. RESET is guaranteed to be a
logic low for VCC > 1V (see Electrical Characteristics).
Once VCC exceeds the reset threshold, the internal
timer keeps reset asserted for the reset timeout period
(tRP); after this interval RESET goes high. If a brownout
condition occurs (monitored voltage dips below its pro-
grammed reset threshold), RESET goes low. Any time
VCC dips below the reset threshold, the internal timer
resets to zero and RESET goes low. The internal timer
starts when VCC returns above the reset threshold, and
RESET remains low for the reset timeout period.
The MAX6315’s RESET output structure is a simple
open-drain N-channel MOSFET switch. Connect a pull-
up resistor to any supply in the 0V to +6V range. Select
a resistor value large enough to register a logic low
when RESET is asserted (see
Electrical Characteristics),
and small enough to register a logic high while supply-
ing all input current and leakage paths connected to the
RESET line. A 10k
Ω pull-up is sufficient in most applica-
tions.
Often, the pull-up connected to the MAX6315’s RESET
output will connect to the supply voltage monitored at
the IC’s VCC pin. However, some systems may use the
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 1). This is one useful feature of an open-drain
output. Keep in mind that as the MAX6315’s VCC
decreases below 1V, so does the IC’s ability to sink
current at RESET. Finally, with any pull-up, RESET will
be pulled high as VCC decays toward 0V. The voltage
where this occurs depends on the pull-up resistor value
and the voltage to which it connects (see
Electrical
Characteristics).
Manual-Reset Input
Many µP-based products require manual-reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MR is low,
and for the reset active timeout period after MR returns
high.
MR has an internal 63k
Ω pull-up resistor, so it can be
left open if not used. Connect a normally open momen-
tary switch from MR to GND to create a manual reset
function; 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, these devices
are relatively immune to short-duration negative-going
transients (glitches). The
Typical Operating Character-
istics show the Maximum Transient Duration vs. Reset
Threshold Overdrive, for which reset pulses are not
generated. The graph was produced using negative-
going pulses, starting at VRST max and ending below
the programmed reset threshold by the magnitude indi-
cated (reset threshold overdrive). The graph shows the
maximum pulse width that a negative-going VCC tran-
sient may typically have without causing a reset pulse
to be issued. As the transient amplitude increases (i.e.,
goes farther below the reset threshold), the maximum
allowable pulse width decreases. A 0.1µF bypass
capacitor mounted close to VCC provides additional
transient immunity.
Open-Drain SOT µP Reset Circuit
4
_______________________________________________________________________________________
Figure 1. MAX6315 Open-Drain RESET Output Allows Use
with Multiple Supplies
MAX6315
VCC
GND
RESET
MR
5V SYSTEM
+5.0V
+3.3V
10k


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