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Open-drain microprocessor reset circuit. Reset threshold(nom) 2.63V. Reset timeout period(min) 1ms.
________________General DescriptionThe MAX6315 low-power CMOS microprocessor (µP)
supervisory circuit is designed to monitor power sup-
plies in µP and digital systems. It provides excellent cir-
cuit reliability and low cost by eliminating external
components and adjustments. The MAX6315 also pro-
vides a debounced manual reset input.
This device performs a single function: it asserts a reset
signal whenever the VCCsupply voltage falls below a
preset threshold or whenever manual reset is asserted.
Reset remains asserted for an internally programmed
interval (reset timeout period) after VCC has risen above
the reset threshold or manual reset is deasserted. The
MAX6315’s open-drain RESEToutput can be pulled up
to a voltage higher than VCC.
The MAX6315 comes with factory-trimmed reset thresh-
old voltages in 100mV increments from 2.5V to 5V.
Preset timeout periods of 1ms, 20ms, 140ms, and
1120ms (minimum) are also available. The device
comes in a SOT143 package.
For microcontrollers (µCs) and µPs with bidirectional
reset pins, see the MAX6314 data sheet.
________________________ApplicationsComputers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
____________________________FeaturesSmall SOT143 PackageOpen-Drain RESETOutput Can Exceed VCCPrecision, Factory-Set VCCReset Thresholds:
100mV Increments from 2.5V to 5V±1.8% Reset Threshold Accuracy at TA= +25°C±2.5% Reset Threshold Accuracy Over Temp.Four Reset Timeout Periods Available:
1ms, 20ms, 140ms, or 1120ms (minimum) Immune to Short VCCTransients5µA Supply CurrentPin-Compatible with MAX811
MAX6315
Open-Drain SOT µP Reset Circuit
__________________Pin Configuration
__________Typical Operating Circuit19-2000; Rev 1; 1/99
MAX6315
Open-Drain SOT µP Reset Circuit
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +2.5V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1:The MAX6315 monitors VCCthrough an internal factory-trimmed voltage divider that programs the nominal reset threshold.
Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see Ordering and Marking
Information).
VCC........................................................................-0.3V to +6.0V
RESET....................................................................-0.3V to +6.0V
All Other Pins..............................................-0.3V to (VCC+ 0.3V)
Input Current (VCC).............................................................20mA
Output Current (RESET)......................................................20mA
Rate of Rise (VCC)...........................................................100V/µs
Continuous Power Dissipation (TA= +70°C)
SOT143 (derate 4mW/°C above +70°C)........................320mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Open-Drain SOT µP Reset Circuit
__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
______________________________________________________________Pin Description
_______________Detailed Description
Reset OutputA 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. RESETis guaranteed to be a
logic low for VCC> 1V (see Electrical Characteristics).
Once VCCexceeds the reset threshold, the internal
timer keeps reset asserted for the reset timeout period
(tRP); after this interval RESETgoes high. If a brownout
condition occurs (monitored voltage dips below its pro-
grammed reset threshold), RESETgoes low. Any time
VCCdips below the reset threshold, the internal timer
resets to zero and RESETgoes low. The internal timer
starts when VCCreturns above the reset threshold, andRESETremains low for the reset timeout period.
The MAX6315’s RESEToutput 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 RESETis asserted (see Electrical Characteristics),
and small enough to register a logic high while supply-
ing all input current and leakage paths connected to the
RESETline. A 10kΩpull-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 VCCpin. 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, RESETwill
be pulled high as VCCdecays 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 InputMany 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 MRis low,
and for the reset active timeout period after MR returns
high. has an internal 63kΩpull-up resistor, so it can be
left open if not used. Connect a normally open momen-
tary switch from MRto GND to create a manual reset
function; external debounce circuitry is not required.
If MRis driven from long cables or if the device is used
in a noisy environment, connecting a 0.1µF capacitor
from MRto ground provides additional noise immunity.
__________Applications Information
Negative-Going VCCTransientsIn 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-
isticsshow 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 VRSTmax 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 VCCtran-
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 VCCprovides additional
transient immunity.
MAX6315
Open-Drain SOT µP Reset Circuit
MAX6315
Open-Drain SOT µP Reset Circuit
________________________________________________________Ordering Information†The MAX6315 is available in a SOT143 package, -40°C to +85°C temperature range.
††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.
†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.
Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.
Note:All devices available in tape-and-reel only. Contact factory for availability.
MAX6315
Open-Drain SOT µP Reset Circuit
___________________________________________Ordering Information (continued)†The MAX6315 is available in a SOT143 package, -40°C to +85°C temperature range.
††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.
†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.
Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.
Note:All devices available in tape-and-reel only. Contact factory for availability.
