MXD1813UR Datasheet PDF - Maxim Integrated
| Part Number | MXD1813UR | |
| Description | Low-Power UP Reset Circuits in 3-Pin | |
| Manufacturers | Maxim Integrated | |
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19-2243; Rev 0; 10/01
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
General Description
The MXD1810–MXD1813/MXD1815–MXD1818 family of
microprocessor (µP) reset circuits monitor power sup-
plies in µP and digital systems. These devices provide
excellent circuit reliability and low cost by eliminating
external components and adjustments when used with
+2.5V/+3.0V/+3.3V (MXD1815–MXD1818), and +5V
(MXD1810–MXD1813) systems.
These circuits assert a reset signal whenever the VCC
supply voltage declines below a preset threshold,
keeping reset asserted for at least 100ms after VCC
rises above the reset threshold. The MXD1813/
MXD1818 also keep reset asserted for at least 100ms
after the output is momentarily pulled to GND by an
external push-button switch.
The MXD1812/MXD1817 have an active-high push-pull
RESET output. The MXD1810/MXD1815 (push-pull) and
MXD1811/MXD1813/MXD1816/MD1818 (open-drain)
have an active-low RESET output. The open-drain
devices (MXD1811/MXD1813/MXD1816/MXD1818)
have an internal pullup resistor to VCC. The
MXD1813/MXD1818 feature a debounced manual reset
feature that asserts a reset if the RESET pin is pulled
low for more than 1.5µs. When used to initiate manual
reset, RESET debounces signals from devices such as
mechanical switches. For devices with this feature, the
release of the external switch triggers the reset period.
The MXD1810–MXD1813/MXD1815–MXD1818 are
guaranteed to output the correct logic state for VCC
down to +1V. These ICs provide a reset comparator
designed to ignore fast transients on VCC. Reset
thresholds are available between +2.18V and +4.62V.
These small, low-power (4µA) devices are ideal for use
in portable equipment. All are available in space-saving
3-pin SC70 and SOT23 packages, and are specified
from -40°C to +105°C.
Applications
Computers and Controllers
Intelligent Instruments
Set-Top Boxes
Printers
Automotive Systems
Critical µP and µC Monitoring
Portable/Battery-Powered Equipment
*Patent pending
Features
o Precision Monitoring of +2.5V, +3V, +3.3V, and
+5V Power-Supply Voltages
o Available in Four Reset Output Configurations
o Factory-Set Reset Threshold Voltages: 2.18V,
2.31V, 2.55V, 2.88V, 3.06V, 4.12V, 4.37V, 4.62V
o ±2.5% Reset Threshold Accuracy Over
Temperature
o Fixed Reset Timeout Period: 100ms (min)
o Guaranteed RESET/RESET Valid to VCC = +1V
o Debounced Manual Reset Detect
(MXD1813/MXD1818)
o Power-Supply Transient Immunity
o No External Components
o Low Power Consumption (4µA)
o Pin Compatible with DS181_ Products (SOT23)
o 3-Pin SC70 and SOT23 Packages
Ordering Information
PART†
TEMP. RANGE PIN-PACKAGE
MXD1810UR_ _-T -40oC to +105oC
3 SOT23-3
MXD1810XR_ _-T
-40oC to +105oC
3 SC70-3
†The MXD1810–MXD1813/MXD1815–MXD1818 are available
with factory-set VCC reset thresholds from +2.18V to +3.06V
(MXD1815–MXD1818) and +4.12V to +4.62V (MXD1810–
MXD1813). Choose the desired reset-threshold suffix from the
Reset Threshold Table and insert it in place of the “_ _” follow-
ing “R” in the part number. All devices are available in tape-
and-reel only in 2500 unit increments. Other threshold voltages
may be available. Contact factory for availability.
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
VCC 1
RESET
(RESET)
2
MXD181_X
3 GND
RESET
(RESET)
1
VCC 2
MXD181_U
3 GND
SC70-3
SOT23-3
() ARE FOR THE MXD1812/MXD1817
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
MXD1812/MXD1817
PIN
SC70
SOT23
NAME
2 1 RESET
1 2 VCC
3 3 GND
Pin Descriptions (continued)
FUNCTION
Push-Pull, Active-High Reset Output. RESET changes from low to high when VCC drops
below the selected reset threshold. RESET remains high for the reset timeout period after
VCC exceeds the device reset threshold.
Supply Voltage and Input for Reset Threshold Monitor
Ground
MXD1813/MXD1818
PIN
SC70
SOT23
NAME
2 1 RESET
1 2 VCC
3 3 GND
FUNCTION
Open-Drain, Active-Low Reset Output with Manual Reset Detect. RESET changes from
high to low when VCC drops below the selected reset threshold, or RESET is externally
pulled low for at least 1.5µs. RESET remains low for the reset timeout period after VCC
exceeds the device reset threshold or after the external manual reset is released. RESET
has an internal 5.5kΩ pullup resistor.
Supply Voltage and Input for Reset Threshold Monitor
Ground
Detailed Description
RESET/RESET Output
A microprocessor’s (µP’s) reset input starts the micro-
processor in a known state. The MXD1810–MXD1813/
MXD1815–MXD1818 µP supervisory circuits assert
reset to prevent code-execution errors during power-
up, power-down, and brownout conditions (Figure 4).
Whenever VCC falls below the reset threshold, the reset
output asserts. Once VCC exceeds the reset threshold,
an internal timer keeps the reset output asserted for the
specified reset timeout period (tRP). Reset is also trig-
gered by an externally initiated rising edge on the
RESET pin (MXD1813/MXD1818), following a low signal
of 1.5µs minimum duration.
Push-Button Reset (MXD1813/MXD1818)
Many µP-based products require push-button reset
capability (Figure 5), allowing the operator, a test tech-
nician, or external logic circuitry to initiate reset. On the
MXD1813/MXD1818, a logic-low on RESET held for
greater than 1.5µs asserts a reset. RESET deasserts
following a 100ms minimum reset timeout delay
(tPBRST). A manual reset input shorter than 1.5µs may
release RESET without the 100ms minimum reset time-
out delay. To facilitate use with mechanical switches,
the MXD1813/MXD1818 contain internal debouncing
circuitry. A debounced waveform is shown in Figure 6.
Applications Information
Interfacing to µPs with Bidirectional
Reset Pins
Since the RESET output on the MXD1811/MXD1816 is
open drain, these devices interface easily with µPs that
have bidirectional reset pins, such as the Motorola
68HC11. Connecting the µP supervisor’s RESET output
directly to the microcontroller’s (µC’s) RESET pin allows
either device to assert reset (Figure 7). No external
pullup resistor is required, as it is contained within the
MXD1811/MXD1816.
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
VCC transients (glitches).
_______________________________________________________________________________________ 5
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