MXD1810-MXD1818 MAXIM [Maxim Integrated Products], MXD1810-MXD1818 Datasheet

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MXD1810-MXD1818

Manufacturer Part Number
MXD1810-MXD1818
Description
Low-Power UP Reset Circuits in 3-Pin
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
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 V
supply voltage declines below a preset threshold,
keeping reset asserted for at least 100ms after V
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 V
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 V
down to +1V. These ICs provide a reset comparator
designed to ignore fast transients on V
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.
19-2243; Rev 0; 10/01
*Patent pending
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.
Computers and Controllers
Intelligent Instruments
Set-Top Boxes
Printers
Automotive Systems
Critical µP and µC Monitoring
Portable/Battery-Powered Equipment
________________________________________________________________ Maxim Integrated Products
General Description
Low-Power µP Reset Circuits in 3-Pin
Applications
CC
CC
. Reset
. The
CC
CC
CC
o Precision Monitoring of +2.5V, +3V, +3.3V, and
o Available in Four Reset Output Configurations
o Factory-Set Reset Threshold Voltages: 2.18V,
o ±2.5% Reset Threshold Accuracy Over
o Fixed Reset Timeout Period: 100ms (min)
o Guaranteed RESET/RESET Valid to V
o Debounced Manual Reset Detect
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
with factory-set V
(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.
The MXD1810–MXD1813/MXD1815–MXD1818 are available
TOP VIEW
MXD1810UR_ _-T
MXD1810XR_ _-T
(RESET)
+5V Power-Supply Voltages
2.31V, 2.55V, 2.88V, 3.06V, 4.12V, 4.37V, 4.62V
Temperature
(MXD1813/MXD1818)
RESET
V
CC
PART
1
2
MXD181_X
SC70-3
CC
reset thresholds from +2.18V to +3.06V
() ARE FOR THE MXD1812/MXD1817
-40
-40
3
Ordering Information
TEMP. RANGE
o
o
GND
C to +105
C to +105
SC70/SOT23
Pin Configurations
(RESET)
RESET
V
CC
o
o
C
C
1
2
MXD181_U
SOT23-3
3 SOT23-3
3 SC70-3
PIN-PACKAGE
Features
CC
= +1V
3
GND
1

Related parts for MXD1810-MXD1818

MXD1810-MXD1818 Summary of contents

Page 1

... 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 V ...

Page 2

... Low-Power µP Reset Circuits in 3-Pin SC70/SOT23 ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +6.0V CC Push-Pull RESET (MXD1810/MXD1815), RESET (MXD1812/MXD1817) to GND.....-0. Open-Drain RESET (MXD1811/MXD1816) to GND................................................................-0.3V to +6.0V Open-Drain RESET (MXD1813/MXD1818) to GND ....................................................-0. RESET) ................................................20mA Input Current (V CC 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 ...

Page 3

Low-Power µP Reset Circuits in 3-Pin ELECTRICAL CHARACTERISTICS (continued full range -40°C to +105°C, unless otherwise specified. Typical values are PARAMETER SYMBOL Output High Voltage Output Capacitance (Note 2) Internal Pullup Resistor ...

Page 4

... Low-Power µP Reset Circuits in 3-Pin SC70/SOT23 (T = +25°C, unless otherwise noted.) A OUTPUT VOLTAGE vs. OUTPUT SOURCE CURRENT 0.5 0.4 0.3 0.2 0 0.5 1.0 1.5 OUTPUT CURRENT (mA) MXD1810/MXD1815 PIN NAME SC70 SOT23 RESET GND MXD1811/MXD1816 PIN NAME SC70 SOT23 Open-Drain, Active-Low Reset Output. RESET changes from high to low when V ...

Page 5

... GND 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 V falls below the reset threshold, the reset CC output asserts ...

Page 6

... High-impedance CMOS- logic inputs connected to the RESET/RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most µPs and circuitry do not operate at V below +1V. For MXD1810/ CC MXD1815 applications where RESET must be valid down adding a pulldown resistor between ...

Page 7

Low-Power µP Reset Circuits in 3-Pin CC(MIN) RESET t RP RESET Figure 4. Power-Up Reset Timing Diagram V CC (OPEN) (OPEN) EXTERNAL PUSH BUTTON RESET Figure 6. Manual Reset Timing Diagram MXD1817 applications ...

Page 8

... RESET RESET GND Figure 7. Interfacing to Microprocessors with Bidirectional Reset Pins MXD1810 MXD1815 RESET R PULLDOWN GND *MXD1810/MXD1815 ONLY Figure 8. Ensuring Valid RESET Output Down to V (MXD1810/MXD1815 only PULLUP MXD1812 MXD1817 RESET GND *MXD1812/MXD1817 ONLY Figure 9. Ensuring Valid RESET Output Down to V ...

Page 9

... V reset thresholds from +2.18V to +3.06V CC (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 ...

Page 10

Low-Power µP Reset Circuits in 3-Pin SC70/SOT23 10 ______________________________________________________________________________________ Package Information ...

Page 11

Low-Power µP Reset Circuits in 3-Pin Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications ...

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