MXD1812UR [MAXIM]
Low-Power UP Reset Circuits in 3-Pin; 低功耗复位电路在3引脚
| 型号： | MXD1812UR |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Power UP Reset Circuits in 3-Pin |
| 文件： | 总11页 (文件大小：198K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2243; Rev 0; 10/01
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
General Description
Features
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.
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
2.5ꢀ Reset Threshold Accuracy Over
Temperature
These circuits assert a reset signal whenever the V
CC
supply voltage declines below a preset threshold,
o Fixed Reset Timeout Period: 100ms (min)
keeping reset asserted for at least 100ms after V
CC
o Guaranteed RESET/RESET Valid to V
= +1V
CC
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.
o Debounced Manual Reset Detect
(MXD1813/MXD1818)
o Power-Supply Transient Immunity
o No External Components
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)
o Low Power Consumption (4µA)
o Pin Compatible with DS181_ Products (SOT23)
o 3-Pin SC70 and SOT23 Packages
have an internal pullup resistor to V . The
CC
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.
Ordering Information
PART†
TEMP. RANGE
-40oC to +105oC
-40oC to +105oC
PIN-PACKAGE
3 SOT23-3
MXD1810UR_ _-T
MXD1810XR_ _-T
3 SC70-3
†The MXD1810–MXD1813/MXD1815–MXD1818 are available
with factory-set V reset thresholds from +2.18V to +3.06V
The MXD1810–MXD1813/MXD1815–MXD1818 are
CC
guaranteed to output the correct logic state for V
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. Other threshold voltages
may be available. Contact factory for availability.
down to +1V. These ICs provide a reset comparator
designed to ignore fast transients on V . Reset
CC
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.
Ordering Information continued at end of data sheet.
Applications
Pin Configurations
Computers and Controllers
Intelligent Instruments
Set-Top Boxes
TOP VIEW
RESET
(RESET)
V
1
2
1
2
CC
Printers
GND
3
GND
3
MXD181_X
MXD181_U
Automotive Systems
Critical µP and µC Monitoring
RESET
V
CC
(RESET)
Portable/Battery-Powered Equipment
SC70-3
SOT23-3
*Patent pending
() 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.
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
ABSOLUTE MAXIMUM RATINGS
CC
V
to GND...........................................................-0.3V to +6.0V
Output Current (RESET, RESET).........................................20mA
Push-Pull RESET (MXD1810/MXD1815),
Continuous Power Dissipation (T = +70°C)
A
RESET (MXD1812/MXD1817) to GND.....-0.3V to (V
Open-Drain RESET (MXD1811/MXD1816)
to GND................................................................-0.3V to +6.0V
Open-Drain RESET (MXD1813/MXD1818)
+ 0.3V)
3-Pin SC70 (derate 2.17mW above +70°C)..................174mW
3-Pin SOT23 (derate 4mW/°C above +70°C) ...............320mW
Operating Temperature Range .........................-40°C to +105°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
to GND ....................................................-0.3V to (V
+ 0.3V)
CC
Input Current (V , RESET)................................................20mA
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. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= full range, T = -40°C to +105°C, unless otherwise specified. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
T = 0°C to +105°C
MIN
1.0
TYP
MAX
5.5
UNITS
A
Supply Voltage Range
Supply Current
V
V
CC
T = -40°C to +105°C
A
1.2
5.5
V
V
= +5.5V, V
= +3.6V, V
> V , no load
9
16
CC
CC
CC
CC
TH
I
µA
CC
> V , no load
4
10
TH
MXD181_ _ R46
MXD181_ _ R44
MXD181_ _ R41
MXD181_ _ R31
MXD181_ _ R29
MXD181_ _ R26
MXD181_ _ R23
MXD181_ _ R22
4.50
4.25
4.00
2.98
2.80
2.47
2.25
2.12
100
4.62
4.37
4.12
3.06
2.88
2.55
2.31
2.18
150
2
4.75
4.49
4.24
3.15
2.97
2.64
2.37
2.25
250
5
Reset Threshold
V
V
TH
Active Reset Timeout Period
t
V
V
V
rising
ms
µs
RP
CC
CC
CC
= (V + 100mV) falling to (V - 200mV)
TH
TH
V
to Reset Delay
t
CC
RD
rising, t = 5µs
100
1.5
150
250
ms
µs
R
Push-Button Detect to Reset
t
MXD1813/MXD1818 only
MXD1813/MXD1818 only
PB
Push-Button Reset Timeout Period
t
100
150
250
0.34
0.15
ms
PBRST
T = +25°C to +105°C
A
MXD1813/MXD1818
only
Input Low Voltage
V
V
V
IL
IH
T = -40°C to +25°C
A
Input High Voltage
V
MXD1813/MXD1818 only
0.7 × V
CC
V
≥ V , reset not asserted,
CC
TH(MAX)
RESET Output Source Current
I
350
350
µA
OH
MXD1810/MXD1815
V
≤ V , reset asserted,
CC
TH(MIN)
RESET Output Source Current
RESET Output Sink Current
RESET Output Sink Current
I
µA
mA
mA
OH
MXD1812/MXD1817
V
≥ 2.7V, reset asserted, V = 0.4V
OUT
CC
MXD1810/MXD1811/MXD1813/MXD1815/
MXD1816/MXD1818
(Note 2)
I
10
10
OL
OL
V
≥ 2.7V, reset not asserted, , V
= 0.4V
CC
OUT
I
MXD1812/MXD1817
2
_______________________________________________________________________________________
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
ELECTRICAL CHARACTERISTICS (continued)
(V
= full range, T = -40°C to +105°C, unless otherwise specified. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
-
V
-
CC
CC
Output High Voltage
V
0 < I
OH
< 500µA
OH
0.5
0.1
Output Capacitance (Note 2)
C
10
7.5
7.5
pF
OUT
MXD1811/MXD1816
MXD1813/MXD1818
3.5
3.1
5.5
5.5
Internal Pullup Resistor
Open-Drain
R
kΩ
P
Note 1: Production testing done at T = +25°C; limits over temperature guaranteed by design.
A
Note 2: The MXD1811/MXD1813/MXD1816/MXD1818 have an internal pullup resistor which may deliver 1mA of sink current.
Note 3: Guaranteed by design.
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
RESET TIMEOUT PERIOD
vs. TEMPERATURE (V RISING)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE (V FALLING)
SUPPLY CURRENT vs. TEMPERATURE
CC
CC
10
1.010
1.005
1.000
0.995
0.990
RESET/RESET NOT ASSERTED
160
156
152
148
144
140
V
= +5V
CC
8
6
4
2
0
V
= +5V
CC
V
= +4.62V
TH
V
= +2.5V
CC
V
= +2.18V
TH
V
= +3.3V
CC
V
= +2.5V
CC
-40
-10
20
50
80
110
-40
-10
20
50
80
110
-40
-10
20
50
80
110
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
POWER-DOWN RESET DELAY
vs. TEMPERATURE
100
200
160
120
80
3.0
90
80
70
60
50
40
30
20
10
0
2.5
2.0
1.5
1.0
0.5
0
V
= +4.62V
TH
RESET OCCURS
ABOVE THIS LINE
V
= +2.18V
TH
40
0
10
100
1000
0
3
6
9
12
15
110
-40
-10
20
50
80
RESET THRESHOLD OVERDRIVE, V - V (mV)
TH
CC
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
OUTPUT VOLTAGE
vs. OUTPUT SOURCE CURRENT
INPUT LOW VOLTAGE
vs. V AND TEMPERATURE
CC
0.5
0.4
0.3
0.2
0.1
0
0.8
0.6
0.4
0.2
V
= +5.5V
CC
V
= +2.2V
50
CC
3.0
-40
20
110
0
0.5
1.0
1.5
2.0
2.5
-10
80
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Pin Descriptions
MXD1810/MXD1815
PIN
NAME
FUNCTION
Push-Pull, Active-Low Reset Output. RESET changes from high to low when V
SC70
SOT23
drops
CC
2
1
RESET
below the selected reset threshold. RESET remains low for the reset timeout period after
exceeds the device reset threshold.
V
CC
1
3
2
3
V
Supply Voltage and Input for Reset Threshold Monitor
Ground
CC
GND
MXD1811/MXD1816
PIN
NAME
FUNCTION
SC70
SOT23
Open-Drain, Active-Low Reset Output. RESET changes from high to low when V
drops
CC
2
1
RESET
below the selected reset threshold. RESET remains low for the reset timeout period after
exceeds the device reset threshold. RESET has an internal 5.5kΩ pullup resistor.
V
CC
1
3
2
3
V
CC
Supply Voltage and Input for Reset Threshold Monitor
Ground
GND
4
_______________________________________________________________________________________
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
Pin Descriptions (continued)
MXD1812/MXD1817
PIN
NAME
FUNCTION
SC70
SOT23
Push-Pull, Active-High Reset Output. RESET changes from low to high when V
drops
CC
2
1
RESET
below the selected reset threshold. RESET remains high for the reset timeout period after
exceeds the device reset threshold.
V
CC
1
3
2
3
V
Supply Voltage and Input for Reset Threshold Monitor
Ground
CC
GND
MXD1813/MXD1818
PIN
NAME
FUNCTION
SC70
SOT23
Open-Drain, Active-Low Reset Output with Manual Reset Detect. RESET changes from
high to low when V
drops below the selected reset threshold, or RESET is externally
CC
2
1
RESET
pulled low for at least 1.5µs. RESET remains low for the reset timeout period after V
CC
exceeds the device reset threshold or after the external manual reset is released. RESET
has an internal 5.5kΩ pullup resistor.
1
3
2
3
V
Supply Voltage and Input for Reset Threshold Monitor
Ground
CC
GND
(t
). A manual reset input shorter than 1.5µs may
PBRST
Detailed Description
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.
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).
Applications Information
Interfacing to µPs with Bidirectional
Reset Pins
Whenever V
falls below the reset threshold, the reset
CC
output asserts. Once V
exceeds the reset threshold,
CC
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.
an internal timer keeps the reset output asserted for the
specified reset timeout period (t ). Reset is also trig-
RP
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
Negative-Going V
CC
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
V
transients (glitches).
CC
_______________________________________________________________________________________
5
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
Functional Diagram
MXD1810
MXD1812
MXD1815
MXD1817
MXD1811
MXD1816
V
CC
V
CC
RESET
RESET
GENERATOR
RESET
OR
RESET
RESET
GENERATOR
V
REF
V
REF
Figure 1. Functional Diagram, Push-Pull Output
Figure 2. Functional Diagram, Open-Drain Active-Low Output
The Typical Operating Characteristics show the
Maximum Transient Duration vs. Reset Threshold
Overdrive for which reset pulses are not generated. The
graph shows the maximum pulse width that a negative-
MXD1813
MXD1818
going V
transient may typically have without issuing a
CC
V
CC
reset signal. As the amplitude of the transient increases,
the maximum allowable pulse width decreases.
Ensuring a Valid Reset Output Down to
MR
MONITOR
V
= 0
CC
When V
falls below the minimum operating voltage,
CC
push-pull structured reset sinking (or sourcing) capabil-
ities decrease dramatically. 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
RESET
RESET
GENERATOR
V
REF
not operate at V
below +1V. For MXD1810/
CC
MXD1815 applications where RESET must be valid
down to V = 0, adding a pulldown resistor between
CC
RESET and GND removes stray leakage currents, hold-
ing RESET low (Figure 8). The pulldown resistor value is
not critical; 100kΩ is large enough not to load RESET
and small enough to pull RESET low. For MXD1812/
Figure 3. Functional Diagram, Open-Drain Active-Low Output
with Manual Reset Detection
6
_______________________________________________________________________________________
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
V
CC
V
TH
V
CC
V
CC
MXD1813
MXD1818
t
RP
RESET
RESET
V
CC(MIN)
RESET
RESET
GND
MANUAL
RESET
t
RP
Figure 5. Push-Button Manual Reset
Figure 4. Power-Up Reset Timing Diagram
V
CC
t
t
PBRST
PBRST
(OPEN)
SWITCH BOUNCE
EXTERNAL
PUSH BUTTON
(CLOSED)
RESET
Figure 6. Manual Reset Timing Diagram
MXD1817 applications where RESET must be valid to
condition when the supply voltage drops below the
V
V
= 0, a 100kΩ pullup resistor between RESET and
minimum V , but will drift to a nonactive level due to
CC
CC
CC
holds RESET high when V
falls below the mini-
the pullup resistor and the reduced sinking capability of
the open-drain output. Therefore, these devices are not
recommended for applications where the RESET pin is
CC
mum operating voltage (Figure 9).
The MXD1811/MXD1813/MXD1816/MXD1818 have
open-drain, active-low outputs with a pullup resistor
included internal to the devices. While using these
devices RESET will most likely not maintain an active
required to be valid at V
= 0.
CC
_______________________________________________________________________________________
7
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
Table 1. Device Marking Codes
V
CC
TOP MARK
PART
SOT23
FZIV
SC70
AEK
AHU
AHT
AHW
AEL
AHV
AHY
AHX
AEM
AEN
AIA
V
CC
MXD1810_R46
MXD1810_R44
MXD1810_R41
MXD1811_R46
MXD1811_R44
MXD1811_R41
MXD1812_R46
MXD1812_R44
MXD1812_R41
MXD1813_R46
MXD1813_R44
MXD1813_R41
MXD1815_R31
MXD1815_R29
MXD1815_R26
MXD1815_R23
MXD1815_R22
MXD1816_R31
MXD1816_R29
MXD1816_R26
MXD1816_R23
MXD1816_R22
MXD1817_R31
MXD1817_R29
MXD1817_R26
MXD1817_R23
MXD1817_R22
MXD1818_R31
MXD1818_R29
MXD1818_R26
MXD1818_R23
MXD1818_R22
V
CC
FZKD
FZKC
FZKF
FZIW
FZKE
FZKH
FZKG
FZIX
MXD1811
MXD1816
µP
RESET
RESET
GND
GND
Figure 7. Interfacing to Microprocessors with Bidirectional
Reset Pins
FZIY
FZKJ
FZKI
AHZ
AIE
V
CC
FZKN
FZIZ
AEO
AID
AIC
AIB
V
CC
FZKM
FZKL
FZKK
FZKR
FZKQ
FZKP
FZKO
FZJA
FZJB
FZKV
FZKU
FZKT
FZKS
FZKY
FZKX
FZJC
FZKW
FZJE
V
CC
MXD1810
MXD1815
µP
RESET
RESET
AII
GND
AIH
AIG
AIF
R
PULLDOWN*
GND
AEP
AEQ
AIM
AIL
*MXD1810/MXD1815 ONLY
Figure 8. Ensuring Valid RESET Output Down to V
(MXD1810/MXD1815 only)
= 0
CC
AIK
V
CC
AIJ
AIP
V
CC
AIO
AER
AIN
AEV
R
PULLUP*
V
CC
MXD1812
MXD1817
µP
RESET
RESET
GND
GND
*MXD1812/MXD1817 ONLY
Figure 9. Ensuring Valid RESET Output Down to V
(MXD1812/MXD1817 only)
= 0
CC
8
_______________________________________________________________________________________
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
Selector Guide
OPEN-DRAIN
RESET WITH
2.5V/3.0V/3.3V
SYSTEMS
PUSH-PULL
RESET
OPEN-DRAIN
PUSH-PULL
RESET
PART
5V SYSTEMS
PUSH-
BUTTON
DETECT
RESET
MXD1810
MXD1811
MXD1812
MXD1813
MXD1815
MXD1816
MXD1817
MXD1818
✔
✔
—
—
—
—
✔
✔
✔
✔
✔
—
—
—
✔
—
✔
—
—
✔
—
—
—
✔
✔
—
—
—
✔
✔
—
—
—
✔
—
—
—
—
—
—
—
✔
—
—
—
—
—
—
Reset Threshold Table
Ordering Information (continued)
PART†
TEMP. RANGE
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
-40oC to +105oC
PIN-PACKAGE
3 SOT23-3
3 SC70-3
SUFFIX
(_ _)
TYP. RESET
THRESHOLD (V)*
PART
MXD1811UR_ _-T
MXD1811XR_ _-T
MXD1812UR_ _-T
MXD1812XR_ _-T
MXD1813UR_ _-T
MXD1813XR_ _-T
MXD1815UR_ _-T
MXD1815XR_ _-T
MXD1816UR_ _-T
MXD1816XR_ _-T
MXD1817UR_ _-T
MXD1817XR_ _-T
MXD1818UR_ _-T
MXD1818XR_ _-T
MXD1810–MXD1813
MXD1810–MXD1813
MXD1810–MXD1813
MXD1815–MXD1818
MXD1815–MXD1818
MXD1815–MXD1818
MXD1815–MXD1818
MXD1815–MXD1818
46
44
41
31
29
26
23
22
4.62
4.37
4.12
3.06
2.88
2.55
2.31
2.18
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
*Factory-trimmed reset thresholds are nominally 1.5ꢀ at
room temperature.
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
†The MXD1810–MXD1813/MXD1815–MXD1818 are available
with factory-set 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. Other threshold voltages
may be available. Contact factory for availability.
Chip Information
TRANSISTOR COUNT: 709
PROCESS TECHNOLOGY: BiCMOS
_______________________________________________________________________________________
9
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
Package Information
10 ______________________________________________________________________________________
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
Package Information (continued)
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 without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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