MCP809M3-3.08/NOPB [TI]
1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3, SOT-23, 3 PIN;
| 型号： | MCP809M3-3.08/NOPB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3, SOT-23, 3 PIN 光电二极管 |
| 文件： | 总8页 (文件大小：177K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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June 2001
MCP809/MCP810
3-Pin Microprocessor Reset Circuits
General Description
Features
n Precise monitoring of 3V, 3.3V, and 5V supply voltages
n Fully specified over temperature
The MCP809/810 microprocessor supervisory circuits can
be used to monitor the power supplies in microprocessor
and digital systems. They provide a reset to the micropro-
cessor during power-up, power-down and brown-out condi-
tions.
n 140ms min. Power-On Reset pulse width, 240ms typical
Active-low RESET Output (MCP809)
Active-high RESET Output (MCP810)
The function of the MCP809/810 is to monitor the VCC
supply voltage, and assert a reset signal whenever this
voltage declines below the factory-programmed reset
threshold. The reset signal remains asserted for 240ms after
VCC rises above the threshold. The MCP809 has an
active-low RESET output, while the MCP810 has an
active-high RESET output.
n Guaranteed RESET Output valid for VCC≥1V
n Low Supply Current, 15µA typ.
n Power supply transient immunity
Applications
n Microprocessor Systems
n Computers
Seven standard reset voltage options are available, suitable
for monitoring 5V, 3.3V, and 3V supply voltages.
n Controllers
n Intelligent Instruments
n Portable/Battery-Powered Equipment
n Automotive
With a low supply current of only 15µA, the MCP809/810 are
ideal for use in portable equipment. The MCP809/MCP810
are available in the 3-pin SOT23 package.
Typical Application Circuit
Connection Diagram
20022302
( ) are for MCP810
20022301
© 2001 National Semiconductor Corporation
DS200223
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Ordering Information
Reset Threshold
MCP809 Supplied as
MCP809 Supplied as
3000 units, tape & reel
MCP809M3X-4.63
MCP809M3X-4.38
MCP809M3X-4.00
MCP809M3X-3.08
MCP809M3X-2.93
MCP809M3X-2.63
Package
Top Mark
SVB
Package
Type
(V)
1000 units, tape & reel
MCP809M3-4.63
MCP809M3-4.38
MCP809M3-4.00
MCP809M3-3.08
MCP809M3-2.93
MCP809M3-2.63
NSC Package
4.63
4.38
4.00
3.08
2.93
2.63
SUB
STB
SOT23-3
MF03A
SSB
SRB
SPB
Reset Threshold
MCP810 Supplied as
1000 units, tape & reel
MCP810M3-4.63
MCP810M3-4.38
MCP810M3-4.00
MCP810M3-3.08
MCP810M3-2.93
MCP810M3-2.63
MCP810 Supplied as
3000 units, tape & reel
MCP810M3X-4.63
MCP810M3X-4.38
MCP810M3X-4.00
MCP810M3X-3.08
MCP810M3X-2.93
MCP810M3X-2.63
Package
Top Mark
SNB
Package
Type
(V)
NSC Package
4.63
4.38
4.00
3.08
2.93
2.63
SLB
SKB
SOT23-3
MF03A
SJB
SHB
SGB
Custom voltages and improved accuracies are available, subject to minimum orders. Contact your local National Semiconductor Sales Office for information.
Pin Description
PIN
NAME
FUNCTION
3
GND
Ground reference
Active-low output. RESET remains low while VCC is below the reset threshold, and
for 240ms after VCC rises above the reset threshold.
RESET (MCP809)
1
2
Active-high output. RESET remains high while VCC is below the reset threshold, and
for 240ms after VCC rises above the reset threshold.
RESET (MCP810)
VCC
Supply Voltage (+5V, +3.3V, or +3.0V)
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2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Rating (Note 2)
2kV
Continuous Power Dissipation (TA = +70˚C)
SOT-23 (Note 3)
320mW
Ambient Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (soldering,
10sec)
−40˚C to +105˚C
125˚C
VCC
−0.3V to 6.0V
−0.3V to (VCC+ 0.3V)
20mA
RESET, RESET
Input Current, VCC Pin
Output Current, RESET, RESET
Pin
−65˚C to +160˚C
+300˚C
20mA
Rate of Rise, VCC
100V/µs
Electrical Characteristics
VCC = full range, TA = −40˚C to +105˚C, unless otherwise noted. Typical values are at TA = +25˚C, VCC = 5V for
4.63/4.38/4.00 versions, VCC = 3.3V for 3.08/2.93 versions, and VCC = 3V for 2.63 version. (Note 4)
Symbol
Parameter
Conditions
TA = 0˚C to +70˚C
TA = −40˚C to +105˚C
Min
1.0
1.2
Typ
Max
5.5
5.5
60
Units
VCC Range
V
<
TA = −40˚C to
+85˚C
VCC 5.5V, MCP8_ _
18
15
-4.63/4.38/4.00
<
VCC 3.6V, MCP8_ _
50
-3.08/2.93/2.63
ICC
Supply Current
µA
<
TA = +85˚C to
+105˚C
VCC 5.5V, MCP8_ _
100
100
-4.63/4.38/4.00
<
VCC 3.6V, MCP8_ _
-3.08/2.93/2.63
TA = +25˚C
4.56
4.50
4.40
4.31
4.25
4.16
3.93
3.89
3.80
3.04
3.00
2.92
2.89
2.85
2.78
2.59
2.55
2.50
4.63
4.38
4.00
3.08
2.93
2.63
4.70
4.75
4.86
4.45
4.50
4.56
4.06
4.10
4.20
3.11
3.15
3.23
2.96
3.00
3.08
2.66
2.70
2.76
MCP8_ _ -4.63 TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
MCP8_ _ -4.38 TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
MCP8_ _ -4.00 TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
VTH
Reset Threshold (Note 5)
V
TA = +25˚C
MCP8_ _ -3.08 TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
MCP8_ _ -2.93 TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
MCP8_ _ -2.63 TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
Reset Threshold
30
ppm/˚C
µs
Temperature Coefficient
VCC to Reset Delay (Note 5) VCC = VTH to (VTH − 100mV)
20
TA = −40˚C to +85˚C
Reset Active Timeout Period
140
240
560
ms
TA = +85˚C to +105˚C
100
840
3
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Electrical Characteristics (Continued)
VCC = full range, TA = −40˚C to +105˚C, unless otherwise noted. Typical values are at TA = +25˚C, VCC = 5V for
4.63/4.38/4.00 versions, VCC = 3.3V for 3.08/2.93 versions, and VCC = 3V for 2.63 version. (Note 4)
Symbol
Parameter
Conditions
VCC = VTH min, ISINK = 1.2mA,
MCP809-2.63/2.93/3.08
Min
Typ
Max
Units
0.3
RESET Output Voltage Low
(MCP809)
VOL
VCC = VTH min, ISINK = 3.2mA,
MCP809-4.63/4.38/4.00
0.4
0.3
V
>
VCC 1.0V, ISINK = 50µA
>
VCC VTH max, ISOURCE = 500µA,
0.8VCC
MCP809-2.63/2.93/3.08
RESET Output Voltage High
(MCP809)
VOH
V
>
VCC VTH max, ISOURCE = 800µA,
VCC−1.5
MCP809-4.63/4.38/4.00
VCC = VTH max, ISINK = 1.2mA,
MCP810-2.63/2.93/3.08
0.3
0.4
RESET Output Voltage Low
(MCP810)
VOL
V
V
VCC = VTH max, ISINK = 3.2mA,
MCP810-4.63/4.38/4.00
VOH
RESET Output Voltage High
(MCP810)
0.8VCC
<
<
1.8V VCC VTH min, ISOURCE = 150µA
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which the device operates
correctly. Operating ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics.
Note 2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 3: Production testing done at T = +25˚C, over temperature limits guaranteed by design only.
A
Note 4: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the SOT23-3 package must be derated at 4mW/˚C
at ambient temperatures above 70˚C. The device has internal thermal protection.
Note 5: RESET Output for MCP809, RESET output for MCP810.
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4
Typical Performance Characteristics
Supply Current vs Temperature
(No Load, MCP8_ _-2.63/2.93/3.08)
Supply Current vs Temperature
(No Load, MCP8_ _-4.63/4.38)
Power-Down Reset Delay vs Temp
(MCP8_ _-2.63/2.93/3.08)
20022303
20022304
20022305
Power-Down Reset Delay vs
Temperature (MCP8_ _-4.63/4.38)
Power-Up Reset Timeout vs
Temperature
Normalized Reset Threshold vs
Temperature
20022306
20022308
20022307
5
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can have without causing a reset pulse. In general, as the
magnitude of the transient increases, going further below the
threshold, the maximum allowable pulse width decreases.
Typically, for the 4.63V and 4.38V version of the
MCP809/810, a VCC transient that goes 100mV below the
reset threshold and lasts 20µs or less will not cause a reset
pulse. A 0.1 µF bypass capacitor mounted as close as
possible to the VCC pin will provide additional transient re-
jection.
Applications Information
Benefits of Precision Reset Thresholds
A microprocessor supply supervisor must provide a reset
output within a predictable range of the supply voltage. A
common threshold range is between 5% and 10% below the
nominal supply voltage. The 4.63V and 3.08V options of the
MCP809/810 use highly accurate circuitry to ensure that the
reset threshold occurs only within this range (for 5V and 3.3V
supplies). The other voltage options have the same tight
tolerance to ensure a reset signal for other narrow monitor
ranges. See Table 1 for examples of how the standard reset
thresholds apply to 3V, 3.3V, and 5V nominal supply volt-
ages.
TABLE 1. Reset Thresholds Related to Common
Supply Voltages
Reset
3.0V
3.3V
5.0V
Threshold
±
4.63 3%
90 - 95%
85 - 90%
78 - 82%
±
4.38 3%
±
4.00 3%
±
3.08 3%
90 - 95%
86 - 90%
77 - 81%
20022309
±
2.93 3%
FIGURE 2. Maximum Transient Duration without
Causing a Reset Pulse vs. Reset Comparator
Overdrive
±
2.63 3%
85 - 90%
Ensuring a Valid Reset Output Down to VCC = 0V
Interfacing to µPs with Bidirectional Reset Pins
When VCC falls below 1V, the MCP809 RESET output no
longer sinks current. A high-impedance CMOS logic input
connected to RESET can therefore drift to undetermined
voltages. To prevent this situation, a 100kΩ resistor should
be connected from the RESET output to ground, as shown in
Figure 1.
Microprocessors with bidirectional reset pins, such as the
Motorola 68HC11 series, can be connected to the MCP809
RESET output. To ensure a correct output on the MCP809
even when the microprocessor reset pin is in the opposite
state, connect a 4.7kΩ resistor between the MCP809 RE-
SET output and the µP reset pin, as shown in Figure 3.
Buffer the MCP809 RESET output to other system compo-
nents.
A 100kΩ pull-up resistor to VCC is also recommended for the
<
MCP810, if RESET is required to remain valid for VCC 1V.
20022310
FIGURE 1. RESET Valid to VCC = Ground Circuit
Negative-Going VCC Transients
20022311
The MCP809/810 are relatively immune to short
negative-going transients or glitches on VCC. Figure 2 shows
the maximum pulse width a negative-going VCC transient
FIGURE 3. Interfacing to Microprocessors with
Bidirectional Reset I/O
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6
Physical Dimensions inches (millimeters)
unless otherwise noted
3-Lead SOT23-3
For Ordering, refer to Ordering Information table
NS Package Number MF03A
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