TC1277-10ENB [MICROCHIP]
3-Pin Reset Monitors for 3.3V Systems; 3引脚复位监视器为3.3V系统
| 型号： | TC1277-10ENB |
| 厂家： | 
MICROCHIP |
| 描述： | 3-Pin Reset Monitors for 3.3V Systems |
| 文件： | 总12页 (文件大小：503K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Obsolete Device
TC1275/TC1276/TC1277
3-Pin Reset Monitors for 3.3V Systems
Features
General Description
• Precision VCC Monitor for 3.3V Systems
The TC1275/TC1276/TC1277 are cost-effective
system supervisor circuits designed to monitor VCC in
digital systems and provide a reset signal to the host
processor when necessary. No external components
are required.
• 100 ms Minimum RESET, RESET Output
Duration
• Output Valid to VCC = 1.2V
• VCC Transient Immunity
• Small 3-Pin SOT-23 Package
• No External Components
The reset output is driven active within 20 µs of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 ms after VCC
rises above the reset threshold. The TC1277 has an
active-high RESET output while the TC1275 and
TC1276 have an active-low RESET output. TC1275
and TC1277 each have a complimentary output while
the TC1276 has an open drain output. The output of the
TC1275 and TC1276 is valid down to VCC = 1.2V. The
TC1277 is valid down to VCC = 1.8V. All three devices
are available in a 3-Pin SOT-23 package.
Applications
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
Device Selection Table
The TC1275/TC1276/TC1277 devices are optimized to
reject fast transient glitches on the VCC line.
Part
Number
Temp.
Range
Order
Package
Typical Operating Circuit
TC1275-xENB Complimentary 3-Pin SOT-23 -40°C to +85°C
TC1276-xENB Open-Drain 3-Pin SOT-23 -40°C to +85°C
TC1277-xENB Complimentary 3-Pin SOT-23 -40°C to +85°C
V
CC
2
V
V
CC
CC
Processor
NOTE: “x” denotes a suffix for V threshold (see table below).
CC
1
RESET
Input
Suffix
Reset VCC Threshold (V)
RESET
5
3.06
2.88
2.55
TC1275
10
20
GND
3
GND
Package Type
3-Pin SOT-23
RESET
*(RESET)
1
TC1275
TC1276
TC1277
GND
3
VCC
2
*( ) is for TC1277
© 2007 Microchip Technology Inc.
DS21383C-page 1
TC1275/TC1276/TC1277
*Stresses above 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 above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage (VCC to GND) .............................+6.0V
RESET, RESET.......................... -0.3V to (VCC + 0.3V)
Input Current, VCC..............................................20 mA
Output Current, RESET, RESET........................20 mA
Power Dissipation (TA ≤ 70°C)
3-Pin SOT-23 (derate 4 mW/°C above +70°C)
................................................................230 mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range..............-65°C to +150°C
TC1275/TC1276/TC1277 ELECTRICAL SPECIFICATIONS
Recommended DC Operating Conditions: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Supply Voltage
Min
Typ
Max Units
Device
Test Conditions
VCC
1.2
1.8
—
—
5.5
5.5
V
TC1275, TC1276 Note 1
TC1277
DC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min
Typ
Max Units
Test Conditions
TC1275, TC1277 Note 1
VOH
IOH
Output Voltage @ 0-500μA
VCC – 0.5V VCC – 0.1V
—
V
Output Current @ 2.4 Volts
mA
V
V
CC = 5V
CC = 2.7V
—
—
13
1.3
—
—
TC1275
TC1277
Note 2
Note 2, Note 5
TC1275, TC1277 Note 3
IOL
ICC
Output Current @ 0.4 Volts
+10
30
—
mA
µA
Operating Current
V
V
V
CC < 5.5V
CCTP < VCC < 5.5V
CC < VCCTP
—
—
—
20
20
350
35
35
700
TC1276
TC1276
Note 3
Note 3
VCCTP-5 VCC Trip Point (TC1275/6/7-5)
VCCTP-10 VCC Trip Point (TC1275/6/7-10)
VCCTP-20 VCC Trip Point (TC1275/6/7-20)
2.98
2.80
2.47
—
3.06
2.88
2.55
9
3.15
2.97
2.64
—
V
V
Note 1
Note 1
Note 1
V
COUT
RP
Output Capacitance
pF
Internal Pull-Up Resistor
3.0
6.0
9.0
kΩ TC1276
AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min
Typ
Max Units
Test Conditions
tRST
tRPD1
tRPD2
tF
RESET Active Time
VCC Detect to RESET
VCC Detect to RESET
100
—
200
20
300
50
ms
µs TC1275, TC1276 VCC(LOW) = 1V, Figure 3-2
—
20
—
50
—
µs TC1277
µs
VCC(LOW) = 1V, Figure 3-4
Figure 3-2, Figure 3-4
VCC Slew Rate
300
(VCCTP(MAX) to VCCTP(MIN))
tR
VCC Slew Rate
0
—
—
ns
Figure 3-1, Figure 3-3
(VCCTP(MIN) to VCCTP(MAX))
tRPU1
tRPU2
VCC Detect to RESET
VCC Detect to RESET
100
100
200
200
300
300
ms TC1275, TC1276 Note 4, Figure 3-1
ms TC1277 Note 4, Figure 3-3
Note 1: All voltages referenced to ground.
2: Measured with V ≥ 2.7 volts.
CC
3: Measured with RESET output open for TC1275/TC1276; measured with RESET output open for TC1277.
4:
t = 5 µs.
R
5: A 1 kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using
the TC1276.
DS21383C-page 2
© 2007 Microchip Technology Inc.
TC1275/TC1276/TC1277
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(3-Pin SOT-23)
Symbol
Description
1
1
RESET
(TC1275/
TC1276)
RESET output remains low while VCC is below the reset voltage threshold, and
for 200 ms (100 ms minimum) after VCC rises above reset threshold. The output
stage of the TC1275 is complimentary. The output stage of the TC1276 is open-
drain.
RESET
(TC1277)
RESET output remains high while VCC is below the reset voltage threshold, and
for 200 ms (100 ms minimum) after VCC rises above reset threshold. The output
stage of the TC1277 is complimentary.
2
3
VCC
Supply voltage (1.2V to 5.5V TC1275 and TC1276, 1.8V to 5.5V TC1277).
Ground.
GND
© 2007 Microchip Technology Inc.
DS21383C-page 3
TC1275/TC1276/TC1277
3.0
3.1
APPLICATIONS INFORMATION
t
R
Operation – Power Monitor
The TC1275/TC1276/TC1277 provide the function
V
(MAX)
CCTP
of detecting out-of-tolerance power supply conditions
and warning a processor-based system of impending
power failure. When VCC is detected as out-of-
tolerance, the RESET signal is asserted. On power-up,
RESET is kept active for approximately 200 ms after
the power supply has reached the selected tolerance.
This allows the power supply and microprocessor to
stabilize before RESET is released.
V
CCTP
V
(MIN)
CCTP
V
CC
t
RPU2
V
OL
RESET
t
R
FIGURE 3-3:
Power Up (TC1277).
Timing Diagram –
V
(MAX)
CCTP
V
CCTP
V
(MIN)
CCTP
t
F
V
CC
V
CC
t
RPU
1
V
(MAX)
CCTP
V
CCTP
V
(MIN)
CCTP
V
OH
RESET
t
RPD2
FIGURE 3-1:
Timing Diagram – Power Up
(TC1275/TC1276).
t
F
V
OH
V
CC
RESET SLEWS WITH V
CC
RESET
V
(MAX)
CCTP
V
CCTP
FIGURE 3-4:
Timing Diagram –
V
(MIN)
CCTP
Power Down (TC1277).
t
RPD1
RESET
V
OL
FIGURE 3-2:
Timing Diagram – Power
Down (TC1275/TC1276).
DS21383C-page 4
© 2007 Microchip Technology Inc.
TC1275/TC1276/TC1277
3.2
VCC Transient Rejection
V
CC
The TC1275/TC1276/TC1277 provides accurate VCC
monitoring and reset timing during power-up, power-
down, and brownout/sag conditions, and rejects
negative-going transients (glitches) on the power
supply line. Figure 3-5 shows the maximum transient
duration vs. maximum negative excursion (overdrive)
for glitch rejection. Any combination of duration and
overdrive that lays under the curve will not generate a
reset signal. Combinations above the curve are
detected as a brownout or power-down. Transient
immunity can be improved by adding a capacitor in
close proximity to the VCC pin of the TC1275/TC1276/
TC1277.
V
TH
Overdrive
Duration
C
500
T
A
400
300
200
3.3
RESET Signal Integrity During
Power-Down
The TC1275 RESET output is valid to VCC = 1.2V.
Below this voltage the output becomes an "open
circuit" and does not sink current. This means CMOS
logic inputs to the μP will be floating at an undeter-
mined voltage. Most digital systems are completely
shut down well above this voltage. However, in situa-
tions where RESET must be maintained valid to
VCC = 0V, a pull-down resistor must be connected from
RESET to ground to discharge stray capacitances and
hold the output low (Figure 3-6). This resistor value,
though not critical, should be chosen such that it does
not appreciably load RESET under normal operation
(100 kΩ will be suitable for most applications). Simi-
larly, a pull-up resistor to VCC is required for the
TC1277 to ensure a valid high RESET for VCC below
1.8V.
TC1275/6/7
100
100
0
1
10
1000
RESET COMPARATOR OVERDRIVE,
- V ] (mV)
[V
CCTP
CC
FIGURE 3-5:
Maximum Transient
Duration Vs. Overdrive For Glitch Rejection At
+25°C.
V
CC
V
CC
TC1275
RESET
R1
100k
GND
FIGURE 3-6:
TO V = 0V.
ENSURING RESET VALID
CC
© 2007 Microchip Technology Inc.
DS21383C-page 5
TC1275/TC1276/TC1277
4.0
TYPICAL CHARACTERISTICS
Note: The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein are
not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Reset Delays vs.
V
CC
Detect To RESET (RESET)
Comparator Overdrive
T
= 25°C
A
300
200
T
= 25°C
A
100000
10000
1000
V
= 2V
100
0
100
10
1
10
1000 10000
SLEW RATE (V/ sec)
100
100000
4
5
0
1
2
3
V
µ
CC
COMPARATOR OVERDRIVE (V)
DS21383C-page 6
© 2007 Microchip Technology Inc.
TC1275/TC1276/TC1277
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
1
2
&
= part number code + temperature range
and voltage
TC1275 (V)
2.55
Code
DA
2.88
DB
3.06
DC
TC1276 (V)
2.55
Code
EA
2.88
EB
3.06
EC
TC1277 (V)
2.55
Code
FA
2.88
FB
3.06
FC
ex: 1275-20 = D A
3
represents year and quarter code
represents production lot ID code
4
© 2007 Microchip Technology Inc.
DS21383C-page 7
TC1275/TC1276/TC1277
3-Lead Plastic Small Outline Transistor (TT or NB) [SOT-23]
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
b
N
E
E1
2
1
e
e1
D
c
A
A2
φ
A1
L
Units
MILLIMETERS
Dimension Limits
MIN
NOM
MAX
Number of Pins
Lead Pitch
N
e
3
0.95 BSC
Outside Lead Pitch
Overall Height
e1
A
1.90 BSC
0.89
0.79
0.01
2.10
1.16
2.67
0.13
0°
–
0.95
–
1.12
1.02
0.10
2.64
1.40
3.05
0.60
10°
Molded Package Thickness
Standoff
A2
A1
E
Overall Width
–
Molded Package Width
Overall Length
Foot Length
E1
D
1.30
2.90
0.50
–
L
Foot Angle
φ
Lead Thickness
Lead Width
c
0.08
0.30
–
0.20
0.54
b
–
Notes:
1. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.25 mm per side.
2. Dimensioning and tolerancing per ASME Y14.5M.
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
Microchip Technology Drawing C04-104B
DS21383C-page 8
© 2007 Microchip Technology Inc.
TC1275/TC1276/TC1277
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
XX
X
/XX
Examples:
Reset VCC Temperature Package
Threshold
a)
b)
c)
TC1275-10ENBTR: 2.88V Reset Monitor
TC1275-15ENBTR: 2.55V Reset Monitor
TC1275-5ENBTR: 3.06V Reset Monitor
Range
Device:
TC1275: 3-Pin Reset Monitor - Complementary
TC1276: 3-Pin Reset Monitor - Open-Drain
TC1277: 3-Pin Reset Monitor - Complementary
a)
b)
c)
TC1276-10ENBTR: 2.88V Reset Monitor
TC1276-15ENBTR: 2.55V Reset Monitor
TC1276-5ENBTR:
3.06V Reset Monitor
Reset V
Threshold Voltage
5
10
15
=
=
=
3.06V
2.88V
2.55V
CC
a)
b)
c)
TC1277-10ENBTR: 2.88V Reset Monitor
TC1277-15ENBTR: 2.55V Reset Monitor
Temperature Range:
Package:
E
=
=
-40°C to +85°C
TC1277-5ENBTR:
3.06V Reset Monitor
NB
Plastic Small Outline Transistor (SOT-23), 3-lead
ꢀ 2007 Microchip Technology Inc.
DS21383C-page9
TC1275/TC1276/TC1277
NOTES:
DS21383C-page 10
ꢀ 2007 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, KEELOQ logo, microID, MPLAB, PIC,
PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and
SmartShunt are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
AmpLab, FilterLab, Linear Active Thermistor, Migratable
Memory, MXDEV, MXLAB, PS logo, SEEVAL, SmartSensor
and The Embedded Control Solutions Company are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, ECAN,
ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi,
MPASM, MPLAB Certified logo, MPLIB, MPLINK, PICkit,
PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal,
PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB,
rfPICDEM, Select Mode, Smart Serial, SmartTel, Total
Endurance, UNI/O, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2007, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona, Gresham, Oregon and Mountain View, California. The
Company’s quality system processes and procedures are for its PIC®
MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial
EEPROMs, microperipherals, nonvolatile memory and analog
products. In addition, Microchip’s quality system for the design and
manufacture of development systems is ISO 9001:2000 certified.
© 2007 Microchip Technology Inc.
DS21383C-page 11
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12/08/06
DS21383C-page 12
© 2007 Microchip Technology Inc.
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