TC1271RERCTRG [MICROCHIP]
1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4, SOT-143, 4 PIN;
| 型号： | TC1271RERCTRG |
| 厂家： | 
MICROCHIP |
| 描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4, SOT-143, 4 PIN 监视器 |
| 文件： | 总14页 (文件大小：662K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC1270/TC1271
4-Pin Reset Monitors
Features:
General Description
• Precision VCC Monitor for 1.8V, 2.7V, 3.0V, 3.3V
and 5.0V Nominal Supplies
The TC1270 and TC1271 are cost-effective system
supervisor circuits designed to monitor VCC in digital
systems and provide a reset signal to the host
processor when necessary. A manual reset input is
provided to override the reset monitor, and is suitable
for use as a push button reset. No external components
are required.
• Manual Reset Input
• 140 ms Minimum RESET, Reset Output Duration
• RESET Output Valid to VCC = 1.0V (TC1270)
• Low 7 µA Supply Current
• VCC Transient Immunity
The reset output is driven active within 20 µs (4 µs for
F version) of VCC falling through the reset voltage
threshold. Reset is maintained active for a minimum of
140 ms after VCC rises above the reset threshold. The
TC1271 has an active-high RESET output while the
TC1270 has an active-low RESET output. The output
of the TC1270 is valid down to VCC = 1V. Both devices
are available in a 4-Pin SOT-143 package.
• Small 4-Pin SOT-143 Package
• No External Components
• Replacement for MAX811/812 and Offers a Lower
Threshold Voltage Option
Applications:
• Computers
The TC1270/TC1271 devices are optimized to reject
fast transient glitches on the VCC line. Low supply
current of 7 µA (VCC = 3.3V) makes these devices
suitable for battery powered applications.
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
Package Type
Typical Operating Circuit
V
CC
V
V
CC
CC
VCC
4
3
1
2
GND
Processor
Reset
Input
MR
RESET
TC1270
TC1271
Push
Button
(Active Low)
TC1270
TC1270 RESET
TC1271 (RESET)
GND
GND
MR
© 2007 Microchip Technology Inc.
DS21381D-page 1
TC1270/TC1271
†
Stresses above those listed under “Absolute
1.0
ELECTRICAL
CHARACTERISTICS
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.
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
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range..............-65°C to +150°C
ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, VCC = 2.0V for F
version. Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C. (Note 1).
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
VCC
ICC
VCC Range
1.2
—
—
—
—
7
5.5
15
15
12
V
Supply Current
µA
µA
µA
VCC > VTH, for L/M/R/S/T/F
VCC < VTH, for L/M/R/S/T
VCC < VTH, for F
10
6
VTH
Reset Threshold
4.54
4.50
4.63
—
4.72
4.75
V
V
TC127_L; TA = +25°C
TA = -40°C to +85°C
4.30
4.25
4.38
—
4.46
4.50
V
V
TC127_M; TA = +25°C
TA = -40°C to +85°C
3.03
3.00
3.08
—
3.14
3.15
V
V
TC127_T; TA = +25°C
TA = -40°C to +85°C
2.88
2.85
2.93
—
2.98
3.00
V
V
TC127_S; TA = +25°C
TA = -40°C to +85°C
2.58
2.55
2.63
—
2.68
2.70
V
V
TC127_R; TA = +25°C
TA = -40°C to +85°C
1.71
1.70
1.75
—
1.79
1.80
V
V
TC127_F; TA = +25°C
TA = -40°C to +85°C
Reset Threshold Tempco
VCC to Reset Delay
—
30
—
ppm/°C
µs
—
—
20
5
—
—
VCC = VTH to VTH – 125 mV;
L/M/R/S/T/F
tRP
tMR
Reset Active Time-out Period
MR Minimum Pulse Width
MR Glitch Immunity
140
10
280
—
560
—
ms
µs
µs
µs
V
VCC = VTH(MAX)
—
0.1
0.5
—
—
tMD
VIH
MR to Reset Propagation Delay
MR Input Threshold
—
—
2.3
—
VCC > VTH(MAX), TC127_L/M
VCC > VTH(MAX), TC127_R/S/T/F
VCC > VTH(MAX), TC127_L/M
VCC > VTH(MAX), TC127_R/S/T/F
0.7 VCC
—
—
—
V
VIL
—
0.8
V
—
—
0.15 VCC
40
V
MR Pull-up Resistance
10
20
—
kΩ
V
VOH
Reset Output Voltage High
(TC1271)
0.8 VCC
—
ISOURCE = 150 µA;
VCC ≤ VTH(MIN)
Note 1: Production testing done at TA = +25°C, over temperature limits ensured by design.
2: RESET output for TC1270, Reset output for TC1271.
DS21381D-page 2
© 2007 Microchip Technology Inc.
TC1270/TC1271
ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, VCC = 2.0V for F
version. Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C. (Note 1).
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
TC1271F only,
SINK = 500 µA,
CC = VTH(MAX)
TC1271R/S/T only,
SINK = 1.2 mA, VCC = VTH(MAX)
TC1271L/M only, ISINK = 3.2 mA,
CC = VTH(MAX)
TC1270R/S/T only,
SINK = 1.2 mA, VCC = VTH(MIN)
TC1270F only:
SINK = 500 µA, VCC = VTH(MIN)
TC1270L/M only,
SINK = 3.2 mA, VCC = VTH(MIN)
VOL
Reset Output Voltage Low
(TC1271)
—
—
0.2
V
I
V
—
—
—
—
—
—
0.3
0.4
0.3
V
V
V
I
V
VOL
RESET Output Voltage Low
(TC1270)
I
I
—
—
—
—
0.4
TBD
V
V
I
ISINK = 50 µA, VCC > 1.0V
VOH
RESET Output Voltage High
(TC1270)
VCC – 1.5
0.8 VCC
—
—
—
—
V
V
TC1270L/M only,
I
SOURCE = 800 µA,
CC = VTH(MAX)
TC1270R/S/T/F only,
SOURCE = 500 µA,
CC = VTH(MAX)
V
I
V
Note 1: Production testing done at TA = +25°C, over temperature limits ensured by design.
2: RESET output for TC1270, Reset output for TC1271.
© 2007 Microchip Technology Inc.
DS21381D-page 3
TC1270/TC1271
2.0
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.
Supply Current vs.Temperature
(No Load, TC127xR/S/T/F)
Supply Current vs.Temperature
(No Load, TC127xL/M)
14
12
8
6
10
8
V
= 5V
CC
V
= 5V
CC
4
2
V
= 3V
CC
V
= 3V
6
CC
V
= 1V
CC
4
V
= 1V
CC
2
0
-40
0
-20
0
20
40
60
85
-40
-20
0
20
40
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
Power-Down Reset Delay vs. Temperature
(TC127xL/M/R/S/T)
Power-Down Reset Delay vs. Temperature
(TC127xF)
50
40
50
L/M
V
= 20 mV
OD
V
= 100 mV
OD
40
30
V
= 200 mV
OD
30
20
10
V
= 20mV
OD
R/S/T
20
V
= 200 mV
V
OD
= 100 mV
V
= 20 mV
OD
OD
10
0
V
= 100mV
60
OD
V
= 200 mV
-20
OD
0
-40
-40
0
40
20
85
-20
0
40
60
20
85
TEMPERATURE (°C)
TEMPERATURE (°C)
Normalized Reset Threshold vs. Temperature
Power-Up Reset Time-out vs. Temperature
1.0030
1.0020
1.0010
1.0000
0.9990
250
245
240
235
TC127xL/M
0.9980
TC127xR/S/T/F
0.9970
0.9960
0.9950
0.9940
230
225
60
65
10
35
-40
-20
0
40
TEMPERATURE (°C)
60
-40
-15
20
85
TEMPERATURE (°C)
DS21381D-page 4
© 2007 Microchip Technology Inc.
TC1270/TC1271
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
Pin No.
PIN FUNCTION TABLE
Symbol
Description
1
2
GND
Ground
RESET
(TC1270)
RESET output remains low while VCC is below the Reset voltage threshold,
and for at least 140 ms min. after VCC rises above Reset threshold
2
RESET
(TC1271)
Reset output remains high while VCC is below the Reset voltage threshold,
and for at least 140 ms min. after VCC rises aboev Reset threshold
3
4
MR
Manual Reset input generates a Reset when MR is below VIL
Supply voltage
VCC
3.1
Ground Terminal (GND)
3.4
Manual Reset (MR)
GND provides the negative reference for the analog
input voltage. Typically, the circuit ground is used.
The Manual Reset (MR) input pin allows a push button
switch to easily be connected to the system. When the
push button is depressed, it forces a system Reset.
This pin has circuitry that filters noise that may be
present on the MR signal.
3.2
Reset Output (RESET) (TC1270)
RESET output remains low while VCC is below the
Reset voltage threshold (VTRIP). Once the device
voltage (VCC) returns to a high level (VTRIP + VHYS), the
device will remain in Reset for the Reset delay timer
(TRST). After that time expires, the RESET pin will be
driven to the high state.
The MR pin is active-low and has an internal pull-up
resistor.
3.5
Supply Voltage (VCC)
VCC can be used for power supply monitoring or a
voltage level that requires monitoring.
3.3
Reset Output (RESET) (TC1271)
RESET output remains high while VCC is below the
Reset voltage threshold (VTRIP). Once the device
voltage (VCC) returns to a high level (VTRIP + VHYS), the
device will remain in Reset for the Reset delay timer
(TRST). After that time expires, the RESET pin will be
driven to the low state.
© 2007 Microchip Technology Inc.
DS21381D-page 5
TC1270/TC1271
be connected from RESET to ground to discharge stray
capacitances and hold the output low (Figure 4-2). This
resistor value, though not critical, should be chosen
such that it does not appreciably load RESET under
4.0
4.1
APPLICATIONS INFORMATION
VCC Transient Rejection
normal operation
(100 kΩ will be suitable for most
The TC1270/TC1271 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 4-3 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 brown-out or power-down. Transient
immunity can be improved by adding a capacitor in
close proximity to the VCC pin of the TC1270/TC1271.
applications). Similarly, a pull-up resistor to VCC is
required for the TC1271 to ensure a valid high RESET
for VCC below 1.1V.
V
CC
V
CC
TC1270
RESET
V
CC
R1
100k
GND
V
TH
Overdrive
FIGURE 4-2:
= 0V.
Ensuring RESET Valid to
V
CC
Duration
4.3
Processors With Bidirectional
I/O Pins
400
T
= +25°C
A
320
240
160
Some microprocessor’s (such as Motorola 68HC11)
have bidirectional Reset pins. Depending on the
current drive capability of the processor pin, an indeter-
minate logic level may result if there is a logic conflict.
This can be avoided by adding a 4.7 kΩ resistor in
series with the output of the TC1270/TC1271
(Figure 4-3). If there are other components in the sys-
tem which require a Reset signal, they should be buff-
ered so as not to load the Reset line. If the other
components are required to follow the Reset I/O of the
microprocessor, the buffer should be connected as
shown with the solid line.
TC127LMJ
80
0
TC127xR/S/T
1
10
1000
100
RESET COMPARATOR OVERDRIVE,
- V (mV)
V
TH
CC
Buffered RESET
To Other System
Components
Buffer
FIGURE 4-1:
Maximum Transient
Duration vs. Overdrive for Glitch Rejection at
+25°C.
V
CC
V
V
CC
μP
RESET
CC
4.2
Reset Signal Integrity During
Power-Down
TC1270
RESET
4.7k
The TC1270 RESET output is valid to VCC = 1.0V.
Below this voltage the output becomes an “open circuit”
and does not sink current. This means CMOS logic
inputs to the microprocessor will be floating at an
undetermined voltage. Most digital systems are
completely shut down well above this voltage.
However, in situations where RESET must be
maintained valid to VCC = 0V, a pull-down resistor must
GND
GND
FIGURE 4-3:
Reset I/O.
Interfacing to Bidirectional
DS21381D-page 6
© 2007 Microchip Technology Inc.
TC1270/TC1271
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
TC1270
Code
Part Number
(V)
TC1270LERCTR
TC1270MERCTR
TC1270TERCTR
TC1270SERCTR
TC1270RERCTR
TC1270FERCTR
4.63
4.38
3.08
2.93
2.63
1.75
S1
S2
S3
S4
S5
S7
1
1
2
3
4
TC1271
Code
Part Number
(V)
TC1271LERCTR
TC1271MERCTR
TC1271TERCTR
TC1271SERCTR
TC1271RERCTR
TC1271FERCTR
4.63
4.38
3.08
2.9
T1
T2
T3
T4
T5
T7
1
2
&
= part number code + threshold voltage
(two-digit code)
2.63
1.75
3
4
represents year and quarter code
represents production lot ID code
5.2
Taping Form
User Direction of Feed
Device
Marking
W, Width
Pin 1
of Carrier
Tape
Pin 1
P, Pitch
Reverse Reel Component Orientation
Standard Reel Component Orientation
for TR Suffix Device
(Mark Right Side Up)
Package
4-Pin SOT-143
Carrier Width (W)
8 mm
Pitch (P)
Part Per Full Reel
Reel Size
4 mm
3000
7 in.
© 2007 Microchip Technology Inc.
DS21381D-page 7
TC1270/TC1271
4-Lead Plastic Small Outline Transistor (RC) [SOT-143]
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
D
e
e/2
N
E
E1
1
2
e1
A2
A
c
φ
A1
L
L1
b
3X
b2
Units
MILLIMETERS
Dimension Limits
MIN
NOM
MAX
Number of Pins
Pitch
N
e
4
1.92 BSC
Pin1 Offset
Overall Height
e1
A
0.20 BSC
0.80
0.75
0.01
2.10
1.20
2.67
0.13
–
1.22
1.07
0.15
2.64
1.40
3.05
0.60
Molded Package Thickness
Standoff §
A2
A1
E
0.90
–
Overall Width
–
Molded Package Width
Overall Length
Foot Length
E1
D
1.30
2.90
L
0.50
Footprint
L1
φ
0.54 REF
Foot Angle
0°
–
–
–
–
8°
Lead Thickness
Lead 1 Width
c
0.08
0.76
0.30
0.20
0.94
0.54
b1
b
Leads 2, 3 & 4 Width
Notes:
1. § Significant Characteristic.
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.
REF: Reference Dimension, usually without tolerance, for information purposes only.
Microchip Technology Drawing C04-031B
DS21381D-page 8
© 2007 Microchip Technology Inc.
TC1270/TC1271
APPENDIX A: REVISION HISTORY
Revision D (February 2007)
• Section 5.0 “Packaging Information”:
Corrected SOT-143 Packaging Information.
• Section 3.0 “Pin Descriptions”: Added pin
descriptions.
• Added disclaimer on package outline drawing.
• Updated package outline drawing.
• Section 1.0 “Electrical Characteristics”: Refo-
matted table.
Revision C (June 2006)
• Enhanced SOT-143 Packaging Information.
Revision B (May 2002)
• Undocumented changes.
Revision A (March 2002)
• Original Release of this Document.
© 2007 Microchip Technology Inc.
DS21381D-page 9
TC1270/TC1271
NOTES:
DS21381D-page 10
© 2007 Microchip Technology Inc.
TC1270/TC1271
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
X
X
XX
Examples:
Threshold Temperature Package
Voltage
a)
b)
c)
d)
e)
f)
TC1270LERCTR:
TC1270MERCTR:
TC1270TERCTR:
4.63V
4.38V
3.08V
Range
TC1270SERCPBTR: 2.93V
TC1270SERCTR:
TC1270RERCTR:
TC1270FERCTR:
2.93V
2.63V
1.75V
Device
TC1270: 4-Pin RESET Monitor
TC1271: 4-Pin RESET Monitor
g)
Threshold voltage
(typical)
L
=
=
=
=
=
=
4.63
4.38
3.08
2.93
2.63
1.75
a)
b)
c)
d)
e)
f)
TC1271LERCTR:
TC1271MERCTR:
TC1271TERCTR:
TC1271SERCTR:
TC1271RERCTR:
TC1271FERCTR:
4.63V
4.38V
3.08V
2.93V
2.63V
1.75V
M
T
S
R
F
Temperature Range
Package
E
= -40°C to +85°C
RCTR
=
Plastic small outline transistor (RC) SOT-143,
4 lead, (tape and reel).
© 2007 Microchip Technology Inc.
DS21381D-page 11
TC1270/TC1271
NOTES:
DS21381D-page 12
© 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.
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WARRANTIES OF ANY KIND WHETHER EXPRESS OR
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OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
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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,
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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,
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SQTP is a service mark of Microchip Technology Incorporated
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All other trademarks mentioned herein are property of their
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© 2007, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
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Company’s quality system processes and procedures are for its PIC®
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EEPROMs, microperipherals, nonvolatile memory and analog
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manufacture of development systems is ISO 9001:2000 certified.
© 2007 Microchip Technology Inc.
DS21381D-page 13
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Tel: 49-89-627-144-0
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Japan - Yokohama
Tel: 81-45-471- 6166
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Italy - Milan
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China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
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Fax: 886-7-536-4803
Los Angeles
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Fax: 949-462-9608
China - Shunde
Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
Taiwan - Taipei
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Fax: 886-2-2508-0102
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China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
China - Xian
Tel: 86-29-8833-7250
Fax: 86-29-8833-7256
12/08/06
DS21381D-page 14
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