TC1272 [MICROCHIP]
3-Pin Reset Monitors for 5V Systems; 3引脚复位监视器用于5V系统
| 型号： | TC1272 |
| 厂家： | 
MICROCHIP |
| 描述： | 3-Pin Reset Monitors for 5V Systems |
| 文件： | 总12页 (文件大小：223K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC1272/TC1273/TC1274
M
3-Pin Reset Monitors for 5V Systems
Features
General Description
• Precision V Monitor for 5.0V Systems
• 100 msec Minimum RESET, RESET Output
Duration
The TC1272/TC1273/TC1274 are cost-effective
CC
system supervisor circuits designed to monitor V in
CC
digital systems and provide a reset signal to the host
processor when necessary. No external components
are required.
• Output Valid to V = 1.2V
CC
• V Transient Immunity
CC
The reset output is driven active within 20 µsec of V
CC
• Small 3-Pin SOT-23B Package
• No External Components
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 msec after
V
rises above the reset threshold. The TC1274 has
CC
Applications
• Computers
• Embedded Systems
• Battery-Powered Equipment
an active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET output. The
TC1272 and TC1274 each have a complimentary out-
put, while the TC1273 has an open-drain output. The
output of the TC1272 and TC1273 is valid down to V
CC
• Critical µP Power Supply Monitoring
= 1.2V. The TC1274 is valid down to V
= 1.8V. All
CC
three devices are available in a 3-Pin SOT-23B
package.
Package Type
3-Pin SOT-23B*
The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the V line.
CC
RESET
1
Typical Operating Circuit
**(RESET)
VCC
TC1272
TC1273
TC1274
2
VCC
3
GND
VCC
VCC
2
1
RESET
RESET
Input
Processor
TC1272
* 3-Pin SOT-23B is equivalent to JEDEC TO-236
**( ) is for TC1274
GND
3
GND
2003 Microchip Technology Inc.
DS21382B-page 1
TC1272/TC1273/TC1274
† Stresses above those listed under "Absolute Maximum Rat-
ings" 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. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Supply Voltage (V to GND) .............................+6.0V
CC
RESET, RESET.......................... -0.3V to (V + 0.3V)
CC
Input Current, V ..............................................20 mA
CC
Output Current, RESET, RESET........................20 mA
Power Dissipation (T ≤ 70°C)
A
3-Pin SOT-23B (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
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Supply Voltage
TC1272, TC1273
TC1274
Output Voltage @ 0-500 µA
VCC
VCC
VOH
1.2
1.8
—
—
5.5
5.5
—
V
V
V
Note 1
TC1272, TC1274 (Note 1)
VCC – 0.5V VCC – 0.1V
Output Current @ 2.4 Volts
VCC = 5V TC1272
VCC = 4V TC1274
Output Current @ 0.4 Volts
Operating Current
VCC < 5.5V: TC1272, TC1274
IOH
IOH
IOL
—
—
+10
10
8
30
—
—
—
mA Note 2
mA
mA Note 2, Note 5
ICC
ICC
ICC
—
—
—
4.50
4.25
4.00
—
17
17
40
40
µA
µA
µA
V
V
V
Note 3
Note 3
Note 3
Note 1
Note 1
Note 1
VCCTP < VCC < 5.5V: TC1273
VCC < VCCTP: TC1273
VCC Trip Point (TC1272/3/4-5) VCCTP-5
VCC Trip Point (TC1272/3/4-10) VCCTP-10
VCC Trip Point (TC1272/3/4-15) VCCTP-15
700
4.62
4.37
4.12
9
1200
4.75
4.49
4.24
—
Output Capacitance
Internal Pull-Up Resistor
COUT
RP
pF
kΩ
3
6
9
AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
RESET Active Time
VCC Detect to RESET
TC1272, TC1273
tRST
tRPD1
100
—
200
20
300
50
msec
µsec VCC(LOW) = 1V, Figure 4-2
VCC Detect to RESET - TC1274
VCC Slew Rate
(VCCTP(MAX) to VCCTP(MIN))
tRPD2
tF
—
300
20
—
50
—
µsec VCC(LOW) = 1V, Figure 4-4
µsec Figure 4-2, Figure 4-4
VCC Slew Rate
tR
0
—
—
nsec Figure 4-1, Figure 4-3
msec Note 4, Figure 4-1
msec Note 4, Figure 4-3
(VCCTP(MIN) to VCCTP(MAX))
VCC Detect to RESET
TC1272, TC1273
VCC Detect to RESET - TC1274
tRPU1
100
100
200
200
300
300
tRPU2
Note 1: All voltages referenced to ground.
2: Measured with VCC ≥ 2.7 volts.
3: Measured with RESET output open for TC1272/TC1273; measured with RESET output open for TC1274.
4:
tR = 5 µsec.
5: A 1 kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control
circuit when using the TC1273.
DS21382B-page 2
2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
2.0
TYPICAL PERFORMANCE CURVES
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.
Note: Unless otherwise indicated, T = -40°C to +85°C. Typical values are at T = +25°C.
A
A
Comparator Overdrive voltage (V ) is defined in Figure 4-5
OD
300
T
= 25°C
A
T
= 25°C
A
100000
10000
1000
V
= 20mV
OD
200
V
= 100mV
OD
V
= 200mV
OD
V
= 1V
OD
V
= 2V
OD
100
0
100
10
1
10
V
1000 10000
SLEW RATE (V/ sec)
100
100000
4
5
0
1
2
3
µ
COMPARATOR OVERDRIVE (V)
CC
FIGURE 2-1:
V
Detect to Reset
FIGURE 2-2:
Reset Delays vs.
CC
(RESET).
Comparator Overdrive.
2003 Microchip Technology Inc.
DS21382B-page 3
TC1272/TC1273/TC1274
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
Pin No.
PIN FUNCTION TABLES
Symbol
Function
1
1
2
3
RESET
RESET
RESET Output (TC1272 and TC1273)
RESET Output (TC1274)
V
Supply voltage (1.2V to 5.5V TC1272 and TC1273; 1.8V to 5.5V TC1274)
Ground
CC
GND
3.1
RESET Output (RESET)
3.2
RESET Output (RESET)
The RESET output remains low while V is below the
The RESET output remains high while V is below the
CC
CC
reset voltage threshold, and for 200 msec (100 msec
reset voltage threshold, and for 200 msec (100 msec
min.) after V rises above reset threshold. The output
min.) after V rises above reset threshold. The output
CC
CC
stage of the TC1272 is complimentary, while the output
stage of the TC1273 is open-drain.
stage of the TC1274 is complimentary.
DS21382B-page 4
2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
4.0
4.1
APPLICATIONS INFORMATION
Operation – Power Monitor
tR
The TC1272/TC1273/TC1274 is designed to function
V
(MAX)
CCTP
as a voltage monitor for +5V systems. These devices
VCCTP
VCCTP(MIN)
provide a RESET signal to indicate that the V
has
CC
dropped below a preset voltage level that is selected by
the suffix part number. In addition, the RESET is held
active for approximately 200 ms after the power supply
has risen above the voltage threshold level to allow
time for the power supply to stabilize before system
operation commences.
VCC
tRPU2
VOL
RESET
tR
FIGURE 4-3:
Timing Diagram – Power Up
VCCTP(MAX)
VCCTP
VCCTP(MIN)
(TC1274).
VCC
t
F
tRPU1
VCC
VCCTP(MAX)
VOH
VCCTP
VCCTP(MIN)
RESET
tRPD2
FIGURE 4-1:
Timing Diagram – Power Up
(TC1272/TC1273).
VOH
t
F
RESET Slews With VCC
VCC
RESET
VCCTP(MAX)
VCCTP
FIGURE 4-4:
Timing Diagram –
VCCTP(MIN)
Power Down (TC1274).
tRPD1
RESET
VOL
FIGURE 4-2:
Timing Diagram – Power
Down (TC1272/TC1273).
2003 Microchip Technology Inc.
DS21382B-page 5
TC1272/TC1273/TC1274
4.2
V
Transient Rejection
CC
The TC1272/TC1273/TC1274 provides accurate V
VCC
CC
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 4-5 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 condition.
Transient immunity can be improved by adding a
VTH
Overdrive
Duration
500
400
TA = +25°C
capacitor in close proximity to the V
TC1272/TC1273/TC1274.
pin of the
CC
4.3
RESET Signal Integrity During
Power-Down
300
200
The TC1272 RESET output is valid to V
= 1.2V.
CC
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
TC1272/3/4
100
0
1
10
1000
100
V
= 0V, a pull-down resistor must be connected from
RESET COMPARATOR OVERDRIVE,
[VCCTP-VCC] (mV)
CC
RESET to ground to discharge stray capacitances and
hold the output low (Figure 4-6). 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-
FIGURE 4-5:
Maximum Transient
Duration vs. Overdrive For Glitch Rejection At
+25°C.
larly, a pull-up resistor to V
is required for the
CC
TC1274 to ensure a valid high RESET for V
1.8V.
below
CC
VCC
VCC
TC1272
RESET
R1
GND
100 kΩ
FIGURE 4-6:
= 0V.
Ensuring Reset Valid To
V
cc
DS21382B-page 6
2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
3-Pin SOT-23B
3
1
2
3
4
1
2
2
1
represents part number code +
temperature range and voltage
&
Reset V
TC1272
Code
TC1273
Code
TC1274
Code
CC
Threshold (V)
4.62
4.37
4.12
X1
X2
X3
Y1
Y2
Y3
Z1
Z2
Z3
3
4
represents year and quarter code
represents lot ID number
2003 Microchip Technology Inc.
DS21382B-page 7
TC1272/TC1273/TC1274
3-Lead Plastic Small Outline Transistor (TT) (SOT23)
E
E1
2
B
p1
D
n
p
1
α
c
A
A2
A1
φ
β
L
Units
INCHES*
NOM
MILLIMETERS
Dimension Limits
MIN
MAX
MIN
NOM
3
MAX
n
p
p1
A
A2
A1
E
E1
D
L
φ
Number of Pins
Pitch
3
.038
.076
.040
.037
.002
.093
.051
.115
.018
5
0.96
1.92
Outside lead pitch (basic)
Overall Height
Molded Package Thickness
.035
.044
0.89
0.88
1.01
0.95
0.06
2.37
1.30
2.92
0.45
5
1.12
1.02
0.10
2.64
1.40
3.04
0.55
10
.035
.000
.083
.047
.110
.014
0
.040
.004
.104
.055
.120
.022
10
Standoff
§
0.01
2.10
1.20
2.80
0.35
0
Overall Width
Molded Package Width
Overall Length
Foot Length
Foot Angle
Lead Thickness
Lead Width
c
.004
.015
0
.006
.017
5
.007
.020
10
0.09
0.37
0
0.14
0.44
5
0.18
0.51
10
B
α
β
Mold Draft Angle Top
Mold Draft Angle Bottom
0
5
10
0
5
10
* Controlling Parameter
§ Significant Characteristic
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: TO-236
Drawing No. C04-104
DS21382B-page 8
2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
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
a)
b)
c)
TC1272-10ENBTR: 4.37V Reset
TC1272-15ENBTR: 4.12V Reset
TC1272-5ENBTR: 4.62V Reset
Threshold
Range
Device:
TC1272: 3-Pin Reset Monitor - Complementary
TC1273: 3-Pin Reset Monitor - Open Drain
TC1274: 3-Pin Reset Monitor - Complementary
a)
b)
c)
TC1273-10ENBTR: 4.37V Reset
TC1273-15ENBTR: 4.12V Reset
TC1273-5ENBTR:
4.62V Reset
Reset VCC
5
=
=
=
4.62V
4.37V
4.12V
Threshold Voltage
10
15
a)
b)
c)
TC1274-10ENBTR: 4.37V Reset
TC1274-15ENBTR: 4.12V Reset
Temperature Range:
Package:
E
=
=
-40°C to +85°C
TC1274-5ENBTR:
4.62V Reset
NB
Plastic Small Outline Transistor (SOT-23), 3-lead
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2003 Microchip Technology Inc.
DS21382B-page9
TC1272/TC1273/TC1274
NOTES:
DS21382B-page 10
2003 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 intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications. No
representation or warranty is given and no liability is assumed
by Microchip Technology Incorporated with respect to the
accuracy or use of such information, or infringement of patents
or other intellectual property rights arising from such use or
otherwise. Use of Microchip’s products as critical components in
life support systems is not authorized except with express
written approval by Microchip. No licenses are conveyed,
implicitly or otherwise, under any intellectual property rights.
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The Microchip name and logo, the Microchip logo, KEELOQ,
MPLAB, PIC, PICmicro, PICSTART, PRO MATE and
PowerSmart are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL
and The Embedded Control Solutions Company are registered
trademarks of Microchip Technology Incorporated in the U.S.A.
Accuron, Application Maestro, dsPIC, dsPICDEM,
dsPICDEM.net, ECONOMONITOR, FanSense, FlexROM,
fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC,
microPort, Migratable Memory, MPASM, MPLIB, MPLINK,
MPSIM, PICC, PICkit, PICDEM, PICDEM.net, PowerCal,
PowerInfo, PowerMate, PowerTool, rfLAB, rfPIC, Select Mode,
SmartSensor, SmartShunt, SmartTel and Total Endurance are
trademarks of Microchip Technology Incorporated in the U.S.A.
and other countries.
Serialized Quick Turn Programming (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.
© 2003, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
®
PICmicro 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
2003 Microchip Technology Inc.
DS21382B - page 11
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Tel: 86-532-5027355 Fax: 86-532-5027205
India
Tel: 39-0331-742611 Fax: 39-0331-466781
Microchip Technology Inc.
India Liaison Office
United Kingdom
Marketing Support Division
Divyasree Chambers
Microchip Ltd.
505 Eskdale Road
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
03/25/03
DS21382B-page 12
2003 Microchip Technology Inc.
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