MICROCHIP TC1273

M
TC1272/TC1273/TC1274
3-Pin Reset Monitors for 5V Systems
Features
General Description
• Precision VCC Monitor for 5.0V Systems
• 100 msec Minimum RESET, RESET Output
Duration
• Output Valid to VCC = 1.2V
• VCC Transient Immunity
• Small 3-Pin SOT-23B Package
• No External Components
The TC1272/TC1273/TC1274 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.
Applications
•
•
•
•
Computers
Embedded Systems
Battery-Powered Equipment
Critical µP Power Supply Monitoring
Package Type
3-Pin SOT-23B*
RESET
**(RESET)
The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the VCC line.
Typical Operating Circuit
1
TC1272
TC1273
TC1274
VCC
The reset output is driven active within 20 µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 msec after
VCC rises above the reset threshold. The TC1274 has
an active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET output. The
TC1272 and TC1274 each have a complimentary output, while the TC1273 has an open-drain output. The
output of the TC1272 and TC1273 is valid down to VCC
= 1.2V. The TC1274 is valid down to VCC = 1.8V. All
three devices are available in a 3-Pin SOT-23B
package.
VCC
3
GND
2
* 3-Pin SOT-23B is equivalent to JEDEC TO-236
**( ) is for TC1274
 2003 Microchip Technology Inc.
2
VCC
RESET
VCC
1
RESET
Input
TC1272
Processor
GND
GND
3
DS21382B-page 1
TC1272/TC1273/TC1274
1.0
ELECTRICAL
CHARACTERISTICS
† 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.
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-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
TC1272, TC1273
V CC
1.2
—
5.5
V
TC1274
V CC
1.8
—
5.5
V
—
V
Conditions
Supply Voltage
Output Voltage @ 0-500 µA
VOH
VCC – 0.5V VCC – 0.1V
Note 1
TC1272, TC1274 (Note 1)
Output Current @ 2.4 Volts
VCC = 5V TC1272
IOH
—
10
—
mA
VCC = 4V TC1274
IOH
—
8
—
mA
IOL
+10
30
—
mA
Note 2, Note 5
VCC < 5.5V: TC1272, TC1274
ICC
—
17
40
µA
Note 3
VCCTP < VCC < 5.5V: TC1273
ICC
—
17
40
µA
Note 3
VCC < VCCTP: TC1273
ICC
—
700
1200
µA
Note 3
V CCTP-5
4.50
4.62
4.75
V
Note 1
VCC Trip Point (TC1272/3/4-10) VCCTP-10
4.25
4.37
4.49
V
Note 1
VCC Trip Point (TC1272/3/4-15) VCCTP-15
4.00
4.12
4.24
V
Note 1
COUT
—
9
—
pF
RP
3
6
9
kΩ
Output Current @ 0.4 Volts
Note 2
Operating Current
V CC Trip Point (TC1272/3/4-5)
Output Capacitance
Internal Pull-Up Resistor
AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
RESET Active Time
tRST
100
200
300
msec
VCC Detect to RESET
TC1272, TC1273
tRPD1
—
20
50
µsec
VCC(LOW) = 1V, Figure 4-2
VCC Detect to RESET - TC1274
tRPD2
—
20
50
µsec
VCC(LOW) = 1V, Figure 4-4
VCC Slew Rate
(VCCTP(MAX) to VCCTP(MIN))
tF
300
—
—
µsec
Figure 4-2, Figure 4-4
VCC Slew Rate
(VCCTP(MIN) to VCCTP(MAX))
tR
0
—
—
nsec
Figure 4-1, Figure 4-3
VCC Detect to RESET
TC1272, TC1273
tRPU1
100
200
300
msec
Note 4, Figure 4-1
VCC Detect to RESET - TC1274
tRPU2
100
200
300
msec
Note 4, Figure 4-3
Note 1:
2:
3:
4:
5:
All voltages referenced to ground.
Measured with VCC ≥ 2.7 volts.
Measured with RESET output open for TC1272/TC1273; measured with RESET output open for TC1274.
tR = 5 µsec.
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.
300
TA = 25°C
100000
VOD = 20mV
VOD = 100mV
10000
VOD = 200mV
VOD = 1V
1000
VOD = 2V
100
10
1
10
TA = 25°C
200
100
0
100
1000
10000
100000
VCC SLEW RATE (V/µsec)
FIGURE 2-1:
(RESET).
VCC TO RESET DELAY (µsec)
VCC TO RESET DELAY (µsec)
Note: Unless otherwise indicated, TA = -40°C to +85°C. Typical values are at TA = +25°C.
Comparator Overdrive voltage (VOD) is defined in Figure 4-5
VCC Detect to Reset
 2003 Microchip Technology Inc.
0
1
2
3
4
5
COMPARATOR OVERDRIVE (V)
FIGURE 2-2:
Reset Delays vs.
Comparator Overdrive.
DS21382B-page 3
TC1272/TC1273/TC1274
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
PIN FUNCTION TABLES
Pin No.
Symbol
Function
1
RESET
RESET Output (TC1272 and TC1273)
1
RESET
RESET Output (TC1274)
2
VCC
Supply voltage (1.2V to 5.5V TC1272 and TC1273; 1.8V to 5.5V TC1274)
3
GND
Ground
RESET Output (RESET)
The RESET output remains low while VCC is below the
reset voltage threshold, and for 200 msec (100 msec
min.) after VCC rises above reset threshold. The output
stage of the TC1272 is complimentary, while the output
stage of the TC1273 is open-drain.
DS21382B-page 4
3.2
RESET Output (RESET)
The RESET output remains high while VCC is below the
reset voltage threshold, and for 200 msec (100 msec
min.) after VCC rises above reset threshold. The output
stage of the TC1274 is complimentary.
 2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
4.0
APPLICATIONS INFORMATION
4.1
Operation – Power Monitor
The TC1272/TC1273/TC1274 is designed to function
as a voltage monitor for +5V systems. These devices
provide a RESET signal to indicate that the VCC has
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.
VCCTP(MAX)
VCCTP
VCCTP(MIN)
VCC
tRPU2
VOL
RESET
tR
VCCTP(MIN)
tR
VCCTP(MAX)
VCCTP
FIGURE 4-3:
(TC1274).
Timing Diagram – Power Up
VCC
tF
tRPU1
VCC
VOH
VCCTP(MAX)
VCCTP
VCCTP(MIN)
RESET
FIGURE 4-1:
Timing Diagram – Power Up
(TC1272/TC1273).
tRPD2
VOH
tF
VCC
RESET
VCCTP(MAX)
VCCTP
VCCTP(MIN)
RESET Slews With VCC
FIGURE 4-4:
Timing Diagram –
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
VCC Transient Rejection
The TC1272/TC1273/TC1274 provides accurate VCC
monitoring and reset timing during power-up, powerdown 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
capacitor in close proximity to the VCC pin of the
TC1272/TC1273/TC1274.
4.3
RESET Signal Integrity During
Power-Down
The TC1272 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 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 be connected from
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). Similarly, a pull-up resistor to V CC is required for the
TC1274 to ensure a valid high RESET for VCC below
1.8V.
VCC
VTH
Overdrive
Duration
MAXIMUM TRANSIENT DURATION (µsec)
4.2
500
TA = +25°C
400
300
200
TC1272/3/4
100
0
1
10
1000
100
RESET COMPARATOR OVERDRIVE,
[VCCTP-V CC] (mV)
FIGURE 4-5:
Maximum Transient
Duration vs. Overdrive For Glitch Rejection At
+25°C.
VCC
VCC
TC1272
RESET
R1
GND
FIGURE 4-6:
Vcc = 0V.
DS21382B-page 6
100 kΩ
Ensuring Reset Valid To
 2003 Microchip Technology Inc.
TC1272/TC1273/TC1274
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
3-Pin SOT-23B
3
1 2
3
1
1
&
2
4
2
represents part number code +
temperature range and voltage
Reset VCC
Threshold (V)
TC1272
Code
TC1273
Code
TC1274
Code
4.62
X1
Y1
Z1
4.37
X2
Y2
Z2
4.12
X3
Y3
Z3
3
represents year and quarter code
4
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
n
D
p
1
α
c
A
A1
φ
β
A2
L
Units
Dimension Limits
n
p
Number of Pins
Pitch
Outside lead pitch (basic)
Overall Height
Molded Package Thickness
Standoff §
Overall Width
Molded Package Width
Overall Length
Foot Length
Foot Angle
Lead Thickness
Lead Width
Mold Draft Angle Top
Mold Draft Angle Bottom
* Controlling Parameter
§ Significant Characteristic
MIN
p1
A
A2
A1
E
E1
D
L
φ
c
B
α
β
.035
.035
.000
.083
.047
.110
.014
0
.004
.015
0
0
INCHES*
NOM
3
.038
.076
.040
.037
.002
.093
.051
.115
.018
5
.006
.017
5
5
MAX
.044
.040
.004
.104
.055
.120
.022
10
.007
.020
10
10
MILLIMETERS
NOM
3
0.96
1.92
0.89
1.01
0.88
0.95
0.01
0.06
2.10
2.37
1.20
1.30
2.80
2.92
0.35
0.45
0
5
0.09
0.14
0.37
0.44
0
5
0
5
MIN
MAX
1.12
1.02
0.10
2.64
1.40
3.04
0.55
10
0.18
0.51
10
10
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.
XX
X
/XX
Device
Reset V CC
Threshold
Temperature
Range
Package
Device:
Reset VCC
Threshold Voltage
TC1272:
TC1273:
TC1274:
5
10
15
3-Pin Reset Monitor - Complementary
3-Pin Reset Monitor - Open Drain
3-Pin Reset Monitor - Complementary
= 4.62V
= 4.37V
= 4.12V
Temperature Range:
E
=
-40°C to +85°C
Package:
NB = Plastic Small Outline Transistor (SOT-23), 3-lead
Examples:
a)
TC1272-10ENBTR: 4.37V Reset
b)
TC1272-15ENBTR: 4.12V Reset
c)
TC1272-5ENBTR:
a)
TC1273-10ENBTR: 4.37V Reset
b)
TC1273-15ENBTR: 4.12V Reset
c)
TC1273-5ENBTR:
a)
TC1274-10ENBTR: 4.37V Reset
b)
TC1274-15ENBTR: 4.12V Reset
c)
TC1274-5ENBTR:
4.62V Reset
4.62V Reset
4.62V Reset
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
2.
3.
Your local Microchip sales office
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
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.
Trademarks
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
M
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03/25/03
DS21382B-page 12
 2003 Microchip Technology Inc.