TC1278 DATA SHEET (03/06/2007) DOWNLOAD

Obsolete Device
TC1278/TC1279
3-Pin Reset Monitors for 5V Systems
Features
General Description
•
•
•
•
•
•
•
•
The TC1278/TC1279 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. The
open-drain output uses an internal pull-up resistor of
approximately 6 kΩ.
Precision VCC Monitor for 5.0V System Supplies
250 ms Minimum RESET Output Duration
Output Valid to VCC = 1.2V
VCC Transient Immunity
Small 3-Pin SOT-23 Package
No External Components
Internal Pull-up Resistor
Available in 3 different voltage detection levels:
- 4.625V (typ.), -5 suffix
- 4.375V (typ.), -10 suffix
- 4.125V (typ.), -15 suffix
Applications
•
•
•
•
Computers
Embedded Systems
Battery Powered Equipment
Critical µP Power Supply Monitoring
Package Type
3-Pin SOT-23
(TC1278) RESET
1
(TC1279) RESET
Typical Operating Circuit
VCC
The reset output is driven active within 5 µs of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 250 ms after VCC
rises above the reset threshold. The TC1278 has an
active-high RESET output, while the TC1279 has an
active-low RESET output, with both devices having an
open-drain output stage. The output is valid down to
VCC = 1.2V. Both devices are available in a 3-Pin
SOT- 23 package.
Internal
Pull-up
6 kΩ
Resistor
–
TC1278
TC1279
RESET
VCC
3
GND
2
+
VREF
TC1279
GND
TC1278 has an active-high RESET output.
© 2007 Microchip Technology Inc.
DS21384D-page 1
TC1278/TC1279
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......................................20 mA
Power Dissipation (TA ≤ 70°C)
3-Pin SOT-23 (derate 4mW/°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 indicated, TA = -40°C to +85°C. Typical values are at TA = +25°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Supply Voltage
VCC
1.2
—
5.5
V
Note 1
Low Level @ RESET (TC1278)
RESET (TC1279)
VOL
—
—
0.4
V
Note 1
Output Current @ 0.4 Volts
IOL
+8
—
—
mA
Note 2
—
0.9
2.0
mA
VCC > VCCTP(MAX), RESET = 1, (Note 3)
—
—
40
µA
VCC > VCCTP(MAX), RESET = 1, Note 4
Operating Current:
TC1278
ICC1
TC1279
Operating Current:
TC1278
ICC2
TC1279
—
—
40
µA
VCC < VCCTP(MIN), RESET = 0, (Note 4)
—
0.9
2.0
mA
VCC < VCCTP(MIN), RESET = 0, (Note 3)
VCC Trip Point (TC1278/9-5)
VCCTP-5
4.50
4.625
4.74
V
Note 1
VCC Trip Point (TC1278/9-10)
VCCTP-10
4.25
4.375
4.49
V
Note 1
VCC Trip Point (TC1278/9-15)
VCCTP-15
4.00
4.125
4.24
V
Note 1
COUT
—
9
—
pF
RP
3
6
9
kΩ
Output Capacitance
Internal Pull-Up Resistor
Note 1:
2:
3:
4:
All voltages referenced to ground.
A 1 kΩ external resistor may be required in some applications for proper operation of the microprocessor
reset control circuit when using the TC1279. VCC = 1.8V.
Operating current is specified with the open-drain output in the active (“ON”) condition.
Operating current is specified with the open-drain output in the non-active (“OFF”) condition.
DS21384D-page 2
© 2007 Microchip Technology Inc.
TC1278/TC1279
AC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, TA = -40°C to +85°C. Typical values are at TA = +25°C.
Parameters
Sym
Min
Typ
Max
Units
RESET Active Time
tRST
250
350
450
ms
VCC Detect to RESET
(TC1279)
tRPD1
—
2
5
µs
Figure 3-2
VCC Detect to RESET
(TC1278)
tRPD2
—
2
5
µs
Figure 3-4
VCC Slew Rate (4.75V-4.00V)
tF
300
—
—
µs
Figure 3-2, Figure 3-4
VCC Slew Rate (4.00V-4.75V)
tR
0
—
—
ns
Figure 3-1, Figure 3-3
VCC Detect to RESET
(TC1279)
tRPU1
250
350
450
ms
Figure 3-1
VCC Detect to RESET
(TC1278)
tRPU2
250
350
450
ms
Figure 3-3
© 2007 Microchip Technology Inc.
Conditions
DS21384D-page 3
TC1278/TC1279
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
2.1
PIN FUNCTION TABLE
Pin No.
Symbol
Function
1
RESET
(TC1279)
RESET output
1
RESET
(TC1278)
RESET output
2
VCC
Supply voltage (1.2V to 5.5V).
3
GND
Ground.
RESET (TC1279)
RESET output remains low while VCC is below the
reset voltage threshold, and for 350 ms (250 ms min.)
after VCC rises above reset threshold. The output stage
of the TC1279 is open-drain.
2.2
2.3
VCC
Supply voltage (1.2V to 5.5V).
2.4
Ground
Device ground.
RESET (TC1278)
RESET output remains high while VCC is below the
reset voltage threshold, and for 350 ms (250 ms min.)
after VCC rises above reset threshold. The output stage
of the TC1278 is open-drain.
DS21384D-page 4
© 2007 Microchip Technology Inc.
TC1278/TC1279
3.0
APPLICATIONS INFORMATION
3.1
Operation – Power Monitor
The TC1278/TC1279 provide the function 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 350 ms after the power supply has
reached the selected tolerance. This allows the power
supply and microprocessor to stabilize before RESET
is released.
4.75V
VCCTP
VCCTP(MIN)
VCC
tRPU2
VOL
FIGURE 3-3:
Diagram.
TC1278 Power-Up Timing
VCC
VOH
FIGURE 3-1:
Diagram.
tF
VCC
tRPU1
RESET
4.74V
VCCTP
TC1279 Power Up Timing
4.75V
VCCTP
VOH
RESET
FIGURE 3-4:
Timing Diagram.
4.00V
4.00V
tRPD2
tF
VCC
VCCTP(MAX)
VCCTP
RESET
tR
4.00V
tR
RESET SLEWS WITH VCC
TC1278 Power-Down
tRPD1
RESET
VOL
FIGURE 3-2:
Timing Diagram.
TC1279 Power-Down
© 2007 Microchip Technology Inc.
DS21384D-page 5
TC1278/TC1279
VCC Transient Rejection
The TC1278/TC1279 provides accurate VCC monitoring and reset timing during power-up, power-down,
and brownout/sag conditions. Furthermore, it 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 TC1278/TC1279.
VCC
VCCTP
Overdrive
MAXIMUM TRANSIENT DURATION (µsec)
3.2
Duration
5
TA = +25°C
4
3
2
TC1278/9
1
0
1
5
1000
100
RESET COMPARATOR OVERDRIVE,
[ VCCTP - VCC] (mV)
FIGURE 3-5:
Maximum Transient
Duration vs. Overdrive For Glitch Rejection At
+25°C.
DS21384D-page 6
© 2007 Microchip Technology Inc.
TC1278/TC1279
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
3-Pin SOT-23
1
1
&
2
2
3
4
= part number code + temperature range
and voltage
Part Number
TC1278-5ENB
Code
PA
TC1278-10ENB
PB
TC1278-15ENB
PC
TC1279-5ENB
RA
TC1279-10ENB
RB
TC1279-15ENB
RC
3
represents year and 2-month code
4
represents production lot ID code
© 2007 Microchip Technology Inc.
DS21384D-page 7
TC1278/TC1279
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
Dimension Limits
Number of Pins
MILLIMETERS
MIN
NOM
MAX
N
3
Lead Pitch
e
0.95 BSC
Outside Lead Pitch
e1
Overall Height
A
0.89
–
Molded Package Thickness
A2
0.79
0.95
1.02
Standoff
A1
0.01
–
0.10
1.90 BSC
1.12
Overall Width
E
2.10
–
2.64
Molded Package Width
E1
1.16
1.30
1.40
Overall Length
D
2.67
2.90
3.05
Foot Length
L
0.13
0.50
0.60
Foot Angle
φ
0°
–
10°
Lead Thickness
c
0.08
–
0.20
Lead Width
b
0.30
–
0.54
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
DS21384D-page 8
© 2007 Microchip Technology Inc.
TC1278/TC1279
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 VCC
Threshold
Temperature
Range
Package
Device
TC1278:
TC1279:
3-Pin Reset Monitor for 5V Systems
3-Pin Reset Monitor for 5V Systems
Reset VCC
Threshold:
5
10
15
= 4.625V
= 4.375V
= 4.125V
Temperature Range
E = -40°C to +85°C
Package
NBTR = Plastic Small Outline Transistor, (SOT23), 3-lead
(Tape and Reel)
© 2007 Microchip Technology Inc.
Examples:
a)
b)
c)
TC1278-5ENBTR: 4.625 Reset
TC1278-10ENBTR: 4.375 Reset
TC1278-15ENBTR: 4.125 Reset
a)
b)
c)
TC1279-5ENBTR: 4.625 Reset
TC1279-10ENBTR: 4.375 Reset
TC1279-15ENBTR: 4.125 Reset
DS21384D-page 9
TC1278/TC1279
NOTES:
DS21384D-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
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OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
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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.
DS21384D-page 11
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12/08/06
DS21384D-page 12
© 2007 Microchip Technology Inc.