MICROCHIP TC1272, TC1273, TC1274 Technical data

M

3-Pin Reset Monitors for 5V Systems

TC1272/TC1273/TC1274

Features

• Precision VCC Monitor for 5.0V Systems

• 100 msec Minimum RESET
Duration

• Output Valid to V

Transient Immunity

•V

CC

• Small 3-Pin SOT-23B Package

• No External Components

CC

= 1.2V

, RESET Output

Applications

• Computers

• Embedded Systems

• Battery-Powered Equipment

• Critical µP Power Supply Monitoring

Package Type

3-Pin SOT-23B*

RESET

**(RESET)

* 3-Pin SOT-23B is equivalent to JEDEC TO-236
**( ) is for TC1274

1

TC1272
TC1273
TC1274

V

2

CC

3

GND

General Description

The TC1272/TC1273/TC1274 are cost-effective
system supervisor circuits designed to monitor V
digital systems and provide a reset signal to the host
processor when necessary. No external components
are required.

The reset output is driven active within 20 µsec of V
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

an active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET
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 V
= 1.2V. The TC1274 is valid down to VCC = 1.8V. All
three devices are available in a 3-Pin SOT-23B
package.

The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the V

output. The

line.

CC

CC

in

CC

CC

Typical Operating Circuit

V

CC

2

V

CC

RESET

1

TC1272

GND GND

3

RESET
Input

Processor

V

CC

 2003 Microchip Technology Inc. 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

Absolute Maximum Ratings†

Supply Voltage (VCC to GND) ............................. +6.0V

, RESET.......................... -0.3V to (VCC + 0.3V)

RESET

Input Current, V

Output Current, RESET

Power Dissipation (T

..............................................20 mA

CC

, RESET ........................20 mA

≤ 70°C)

A

operation sections of the specifications is not implied. Expo­sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.

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 V

TC1274 V

Output Voltage @ 0-500 µA V

CC

CC

OH

Output Current @ 2.4 Volts

= 5V TC1272 I

V

CC

= 4V TC1274 I

V

CC

Output Current @ 0.4 Volts I

OH

OH

OL

Operating Current

< 5.5V: TC1272, TC1274 I

V

CC

< VCC < 5.5V: TC1273 I

V

CCTP

< V

V

CC

Trip Point (TC1272/3/4-5) V

V

CC

Trip Point (TC1272/3/4-10) V

V

CC

Trip Point (TC1272/3/4-15) V

V

CC

: TC1273 I

CCTP

Output Capacitance C

Internal Pull-Up Resistor R

AC Electrical Characteristics: T

RESET Active Time t

Detect to RESET

V

CC

TC1272, TC1273

Detect to RESET - TC1274 t

V

CC

Slew Rate

V

CC

(V

(MAX) to V

CCTP

Slew Rate

V

CC

(V

(MIN) to V

CCTP

Detect to RESET

V

CC

TC1272, TC1273

Detect to RESET - TC1274 t

V

CC

CCTP

CCTP

(MIN))

(MAX))

CC

CC

CC

CCTP-5

CCTP-10

CCTP-15

OUT

P

= -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.

A

RST

t

RPD1

RPD2

t

F

t

R

t

RPU1

RPU2

Note 1: All voltages referenced to ground.

2: Measured with V
3: Measured with RESET
4: t

= 5 µsec.

R

5: A 1 kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control

≥ 2.7 volts.

CC

output open for TC1272/TC1273; measured with RESET output open for TC1274.

circuit when using the TC1273.

1.2 — 5.5 V Note 1

1.8 — 5.5 V

VCC – 0.5V VCC – 0.1V — V TC1272, TC1274 (Note 1)

—10—mANote 2

—8—mA

+10 30 — mA Note 2, Note 5

—1740µANote 3

—1740µANote 3

— 700 1200 µA Note 3

4.50 4.62 4.75 V Note 1

4.25 4.37 4.49 V Note 1

4.00 4.12 4.24 V Note 1

—9—pF

369kΩ

100 200 300 msec

—2050µsecV

—2050µsecV

CC(LOW)

CC(LOW)

= 1V, Figure 4-2

= 1V, Figure 4-4

300 — — µsec Figure 4-2, Figure 4-4

0 — — nsec Figure 4-1, Figure 4-3

100 200 300 msec Note 4, Figure 4-1

100 200 300 msec Note 4, Figure 4-3

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

Comparator Overdrive voltage (V

TA = 25°C

sec)

100000

µ

10000

1000

TO RESET DELAY (

100

CC

V

10

1

FIGURE 2-1: V
(RESET

).

VOD = 20mV

VOD = 100mV

VOD = 200mV

10

100

V

SLEW RATE (V/µsec)

CC

Detect to Reset

CC

VOD = 1V

1000

= -40°C to +85°C. Typical values are at TA = +25°C.

A

) is defined in Figure 4-5

OD

300

sec)

µ

200

VOD = 2V

10000

100000

100

TO RESET DELAY (

CC

V

0

0

COMPARATOR OVERDRIVE (V)

FIGURE 2-2: Reset Delays vs. Comparator Overdrive.

TA = 25°C

12 3

4

5

 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 FUNCTION TABLES

Pin No. Symbol Function

1 RESET

1 RESET RESET Output (TC1274)

2V

3 GND Ground

CC

RESET Output (TC1272 and TC1273)

Supply voltage (1.2V to 5.5V TC1272 and TC1273; 1.8V to 5.5V TC1274)

3.1 RESET Output (RESET)

The RESET output remains low while VCC is below the
reset voltage threshold, and for 200 msec (100 msec
min.) after V
stage of the TC1272 is complimentary, while the output
stage of the TC1273 is open-drain.

rises above reset threshold. The output

CC

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 V
stage of the TC1274 is complimentary.

rises above reset threshold. The output

CC

DS21382B-page 4  2003 Microchip Technology Inc.

4.0 APPLICATIONS INFORMATION

4.1 Operation – Power Monitor

TC1272/TC1273/TC1274

t

R

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 V

CC

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.

t

R

V

(MAX)

CCTP

V

CCTP

t

RPU1

V

OH

V

CC

RESET

V

CCTP

(MIN)

FIGURE 4-1: Timing Diagram – Power Up (TC1272/TC1273).

V

(MAX)

CCTP

V

CCTP

t

RPU2

V

OL

V

CC

RESET

V

CCTP

(MIN)

FIGURE 4-3: Timing Diagram – Power Up (TC1274).

t

F

V

CC

V

(MAX)

CCTP

V

CCTP

V

CCTP

(MIN)

t

RPD2

t

V

CCTP

V

F

(MIN)

OL

t

RPD1

V

CC

RESET

V

CCTP

(MAX)

V

CCTP

FIGURE 4-2: Timing Diagram – Power Down (TC1272/TC1273).

V

OH

RESET

RESET Slews With V

FIGURE 4-4: Timing Diagram – Power Down (TC1274).

CC

 2003 Microchip Technology Inc. DS21382B-page 5

TC1272/TC1273/TC1274

4.2 V

The TC1272/TC1273/TC1274 provides accurate V

Transient Rejection

CC

CC

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 V

pin of the

CC

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
V

= 0V, a pull-down resistor must be connected from

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
(100 kΩ will be suitable for most applications). Simi­larly, a pull-up resistor to V
TC1274 to ensure a valid high RESET

1.8V.

must be maintained valid to

under normal operation

is required for the

CC

for VCC below

V

CC

V

TH

Overdrive

Duration

500

400

300

200

100

0

MAXIMUM TRANSIENT DURATION (µsec)

1

RESET COMPARATOR OVERDRIVE,

TA = +25°C

10

[V

CCTP-VCC

TC1272/3/4

100

] (mV)

1000

FIGURE 4-5: Maximum Transient Duration vs. Overdrive For Glitch Rejection At +25°C.

V

CC

V

CC

TC1272

RESET

R

1

GND

FIGURE 4-6: Ensuring Reset
V

=0V.

cc

DS21382B-page 6  2003 Microchip Technology Inc.

100 kΩ

Valid To

5.0 PACKAGING INFORMATION

5.1 Package Marking Information

3-Pin SOT-23B

3

1 2 3 4

12

2

represents part number code +

1

&

temperature range and voltage

TC1272/TC1273/TC1274

Reset VCC

Threshold (V)

4.62 X1 Y1 Z1

4.37 X2 Y2 Z2

4.12 X3 Y3 Z3

represents year and quarter code

3

4

represents lot ID number

TC1272

Code

TC1273

Code

TC1274

Code

 2003 Microchip Technology Inc. DS21382B-page 7

TC1272/TC1273/TC1274

3-Lead Plastic Small Outline Transistor (TT) (SOT23)

E

E1

2

B

n

1

c

β

Number of Pins
Pitch
Outside lead pitch (basic)

Molded Package Thickness

Foot Angle
Lead Thickness

Mold Draft Angle Top
Mold Draft Angle Bottom

* Controlling Parameter

§ Significant Characteristic

Notes:

Dimensions D and E1 do not include m old flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: TO-236
Drawing No. C04-104

n
p

p1

A2

φ

c

α
β

p1

D

p

A

φ

L

A1

MILLIMETERSINCHES*Units

0.96.038

1.92.076

α

A2

MAXNOMMINMAXNOMMINDimension Limits

33

1.121.010.89.044.040.035AOverall Height

1.020.950.88.040.037.035

0.100.060.01.004.002.000A1Standoff §

2.642.372.10.104.093.083EOverall Width

1.401.301.20.055.051.047E1Molded Package Width

3.042.922.80.120.115.110DOverall Length

0.550.450.35.022.018.014LFoot Lengt h
10501050

0.180.140.09.007.006.004

0.510.440.37.020.017.015BLead Width
10501050
10501050

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. X /XX

Device

Device: TC1272: 3-Pin Re set Monitor - Complementary

Reset V

CC

Threshold Voltage

Temperature Range: E = -40°C to +85°C

Package: 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 recom­mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:

XX

Reset V

CC

Threshold

TC1273: 3-Pin Reset Monitor - Open Drain
TC1274: 3-Pin Re set Monitor - Complementary

5 = 4.62V
10 = 4.37V
15 = 4.12V

Range

PackageTe mp er at ur e

Examples:

a) TC1272-10ENBTR: 4.37V Reset

b) TC1272-15ENBTR: 4.12V Reset

c) TC1272-5ENBTR: 4.62V Reset

a) TC1273-10ENBTR: 4.37V Reset

b) TC1273-15ENBTR: 4.12V Reset

c) TC1273-5ENBTR: 4.62V Reset

a) TC1274-10ENBTR: 4.37V Reset

b) TC1274-15ENBTR: 4.12V Reset

c) TC1274-5ENBTR: 4.62V Reset

1. Your local Microchip sales office

2. The Microchip Corporate Literature Center U.S. FAX: [phone]

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 Micr ochip 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
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Accuron, Application Maestro, dsPIC, dsPICDEM,
dsPICDE M.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.
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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 pape r.

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
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog produ cts. In
addition, Microchip’s qua lity system for the
design and manufacture of development
systems is ISO 9001 certified.

®

8-bit MCUs, KEEL

®

code hopping

OQ

 2003 Microchip Technology Inc. DS21382B - page 11

M

W

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DS21382B-page 12  2003 Microchip Technology Inc.