TC1272AJVNBTR - Microchip Technology, Inc.

 2004-2012 Microchip Technology Inc. DS21877B-page 1

TC1272A

Features

• Precision VDD Monitor

• 140 msec Minimum RESET, Output Duration

• Output Valid to VDD = 1.2V

•V

DD Transient Immunity

• Small 3-Pin SOT-23B Package

• No External Compo nents

Applications

• Computers

• Embedded Systems

• Battery-Powered Equipment

• Critical µP Power Supply Monit orin g

Typical Application Circuit

General Description

The TC1272A are cost-effective system supervisor

circuits desig ned to mo nito r VDD in digit al s ys tem s an d

provide a reset signal to the host processor, when

necessary. No external components are required.

The reset output is driven active within 65 µsec (typ.)

of VDD falling through the reset voltage threshold.

RESET is maintained active for a minimum of

140 msec after VDD rises above the reset threshold.

The TC1272A has a compliment ary output. The output

of the TC1272A is valid down to VDD = 1.2V. The

device is available in a 3-Pin SOT-23B package.

The TC1272A device is optimized to reject fast

transient glitches on the VDD line.

Package Type

TC1272A

VDD

RESET RESET

Input

Processor

3GNDGND

VDD

RESET

GND

TC1272A

Note: 3-Pin SOT-23B is equivalent to

3-Pin SOT-23B*

JEDEC TO-236.

3-Pin Reset Monitor

TC1272A

DS21877B-page 2  2004-2012 Microchip Technology Inc.

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings†

Supply Voltage (VDD to GND)..........................................6.0V

RESET.... ..............................................–0.3V to (VDD +0.3V)

Input Current, VDD.........................................................20 mA

Output Current, RESET ................................................20 mA

dV/dt (VDD).............................................................100V/µsec

Operating Tem perature Range.....................–40°C to +125°C

Power Dissipation (TA = 70°C):

3-Pin SOT- 23B (derate 4 mW/°C above +70°C) ....320 mW

Storage Temper ature Range........................–65°C to +150°C

Maximum Junction Temperature, TJ..............................150°C

† Notice: Stresses above those listed under “Maximum

ratings” may c ause permanent dam age to the device. This is

a stress rating only and functional operation of the device at

those or any other conditions above those indicated in the

operational listings of this specification is not implied. Expo-

sure to max imum rati ng conditions for extended periods may

affect device reliability.

PIN FUNCTION TABLE

NAME FUNCTION

GND Ground

RESET RESET push-pull output remains

low while VDD is below the reset

voltage threshold and for 140 msec

(min.) after VDD rises above reset

threshold

VDD

ELECTR ICAL CHARACTERISTICS

VDD = Full Range, TA = Operating Temperature Range, unless otherwise noted. Typ ical values are at TA = +25°C,

VDD = 5V for L/M/J, 3.3V for T/S, 3.0V for R and 2.5V for Z (Note 1).

Parameter Sym Min Typ Max Unit s Test Conditions

VDD Range 1.0 — 5.5 V TA = 0°C to +70°C

1.2 — 5.5 TA = – 40°C to +125°C

Supply Current ICC —1230µATC1272AL/M/J: VDD < 5.5V

—925 TC1272AR/S/T/Z: VDD < 3.6V

Reset Threshold (Note 2) VTH 4.56 4.63 4.70 V TC1272AL: TA = +25°C

4.50 — 4.75 TA = – 40°C to +125°C

4.31 4.38 4.45 V TC1272AM: TA = +25°C

4.25 — 4.50 V TA = – 40°C to +125°C

3.93 4.00 4.06 V TC1272AJ: TA = +25°C

3.89 — 4.10 V TA = – 40°C to +125°C

3.04 3.08 3.11 V TC1272AT: TA = +25°C

3.00 — 3.15 V TA = – 40°C to +125°C

2.89 2.93 2.96 V TC1272AS: TA = +25°C

2.85 — 3.00 V TA = – 40°C to +125°C

2.59 2.63 2.66 V TC1272AR: TA = +25°C

2.55 — 2.70 V TA = – 40°C to +125°C

2.28 2.32 2.35 V TC1272AZ: TA = +25°C

2.25 — 2.38 V TA = – 40°C to +125°C

Reset Threshold Tempco — 30 — ppm/°C

VDD to Reset Delay, — 65 — µsec VDD = VTH to (VTH – 100 mV) (Note 2)

Reset Active T ime Out

Period 140 320 560 msec

RESET Output Voltage

Low VOL ——0.3VTC1272AR/S/ T/Z: VDD = VTH min, ISINK = 1. 2 mA

——0.4 TC1272AL/M/J: VDD = VTH min, ISINK = 3. 2 mA

——0.3 V

DD > 1.0V, ISINK = 50 µA

RESET Output Voltage

High VOH 0.8 VDD ——VTC1272AR/S/ T/Z: VDD > VTH max,

ISOURCE = 500 µA

VDD – 1.5 — — TC1272AL/M/J: VDD > VTH max, ISOURCE = 800 µA

Note 1: Production testing done at TA = +25°C, overtemperature limits ensured by QC screen.

2: RESET Output for TC1272A.

 2004-2012 Microchip Technology Inc. DS21877B-page 3

TC1272A

2.0 TYPICAL PERFORMANCE CHARACTERISTICS

FIGURE 2-1: Supply Current vs.

Temperature.

FIGURE 2-2: Supply Current vs.

Temperature.

FIGURE 2-3: Power-up Reset Time Out

vs. Temperatu re.

FIGURE 2-4: Normalized Reset

Threshold vs. Temperature.

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.

-40 -20 0 20 40 60 80 100 120

Temperature (°C)

Supply Current ( µA)

VDD = 1V

VDD = 3V

VDD = 5V

TC1272A/R/S/T/Z, No Load

-40-200 20406080100120

Temperature (°C)

Supply Current ( µA)

VDD = 5V

VDD = 3V

VDD = 1V

TC1272A/L/M/J, No Load

100

150

200

250

300

350

400

450

-40-200 20406080100120

Temp erature (°C)

Power-up Reset Timeout (µsec)

0.997

0.998

0.999

1.001

-40-200 20406080100120

Temperature (°C)

Normalized Reset Threshold

TC1272A

DS21877B-page 4  2004-2012 Microchip Technology Inc.

3.0 APPLICATIONS INFORMATION

3.1 VDD Transient Rejection

The TC1272A provides accurate VDD monitoring and

reset t i ming du r i ng po w e r- up , po w er- d ow n and br own -

out/sag co nditions . These devices also rej ect nega tive-

going transients (glitches) on the power supply line.

Figure 3-1 shows the maximum transient duration vs.

maximum negative excursion (overdrive) for glitch

rejection. Any combination of duration and overdrive

that lies under the curve will not generate a reset

signal.

FIGURE 3-1: Maximum Transient

Duration vs. Overdrive for Glitch Rejection at

+25°C.

Combinations above the curve are detected as a

brown-out or power-down condition. Transient immu-

nity can be improved by adding a capacitor in close

proximity to the VDD pin of the TC1272A.

3.2 RESET Signal Integrity During

Power-Down

The TC1272A RESET output is valid to VDD = 1.0V.

Below this voltage, the output becomes an "open cir-

cuit" and does not sink current. This means CMOS

logic inputs to the microcontroller will be floating at an

undetermined voltage. Most digital systems are com-

pletely shut down well above this voltage. However, in

situations where RESET must be maintained valid to

VDD = 0V, a pu ll-down resi stor must be conne cted from

RESET to ground to discharge stray capacitances and

hold the output low (Figure 3-2). This resistor value,

though not critical, should be chosen such that it does

not appreciably load RESET under normal operation

(100 k will be suitable for most applications).

FIGURE 3-2: The addition of R1 at the

RESET output of the TC1272A ensures that the

RESET output is valid to VDD = 0V.

Reset Comparator Overdrive

[VTH - VDD] (mv)

400

240

160

320

0 1

100

1000

TA = +25°C

VTH

Duration

Overdrive

VDD

TC1272A/L/M/J

Maximum Transient Duration (µsec)

TC1272A/Z/R/S/T

[VTH - VDD] (mv)

100

110

120

130

1 10 100 1000

Reset Compar ator Overdrive (mV)

VDD to Reset Delay ( µsec)

TC1272A/L/M/J

TC1272A/Z/R/S/T

TC1272A

VDD

100 k

RESET

GND

 2004-2012 Microchip Technology Inc. DS21877B-page 5

TC1272A

3.3 Controllers and Processors With

Bidirectional I/O Pins

Some microcontrollers have bidirectional reset pins.

Depending on the current drive capability of the

controller pin, an indeterminate logic level may result if

there is a logic conflict. This can be avoided by adding

a 4.7 k resistor in series with the output of the

TC1272A (Figure 3-3). If there are oth er components in

the system that require a reset signal, they should be

buffered so as not to load the reset line. If the other

components are required to follow the reset I/O of the

microcontroller, the buffer should be connected as

shown with the solid line. FIGURE 3-3: Interfacing the TC1272A to

a Bidirectional RESET I/O.

TC1272A

VDD

RESET

GND

RESET

GND

Buffered RESET

To Other System

Components

4.7 k

Buffer

Micro-

TC1272A

RESET

GND

RESET

GND

Buffered RESET

To Other System

Components

PIC®

4.7 k

Buffer

MCU

TC1272A

DS21877B-page 6  2004-2012 Microchip Technology Inc.

4.0 PACKAGING INFORMATION

4.1 Package Marking Information

Part Number SOT-23

TC1272AZVNBTR BA

TC1272ARVNBTR BB

TC1272ASVNBTR BC

TC1272ATVNBTR BD

TC1272AJVNBTR BE

TC1272AMVNBTR BF

TC1272ALVNBTR BG

Legend: 1 Part Number + temperature range and voltage (two-digit code)

2 Part Number + temperature range and voltage (two-digit code)

3 Lot ID number

4 Year and work week

5 Year and work week

6 Year and work week

Note: In the event the full Microchip part number cannot be marked on one line, it will be

carried over to the next line thus limiting the number of available characters for customer

specific information.

3-Pin SOT-23B



 2004-2012 Microchip Technology Inc. DS21877B-page 7

TC1272A

3-Lead Plastic Small Outline Transistor (NB) (SOT-23)

10501050



Mold Draft Angle Bottom 10501050



Mold Draft Angle Top 0.510.440.37.020.017.015BLead Width 0.180.140.09.007.006.004

Lead Thickness 10501050



Foot A ngle 0.550.450.35.022.018.014LFoot Length 3.042.922.80.120.115.110DOverall Length 1.401.301.20.055.051.047E1Molded Package Width 2.642.372.10.104.093.083EOverall Width 0.100.060.01.004.002.000A1Standoff § 1.020.950.88.040.037.035A2Molded Package Thickness 1.121.010.89.044.040.035AOverall Height 1.92.076

Outside lead pitch (basic) 0.96

.038

Pitch 33

Number of Pins MAXNOMMINMAXNOMMINDimension Limits MILLIMETERSINCHES*Units







* Controlling Parameter

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

§ Significa nt Char acte risti c

Note: For the most cu rr e nt pac ka ge dr aw i ngs, p le ase se e t he Mi c ro c hi p Pa ck ag ing Specifica t i on lo ca t ed

at http://www.microchip.com/packaging

TC1272A

DS21877B-page 8  2004-2012 Microchip Technology Inc.

4.2 Product Tape and Reel Specifications

FIGURE 4-1: EMBOSSED CARRIE R DIMENSIONS (8, 12, 16, AND 24 MM TAPE ONLY)

FIGURE 4-2: 3-LEAD SOT-23 DEVICE TAPE AND REEL SPECIFICATIONS

Top

Cover

Tape

TABLE 1: CARRIER TAPE/CAVITY DIMENSIONS

Case

Outline Package

Type

Carrier

Dimensions Cavity

Dimensions Output

Quantity

Units

Reel

Diameter in

mm P

mm A0

mm B0

mm K0

NB SOT-23 3L 8 4 3.15 2.77 1.22 3000 180

User Direction of Feed

Pitch

Standard Reel Component Orientation Reverse Reel Component Orientation

W, Width

of Carrier

Tape

Pin 1

Device

Marking

Device

Marking

 2004-2012 Microchip Technology Inc. DS21877B-page 9

TC1272A

5.0 REVISION HISTORY

Revision B (January 2013)

Added a note to each package outline drawing.

TC1272A

DS21877B-page 10  2004-2012 Microchip Technology Inc.

NOTES:

 2004-2012 Microchip Technology Inc. DS21877B-page 11

TC1272A

PRODUCT IDENTIFICATION SYSTEM

To order or ob tain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

Sales and Support

Device: TC1272A : Superv is or circuit with active -l ow RESE T output

VDD Reset Threshold: L = 4.63V

M=4.38V

J=4.00V

T=3.08V

S=2.93V

R=2.63V

Z=2.32V

Temperature Range: V = -40°C to +125°C

Package: NBTR = SOT-23B, 3-pin (Tape and Reel)

PART NO. X X

Temperature

VDD

Reset

Device

Examples:

a) TC1272AZVNBTR: Supervisor w/2.32 VDD

option.

b) TC1272ARVNBTR: Supervisor w/2.63 VDD

option.

c) TC1272ASVNBTR: Supervisor w/2.93 VDD

option.

d) TC1272ATVNBTR: Supervisor w/3.08 VDD

option.

e) TC1272AJVNBTR: Supervisor w/4.00 VDD

option.

f) TC1272AMVNBTR: Supervisor w/4.38 VDD

option.

g) TC1272ALVNBTR: Supervisor w/4.63 VDD

option.

Range

Threshold

XXXXX

Package

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. Your local Microc hip sales office

2. Th e Microchip Worldwide Site (www.microchip.com)

Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.

Customer Notification System

TC1272A

DS21877B-page 12  2004-2012 Microchip Technology Inc.

NOTES:

 2004-2012 Microchip Technology Inc. DS21877B-page 13

Information contained in this publication regarding device

applications a nd the lik e is provided only f or yo ur convenience

and may be supers ed ed by u pda t es . It is y our responsibil it y to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

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Trademarks

The Microchip name and logo, the Microchip logo, dsPIC,

FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,

PICSTART, PIC32 logo, rfPIC, SST, SST Logo, SuperFlash

and UNI/O are registered trademarks of Microchip T echnology

Incorporated in the U.S.A. and other countries.

FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,

MTP, SEEVAL and The Embedded Control Solutions

Company are registered trademarks of Microchip Technology

Incorporated in the U.S.A.

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Microchip Technology Inc. in other countries.

Analog-for-the-Digital Age, Application Maestro, BodyCom,

chipKIT, chipKI T logo, CodeGuard, dsPICDEM ,

dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,

ECONOMONIT OR, FanSense, HI-TIDE, In - Circuit Serial

Programm ing, ICSP, Mindi, MiWi, MPAS M, MPF, MPLAB

Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code

Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,

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SQTP is a service mark of Microchip T echnology Incorporated

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GestIC and ULPP are registered trademarks of Microchip

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All other trademarks mentioned herein are property of their

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Printed on recycled paper.

ISBN: 9781620769041

Note the following details of the code protection feature on Microchip devices:

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• Microchip believes that it s family of products is one of t he most secure famili es 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 c onstantly evolving. We a t Microc hip are co m mitted to continuously improving the code prot ect ion featur es of our

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Microchip received ISO/TS-16949:2009 certification for its worldwide

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QUALITY MANAGEMENT S

YSTEM

CERTIFIED BY DNV

== ISO/TS 16949 ==

DS21877B-page 14  2004-2012 Microchip Technology Inc.

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