Datasheet TC1271RERC, TC1271MERC, TC1271LERC, TC1271FERC, TC1270TERC Datasheet (Microchip Technology)

TC1270/TC1271

4-Pin µP Reset Monitors

Features

• PrecisionVCCMonitor for 1.8V, 2.7V, 3.0V, 3. 3V
and 5.0V Nominal Supplies

• Manual Reset Input

• 140msec Mi nimum RESET

, RESET Output

Duration

• RESET

OutputValidtoVCC= 1. 0V (TC1270)

•Low7µA Supply Current

TransientImmunity

•V

CC

• Small 4-Pin SOT-143 Package

• No External Components

• ReplacementforMAX811/812 and Offers a Lower
Threshold Voltage Option

Applications

• Computers

• Embedded Systems

• Battery Powered Equipment

• Critical µP Power Supply Monitoring

Device Selection Table

Part Number Package Temp. Range

TC1270xERC 4-Pin SOT-143 -40°C to +85°C
TC1271xERC 4-Pin SOT-143 -40°C to +85°C

NOTE: “x” denotes a suffix for VCC threshold (see table

below)

Suffix* Reset V

L4.63

M4.38

T3.08
S2.93

R2.63

F1.75

*Custom thresholds available, contact factory.

Threshold (V)

CC

Package Type

4-Pin SOT-143

V

4

GND

1

CC

TC1270
TC1271

TC1270 RESET

TC1271 (RESET)

2

MR

3

General Description

The TC1270 and TC1271 are cost-effective system
supervisor circuits designed to monitor V

CC

in digital
systems and provide a reset signal to the host
processor when necessary. A manual reset input is
provided to override the reset monitor, and is suitable
for use as a push-button reset. No external
components are required.

The reset output is driven active within 20µsec (4µsec
for F version) of V

falling through the reset voltage

CC

threshold. RESET is maintained active for a minimum
of 140msec after V

rises above the reset threshold.

CC

The TC1271 has an active-high RESET output while
the TC1270 has an active-low RESET
output of the TC1270 is valid down to V

output. The

=1V.Both

CC

devices are available in a 4-Pin SOT-143 package.
The TC1270/TC1271 devices are optimized to reject

fast transient glitches on the V
current of 7µA(V

= 3.3V) makes these devices

CC

line. Low supply

CC

suitable for battery powered applications.

Typical Operating Circuit

V

CC

V

CC

Processor

RESET
Input
(Active Low)

Push-

Button

V

CC

MR

RESET

TC1270

GND GND



2002 Microchip TechnologyInc. DS21381B-page 1

TC1270/TC1271

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 (VCCto GND) .............................+6.0V

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

RESET
Input Current, V
Output Current, RESET

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

CC

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

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

Operating Temperature Range.............-40°C to +85°C

StorageTemperature Range..............-65°C to +150°C

TC1270/TC1271 ELE C TRICAL SPECIFICATIONS

Electrical Characteristics: VCC= 5V for L/M versions, VCC= 3.3V for T/S versions, VCC= 3V for R version,VCC=2.0VforF

version. T

Symbol Parameter Min Typ Max Units Test Conditions

V

CC

I

CC

V

TH

t

RP

t

MR

t

MD

V

IH

V

IL

V

IH

V

IL

Note 1: Production testing done at TA= +25°C, over temperature limits ensured by design.

= -40°C to +85°C unless otherwise noted. Typical values are at TA=+25°C.(Note1).

A

VCCRange 1.2 — 5.5 V
Supply Current —

—
—

Reset Threshold 4.54

4.50

4.30

4.25

3.03

3.00

2.88

2.85

2.58

2.55

1.71

1.70

7

10

6

4.63
—

4.38
—

3.08
—

2.93
—

2.63
—

1.75
—

15
15
12

4.72

4.75

4.46

4.50

3.14

3.15

2.98

3.00

2.68

2.70

1.79

1.80

µAV

V TC127_L; T

Reset Threshold Tempco — 30 — ppm/°C

to Reset Delay —

V

CC

—

20

5

—

—

µsec VCC=VTHto VTH– 125mV; L/M/R/S/T/F

Reset Active Timeout Period 140 280 560 msec VCC=V
MR Minimum Pulse Width 10 — — µsec

Glitch Immunity — 0.1 — µsec

MR
MR to Reset Propagation Delay — 0.5 — µsec
MR Input Threshold 2.3

—

0.7 V
—

Pull-upResistance 10 20 40 kΩ

MR

2: RESET

output for TC1270, RESET output for TC1271.

CC

—
—

—

0.8

—
——0.15 V

VVCC>V

VVCC>V

CC

CC>VTH

V

CC<VTH

V

CC<VTH

T

A

TC127_M; T
T

A

TC127_T; T
T

A

TC127_S; T
T

A

TC127_R; T
T

A

TC127_F; T
T

A

, for L/M/R/S/T/F
, for L/M/R/S/T
,forF

= -40°C to +85°C

A

= -40°C to +85°C

= -40°C to +85°C

A

A

A

= -40°C to +85°C

= -40°C to +85°C

= -40°C to +85°C

A

A

TH(MAX)

TH(MAX)

TC127_L/M

TH(MAX)

TC127_R/S/T/F

=+25°C

=+25°C

=+25°C

=+25°C

=+25°C

=+25°C

,

,

DS21381B-page 2



2002 Microchip TechnologyInc.

TC1270/TC1271

TC1270/TC1271 ELE C TRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: VCC= 5V for L/M versions, VCC=3.3VforT/Sversions,VCC= 3V for R version, VCC=2.0VforF

version.T

Symbol Parameter Min Typ Max Units Test Conditions

V

OH

V

OL

V

OL

V

OH

= -40°C to +85°C unless otherwisenoted. Typical values are at TA= +25°C. (Note 1).

A

RESET Output Voltage High
(TC1271)

RESET Output Voltage Low
(TC1271) —

0.8 V

—— VI

CC

—

0.2

V

V TC1271F only,

I
V

TC1271R/S/T only,
—
—

—
—

0.3

0.4

I

TC1271L/M only, I

V

RESET Output Voltage Low
(TC1270)

—

—

0.3

V TC1270R/S/T only,

I

TC1270F only:

I

TC1270L/M only,

I

I

V TC1270L/M only,

I

RESET Output Voltage High
(TC1270)

—
—

VCC–1.5

—
—

—

0.4

TBD

—

V

=150µA;

SOURCE

≤ V

CC

TH(MIN)

=500µA,

SINK

CC=VTH(MAX)

=1.2mA,VCC=V

SINK

CC=VTH(MAX)

=1.2mA,VCC=V

SINK

=500µA, VCC=V

SINK

=3.2mA,VCC=V

SINK

=50µA, VCC>1.0V

SINK

=800µA,

SOURCE

CC=VTH(MAX)

SINK

TH(MAX)

=3.2mA,

TH(MIN)

TH(MIN)

TH(MIN)

0.8 V

Note 1: Production testing done at TA= +25°C, over temperature limits ensured by design.

2: RESET

output for TC1270, RESET output for TC1271.

CC

—

—

TC1270R/S/T/Fonly,

I

V

=500µA,

SOURCE

CC=VTH(MAX)



2002 Microchip TechnologyInc. DS21381B-page 3

TC1270/TC1271

2.0 PIN DESCRIPTIONS

ThedescriptionsofthepinsarelistedinTable2-1.

TABLE 2-1: PIN FUNCTION TABLE

Pin No.

(SOT-143-4)

1 GND Ground.
2 RESET

2 RESET

3MR
4V

Symbol Description

(TC1270)

(TC1271)

CC

outputremains low while VCCis below the reset voltage threshold,andfor at least

RESET
140msec min. after V

RESET output remains high while V
140msec min. after V

Manual reset input generates a reset when MR is belowVIL.
Supply voltage.

risesabove reset threshold.

CC

is below the reset voltage threshold,andfor at least

risesabove reset threshold.

CC

CC

DS21381B-page 4



2002 Microchip TechnologyInc.

TC1270/TC1271

,

V

V

CC

)

00

0

60

320

80

0

1

0

0

000

(

C

n

O

e

J

/S/T

3.0 APPLICATIONS INFORMATION

3.1 VCCTransient Rejection

The TC1270/TC1271 provides accurate VCCmonitor­ingand resettimingduringpower-up,power-down, and
brownout/sag conditions, and rejects negative-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 l ays under the curve will not generate a reset
signal. Combinations above the curve are detected as
a brownout or power-down. Transientimmunity can be
improvedbyaddingacapacitor in close proximitytothe
V

pin of the TC1270/TC1271.

CC

FIGURE 3-1: MAXIMUM TRANSIENT

DURATION VS.
OVERDRIVE FOR GLITCH
REJECTION AT 25°C

V

CC

V

TH

verdriv

beconnectedfromRESET

togroundtodischargestray
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 (100kΩ will be suitable for most
applications). Similarly, a pull-up r esistor t o V

CC

required for the TC1271 to ensure a valid high RESET
for VCCbelow 1.1V.

FIGURE 3-2: ENSURING RESET VALID

TO V

V

CC

V

CC

CC

=0V

TC1270

RESET

R1

GND

100k

3.3 Processors With Bidirectional

I/O Pins

is

Some µP' s (such as Motorola 68HC11) have bi-

Duratio

4

directional reset pins. Depending on the current drive
capability of the processor pin, an indeterminate logic
level may result if there is a logic conflict. This can be
avoided by adding a 4.7 kΩ resistor in series with the
output of the TC1270/TC1271 (Figure 3-3). If there are
other components in the system which require a reset

24

signal, they should be buffered so as not to load the
reset line. If the other components are required to

1

TC127LM

follow the reset I/O of the µP, the buffer should be
connected as shown with the solid line.

FIGURE 3-3: INTERFACING TO

AXIMUM TRANSIENT DURATION

3.2 RESET Signal Integrity During

The TC1270 RESET output is valid to VCC=1.0V.
Below this voltage the output becomes an "open
circuit" and does not sink current. This means CMOS
logic inputs to the µPwillbefloatingatan

TC127xR

1

RESET COMPARATOR OVERDRIVE

10

-

(mV

Power-Down

1

V

CC

V

CC

TC1270

RESET

GND

undetermined voltage. Most digital systems are
completely shut down well above this voltage.
However, in situations where RESET
maintained valid to V

= 0V,a pull-down resistor must

CC

must b e

BIDIRECTIONAL
RESET I/O

Buffer

V

CC

4.7k

µP

RESET

GND

Buffered RESET
To Other System
Components



2002 Microchip TechnologyInc. DS21381B-page 5

TC1270/TC1271

CC

)

8

0

6

0

0

020

0406085

(

e

(

)

CC

= 5V

CC

= 3V

)

30

0

50

0

0

0

0

0

0

040

60

85

e

(

)

OD

V

OD

V

OD

V

)

0

5

50

35

30

5

0

0

0

040

60

85

e

/M

/S/T/F

8

6

0

)

0

020

0406085

e

(

)

V

CC

5V

CC

3V

V

CC

1V

/M

R/S/T

)

30

0

50

010

0

0

0

0

040

60

85

e

(

)

V

O

= 20

OD

V

OD

V

OD

V

V

OD

V

OD

V

0

0

0030

0000

0.9990

0.9980

0.9970

0.9960

0.9950

0.9940

)

0

0

35

5

65

60

e

4.0 TYPICAL CHARACTERISTICS

Note: The graphs and tables provided following this note are a statisticalsummary based on a limited number of

samplesandareprovidedforinformational purposesonly. The performance characteristics listed hereinare
not tested or guaranteed. In some graphs or tables, the datapresented may be outside the specified
operating range ( e.g., outside specified power supply range) and therefore outside the warranted range.

Supply Current vs.Temperatur

No Load, TC127xR/S/T/F

A

1

UPPLY CURRENT

-4

-2

TEMPERATURE (C

Power-Down Reset Delay vs. Temperatur

TC127xF

4

2

1

POWER-DOWN RESET DELAY (µsec)

= 200 m

-4

-2

2

TEMPERATURE (C

=

= 20m

= 100m

Supply Current vs.Temperatur

No Load, TC127xL/M

=

=

SUPPLY CURRENT (µA)

-4

-2

TEMPERATURE (C

Power-Down Reset Delay vs. Temperatur

TC127xL/M/R/S/T

POWER-DOWN RESET DELAY (µsec)

L

4

2

-4

= 200m

-2

= 100m

= 100m

2

TEMPERATURE (C

=

= 200m

= 20m

Power-Up Reset Timeout vs. Temperatur

2

24

24

2

2

POWER-UP RESET TIMEOUT (msec)

22

-4

-2

TEMPERATURE (C

2

TC127xL

TC127xR

DS21381B-page 6

Normalized Reset Threshold vs. Temperatur

1.

1.002

1.001

1.

NORMALIZED THRESHOLD (V)

-4

-1

1

TEMPERATURE (C



2002 Microchip TechnologyInc.

TC1270/TC1271

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

)

8

3

5.0 PACKAGING INFORMATION

5.1 Package Marking Information

1

2

& = part number code + temperature range

(two-digit code)

Part Number (V) Code

TC1270LERC 4.63 S1
TC1270MERC 4.38 S2
TC1270TERC 3.08 S3
TC1270SERC 2.93 S4
TC1270RERC 2.63 S5
TC1270FERC 1.75 S7

5.2 Package Dimensions

4-Pin SOT-14

.079 (2.00
.071 (1.80

PartNumber (V) Code

TC1271LERC 4.63 T1
TC1271MERC 4.38 T2
TC1271TERC 3.08 T3
TC1271SERC 2.93 T4
TC1271RERC 2.63 T5
TC1271FERC 1.75 T7

3

represents year and quarter code

4

represents production lot ID code

.040 (1.02
.031 (0.79

.004 (0.10

.001(0.02

.098 (2.50
.083 (2.10

.080 (2.03
.070 (1.78

.120 (3.05
.105 (2.67

.037 (0.94
.030 (0.77

.021 (0.54
.015 (0.38

.055 (1.40
.047 (1.20

.006 (0.15
.004 (0.09

.010 (0.25
.005 (0.13

Dimensions: inches (mm)



2002 Microchip TechnologyInc. DS21381B-page 7

TC1270/TC1271

NOTES:

DS21381B-page 8



2002 Microchip TechnologyInc.

TC1270/TC1271

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Data Sheets

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 2002 Microchip Technology Inc. DS21381B-page9

TC1270/TC1271

NOTES:

DS21381B-page10  2002 Microchip Technology Inc.

TC1270/TC1271

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

2002 Microchip TechnologyInc. DS21381B-page 11

8-bit MCUs, KEELOQ®code hopping

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DS21381B-page 12



2002 Microchip Technology Inc.