www.docs.chipfind.ru
2002 Microchip Technology Inc.
DS21381B-page 1
TC1270/TC1271
Features
Precision V
CC
Monitor for 1.8V, 2.7V, 3.0V, 3.3V
and 5.0V Nominal Supplies
Manual Reset Input
140msec Minimum RESET, RESET Output
Duration
RESET Output Valid to V
CC
= 1.0V (TC1270)
Low 7
A Supply Current
V
CC
Transient Immunity
Small 4-Pin SOT-143 Package
No External Components
Replacement for MAX811/812 and Offers a Lower
Threshold Voltage Option
Applications
Computers
Embedded Systems
Battery Powered Equipment
Critical
P Power Supply Monitoring
Device Selection Table
NOTE: "x" denotes a suffix for VCC threshold (see table
below)
Package Type
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 20
sec (4
sec
for F version) of V
CC
falling through the reset voltage
threshold. RESET is maintained active for a minimum
of 140msec after V
CC
rises above the reset threshold.
The TC1271 has an active-high RESET output while
the TC1270 has an active-low RESET output. The
output of the TC1270 is valid down to V
CC
= 1V. Both
devices are available in a 4-Pin SOT-143 package.
The TC1270/TC1271 devices are optimized to reject
fast transient glitches on the V
CC
line. Low supply
current of 7
A (V
CC
= 3.3V) makes these devices
suitable for battery powered applications.
Typical Operating Circuit
Part Number
Package
Temp. Range
TC1270xERC
4-Pin SOT-143
-40C to +85C
TC1271xERC
4-Pin SOT-143
-40C to +85C
Suffix*
Reset V
CC
Threshold (V)
L
4.63
M
4.38
T
3.08
S
2.93
R
2.63
F
1.75
*Custom thresholds available, contact factory.
V
CC
TC1270 RESET
GND
TC1270
TC1271
1
2
TC1271 (RESET)
3
4
MR
4-Pin SOT-143
TC1270
V
CC
V
CC
V
CC
RESET
RESET
Input
(Active Low)
GND
GND
Processor
MR
Push-
Button
4-Pin
P Reset Monitors
TC1270/TC1271
DS21381B-page 2
2002 Microchip Technology Inc.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage (V
CC
to GND) .............................+6.0V
RESET, RESET.......................... -0.3V to (V
CC
+ 0.3V)
Input Current, V
CC
...............................................20mA
Output Current, RESET, RESET .........................20mA
Operating Temperature Range............. -40C to +85C
Storage Temperature Range .............. -65C to +150C
*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.
TC1270/TC1271 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: V
CC
= 5V for L/M versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, V
CC
= 2.0V for F
version. T
A
= -40C to +85C unless otherwise noted. Typical values are at T
A
= +25C. (Note 1).
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
V
CC
V
CC
Range
1.2
--
5.5
V
I
CC
Supply Current
--
--
--
7
10
6
15
15
12
A
V
CC
> V
TH
, for L/M/R/S/T/F
V
CC
< V
TH
, for L/M/R/S/T
V
CC
< V
TH
, for F
V
TH
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
4.63
--
4.38
--
3.08
--
2.93
--
2.63
--
1.75
--
4.72
4.75
4.46
4.50
3.14
3.15
2.98
3.00
2.68
2.70
1.79
1.80
V
TC127_L; T
A
= +25C
T
A
= -40C to +85C
TC127_M; T
A
= +25C
T
A
= -40C to +85C
TC127_T; T
A
= +25C
T
A
= -40C to +85C
TC127_S; T
A
= +25C
T
A
= -40C to +85C
TC127_R; T
A
= +25C
T
A
= -40C to +85C
TC127_F; T
A
= +25C
T
A
= -40C to +85C
Reset Threshold Tempco
--
30
--
ppm/C
V
CC
to Reset Delay
--
--
20
5
--
--
sec
V
CC
= V
TH
to V
TH
125mV; L/M/R/S/T/F
t
RP
Reset Active Timeout Period
140
280
560
msec
V
CC
= V
TH(MAX)
t
MR
MR Minimum Pulse Width
10
--
--
sec
MR Glitch Immunity
--
0.1
--
sec
t
MD
MR to Reset Propagation Delay
--
0.5
--
sec
V
IH
V
IL
MR Input Threshold
2.3
--
--
--
--
0.8
V
V
CC
> V
TH(MAX)
,
TC127_L/M
V
IH
V
IL
0.7 V
CC
--
--
--
--
0.15 V
CC
V
V
CC
> V
TH(MAX)
,
TC127_R/S/T/F
MR Pull-up Resistance
10
20
40
k
Note
1:
Production testing done at T
A
= +25C, over temperature limits ensured by design.
2:
RESET output for TC1270, RESET output for TC1271.
2002 Microchip Technology Inc.
DS21381B-page 3
TC1270/TC1271
TC1270/TC1271 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: V
CC
= 5V for L/M versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, V
CC
= 2.0V for F
version. T
A
= -40C to +85C unless otherwise noted. Typical values are at T
A
= +25C. (Note 1).
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
V
OH
RESET Output Voltage High
(TC1271)
0.8 V
CC
--
--
V
I
SOURCE
= 150
A;
V
CC
V
TH(MIN)
V
OL
RESET Output Voltage Low
(TC1271)
--
--
--
--
--
--
0.2
0.3
0.4
V
TC1271F only,
I
SINK
= 500
A,
V
CC
= V
TH(MAX)
TC1271R/S/T only,
I
SINK
= 1.2mA, V
CC
= V
TH(MAX)
TC1271L/M only, I
SINK
= 3.2mA,
V
CC
= V
TH(MAX)
V
OL
RESET Output Voltage Low
(TC1270)
--
--
--
--
--
--
0.3
0.4
TBD
V
TC1270R/S/T only,
I
SINK
= 1.2mA, V
CC
= V
TH(MIN)
TC1270F only:
I
SINK
= 500
A, V
CC
= V
TH(MIN)
TC1270L/M only,
I
SINK
= 3.2mA, V
CC
= V
TH(MIN)
I
SINK
= 50
A, V
CC
> 1.0V
V
OH
RESET Output Voltage High
(TC1270)
V
CC
1.5
0.8 V
CC
--
--
--
--
V
TC1270L/M only,
I
SOURCE
= 800
A,
V
CC
= V
TH(MAX)
TC1270R/S/T/F only,
I
SOURCE
= 500
A,
V
CC
= V
TH(MAX)
Note
1:
Production testing done at T
A
= +25C, over temperature limits ensured by design.
2:
RESET output for TC1270, RESET output for TC1271.
TC1270/TC1271
DS21381B-page 4
2002 Microchip Technology Inc.
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(SOT-143-4)
Symbol
Description
1
GND
Ground.
2
RESET
(TC1270)
RESET output remains low while V
CC
is below the reset voltage threshold, and for at least
140msec min. after V
CC
rises above reset threshold.
2
RESET
(TC1271)
RESET output remains high while V
CC
is below the reset voltage threshold, and for at least
140msec min. after V
CC
rises above reset threshold.
3
MR
Manual reset input generates a reset when MR is below V
IL
.
4
V
CC
Supply voltage
.
2002 Microchip Technology Inc.
DS21381B-page 5
TC1270/TC1271
3.0
APPLICATIONS INFORMATION
3.1
V
CC
Transient Rejection
The TC1270/TC1271 provides accurate V
CC
monitor-
ing and reset timing during power-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 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
V
CC
pin of the TC1270/TC1271.
FIGURE 3-1:
MAXIMUM TRANSIENT
DURATION VS.
OVERDRIVE FOR GLITCH
REJECTION AT 25C
3.2
RESET Signal Integrity During
Power-Down
The TC1270 RESET output is valid to V
CC
= 1.0V.
Below this voltage the output becomes an "open
circuit" and does not sink current. This means CMOS
logic
inputs to
the
P
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 V
CC
= 0V, a pull-down resistor must
be connected 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 (100k
will be suitable for most
applications). Similarly, a pull-up resistor to V
CC
is
required for the TC1271 to ensure a valid high RESET
for V
CC
below 1.1V.
FIGURE 3-2:
ENSURING RESET VALID
TO V
CC
= 0V
3.3
Processors With Bidirectional
I/O Pins
Some
P's (such as Motorola 68HC11) have bi-
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 k
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
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
P, the buffer should be
connected as shown with the solid line.
FIGURE 3-3:
INTERFACING TO
BIDIRECTIONAL
RESET I/O
RESET COMPARATOR OVERDRIVE,
V
TH
- V
CC
(mV)
400
240
160
320
80
0
1
10
100
1000
M
AXIMUM TRANSIENT DURATION
(
sec
)
T
A
C
V
TH
Duration
Overdrive
V
CC
TC127LMJ
TC127xR/S/T
TC1270
V
CC
V
CC
R1
100k
RESET
GND
TC1270
V
CC
RESET
GND
RESET
GND
Buffered RESET
To Other System
Components
Buffer
P
4.7k
V
CC
V
CC
TC1270/TC1271
DS21381B-page 6
2002 Microchip Technology Inc.
4.0
TYPICAL CHARACTERISTICS
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.
V
CC
= 1V
TEMPERATURE (
C)
8
10
12
14
6
4
2
0
-40
0
20
-20
40
60
85
S
UPPLY CURRENT
(
A
)
Supply Current vs.Temperature
(No Load, TC127xR/S/T/F)
V
CC
V
= 5V
V
CC
V
V
= 3V
TEMPERATURE (
C)
30
40
50
20
10
0
-40
0
20
-20
40
60
85
POWER-DOWN RESET DELAY (
sec)
Power-Down Reset Delay vs. Temperature
(TC127xF)
V
OD
OD
= 20mV
V
OD
OD
= 100mV
V
OD
OD
= 200 mV
TEMPERATURE (
C)
240
245
250
235
230
225
-40
0
20
-20
40
60
85
POWER-UP RESET TIMEOUT (msec)
Power-Up Reset Timeout vs. Temperature
TC127xL/M
TC127xR/S/T/F
8
6
4
2
0
TEMPERATURE (
C)
-40
0
20
-20
40
60
85
SUPPLY CURRENT (
A)
Supply Current vs.Temperature
(No Load, TC127xL/M)
V
CC
= 5V
V
CC
= 3V
V
CC
= 1V
L/M
R/S/T
TEMPERATURE (
C)
30
40
50
20
10
0
-40
0
20
-20
40
60
85
POWER-DOWN RESET DELAY (
sec)
Power-Down Reset Delay vs. Temperature
(TC127xL/M/R/S/T)
V
O
OD
0mV
= 20
V
OD
= 20mV
V
OD
= 100mV
V
OD
= 200mV
V
OD
= 100mV
V
OD
= 200mV
1.0010
1.0020
1.0030
1.0000
0.9990
0.9980
0.9970
0.9960
0.9950
0.9940
TEMPERATURE (
C)
-40
10
35
-15
65
60
NORMALIZED THRESHOLD (V)
Normalized Reset Threshold vs. Temperature
2002 Microchip Technology Inc.
DS21381B-page 7
TC1270/TC1271
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
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
Part Number
(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
5.2
Package Dimensions
1
&
= part number code + temperature range
2
(two-digit code)
3
represents year and quarter code
4
represents production lot ID code
.079 (2.00)
.071 (1.80)
.055 (1.40)
.047 (1.20)
.098 (2.50)
.083 (2.10)
.120 (3.05)
.105 (2.67)
.006 (0.15)
.004 (0.09)
.010 (0.25)
.005 (0.13)
.080 (2.03)
.070 (1.78)
.004 (0.10)
.001(0.02)
.040 (1.02)
.031 (0.79)
.037 (0.94)
.030 (0.77)
.021 (0.54)
.015 (0.38)
8
MAX.
4-Pin SOT-143
Dimensions: inches (mm)
TC1270/TC1271
DS21381B-page 8
2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc.
DS21381B-page9
TC1270/TC1271
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
Your local Microchip sales office
2.
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3.
The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
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Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
TC1270/TC1271
DS21381B-page10
2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc.
DS21381B-page 11
TC1270/TC1271
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 com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
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L
OQ
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MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
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dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
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Serialized Quick Turn Programming (SQTP) is a service mark
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All other trademarks mentioned herein are property of their
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2002, Microchip Technology Incorporated, Printed in the
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DS21381B-page 12
2002 Microchip Technology Inc.
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Tel: 45 4420 9895 Fax: 45 4420 9910
France
Microchip Technology SARL
Parc d'Activite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Italy
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
United Kingdom
Microchip Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
05/01/02
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