TC1270ANLBVCT [MICROCHIP]
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| 型号： | TC1270ANLBVCT |
| 厂家： | 
MICROCHIP |
| 描述： | 暂无描述 监视器 |
| 文件： | 总12页 (文件大小：468K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC1270/TC1271
4-Pin µP Reset Monitors
Features
Package Type
• Precision V Monitor for 1.8V, 2.7V, 3.0V, 3.3V
and 5.0V Nominal Supplies
4-Pin SOT-143
CC
• Manual Reset Input
V
4
3
CC
• 140msec Minimum RESET, RESET Output
Duration
1
2
GND
TC1270
TC1271
• RESET Output Valid to V = 1.0V (TC1270)
CC
• Low 7µA Supply Current
• V Transient Immunity
CC
MR
TC1270 RESET
TC1271 (RESET)
• Small 4-Pin SOT-143 Package
• No External Components
• Replacement for MAX811/812 and Offers a Lower
Threshold Voltage Option
General Description
The TC1270 and TC1271 are cost-effective system
supervisor circuits designed to monitor V in digital
Applications
CC
• Computers
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
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
for use as
a
push-button reset. No external
components are required.
The reset output is driven active within 20µsec (4µsec
Device Selection Table
for F version) of V falling through the reset voltage
CC
Part Number
Package
Temp. Range
threshold. RESET is maintained active for a minimum
of 140msec after V rises above the reset threshold.
The TC1271 has an active-high RESET output while
the TC1270 has an active-low RESET output. The
CC
TC1270xERC
TC1271xERC
4-Pin SOT-143 -40°C to +85°C
4-Pin SOT-143 -40°C to +85°C
output of the TC1270 is valid down to V = 1V. Both
devices are available in a 4-Pin SOT-143 package.
CC
NOTE: “x” denotes a suffix for VCC threshold (see table
below)
The TC1270/TC1271 devices are optimized to reject
Suffix*
Reset V Threshold (V)
CC
fast transient glitches on the V
line. Low supply
CC
current of 7µA (V
= 3.3V) makes these devices
suitable for battery powered applications.
L
M
T
4.63
4.38
3.08
2.93
2.63
1.75
CC
Typical Operating Circuit
S
R
F
V
CC
V
V
CC
CC
Processor
*Custom thresholds available, contact factory.
RESET
Input
MR
RESET
Push-
Button
(Active Low)
TC1270
GND
GND
2002 Microchip Technology Inc.
DS21381B-page 1
TC1270/TC1271
*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.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage (V to GND) .............................+6.0V
CC
RESET, RESET.......................... -0.3V to (V + 0.3V)
CC
Input Current, V ...............................................20mA
CC
Output Current, RESET, RESET.........................20mA
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range ..............-65°C to +150°C
TC1270/TC1271 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, VCC = 2.0V for F
version. TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. (Note 1).
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
VCC
ICC
VCC Range
1.2
—
5.5
V
Supply Current
—
—
—
7
10
6
15
15
12
µA
VCC > VTH, for L/M/R/S/T/F
VCC < VTH, for L/M/R/S/T
VCC < VTH, for F
VTH
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; TA = +25°C
T
A = -40°C to +85°C
TC127_M; TA = +25°C
A = -40°C to +85°C
TC127_T; TA = +25°C
A = -40°C to +85°C
TC127_S; TA = +25°C
A = -40°C to +85°C
TC127_R; TA = +25°C
A = -40°C to +85°C
TC127_F; TA = +25°C
A = -40°C to +85°C
T
T
T
T
T
Reset Threshold Tempco
VCC to Reset Delay
—
30
—
ppm/°C
—
—
20
5
—
—
µsec VCC = VTH to VTH – 125mV; L/M/R/S/T/F
tRP
tMR
tMD
Reset Active Timeout Period
MR Minimum Pulse Width
MR Glitch Immunity
140
10
—
280
—
560
—
msec VCC = VTH(MAX)
µsec
µsec
µsec
0.1
0.5
—
MR to Reset Propagation Delay
MR Input Threshold
—
—
VIH
VIL
2.3
—
—
—
—
0.8
V
VCC > VTH(MAX)
,
TC127_L/M
VIH
VIL
0.7 VCC
—
—
—
—
V
VCC > VTH(MAX)
TC127_R/S/T/F
,
0.15 VCC
MR Pull-up Resistance
10
20
40
kΩ
Note 1: Production testing done at TA = +25°C, over temperature limits ensured by design.
2: RESET output for TC1270, RESET output for TC1271.
DS21381B-page 2
2002 Microchip Technology Inc.
TC1270/TC1271
TC1270/TC1271 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, VCC = 2.0V for F
version. TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. (Note 1).
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
VOH
RESET Output Voltage High
(TC1271)
0.8 VCC
—
—
V
ISOURCE = 150µA;
VCC ≤ VTH(MIN)
VOL
VOL
VOH
RESET Output Voltage Low
(TC1271)
V
V
V
TC1271F only,
ISINK = 500µA,
VCC = VTH(MAX)
—
—
0.2
TC1271R/S/T only,
—
—
—
—
0.3
0.4
ISINK = 1.2mA, VCC = VTH(MAX)
TC1271L/M only, ISINK = 3.2mA,
VCC = VTH(MAX)
RESET Output Voltage Low
(TC1270)
—
—
0.3
TC1270R/S/T only,
ISINK = 1.2mA, VCC = VTH(MIN)
TC1270F only:
ISINK = 500µA, VCC = VTH(MIN)
TC1270L/M only,
ISINK = 3.2mA, VCC = VTH(MIN)
ISINK = 50µA, VCC > 1.0V
—
—
—
—
0.4
TBD
RESET Output Voltage High
(TC1270)
VCC – 1.5
—
—
TC1270L/M only,
ISOURCE = 800µA,
VCC = VTH(MAX)
0.8 VCC
—
—
TC1270R/S/T/F only,
ISOURCE = 500µA,
VCC = VTH(MAX)
Note 1: Production testing done at TA = +25°C, over temperature limits ensured by design.
2: RESET output for TC1270, RESET output for TC1271.
2002 Microchip Technology Inc.
DS21381B-page 3
TC1270/TC1271
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
2
GND
Ground.
RESET
(TC1270)
RESET output remains low while VCC is below the reset voltage threshold, and for at least
140msec min. after VCC rises above reset threshold.
2
RESET
(TC1271)
RESET output remains high while VCC is below the reset voltage threshold, and for at least
140msec min. after VCC rises above reset threshold.
3
4
MR
Manual reset input generates a reset when MR is below VIL.
VCC
Supply voltage.
DS21381B-page 4
2002 Microchip Technology Inc.
TC1270/TC1271
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 (100kΩ will be suitable for most
3.0
3.1
APPLICATIONS INFORMATION
VCC Transient Rejection
The TC1270/TC1271 provides accurate V monitor-
CC
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
applications). Similarly, a pull-up resistor to V
is
CC
required for the TC1271 to ensure a valid high RESET
for V below 1.1V.
CC
FIGURE 3-2:
ENSURING RESET VALID
TO V = 0V
CC
V
CC
V
pin of the TC1270/TC1271.
CC
V
CC
FIGURE 3-1:
MAXIMUM TRANSIENT
DURATION VS.
OVERDRIVE FOR GLITCH
REJECTION AT 25°C
TC1270
RESET
R1
100k
GND
V
CC
V
TH
Overdrive
3.3
Processors With Bidirectional
I/O Pins
Some µP'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 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
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 µP, the buffer should be
connected as shown with the solid line.
Duration
400
T
C
A
320
240
160
TC127LMJ
FIGURE 3-3:
INTERFACING TO
BIDIRECTIONAL
RESET I/O
80
0
TC127xR/S/T
10
1
1000
100
Buffered RESET
Buffer
To Other System
Components
RESET COMPARATOR OVERDRIVE,
- V (mV)
V
TH
CC
V
CC
3.2
RESET Signal Integrity During
Power-Down
V
CC
V
CC
µP
RESET
TC1270
RESET
4.7k
The TC1270 RESET output is valid to V
= 1.0V.
CC
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 must be
GND
GND
maintained valid to V = 0V, a pull-down resistor must
CC
2002 Microchip Technology Inc.
DS21381B-page 5
TC1270/TC1271
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.
Supply Current vs.Temperature
(No Load, TC127xR/S/T/F)
Supply Current vs.Temperature
(No Load, TC127xL/M)
14
12
8
6
10
8
V
= 5V
CC
V
= 5V
CC
4
2
V
= 3V
CC
V
= 3V
6
CC
V
= 1V
CC
60
4
V
= 1V
CC
2
0
-40
0
-20
0
20
40
60
85
-40
-20
0
20
40
85
TEMPERATURE (C)
TEMPERATURE (C)
Power-Down Reset Delay vs. Temperature
(TC127xF)
Power-Down Reset Delay vs. Temperature
(TC127xL/M/R/S/T)
50
50
L/M
V
= 20mV
V
OD
= 100mV
OD
40
30
40
30
20
10
V
= 200mV
OD
V
= 20mV
OD
R/S/T
20
V
= 200mV
V
OD
= 100mV
V
= 20mV
OD
OD
10
0
V
= 100mV
60
OD
V
= 200 mV
-20
OD
0
-40
0
40
20
85
-40
-20
0
40
60
20
85
TEMPERATURE (C)
TEMPERATURE (C)
Normalized Reset Threshold vs. Temperature
Power-Up Reset Timeout vs. Temperature
1.0030
1.0020
1.0010
1.0000
0.9990
250
245
240
235
TC127xL/M
0.9980
TC127xR/S/T/F
0.9970
0.9960
0.9950
0.9940
230
225
60
65
35
-40
-20
0
40
TEMPERATURE (C)
60
-40
-15
10
20
85
TEMPERATURE (C)
DS21381B-page 6
2002 Microchip Technology Inc.
TC1270/TC1271
Part Number
TC1271LERC
TC1271MERC
TC1271TERC
TC1271SERC
TC1271RERC
TC1271FERC
(V)
Code
T1
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
4.63
4.38
3.08
2.93
2.63
1.75
T2
T3
T4
T5
T7
3
represents year and quarter code
represents production lot ID code
4
1
2
&
= part number code + temperature range
(two-digit code)
Part Number
TC1270LERC
TC1270MERC
TC1270TERC
TC1270SERC
TC1270RERC
TC1270FERC
(V)
Code
S1
4.63
4.38
3.08
2.93
2.63
1.75
S2
S3
S4
S5
S7
5.2
Package Dimensions
4-Pin SOT-143
.079 (2.00)
.071 (1.80)
.055 (1.40)
.047 (1.20)
.098 (2.50)
.083 (2.10)
.080 (2.03)
.070 (1.78)
.120 (3.05)
.105 (2.67)
.040 (1.02)
.031 (0.79)
.006 (0.15)
.004 (0.09)
8MAX.
.004 (0.10)
.001(0.02)
.021 (0.54)
.015 (0.38)
.010 (0.25)
.005 (0.13)
.037 (0.94)
.030 (0.77)
Dimensions: inches (mm)
2002 Microchip Technology Inc.
DS21381B-page 7
TC1270/TC1271
NOTES:
DS21381B-page 8
2002 Microchip Technology Inc.
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.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21381B-page9
TC1270/TC1271
NOTES:
DS21381B-page10
2002 Microchip Technology Inc.
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
The Microchip name and logo, the Microchip logo, FilterLab,
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Solutions Company are registered trademarks of Microchip Tech-
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dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, MXLAB, PICC, PICDEM, PICDEM.net, rfPIC, Select
Mode and Total Endurance are trademarks of Microchip
Technology Incorporated in the U.S.A.
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.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
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and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
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devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
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systems is ISO 9001 certified.
2002 Microchip Technology Inc.
DS21381B-page 11
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05/01/02
DS21381B-page 12
2002 Microchip Technology Inc.
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