TC1277-XENB [MICROCHIP]
3-Pin Reset Monitors for 3.3V Systems; 3引脚复位监视器为3.3V系统
| 型号： | TC1277-XENB |
| 厂家： | 
MICROCHIP |
| 描述： | 3-Pin Reset Monitors for 3.3V Systems |
| 文件： | 总13页 (文件大小：472K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC1275/TC1276/TC1277
3-Pin Reset Monitors for 3.3V Systems
Features
General Description
• Precision V Monitor for 3.3V Systems
The TC1275/TC1276/TC1277 are cost-effective
CC
system supervisor circuits designed to monitor V in
• 100msec Minimum RESET, RESET Output
Duration
CC
digital systems and provide a reset signal to the host
processor when necessary. No external components
are required.
• Output Valid to V = 1.2V
CC
• V Transient Immunity
CC
The reset output is driven active within 20µsec of V
CC
• Small 3-Pin SOT-23B Package
• No External Components
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100msec after V
CC
rises above the reset threshold. The TC1277 has an
active-high RESET output while the TC1275 and
TC1276 have an active-low RESET output. TC1275
and TC1277 each have a complimentary output while
the TC1276 has an open drain output. The output of the
Applications
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
TC1275 and TC1276 is valid down to V = 1.2V. The
CC
TC1277 is valid down to V = 1.8V. All three devices
CC
are available in a 3-Pin SOT-23B package.
Device Selection Table
The TC1275/TC1276/TC1277 devices are optimized to
reject fast transient glitches on the V line.
Part
Number
Temp.
Range
CC
Order
Package
Typical Operating Circuit
TC1275-xENB Complimentary 3-Pin SOT-23B -40°C to +85°C
TC1276-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C
V
CC
TC1277-xENB Complimentary 3-Pin SOT-23B -40°C to +85°C
2
V
V
CC
CC
NOTE: “x” denotes a suffix for VCC threshold (see table below).
Processor
1
RESET
Input
Suffix
Reset V Threshold (V)
RESET
CC
5
3.06
2.88
2.55
TC1275
10
20
GND
3
GND
Package Type
3-Pin SOT-23B
RESET
1
*(RESET)
TC1275-xENB
TC1276-xENB
TC1277-xENB
GND
3
V
2
CC
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236
*( ) is for TC1277
2002 Microchip Technology Inc.
DS21383B-page 1
TC1275/TC1276/TC1277
*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
Power Dissipation (T ≤ 70°C)
A
3-Pin SOT-23B (derate 4mW/°C above +70°C)
.................................................................230mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range ..............-65°C to +150°C
TC1275/TC1276/TC1277 ELECTRICAL SPECIFICATIONS
Recommended DC Operating Conditions: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Supply Voltage
Min
Typ
Max Units
Device
Test Conditions
VCC
1.2
1.8
—
—
5.5
5.5
V
TC1275, TC1276 Note 1
TC1277
DC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min
Typ
Max Units
Test Conditions
TC1275, TC1277 Note 1
VOH
IOH
Output Voltage @ 0-500µA
VCC – 0.5V VCC – 0.1V
—
V
Output Current @ 2.4 Volts
VCC = 5V
VCC = 2.7V
mA
—
—
13
1.3
—
—
TC1275
Note 2
Note 2, Note 5
TC1275, TC1277 Note 3
TC1277
IOL
ICC
Output Current @ 0.4 Volts
+10
30
—
mA
Operating Current
VCC < 5.5V
VCCTP < VCC < 5.5V
VCC < VCCTP
µA
—
—
—
20
20
350
35
35
TC1276
TC1276
Note 3
Note 3
700
VCCTP-5 VCC Trip Point (TC1275/6/7-5)
VCCTP-10 VCC Trip Point (TC1275/6/7-10)
VCCTP-20 VCC Trip Point (TC1275/6/7-20)
2.98
2.80
2.47
—
3.06
2.88
2.55
9
3.15
2.97
2.64
—
V
V
Note 1
Note 1
Note 1
V
COUT
RP
Output Capacitance
pF
Internal Pull-Up Resistor
3.0
6.0
9.0
kΩ TC1276
AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min
Typ
Max Units
Test Conditions
tRST
tRPD1
tRPD2
tF
RESET Active Time
VCC Detect to RESET
VCC Detect to RESET
100
—
200
20
20
—
300 msec
50
50
—
µsec TC1275, TC1276 VCC(LOW) = 1V, Figure 3-2
—
µsec TC1277
µsec
VCC(LOW) = 1V, Figure 3-4
Figure 3-2, Figure 3-4
VCC Slew Rate
300
(VCCTP(MAX) to VCCTP(MIN))
tR
VCC Slew Rate
0
—
—
nsec
Figure 3-1, Figure 3-3
(VCCTP(MIN) to VCCTP(MAX))
tRPU1
tRPU2
VCC Detect to RESET
VCC Detect to RESET
100
100
200
200
300 msec TC1275, TC1276 Note 4, Figure 3-1
300 msec TC1277 Note 4, Figure 3-3
Note 1: All voltages referenced to ground.
2: Measured with VCC ≥ 2.7 volts.
3: Measured with RESET output open for TC1275/TC1276; measured with RESET output open for TC1277.
4: tR = 5µsec.
5: A 1kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using
the TC1276.
DS21383B-page 2
2002 Microchip Technology Inc.
TC1275/TC1276/TC1277
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(3-Pin SOT-23B)
Symbol
Description
1
RESET (TC1275/ RESET output remains low while VCC is below the reset voltage threshold, and for
TC1276)
200msec (100msec min.) after VCC rises above reset threshold. The output stage of the
TC1275 is complimentary. The output stage of the TC1276 is open drain.
1
RESET (TC1277) RESET output remains high while VCC is below the reset voltage threshold, and for
200msec (100msec min.) after VCC rises above reset threshold. The output stage of the
TC1277 is complimentary.
2
3
VCC
Supply voltage (1.2V to 5.5V TC1275 and TC1276, 1.8V to 5.5V TC1277).
GND
Ground.
2002 Microchip Technology Inc.
DS21383B-page 3
TC1275/TC1276/TC1277
FIGURE 3-3:
Timing Diagram –
Power Up (TC1277)
3.0
3.1
APPLICATIONS INFORMATION
Operation – Power Monitor
t
R
The TC1275/TC1276/TC1277 provide the function
of detecting out-of-tolerance power supply conditions
and warning a processor-based system of impending
V
(MAX)
CCTP
power failure. When V
is detected as out-of-
CC
V
CCTP
V
(MIN)
CCTP
tolerance, the RESET signal is asserted. On power-up,
RESET is kept active for approximately 200msec after
the power supply has reached the selected tolerance.
This allows the power supply and microprocessor to
stabilize before RESET is released.
V
CC
t
RPU2
FIGURE 3-1:
Timing Diagram – Power
Up (TC1275/TC1276)
V
OL
RESET
t
R
V
(MAX)
CCTP
FIGURE 3-4:
Timing Diagram –
Power Down (TC1277)
V
CCTP
V
(MIN)
CCTP
t
F
V
CC
V
CC
V
(MAX)
CCTP
t
RPU
1
V
CCTP
V
(MIN)
CCTP
V
OH
RESET
t
RPD2
FIGURE 3-2:
Timing Diagram – Power
Down (TC1275/TC1276)
V
t
OH
F
RESET SLEWS WITH V
CC
V
CC
RESET
V
(MAX)
CCTP
V
CCTP
V
(MIN)
CCTP
t
RPD1
RESET
V
OL
DS21383B-page 4
2002 Microchip Technology Inc.
TC1275/TC1276/TC1277
FIGURE 3-5:
MAXIMUM TRANSIENT
DURATION VS.
OVERDRIVE FOR GLITCH
REJECTION AT 25°C
3.2
VCC Transient Rejection
The TC1275/TC1276/TC1277 provides accurate V
CC
monitoring and reset timing during power-up, power-
down, and brownout/sag conditions, and rejects
negative-going transients (glitches) on the power
supply line. Figure 3-5 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. Transient
immunity can be improved by adding a capacitor in
V
CC
V
TH
Overdrive
close proximity to the V pin of the TC1275/TC1276/
TC1277.
CC
Duration
C
500
T
A
3.3
RESET Signal Integrity During
Power-Down
400
300
200
The TC1275 RESET output is valid to V
= 1.2V.
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 undeter-
mined voltage. Most digital systems are completely
shut down well above this voltage. However, in situa-
tions where RESET must be maintained valid to V
=
CC
TC1275/6/7
100
100
0
0V, a pull-down resistor must be connected from
RESET to ground to discharge stray capacitances and
hold the output low (Figure 3-6). 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,
1
10
1000
RESET C[OVMPARATOR OVERDRIVE,
- V ] (mV)
CCTP
CC
a pull-up resistor to V
is required for the TC1277 to
CC
ensure a valid high RESET for V below 1.8V.
CC
FIGURE 3-6:
ENSURING RESET VALID
TO V = 0V
CC
V
CC
V
CC
TC1275
RESET
R1
100k
GND
2002 Microchip Technology Inc.
DS21383B-page 5
TC1275/TC1276/TC1277
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.
Reset Delays vs.
V
Detect To RESET (RESET)
CC
Comparator Overdrive
T
= 25°C
A
300
200
T
= 25°C
A
100000
10000
1000
V
= 2V
100
0
100
10
1
10
1000 10000
SLEW RATE (V/ sec)
100
100000
4
5
0
1
2
3
V
µ
CC
COMPARATOR OVERDRIVE (V)
DS21383B-page 6
2002 Microchip Technology Inc.
TC1275/TC1276/TC1277
TC1276 (V)
2.55
Code
EA
EB
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
2.88
3.06
EC
TC1277 (V)
2.55
Code
FA
2.88
FB
3.06
FC
ex: 1275-20 = D A
3
represents year and quarter code
represents production lot ID code
1
2
&
= part number code + temperature range
and voltage
4
TC1275 (V)
2.55
Code
DA
2.88
DB
3.06
DC
5.2
Taping Form
Component Taping Orientation for 3-Pin SOT-23B (JEDEC TO-236) Devices
User Direction of Feed
Device
Marking
W
PIN 1
P
Standard Reel Component Orientation
For TR Suffix Device
(Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
3-Pin SOT-23B
8 mm
4 mm
3000
7 in
2002 Microchip Technology Inc.
DS21383B-page 7
TC1275/TC1276/TC1277
5.3
Package Dimensions
3-Pin SOT-23B
.021 (0.54)
.015 (0.37)
.055 (1.40)
.047 (1.20)
.104 (2.64)
.083 (2.10)
.024 (0.60)
.017 (0.44)
.120 (3.05)
.105 (2.67)
.007 (0.18)
.003 (0.08)
8 MAX.
.040 (1.02)
.031 (0.79)
.010 (0.25)
.005 (0.13)
.004 (0.10)
.001 (0.02)
.081 (2.05)
.070 (1.78)
Dimensions: inches (mm)
DS21383B-page 8
2002 Microchip Technology Inc.
TC1275/TC1276/TC1277
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.
2002 Microchip Technology Inc.
DS21383B-page9
TC1275/TC1276/TC1277
NOTES:
DS21383B-page10
2002 Microchip Technology Inc.
TC1275/1276/1277
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,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
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.
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® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
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design and manufacture of development
systems is ISO 9001 certified.
2002 Microchip Technology Inc.
DS21383B-page 11
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05/01/02
DS21383B-page 12
2002 Microchip Technology Inc.
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