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PDF TC1275 Data sheet ( Hoja de datos )

Número de pieza TC1275
Descripción (TC1275 / TC1276 / TC1277) 3-Pin Reset Monitors for 3.3V Systems
Fabricantes Microchip Technology 
Logotipo Microchip Technology Logotipo



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TC1275/TC1276/TC1277
3-Pin Reset Monitors for 3.3V Systems
Features
• Precision VCC Monitor for 3.3V Systems
• 100msec Minimum RESET, RESET Output
Duration
• Output Valid to VCC = 1.2V
• VCC Transient Immunity
• Small 3-Pin SOT-23B Package
• No External Components
Applications
• Computers
• Embedded Systems
• Battery Powered Equipment
Critical µP Power Supply Monitoring
Device Selection Table
Part
Number
Order
Package
Temp.
Range
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
TC1277-xENB Complimentary 3-Pin SOT-23B -40°C to +85°C
NOTE: “x” denotes a suffix for VCC threshold (see table below).
Suffix
5
10
20
Package Type
Reset VCC Threshold (V)
3.06
2.88
2.55
3-Pin SOT-23B
General Description
The TC1275/TC1276/TC1277 are cost-effective
system supervisor circuits designed to monitor VCC in
digital systems and provide a reset signal to the host
processor when necessary. No external components
are required.
The reset output is driven active within 20µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100msec after VCC
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
TC1275 and TC1276 is valid down to VCC = 1.2V. The
TC1277 is valid down to VCC = 1.8V. All three devices
are available in a 3-Pin SOT-23B package.
The TC1275/TC1276/TC1277 devices are optimized to
reject fast transient glitches on the VCC line.
Typical Operating Circuit
VCC
2
VCC
1
RESET
VCC
Processor
RESET
Input
TC1275
GND
3
GND
RESET 1
*(RESET)
TC1275-xENB
TC1276-xENB 3 GND
TC1277-xENB
VCC 2
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236
*( ) is for TC1277
© 2002 Microchip Technology Inc.
DS21383B-page 1

1 page




TC1275 pdf
TC1275/TC1276/TC1277
3.2 VCC Transient Rejection
The TC1275/TC1276/TC1277 provides accurate VCC
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
close proximity to the VCC pin of the TC1275/TC1276/
TC1277.
3.3 RESET Signal Integrity During
Power-Down
The TC1275 RESET output is valid to VCC = 1.2V.
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 VCC =
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
(100kwill be suitable for most applications). Similarly,
a pull-up resistor to VCC is required for the TC1277 to
ensure a valid high RESET for VCC below 1.8V.
FIGURE 3-5:
VCC
MAXIMUM TRANSIENT
DURATION VS.
OVERDRIVE FOR GLITCH
REJECTION AT 25°C
VTH
Overdrive
Duration
500
TA °C
400
300
200
100 TC1275/6/7
0
1 10 100 1000
RESET COMPARATOR OVERDRIVE,
[VCCTP - VCC] (mV)
FIGURE 3-6:
ENSURING RESET VALID
TO VCC = 0V
VCC
VCC
TC1275
RESET
GND
R1
100k
© 2002 Microchip Technology Inc.
DS21383B-page 5

5 Page





TC1275 arduino
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 Microchips 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.
© 2002 Microchip Technology Inc.
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
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
DS21383B-page 11

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