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PDF TC1274 Data sheet ( Hoja de datos )
| Número de pieza | TC1274 | |
| Descripción | (TC1272 / TC1273 / TC1274) 3-Pin Reset Monitors for 5V Systems | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC1274 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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M TC1272/TC1273/TC1274
3-Pin Reset Monitors for 5V Systems
Features
• Precision VCC Monitor for 5.0V Systems
• 100 msec 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
Package Type
3-Pin SOT-23B*
RESET 1
**(RESET)
VCC 2
TC1272
TC1273
TC1274
3 GND
* 3-Pin SOT-23B is equivalent to JEDEC TO-236
**( ) is for TC1274
General Description
The TC1272/TC1273/TC1274 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 20 µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 msec after
VCC rises above the reset threshold. The TC1274 has
an active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET output. The
TC1272 and TC1274 each have a complimentary out-
put, while the TC1273 has an open-drain output. The
output of the TC1272 and TC1273 is valid down to VCC
= 1.2V. The TC1274 is valid down to VCC = 1.8V. All
three devices are available in a 3-Pin SOT-23B
package.
The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the VCC line.
Typical Operating Circuit
VCC
2
VCC
VCC
1
RESET
TC1272
GND
3
RESET
Input
Processor
GND
2003 Microchip Technology Inc.
DS21382B-page 1
1 page  
TC1272/TC1273/TC1274
4.0 APPLICATIONS INFORMATION
4.1 Operation – Power Monitor
The TC1272/TC1273/TC1274 is designed to function
as a voltage monitor for +5V systems. These devices
provide a RESET signal to indicate that the VCC has
dropped below a preset voltage level that is selected by
the suffix part number. In addition, the RESET is held
active for approximately 200 ms after the power supply
has risen above the voltage threshold level to allow
time for the power supply to stabilize before system
operation commences.
VCCTP(MIN)
tR
VCVCCTCPTP(MAX)
VCC
RESET
tRPU1
VOH
FIGURE 4-1:
Timing Diagram – Power Up
(TC1272/TC1273).
VCC
VCCTP(MAX)
VCCTP
tF
VCCTP(MIN)
VCC
tR
VCCTP(MIN)
VCCTP(MAX)
VCCTP
tRPU2
RESET
FIGURE 4-3:
(TC1274).
VOL
Timing Diagram – Power Up
VCC
VCCTP(MAX)VCCTP
tF
VCCTP(MIN)
tRPD2
RESET
VOH
RESET Slews With VCC
FIGURE 4-4:
Timing Diagram –
Power Down (TC1274).
RESET
tRPD1
VOL
FIGURE 4-2:
Timing Diagram – Power
Down (TC1272/TC1273).
2003 Microchip Technology Inc.
DS21382B-page 5
5 Page 
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such
acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
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 components in
life support systems is not authorized except with express
written approval by Microchip. No licenses are conveyed,
implicitly or otherwise, under any intellectual property rights.
2003 Microchip Technology Inc.
Trademarks
The Microchip name and logo, the Microchip logo, KEELOQ,
MPLAB, PIC, PICmicro, PICSTART, PRO MATE and
PowerSmart are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL
and The Embedded Control Solutions Company are registered
trademarks of Microchip Technology Incorporated in the U.S.A.
Accuron, Application Maestro, dsPIC, dsPICDEM,
dsPICDEM.net, ECONOMONITOR, FanSense, FlexROM,
fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC,
microPort, Migratable Memory, MPASM, MPLIB, MPLINK,
MPSIM, PICC, PICkit, PICDEM, PICDEM.net, PowerCal,
PowerInfo, PowerMate, PowerTool, rfLAB, rfPIC, Select Mode,
SmartSensor, SmartShunt, SmartTel and Total Endurance are
trademarks of Microchip Technology Incorporated in the U.S.A.
and other countries.
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.
© 2003, 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
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
DS21382B - page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC1274.PDF ] | |
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