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PDF TC1278 Data sheet ( Hoja de datos )
| Número de pieza | TC1278 | |
| Descripción | (TC1279) 3-Pin Reset Monitors for 5V Systems | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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TC1278/TC1279
3-Pin Reset Monitors for 5V Systems
Features
• Precision VCC Monitor for 5.0V System Supplies
• 250msec Minimum 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
TC1278-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C
TC1279-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C
NOTE: “x” denotes a suffix for VCC threshold (see table below).
Suffix
5
10
15
Package Type
Reset VCC Threshold (V)
4.625
4.375
4.125
3-Pin SOT-23B
General Description
The TC1278/TC1279 are cost-effective system super-
visor 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 5µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 250msec after VCC
rises above the reset threshold. The TC1278 has an
active-high RESET output while the TC1279 has an
active-low RESET output, and both devices have an
open drain output stage. The output is valid down to
VCC = 1.2V. Both devices are available in a 3-Pin SOT-
23B package.
Typical Operating Circuit
VCC
2
VCC
1
RESET
VCC
Processor
RESET
Input
TC1279
GND
3
GND
RESET 1
TC1278-xENB
TC1279-xENB 3 GND
VCC 2
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236
© 2002 Microchip Technology Inc.
DS21384B-page 1
1 page  
3.2 VCC Transient Rejection
The TC1278/TC1279 provides accurate VCC 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 3-5 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 TC1278/TC1279.
TC1278/TC1279
FIGURE 3-5:
VCC
MAXIMUM TRANSIENT
DURATION VS.
OVERDRIVE FOR GLITCH
REJECTION AT 25°C
VCCTP
Overdrive
5
TA
4
Duration
°C
3
2
1 TC1278/9
0
1 5 100 1000
RESET COMPARATOR OVERDRIVE,
[VCCTP - VCC] (mV)
© 2002 Microchip Technology Inc.
DS21384B-page 5
5 Page 
TC1278/1279
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.
© 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.
DS21384B-page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC1278.PDF ] | |
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