TC1279 Microchip Technology, TC1279 Datasheet

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TC1279

Manufacturer Part Number
TC1279
Description
(TC1278) 3-Pin Reset Monitors for 5V Systems
Manufacturer
Microchip Technology
Datasheet
Features
• Precision V
• 250msec Minimum RESET Output Duration
• Output Valid to V
• V
• Small 3-Pin SOT-23B Package
• No External Components
Applications
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
Device Selection Table
NOTE: “x” denotes a suffix for V
Package Type
©
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
2002 Microchip Technology Inc.
Number
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236
CC
Part
Transient Immunity
RESET
Suffix
10
15
V
5
CC
CC
Monitor for 5.0V System Supplies
Order
1
2
3-Pin SOT-23B
CC
TC1278-xENB
TC1279-xENB
= 1.2V
3-Pin Reset Monitors for 5V Systems
CC
Reset V
threshold (see table below).
Package
CC
3
4.625
4.375
4.125
Threshold (V)
GND
Range
Temp.
TC1278/TC1279
General Description
The TC1278/TC1279 are cost-effective system super-
visor circuits designed to monitor V
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 V
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 250msec after V
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
V
23B package.
Typical Operating Circuit
CC
V
CC
= 1.2V. Both devices are available in a 3-Pin SOT-
TC1279
GND
3
2
V
CC
RESET
1
CC
in digital systems
DS21384B-page 1
RESET
Input
Processor
GND
V
CC
CC
CC

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TC1279 Summary of contents

Page 1

... Critical µP Power Supply Monitoring Device Selection Table Part Order Package Number 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 V threshold (see table below). CC Suffix Reset ...

Page 2

... Output Current, RESET....................................... 20mA ≤ 70°C) Power Dissipation (T 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 TC1278/TC1279 ELECTRICAL SPECIFICATIONS Recommended DC Operating Conditions: T Symbol Parameter V Supply Voltage CC DC Electrical Characteristics -40° ...

Page 3

... The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. Symbol (3-Pin SOT-23B) 1 RESET (TC1279) RESET output remains low while V 350msec (250msec min.) after V TC1279 is open drain. 1 RESET (TC1278) RESET output remains high while V 350msec (250msec min.) after V TC1278 is open drain Supply voltage (1.2V to 5.5V). CC ...

Page 4

... TC1278/TC1279 3.0 APPLICATIONS INFORMATION 3.1 Operation – Power Monitor The TC1278/TC1279 provide the function of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power failure. When V is detected as out-of-tolerance, the RESET CC signal is asserted. On power-up, RESET is kept active for approximately 350msec after the power supply has reached the selected tolerance ...

Page 5

... V Transient Rejection CC The TC1278/TC1279 provides accurate V 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 ...

Page 6

... Carrier Tape, Number of Components Per Reel and Reel Size Package 3-Pin SOT-23B DS21384B-page 6 Part Number TC1278-5ENB TC1278-10ENB TC1278-15ENB TC1279-5ENB TC1279-10ENB TC1279-15ENB represents year and 2-month code 3 represents production lot ID code 4 User Direction of Feed P Standard Reel Component Orientation For TR Suffix Device (Mark Right Side Up) ...

Page 7

... Package Dimensions 3-Pin SOT-23B .104 (2.64) .083 (2.10) .040 (1.02) .031 (0.79) .004 (0.10) .001 (0.02) 2002 Microchip Technology Inc. © TC1278/TC1279 .021 (0.54) .015 (0.37) .055 (1.40) .047 (1.20) .024 (0.60) .017 (0.44) .120 (3.05) .105 (2.67) 8° MAX. .010 (0.25) .005 (0.13) .081 (2.05) .070 (1.78) Dimensions: inches (mm) .007 (0.18) .003 (0.08) DS21384B-page 7 ...

Page 8

... TC1278/TC1279 NOTES: DS21384B-page 8 2002 Microchip Technology Inc. © ...

Page 9

... 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. TC1278/TC1279 DS21384B-page9 ...

Page 10

... TC1278/TC1279 NOTES: DS21384B-page10  2002 Microchip Technology Inc. ...

Page 11

... Serialized Quick Turn Programming (SQTP 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, ...

Page 12

... Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan Microchip Technology Taiwan 11F-3, No. 207 ...

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