View TC1279-5ENB_1321962.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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
General Description
The TC1278/TC1279 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 5sec 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 SOT23B package.
Applications
* * * * Computers Embedded Systems Battery Powered Equipment Critical P Power Supply Monitoring
Device Selection Table
Part Number Order Package Temp. Range
Typical Operating Circuit
VCC 2 VCC 1 RESET VCC Processor RESET Input
TC1278-xENB Open Drain 3-Pin SOT-23B -40C to +85C TC1279-xENB Open Drain 3-Pin SOT-23B -40C to +85C
NOTE: "x" denotes a suffix for VCC threshold (see table below).
TC1279
GND 3 GND
Suffix 5 10 15
Reset VCC Threshold (V) 4.625 4.375 4.125
Package Type
3-Pin SOT-23B
RESET 1 TC1278-xENB TC1279-xENB VCC
3
GND
2
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236
2002 Microchip Technology Inc.
DS21384B-page 1
(c)
TC1278/TC1279
1.0 ELECTRICAL CHARACTERISTICS
*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.
Absolute Maximum Ratings*
Supply Voltage (V CC to GND) ..............................+6.0V RESET, RESET...........................-0.3V to (VCC + 0.3V) Input Current, VCC ...............................................20mA Output Current, RESET....................................... 20mA Power Dissipation (TA 70C) 3-Pin SOT-23B (derate 4mW/C above +70C) .................................................................230mW Operating Temperature Range............. -40C to +85C Storage Temperature Range .............. -65C to +150C
TC1278/TC1279 ELECTRICAL SPECIFICATIONS
Recommended DC Operating Conditions: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. Symbol VCC Symbol VOL IOL ICC1 ICC2 VCCTP-5 Parameter Supply Voltage Min 1.2 Typ -- Max 5.5 Units V Device Test Conditions Note 1
DC Electrical Characteristics: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. Parameter Low Level @ RESET RESET Output Current @ 0.4 Volts Operating Current Operating Current VCC Trip Point (TC1278/9-5) Min -- +8 -- -- -- -- 4.50 4.25 4.00 -- 3 Typ -- -- 0.9 -- -- 0.9 4.625 4.375 4.125 9 6 Max 0.4 -- 2.0 40 40 2.0 4.74 4.49 4.24 -- 9 Units V mA mA A A mA V V V pF k TC1278 TC1279 TC1278 TC1279 TC1278 TC1279 Test Conditions Note 1 Note 2 VCC > VCCTP(MAX) VCC > VCCTP(MAX) VCC < VCCTP(MIN) VCC < VCCTP(MIN) Note 1 Note 1 Note 1
VCCTP-10 VCC Trip Point (TC1278/9-10) VCCTP-15 VCC Trip Point (TC1278/9-15) COUT RP Symbol tRST tRPD1 tRPD2 tF tR tRPU1 tRPU2
Note 1: 2:
Output Capacitance Internal Pull-Up Resistor
AC Electrical Characteristics: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. Parameter RESET Active Time VCC Detect to RESET VCC Detect to RESET VCC Slew Rate (4.75V-4.00V) VCC Slew Rate (4.00V-4.75V) VCC Detect to RESET VCC Detect to RESET Min 250 -- -- 300 0 250 250 Typ 350 2 2 -- -- 350 350 Max 450 5 5 -- -- 450 450 Units msec sec TC1279 sec TC1278 sec nsec msec TC1279 msec TC1278 Figure 3-2 Figure 3-4 Figure 3-2, Figure 3-4 Figure 3-1, Figure 3-3 Figure 3-1 Figure 3-3 Test Conditions
All voltages referenced to ground. A 1k external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1279. VCC = 1.8V.
(c)
DS21384B-page 2
2002 Microchip Technology Inc.
TC1278/TC1279
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (3-Pin SOT-23B) 1
PIN FUNCTION TABLE
Symbol RESET (TC1279) Description RESET output remains low while VCC is below the reset voltage threshold, and for 350msec (250msec min.) after VCC rises above reset threshold. The output stage of the TC1279 is open drain. RESET output remains high while VCC is below the reset voltage threshold, and for 350msec (250msec min.) after VCC rises above reset threshold. The output stage of the TC1278 is open drain. Supply voltage (1.2V to 5.5V). Ground.
1
RESET (TC1278)
2 3
VCC GND
2002 Microchip Technology Inc.
DS21384B-page 3
(c)
TC1278/TC1279
3.0
3.1
APPLICATIONS INFORMATION
Operation - Power Monitor
FIGURE 3-3:
Timing Diagram - Power Up (TC1278)
tR
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 VCC is detected as out-of-tolerance, the RESET signal is asserted. On power-up, RESET is kept active for approximately 350msec after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RESET is released.
VCCTP(MAX) VCCTP(MIN) VCCTP
VCC tRPU2
FIGURE 3-1:
Timing Diagram - Power Up (TC1279)
RESET
tR
VOL
4.75V 4.00V VCCTP
FIGURE 3-4:
Timing Diagram - Power Down (TC1278)
tF
VCC tRPU1
VCC 4.74V VCCTP
VOH
4.00V
RESET
tRPD2
FIGURE 3-2:
Timing Diagram - Power Down (TC1279)
tF
VOH RESET SLEWS WITH VCC RESET
VCC 4.75V VCCTP 4.00V
tRPD1 RESET
VOL
(c)
DS21384B-page 4
2002 Microchip Technology Inc.
TC1278/TC1279
3.2 VCC Transient Rejection
FIGURE 3-5:
The TC1278/TC1279 provides accurate VCC monitoring and reset timing during power-up, power-down, and brownout/sag conditions, and rejects negativegoing 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.
MAXIMUM TRANSIENT DURATION (sec)
5
MAXIMUM TRANSIENT DURATION VS. OVERDRIVE FOR GLITCH REJECTION AT 25C
VCC VCCTP
Overdrive
Duration TA C
4
3
2 TC1278/9
1 0 1
5 1000 100 RESET COMPARATOR OVERDRIVE,
[VCCTP - VCC] (mV)
2002 Microchip Technology Inc.
DS21384B-page 5
(c)
TC1278/TC1279
4.0
4.1
PACKAGING INFORMATION
Package Marking Information
Part Number TC1278-5ENB TC1278-10ENB TC1278-15ENB TC1279-5ENB TC1279-10ENB TC1279-15ENB
3 4
Code PA PB PC RA RB RC
represents year and 2-month code represents production lot ID code
1
&
2
= part number code + temperature range and voltage
4.2
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
(c)
DS21384B-page 6
2002 Microchip Technology Inc.
TC1278/TC1279
4.3 Package Dimensions
3-Pin SOT-23B
.021 (0.54) .015 (0.37)
.104 (2.64) .083 (2.10)
.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) .007 (0.18) .003 (0.08)
.040 (1.02) .031 (0.79) .004 (0.10) .001 (0.02) .081 (2.05) .070 (1.78)
Dimensions: inches (mm)
2002 Microchip Technology Inc.
DS21384B-page 7
(c)
TC1278/TC1279
NOTES:
(c)
DS21384B-page 8
2002 Microchip Technology Inc.
TC1278/TC1279
Sales and Support
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 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.
DS21384B-page9
TC1278/TC1279
NOTES:
DS21384B-page10
2002 Microchip Technology Inc.
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 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.
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 Technology 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. (c) 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 (R) 8-bit MCUs, KEELOQ(R) 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.
2002 Microchip Technology Inc.
DS21384B-page 11
(c)
WORLDWIDE SALES AND SERVICE
AMERICAS
Corporate Office
2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com
ASIA/PACIFIC
Australia
Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755
Japan
Microchip Technology Japan K.K. Benex S-1 6F 3-18-20, Shinyokohama Kohoku-Ku, Yokohama-shi Kanagawa, 222-0033, Japan Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Rocky Mountain
2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456
China - Beijing
Microchip Technology Consulting (Shanghai) Co., Ltd., Beijing Liaison Office Unit 915 Bei Hai Wan Tai Bldg. No. 6 Chaoyangmen Beidajie Beijing, 100027, No. China Tel: 86-10-85282100 Fax: 86-10-85282104
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
Atlanta
500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 Fax: 770-640-0307
Singapore
Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-6334-8870 Fax: 65-6334-8850
Boston
2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821
China - Chengdu
Microchip Technology Consulting (Shanghai) Co., Ltd., Chengdu Liaison Office Rm. 2401, 24th Floor, Ming Xing Financial Tower No. 88 TIDU Street Chengdu 610016, China Tel: 86-28-86766200 Fax: 86-28-86766599
Taiwan
Microchip Technology Taiwan 11F-3, No. 207 Tung Hua North Road Taipei, 105, Taiwan Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
Chicago
333 Pierce Road, Suite 180 Itasca, IL 60143 Tel: 630-285-0071 Fax: 630-285-0075
Dallas
4570 Westgrove Drive, Suite 160 Addison, TX 75001 Tel: 972-818-7423 Fax: 972-818-2924
China - Fuzhou
Microchip Technology Consulting (Shanghai) Co., Ltd., Fuzhou Liaison Office Unit 28F, World Trade Plaza No. 71 Wusi Road Fuzhou 350001, China Tel: 86-591-7503506 Fax: 86-591-7503521
EUROPE
Denmark
Microchip Technology Nordic ApS Regus Business Centre Lautrup hoj 1-3 Ballerup DK-2750 Denmark Tel: 45 4420 9895 Fax: 45 4420 9910
Detroit
Tri-Atria Office Building 32255 Northwestern Highway, Suite 190 Farmington Hills, MI 48334 Tel: 248-538-2250 Fax: 248-538-2260
China - Shanghai
Microchip Technology Consulting (Shanghai) Co., Ltd. Room 701, Bldg. B Far East International Plaza No. 317 Xian Xia Road Shanghai, 200051 Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
Kokomo
2767 S. Albright Road Kokomo, Indiana 46902 Tel: 765-864-8360 Fax: 765-864-8387
France
Microchip Technology SARL Parc d'Activite du Moulin de Massy 43 Rue du Saule Trapu Batiment A - ler Etage 91300 Massy, France Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Los Angeles
18201 Von Karman, Suite 1090 Irvine, CA 92612 Tel: 949-263-1888 Fax: 949-263-1338
China - Shenzhen
Microchip Technology Consulting (Shanghai) Co., Ltd., Shenzhen Liaison Office Rm. 1315, 13/F, Shenzhen Kerry Centre, Renminnan Lu Shenzhen 518001, China Tel: 86-755-2350361 Fax: 86-755-2366086
New York
150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335
Germany
Microchip Technology GmbH Gustav-Heinemann Ring 125 D-81739 Munich, Germany Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
San Jose
Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408-436-7950 Fax: 408-436-7955
China - Hong Kong SAR
Microchip Technology Hongkong Ltd. Unit 901-6, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431
Italy
Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus 1 V. Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883
Toronto
6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509
India
Microchip Technology Inc. India Liaison Office Divyasree Chambers 1 Floor, Wing A (A3/A4) No. 11, O'Shaugnessey Road Bangalore, 560 025, India Tel: 91-80-2290061 Fax: 91-80-2290062
United Kingdom
Microchip Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820
05/01/02
(c)
DS21384B-page 12
2002 Microchip Technology Inc.

▲Up To Search▲

Price & Availability of TC1279-5ENB

	To Download TC1279-5ENB Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .