View TC1277-5ENB_1321960.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Obsolete Device
TC1275/TC1276/TC1277
3-Pin Reset Monitors for 3.3V Systems
Features
* Precision VCC Monitor for 3.3V Systems * 100 ms Minimum RESET, RESET Output Duration * Output Valid to VCC = 1.2V * VCC Transient Immunity * Small 3-Pin SOT-23 Package * No External Components
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 20 s of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 100 ms 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-23 package.
Temp. Range
-40C to +85C -40C to +85C -40C to +85C
Applications
* * * * Computers Embedded Systems Battery Powered Equipment Critical P Power Supply Monitoring
Device Selection Table
Part Number
TC1275-xENB TC1276-xENB TC1277-xENB
Order
Complimentary Open-Drain Complimentary
Package
3-Pin SOT-23 3-Pin SOT-23 3-Pin SOT-23
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
NOTE: "x" denotes a suffix for VCC threshold (see table below).
Suffix 5 10 20
Reset VCC Threshold (V) 3.06 2.88 2.55
TC1275
GND 3 GND
Package Type
3-Pin SOT-23
RESET *(RESET)
1
TC1275 TC1276 TC1277
VCC 2
3
GND
*( ) is for TC1277
(c) 2007 Microchip Technology Inc.
DS21383C-page 1
TC1275/TC1276/TC1277
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 (VCC to GND) .............................+6.0V RESET, RESET.......................... -0.3V to (VCC + 0.3V) Input Current, VCC ..............................................20 mA Output Current, RESET, RESET ........................20 mA Power Dissipation (TA 70C) 3-Pin SOT-23 (derate 4 mW/C above +70C) ................................................................230 mW Operating Temperature Range.............-40C to +85C Storage Temperature Range ..............-65C to +150C
TC1275/TC1276/TC1277 ELECTRICAL SPECIFICATIONS
Recommended DC Operating Conditions: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. Symbol VCC Parameter Supply Voltage Min 1.2 1.8 Min Typ -- -- Typ Max 5.5 5.5 Max -- -- -- -- 35 35 700 3.15 2.97 2.64 -- 9.0 Max 300 50 50 -- -- 300 300 V V V pF k Units ms s s s ns ms ms TC1275, TC1276 VCC(LOW) = 1V, Figure 3-2 TC1277 VCC(LOW) = 1V, Figure 3-4 Figure 3-2, Figure 3-4 Figure 3-1, Figure 3-3 TC1275, TC1276 Note 4, Figure 3-1 TC1277 Note 4, Figure 3-3 TC1276 Test Conditions mA A -- -- -- 2.98 2.80 2.47 -- 3.0 Min 100 -- -- 300 0 100 100 20 20 350 3.06 2.88 2.55 9 6.0 Typ 200 20 20 -- -- 200 200 TC1275, TC1277 Note 3 Note 3 TC1276 Note 3 TC1276 Note 1 Note 1 Note 1 Units V Device Test Conditions TC1275, TC1276 Note 1 TC1277 Test Conditions TC1275, TC1277 Note 1 TC1275 TC1277 Note 2 Note 2, Note 5
DC Electrical Characteristics: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C. Symbol VOH IOH Parameter Output Voltage @ 0-500A Output Current @ 2.4 Volts VCC = 5V VCC = 2.7V Output Current @ 0.4 Volts Operating Current VCC < 5.5V VCCTP < VCC < 5.5V VCC < VCCTP VCC Trip Point (TC1275/6/7-5) Units V mA -- -- +10 13 1.3 30 VCC - 0.5V VCC - 0.1V
IOL ICC
VCCTP-5
VCCTP-10 VCC Trip Point (TC1275/6/7-10) VCCTP-20 VCC Trip Point (TC1275/6/7-20) COUT RP Symbol tRST tRPD1 tRPD2 tF tR tRPU1 tRPU2
Note 1: 2: 3: 4: 5:
Output Capacitance Internal Pull-Up Resistor Parameter RESET Active Time VCC Detect to RESET VCC Detect to RESET VCC Slew Rate (VCCTP(MAX) to VCCTP(MIN)) VCC Slew Rate (VCCTP(MIN) to VCCTP(MAX)) VCC Detect to RESET VCC Detect to RESET
AC Electrical Characteristics: TA = -40C to +85C unless otherwise noted. Typical values are at TA = +25C.
All voltages referenced to ground. Measured with VCC 2.7 volts. Measured with RESET output open for TC1275/TC1276; measured with RESET output open for TC1277. tR = 5 s. A 1 k external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1276.
DS21383C-page 2
(c) 2007 Microchip Technology Inc.
TC1275/TC1276/TC1277
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (3-Pin SOT-23)
PIN FUNCTION TABLE
Symbol Description
1
RESET (TC1275/ TC1276)
RESET
RESET output remains low while VCC is below the reset voltage threshold, and for 200 ms (100 ms minimum) after VCC rises above reset threshold. The output stage of the TC1275 is complimentary. The output stage of the TC1276 is opendrain. RESET output remains high while VCC is below the reset voltage threshold, and for 200 ms (100 ms minimum) after VCC rises above reset threshold. The output stage of the TC1277 is complimentary. Supply voltage (1.2V to 5.5V TC1275 and TC1276, 1.8V to 5.5V TC1277).
Ground.
1
(TC1277) VCC GND
2 3
(c) 2007 Microchip Technology Inc.
DS21383C-page 3
TC1275/TC1276/TC1277
3.0
3.1
APPLICATIONS INFORMATION
Operation - Power Monitor
tR
The TC1275/TC1276/TC1277 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-oftolerance, the RESET signal is asserted. On power-up, RESET is kept active for approximately 200 ms 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
tR
RESET
VOL
VCCTP(MAX) VCCTP(MIN) VCCTP
FIGURE 3-3: Timing Diagram - Power Up (TC1277).
tF VCC
VCC tRPU1
VCCTP(MAX) VCCTP
VOH
VCCTP(MIN)
RESET
FIGURE 3-1: Timing Diagram - Power Up (TC1275/TC1276).
tF VCC VCCTP(MAX) VCCTP VCCTP(MIN)
RESET VOH
tRPD2
RESET SLEWS WITH VCC
FIGURE 3-4: Timing Diagram - Power Down (TC1277).
tRPD1 RESET
VOL
FIGURE 3-2: Timing Diagram - Power Down (TC1275/TC1276).
DS21383C-page 4
(c) 2007 Microchip Technology Inc.
TC1275/TC1276/TC1277
3.2 VCC Transient Rejection
The TC1275/TC1276/TC1277 provides accurate VCC monitoring and reset timing during power-up, powerdown, 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.
VCC VTH Overdrive
Duration MAXIMUM TRANSIENT DURATION (sec) 500 TA 400 C
3.3
RESET Signal Integrity During Power-Down
300
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 P will be floating at an undetermined voltage. Most digital systems are completely shut down well above this voltage. However, in situations 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 (100 k will 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.
200 TC1275/6/7
100 0 1
10 1000 100 RESET COMPARATOR OVERDRIVE, [VCCTP - VCC] (mV)
FIGURE 3-5: Maximum Transient Duration Vs. Overdrive For Glitch Rejection At +25C.
VCC
VCC
TC1275
RESET R1 100k
GND
FIGURE 3-6: TO VCC = 0V.
ENSURING RESET VALID
(c) 2007 Microchip Technology Inc.
DS21383C-page 5
TC1275/TC1276/TC1277
4.0
Note:
TYPICAL CHARACTERISTICS
The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
VCC Detect To RESET (RESET)
VCC TO RESET DELAY (sec) TA = 25C 100000 V 10000
VCC TO RESET DELAY (sec) 300
Reset Delays vs. Comparator Overdrive
TA = 25C
200
1000
= 2V
100
100
10
1
10
100
1000
10000
100000
0 0 1 2 3 4 5 COMPARATOR OVERDRIVE (V)
VCC SLEW RATE (V/sec)
DS21383C-page 6
(c) 2007 Microchip Technology Inc.
TC1275/TC1276/TC1277
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
1
&
2
= part number code + temperature range and voltage Code DA DB DC Code EA EB EC Code FA FB FC
DA
TC1275 (V) 2.55 2.88 3.06 TC1276 (V) 2.55 2.88 3.06 TC1277 (V) 2.55 2.88 3.06 ex: 1275-20 =
3 4
represents year and quarter code represents production lot ID code
(c) 2007 Microchip Technology Inc.
DS21383C-page 7
TC1275/TC1276/TC1277
3-Lead Plastic Small Outline Transistor (TT or NB) [SOT-23]
Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging
b N E E1
1 e e1 D
2
A
c A2
A1
Units Dimension Limits Number of Pins Lead Pitch Outside Lead Pitch Overall Height Molded Package Thickness Standoff Overall Width Molded Package Width Overall Length Foot Length Foot Angle Lead Thickness N e e1 A A2 A1 E E1 D L c 0.89 0.79 0.01 2.10 1.16 2.67 0.13 0 0.08 MIN MILLIMETERS NOM 3 0.95 BSC 1.90 BSC - 0.95 - - 1.30 2.90 0.50 - -
L
MAX
1.12 1.02 0.10 2.64 1.40 3.05 0.60 10 0.20
Lead Width b 0.30 - 0.54 Notes: 1. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.25 mm per side. 2. Dimensioning and tolerancing per ASME Y14.5M. BSC: Basic Dimension. Theoretically exact value shown without tolerances. Microchip Technology Drawing C04-104B
DS21383C-page 8
(c) 2007 Microchip Technology Inc.
TC1275/TC1276/TC1277
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device XX Reset VCC Threshold X Temperature Range /XX Package Examples:
a) b) c)
Device: TC1275: TC1276: TC1277: 5 10 15 E 3-Pin Reset Monitor - Complementary 3-Pin Reset Monitor - Open-Drain 3-Pin Reset Monitor - Complementary TC1275-10ENBTR: TC1275-15ENBTR: TC1275-5ENBTR: TC1276-10ENBTR: TC1276-15ENBTR: TC1276-5ENBTR: TC1277-10ENBTR: TC1277-15ENBTR: TC1277-5ENBTR:
2.88V Reset Monitor 2.55V Reset Monitor 3.06V Reset Monitor 2.88V Reset Monitor 2.55V Reset Monitor 3.06V Reset Monitor 2.88V Reset Monitor 2.55V Reset Monitor 3.06V Reset Monitor
a) b) c) a) b) c)
Reset VCC Threshold Voltage
= 3.06V = 2.88V = 2.55V = -40C to +85C
Temperature Range: Package:
NB = Plastic Small Outline Transistor (SOT-23), 3-lead
(c) 2007 Microchip Technology Inc.
DS21383C-page9
TC1275/TC1276/TC1277
NOTES:
DS21383C-page 10
(c) 2007 Microchip Technology Inc.
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 provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, KEELOQ logo, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, Linear Active Thermistor, Migratable Memory, MXDEV, MXLAB, PS logo, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. 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) 2007, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona, Gresham, Oregon and Mountain View, California. The Company's quality system processes and procedures are for its PIC(R) MCUs and dsPIC(R) DSCs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001:2000 certified.
(c) 2007 Microchip Technology Inc.
DS21383C-page 11
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: http://support.microchip.com Web Address: www.microchip.com Atlanta Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455 Boston Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088 Chicago Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075 Dallas Addison, TX Tel: 972-818-7423 Fax: 972-818-2924 Detroit Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260 Kokomo Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387 Los Angeles Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608 Santa Clara Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445 Toronto Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509
ASIA/PACIFIC
Asia Pacific Office Suites 3707-14, 37th Floor Tower 6, The Gateway Habour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 Australia - Sydney Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 China - Beijing Tel: 86-10-8528-2100 Fax: 86-10-8528-2104 China - Chengdu Tel: 86-28-8665-5511 Fax: 86-28-8665-7889 China - Fuzhou Tel: 86-591-8750-3506 Fax: 86-591-8750-3521 China - Hong Kong SAR Tel: 852-2401-1200 Fax: 852-2401-3431 China - Qingdao Tel: 86-532-8502-7355 Fax: 86-532-8502-7205 China - Shanghai Tel: 86-21-5407-5533 Fax: 86-21-5407-5066 China - Shenyang Tel: 86-24-2334-2829 Fax: 86-24-2334-2393 China - Shenzhen Tel: 86-755-8203-2660 Fax: 86-755-8203-1760 China - Shunde Tel: 86-757-2839-5507 Fax: 86-757-2839-5571 China - Wuhan Tel: 86-27-5980-5300 Fax: 86-27-5980-5118 China - Xian Tel: 86-29-8833-7250 Fax: 86-29-8833-7256
ASIA/PACIFIC
India - Bangalore Tel: 91-80-4182-8400 Fax: 91-80-4182-8422 India - New Delhi Tel: 91-11-4160-8631 Fax: 91-11-4160-8632 India - Pune Tel: 91-20-2566-1512 Fax: 91-20-2566-1513 Japan - Yokohama Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Korea - Gumi Tel: 82-54-473-4301 Fax: 82-54-473-4302 Korea - Seoul Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934 Malaysia - Penang Tel: 60-4-646-8870 Fax: 60-4-646-5086 Philippines - Manila Tel: 63-2-634-9065 Fax: 63-2-634-9069 Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan - Hsin Chu Tel: 886-3-572-9526 Fax: 886-3-572-6459 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350
EUROPE
Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Germany - Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 Italy - Milan Tel: 39-0331-742611 Fax: 39-0331-466781 Netherlands - Drunen Tel: 31-416-690399 Fax: 31-416-690340 Spain - Madrid Tel: 34-91-708-08-90 Fax: 34-91-708-08-91 UK - Wokingham Tel: 44-118-921-5869 Fax: 44-118-921-5820
12/08/06
DS21383C-page 12
(c) 2007 Microchip Technology Inc.

▲Up To Search▲

Price & Availability of TC1277-5ENB

	To Download TC1277-5ENB Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .