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TC54
Voltage Detector
Features
* 2.0% Detection Thresholds * Small Packages: 3-Pin SOT-23A, 3-Pin SOT-89, and TO-92 * Low Current Drain: 1 A (Typical) * Wide Detection Range: 1.1V to 6.0V * Wide Operating Voltage Range: 0.7V to 10V
General Description
The TC54 series are CMOS voltage detectors that are especially well suited for battery-powered applications because of their extremely low 1 A operating current and small surface-mount packaging. Each part is lasertrimmed to the desired threshold voltage, which can be specified from 1.4V to 6.0V with a 2% tolerance. The TC54 is available with either an open-drain or complementary output stage. During operation, the TC54's output (VOUT) remains in the logic-high state as long as VIN is greater than the specified threshold voltage (VDET -). When VIN falls below VDET -, the output is driven to a logic-low. VOUT remains low until VIN rises above VDET - by an amount VHYST, whereupon it resets to a logic-high.
Applications
* * * * * Battery Voltage Monitoring Microprocessor Reset System Brown-Out Protection Switching Circuit in Battery Backup Level Discriminator
Package Types
TC54VC only 3-Pin SOT-23A VIN 3 3-Pin SOT-89 VIN
Functional Block Diagram
VIN VOUT
TC54 TC54
1 VOUT 2 VSS 2 3 VOUT VIN VSS 3-Pin TO-92 123 1 - +
VREF
VSS
TC54VN has open-drain output. TC54VC has complementary(push-pull) output. VOUT VIN VSS Note: 3-Pin SOT-23A is equivalent to the EIAJ SC-59
Device Features
Output Device Type TC54VN TC54VC Note 1: Open-Drain Push-Pull State Active Low Active Low No No 1.4V, 2.1V, 2.7V, 2.9V 3.0V, 4.2V, 4.3V Reset Delay Std. Trip Points(1) (typical)
Custom Trip Points available. Minimum order requirement. Information available upon request.
(c) 2007 Microchip Technology Inc.
DS21434H-page 1
TC54
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
Input Voltage ...................................................................+12V Output Current ..............................................................50 mA Output Voltage: CMOS................(VSS - 0.3V) to (VIN + 0.3V) Open-Drain.....................(VSS - 0.3V) to 12V Power Dissipation (TA 70C): 3-Pin SOT-23A .......................................................240 mW 3-Pin SOT-89..........................................................500 mW 5-Pin SOT-23A .......................................................240 mW 3-Pin TO-92 ............................................................300 mW Operating Temperature Range........................-40C to +85C Storage Temperature Range .........................-65C to +150C
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, TA = +25C. Parameter Operating Voltage Quiescent Current Sym VIN ISS Min 0.7 0.7 -- -- -- -- Threshold Voltage (Note 1) VDET - 1.37 2.06 2.65 2.84 2.94 4.12 4.21 Hysteresis Voltage VHYST 28 42 54 58 60 84 86 Output Current IOUT 3.0 5.0 6.0 7.0 -- Tempco of (VDET-) Delay Time Note 1: TC (VDET -) tDLY -- -- Typ -- -- 0.8 0.9 1.0 1.1 1.4 2.1 2.7 2.9 3.0 4.2 4.3 70 105 135 145 150 210 215 7.7 10.1 11.5 13.0 -10.0 100 -- Max 10.0 6.0 2.7 3.0 3.2 3.6 1.43 2.14 2.75 2.96 3.06 4.28 4.39 112 168 216 232 240 336 344 -- -- -- -- -2.0 -- 0.2 mA mV V Units V V A Test Conditions (VDET -) 1.6V (VDET -) < 1.6V VIN = 2.0V VIN = 3.0V VIN = 4.0V VIN = 5.0V TC54VX14 TC54VX21 TC54VX27 TC54VX29 TC54VX30 TC54VX42 TC54VX43 VDET = 1.4V (typical) VDET = 2.1V (typical) VDET = 2.7V (typical) VDET = 2.9V (typical) VDET = 3.0V (typical) VDET = 4.2V (typical) VDET = 4.3V (typical) VOL = 0.5V, VIN = 2.0V VOL = 0.5V, VIN = 3.0V VOL = 0.5V, VIN = 4.0V VOL = 0.5V, VIN = 5.0V TC54VC Only: VOH = VIN - 2.1V, VIN = 8.0V ppm/C -40C TA 85C ms VDET - VOUT inversion
For other voltage options, please contact your regional Microchip sales office.
DS21434H-page 2
(c) 2007 Microchip Technology Inc.
TC54
VDET -+VHYST VDET VDD tDLY VOH
OUTPUT
FIGURE 1-1:
Timing Diagram.
(c) 2007 Microchip Technology Inc.
DS21434H-page 3
TC54
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No. (3-Pin SOT-89) 1 2 3 Tab Pin No. (3-Pin TO-92) 1 2 3 -- Symbol VOUT VIN VSS VIN Description Digital Output Analog Input Ground Terminal Analog Input
Pin No. (3-Pin SOT-23A) 1 3 2 --
2.1
Digital Output (VOUT)
2.3
Ground Terminal (VSS)
VOUT goes low when VIN drops below VDET - and returns high when VIN rises above VDET - + VHYST. (See Figure 3-1).
VSS provides the negative reference for the analog input voltage. Typically, the circuit ground is used.
2.4 2.2 Analog Input (VIN)
VIN can be used for power supply monitoring or a voltage level that requires monitoring.
No Connect (NC)
No internal connection.
DS21434H-page 4
(c) 2007 Microchip Technology Inc.
TC54
3.0 DETAILED DESCRIPTION
In normal steady-state operation when VIN > VDET -, the output will be at a logic-high (see Figure 3-1). In the case of the TC54VN, this is an open-drain condition. If the input falls below VDET -, the output will pull down (Logic 0) to VSS. Generally, VOUT can pull down to within 0.5V of VSS at rated output current and input voltage. (See Section 1.0 "Electrical Characteristics"). The output (VOUT) will stay valid until the input voltage falls below the minimum operating voltage (VINMIN) of 0.7V. Below this minimum operating voltage the output is undefined. During power-up (or anytime VIN has fallen below VINMIN), VOUT will remain undefined until VIN rises above VINMIN. Once this occurs, the output will become valid. VOUT will be in its active-low state, while VINMIN < VIN < VDET+ (therefore, VDET + = VDET - + VHYST). If the input rises above VDET+, the output will assume its inactive state (high for TC54VC, open-drain for TC54VN).
VIN
VDET + VHYST Release Voltage or RESET Voltage
Detect Voltage VDET - Minimum Operating Voltage Ground Level
VOUT
Output Voltage
Ground Level
FIGURE 3-1:
Timing Diagram.
(c) 2007 Microchip Technology Inc.
DS21434H-page 5
TC54
4.0
4.1
APPLICATIONS INFORMATION
Modifying the Trip Point, VDET -
4.2
Other Applications
Although the TC54 has a pre-programmed VDET -, it is sometimes necessary to make adjustments during prototyping. This can be accomplished by connecting an external resistor divider to a TC54, which has a VDET - lower than that of VSOURCE (Figure 4-1). To maintain detector accuracy, the bleeder current through the divider should be significantly higher than the 1 A operating current required by the TC54. A reasonable value for this bleeder current is 100 A (100 times the 1 A required by the TC54). For example, if VDET - = 2V and the desired trip point is 2.5V, the value of R1 + R2 is 25 k (2.5V/100 A). The value of R1 + R2 can be rounded to the nearest standard value and plugged into the equation of Figure 4-1 to calculate values for R1 and R2. 1% tolerance resistors are recommended. VSOURCE
Low operating power and small physical size make the TC54 series ideal for many voltage detector applications, such as those shown in Figures 4-2, 4-3 and 4-4. Figure 4-2 shows a low-voltage gate drive protection circuit that prevents overheating of the logiclevel MOSFET due to insufficient gate voltage. When the input signal is below the threshold of the TC54VN, its output grounds the gate of the MOSFET. Figure 4-3 and Figure 4-4 show the TC54 in conventional voltage monitoring applications.
4.3V 270 VIN VOUT VCC RL MTP3055EL
TC54VX
VSS
R2 VIN
TC54
VOUT
FIGURE 4-2: Protection.
MOSFET Low Drive
R1
VSS
+ VIN -
TC54VX
R1 V SOURCE = ------------------- = V DET R1 + R2 Where: VSOURCE VDET - Note: = = Voltage to be monitored Threshold Voltage setting of TC54 VOUT VSS
BATLOW
FIGURE 4-3:
Battery Voltage Monitor.
In this example, VSOURCE must be greater than (VDET -) VIN + Pwr Sply - VSS VOUT Power Good
FIGURE 4-1: Modify Trip-point of the TC54 using External Resistor Divider.
TC54VX
FIGURE 4-4:
Power Good Monitor.
DS21434H-page 6
(c) 2007 Microchip Technology Inc.
TC54
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
3-Pin SOT-23A 3-Pin SOT-89 3-Pin TO-92
2 1 2 3 4 1
4
1234
3
5678
1 , 2 ,& 3 1
= 54X (fixed)
represents output configuration (CMOS or Nch) and first integer of voltage Ex: CMOS 3.x = Symbol B C D E F H I Symbol L M N P R S T
D
4
represents output configuration (CMOS or Nch) Ex: CMOS 3.x = C Symbol C N Output CMOS N-Channel
Output CMOS CMOS CMOS CMOS CMOS CMOS CMOS Output Nch Nch Nch Nch Nch Nch Nch
Voltage 1. 2. 3. 4. 5. 6. 7. Voltage 1. 2. 3. 4. 5. 6. 7.
6 5
represents first integer of detect voltage Symbol 2 3 4 5 6 Voltage 2. 3. 4. 5. 6.
represents first decimal of detect voltage Symbol 0 1 2 3 4 Voltage .0 .1 .2 .3 .4 Symbol 5 6 7 8 9 Voltage .5 .6 .7 .8 .9
2
represents first decimal of output voltage (0-9) Ex: CMOS 3.x = Symbol 0 1 2 3 4 5
D4
Voltage .0 .1 .2 .3 .4 .5
Symbol 6 7 8 9
Voltage .6 .7 .8 .9
7
represents the output Delay Time Symbol 0 Delay Time No Delay
8
represents the device accuracy Symbol 1 2 Accuracy 1.0% (custom) 2.0% (standard)
)
3
&
4
represents assembly lot code
(c) 2007 Microchip Technology Inc.
DS21434H-page 7
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DS21434H-page 8
(c) 2007 Microchip Technology Inc.
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(c) 2007 Microchip Technology Inc.
DS21434H-page 9
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DS21434H-page 10
(c) 2007 Microchip Technology Inc.
TC54
APPENDIX A: REVISION HISTORY
Revision H (December 2007)
* Updated Features section. * Removed 5-Pin SOT-23 related information. * Updated Output Current (IOUT) Electrical Specification. * Removed 7.7V (typical) Voltage Trip Point Option. Max Trip Point Voltage is now 6.0V. * Updated Pin Function Table. * Updated Packaging Specification Information. * Added Revision History section. * Updated Product Identification System page.
Revision G (August 2004)
* Undocumented changes.
Revision F (July 2004)
* Undocumented changes.
Revision E (April 2003)
* Undocumented changes.
Revision D (October 2002)
* Undocumented changes.
Revision C (July 2002)
* Undocumented changes.
Revision B (May 2002)
* Undocumented changes.
Revision A (March 2001)
* Original Release of this Document.
(c) 2007 Microchip Technology Inc.
DS21434H-page 11
TC54
NOTES:
DS21434H-page 12
(c) 2007 Microchip Technology Inc.
TC54
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 X XX X X X XX XX Examples: a) TC54VC1402ECB713: Tape and Reel, 1.4V Voltage Detector, 2% Tol., SOT-23A-3. TC54VC1402EMB713: Tape and Reel, 1.4V Voltage Detector, 2% Tol., SOT-89-3. TC54VC1402EZB: 1.4V Voltage Detector, 2% Tol., TO-92. TC54VC2102ECB713: Tape and Reel, 2.1V Voltage Detector, 2% Tol., SOT-23A-3. TC54VC2102EMB713: Tape and Reel, 2.1V Voltage Detector, 2% Tol., SOT-89-3. TC54VC2102EZB: 2.1V Voltage Detector, 2% Tol., TO-92. TC54VC2702ECB713: Tape and Reel, 2.7V Voltage Detector, 2% Tol., SOT-23A-3. TC54VC3002ECB713: Tape and Reel, 3.0V Voltage Detector, 2% Tol., SOT-23A-3. TC54VN4202ECB713: Tape and Reel, 4.2V Voltage Detector,2% Tol., SOT-23A-3.
Output Detected Extra Tolerance Temp. Pkg Taping Config. Voltage Feature Direction Code
TC54V: Voltage Detector
Device:
b)
Output Configuration:
N C
= Nch Open-Drain = CMOS Output
c)
Detected Voltage: 14 21 27 29 30 42 43 = = = = = = = 1.4V 2.1V 2.7V 2.9V 3.0V 4.2V 4.3V
d)
e)
Extra Feature Code: 0 = Fixed
Tolerance:
2
= 2%
f)
Temperature:
E
= -40C to +85C
g)
Package: CB = Plastic Small Outline Transistor, SOT-23A, 3-lead, MB = Plastic Small Outline Transistor, SOT-89, 3-lead, ZB = Plastic Transistor Outline, TO-92, 3-lead
h)
Taping Direction:
713 = Standard Taping
i)
(c) 2007 Microchip Technology Inc.
DS21434H-page 13
TC54
NOTES:
DS21434H-page 14
(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, 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, 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, dsSPEAK, 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, 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 design centers in California and India. 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.
DS21434H-page 15
WORLDWIDE SALES AND SERVICE
AMERICAS
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EUROPE
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10/05/07
DS21434H-page 16
(c) 2007 Microchip Technology Inc.

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