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M
Features
* * * * * * *
TC51
General Description
The TC51 is a very low power, open drain output, CMOS voltage detector with built-in delay. It is particularly well-suited for battery powered applications because of its extremely low 1A operating current and small surface-mount packaging. Each part is lasertrimmed to the desired threshold voltage, which can be specified from 1.6V to 6.0V. The standard built-in output delay is 50msec-200msec. The device includes a comparator, low-current highprecision reference, laser-programmed voltage divider, hysteresis circuit and output driver with digital delay timer. In operation, the TC51'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 immediately driven to a logic LOW. VOUT remains LOW until VIN rises above VDET by an amount VHYST, whereupon it returns to a logic HIGH after expiration of the built-in delay time.
1A Voltage Detector with Output Delay
Precise Detection Thresholds: 2.0% Small Package: 3-Pin SOT-23A Low Supply Current: Typ. 1A Wide Detection Range: 1.6V to 6.0V Wide Operating Voltage Range: 0.7V to 10V Built-in Delay Circuit: 50msec to 200 msec Open-Drain Output
Applications
* Battery Voltage Monitoring * Microprocessor Reset * System Brown-out Protection
Device Selection Table
Part Number TC51-xxxxxxxxxx Package Temp. Range
3-Pin SOT-23A -40C to +85C
Other output voltages are available. Please contact Microchip Technology Inc. for details.
Functional Block Diagram
VIN VOUT
Package Type
3-Pin SOT-23A
VIN 3
VREF
Delay Circuit
TC51
1 VOUT 2 VSS
VSS
NOTE: 3-Pin SOT-23A is equivalent to the EIAJ SC-59.
2002 Microchip Technology Inc.
DS21429B-page 1
TC51
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 ....................................................50mA Output Voltage: Open Drain ..........(VSS - 0.3V) to 12V Power Dissipation (TA 70C): 3-Pin SOT-23A ...........................................240mW Operating Temperature Range.............-40C to +85C Storage Temperature Range ..............-65C to +150C
TC51 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = 25C, unless otherwise specified. Symbol VIN ISS Parameter Operating Voltage Quiescent Current Min 0.7 -- -- -- -- -- VT x 0.98 VDET - x 0.02 -- -- Typ -- 0.9 1.0 1.3 1.6 2.0 VT 0.5% VDET - x 0.05 2.2 7.7 10.1 11.5 13.0 -- 100 Max 10.0 2.6 3.0 3.4 3.8 4.2 VT x 1.02 VDET - x 0.08 -- -- Units V
A
Test Conditions (VDET -) = 1.6 to 6.0V VIN = 1.5V VIN = 2.0V VIN = 3.0V VIN = 4.0V VIN = 5.0V Note 1 VOL = 0.5V, VIN = 1.0V VIN = 2.0V VIN = 3.0V VIN = 4.0V VIN = 5.0V Standard -40C TA 85C
VDET VHYST IOUT
Threshold Voltage Hysteresis Voltage Output Current
V V mA
TDLY TC (VDET -)
Note 1:
Delay Time Tempco of (VDET -)
50 --
200 --
msec ppm/C
VT is the factory programmed threshold voltage setting.
DS21429B-page 2
2002 Microchip Technology Inc.
TC51
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (3-Pin SOT-23A) 1 2 3
PIN FUNCTION TABLE
Symbol VOUT VSS VIN Description Digital output. This output goes low when VIN drops below VDET - and returns high when VIN rises above VDET - + VHYST. (See Figure 3-1, Timing Diagram). Ground terminal. Analog input. This pin is both the power supply input and the voltage to be monitored.
2002 Microchip Technology Inc.
DS21429B-page 3
TC51
3.0 DETAILED DESCRIPTION
In normal steady-state operation, when VIN > VDET -, the output is high, see Figure 3-1. If and when the input falls below VDET -, the output pulls down (Logic 0) to VSS. Generally, VOUT can pull down to within 0.5V of VSS at rated output current and input voltage. (Also see Section 1.0, Electrical Characteristics). The output, VOUT, stays 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, at which time the output becomes valid. VOUT is maintained in its active low state while VINMIN < VIN < VDET +. (VDET + = VDET - + VHYST). If and when the input rises above VDET +, the output will assume its inactive state after Delay Time (TDLY).
FIGURE 3-1:
TIMING DIAGRAM
VIN VDET+ VHYST Release Voltage
Detect Voltage VDETMinimum Operating Voltage Ground Level
VOUT
Output Voltage
Delay Time (TDLY)
Ground Level
DS21429B-page 4
2002 Microchip Technology Inc.
TC51
4.0
4.1
APPLICATIONS INFORMATION
Processor RESET Supervisor
FIGURE 4-1:
VDD
PROCESSOR RESET SUPERVISOR
Figure 4-1 shows the TC51 used as a processor reset supervisor. Because the TC51 is available in threshold settings of 1.6V to 6.0V, the user can choose the reset single threshold setting best suited to the system power supply voltage at hand. Also, the 1A supply current is significantly lower than its nearest competitor. As shown in the timing diagram (Figure 3-1),VOUT is low for voltages between 0.7V and VDET +. The TC51 activates its on-board delay timer once the power supply voltage is within tolerance (i.e., greater than VDET +). VOUT is released after delay time (TDLY). Should the power supply voltage momentarily dip ("brown-out" condition), the TC51 immediately drives and holds the processor RESET input low. RESET is released after the power supply voltage is again within tolerance, and after the delay timer expires. RESET is driven and held low when power fails (power-off or "blackout"), and is maintained down low to a supply voltage of 0.7V.
VDD R1 VOUT 47K RESET Processor
TC51
GND
FIGURE 4-2:
TC51 OPERATION DURING POWER-UP, BROWN-OUT AND POWER DOWN
Power-Up Brown-Out Steady State Operation Power Down
Nominal Power Supply Voltage
Threshold Voltage (VDET-, VDET+) 0.7V
Time VOH TC51 Output VOL TDLY TDLY
2002 Microchip Technology Inc.
DS21429B-page 5
TC51
5.0
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.
1. SUPPLY CURRENT VS. INPUT VOLTAGE TC51N1602
4.0 4.0
TC51N2502
4.0
TC51N3502
SUPPLY CURRENT ISS (A)
SUPPLY CURRENT ISS (A)
3.0
3.0
2.0 -30C TA = 80C 1.0 25C
2.0 TA = 80C 1.0 25C 0.0 -30C
SUPPLY CURRENT ISS (A)
3.0
2.0
TA = 80C -30C
1.0 25C 0.0
0.0 0 2 4 6 8 10 INPUT VOLTAGE VIN (V)
0
8 4 6 INPUT VOLTAGE VIN (V)
2
10
0
2 8 4 6 INPUT VOLTAGE VIN (V)
10
2. THRESHOLD VOLTAGE, HYSTERESIS VOLTAGE VS. AMBIENT TEMPERATURE TC51N1602
THRESHOLD HYSTERESIS VOLTAGE VDET- ,VHYST THRESHOLD HYSTERESIS VOLTAGE VDET- ,VHYST 1.8 2.8 2.7 VHYST 2.6 VDET- 2.5
TC51N2502
THRESHOLD HYSTERESIS VOLTAGE VDET- ,VHYST 3.8 3.7 3.6
TC51N3502
1.7
VHYST VDET-
VHYST
VDET- 3.5 3.4 3.3 3.2 -40
1.6
1.5
2.4
1.4 -40
-20 0 20 60 80 40 AMBIENT TEMPERATURE TA (C)
2.3 -40
-20 0 20 60 80 40 AMBIENT TEMPERATURE TA (C)
-20 0 20 60 40 80 AMBIENT TEMPERATURE TA (C)
3. OUTPUT VOLTAGE VS. INPUT VOLTAGE TC51N1602
3.0 OUTPUT VOLTAGE VOUT (V) VIN - VOUT: 100k TA = 30C = 25C 2.5 = 80C 2.0 1.5 1.0 0.5 0.0 0 2 INPUT VOLTAGE VIN (V) 1 3 4 OUTPUT VOLTAGE VOUT (V)
TC51N2502
VIN - VOUT: 100k TA = 30C = 25C = 80C 5 OUTPUT VOLTAGE VOUT (V) 4 3 2
TC51N3502
VIN - VOUT: 100k TA = 30C = 25C = 80C
3
2
1
1
0 0 1 2 3 4 INPUT VOLTAGE VIN (V)
0 0 1 2 3 4 5 INPUT VOLTAGE VIN (V)
DS21429B-page 6
2002 Microchip Technology Inc.
TC51
5.0 TYPICAL CHARACTERISTICS (CONTINUED)
4. OUTPUT CURRENT VS. VDS TC51N1602
15.0 OUTPUT CURRENT IOUT (mA) 12.5 10.0 7.5 5.0 1.0V 2.5 0.0 0.0 VIN = 1.5V TA = 25C OUTPUT CURRENT IOUT (A) 1400 1200 1000 800 600 400 200 0.5 1.0 VDS (V) 1.5 2.0 0 0.2 0.4 0.6 0.8 1.0 VDS (V) 0.7V TA = 25C VIN = 0.8V
TC51N1602
TC51N2502
30 OUTPUT CURRENT IOUT (mA) 25 20 15 1.5V 10 5 0 0.0 TA = 25C OUTPUT CURRENT IOUT (A) VIN = 2.0V 1200 1000 800 600 400 200 0 0.0 TA = 25C
TC51N2502
VIN = 0.8V
0.7V
0.5
1.0
1.5
2.0
2.5
0.2
0.4
0.6
0.8
1.0
VDS (V)
VDS (V)
TC51N3502
60 OUTPUT CURRENT IOUT (mA) 50 40 30 2.0V 20 1.5V 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 VDS (V) TA = 25C OUTPUT CURRENT IOUT (A) VIN = 3.0V 1400 1200 1000 800 TA = 25C
TC51N3502
VIN = 0.8V
2.5V
0.7V 600 400 200 0.0
0.2
0.4 0.6 VDS (V)
0.8
1.0
2002 Microchip Technology Inc.
DS21429B-page 7
TC51
5.0 TYPICAL CHARACTERISTICS (CONTINUED)
5. OUTPUT CURRENT VS. INPUT VOLTAGE TC51N1602
15.0 OUTPUT CURRENT IOUT (mA) 12.5 10.0 7.5 5.0 80C 2.5 0.0 0.0 25C VDS = 0.5V 25 OUTPUT CURRENT IOUT (mA) TA = 30C VDS = 0.5V TA = 30C 20
TC51N2502
15
25C
10
80C
5
0.5
1.0
1.5
2.0
0 0.0
0.5
INPUT VOLTAGE VIN (V)
1.0 1.5 2.0 2.5 INPUT VOLTAGE VIN (V)
3.0
TC51N3502
40 OUTPUT CURRENT IOUT (mA) 35 TA 30 25 20 15 10 5 0 0 1.0 2.0 3.0 INPUT VOLTAGE VIN (V) 4.0 80C 25C VDS = 0.5V C
DS21429B-page 8
2002 Microchip Technology Inc.
TC51
6.0
6.1
PACKAGING INFORMATION
Package Marking Information
2
represents first decimal of output voltage Symbol Voltage .0 .1 .2 .3 .4 .5 .6 .7 .8 .9
3
1
represents N-channel indication and integer part of output voltage Symbol K L M N P R S Output Nch Nch Nch Nch Nch Nch Nch Voltage 0. 1. 2. 3. 4. 5. 6.
0 1 2 3 4 5 6 7 8 9
3
represents delay time Symbol 5 Delay Time 50ms-200ms
4
represents assembly lot code
6.2
Taping Form
Component Taping Orientation for 3-Pin SOT-23A (EIAJ SC-59) 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-23A
8 mm
4 mm
3000
7 in
2002 Microchip Technology Inc.
DS21429B-page 9
TC51
6.3 Package Dimensions
SOT-23A-3
.020 (0.50) .012 (0.30)
.118 (3.00) .098 (2.50)
.071 (1.80) .055 (1.40)
PIN 1 .075 (1.90) REF. .122 (3.10) .106 (2.70) .051 (1.30) .035 (0.90) .006 (0.15) .000 (0.00)
10 MAX. .022 (0.55) .014 (0.35)
.010 (0.25) .004 (0.09)
Dimensions: inches (mm)
DS21429B-page 10
2002 Microchip Technology Inc.
TC51
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART CODE
Output Configuration: N = Open Drain Detected Voltage: Ex: 18 = 1.8V
TC51
N
18
0
2
E
CB
XX
Output Delay: 0 = 50msec-200msec (standard) Tolerance: 2 = 2% Temperature: E: -40C to +85C Package Type and Pin Count: CB: 3-Pin SOT-23A (equivalent to EIAJ SC-59) Taping Direction: TR: Standard Taping
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.
DS21429B-page11
TC51
NOTES:
DS21429B-page12
2002 Microchip Technology Inc.
TC51
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.
DS21429B-page 13
M
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' !& '
DS21429B-page 14
2002 Microchip Technology Inc.

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