MICROCHIP TC51

M
TC51
1µA Voltage Detector with Output Delay
Features
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 1µA 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.
Precise Detection Thresholds: ±2.0%
Small Package: 3-Pin SOT-23A
Low Supply Current: Typ. 1µA
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
The device includes a comparator, low-current highprecision reference, laser-programmed voltage divider,
hysteresis circuit and output driver with digital delay
timer.
Applications
• Battery Voltage Monitoring
• Microprocessor Reset
• System Brown-out Protection
Device Selection Table
Part Number
Package
TC51-xxxxxxxxxx
Temp. Range
3-Pin SOT-23A -40°C to +85°C
Other output voltages are available. Please contact Microchip
Technology Inc. for details.
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.
Functional Block Diagram
VIN
Package Type
VOUT
3-Pin SOT-23A
VIN
Delay
Circuit
3
VREF
TC51
VSS
1
2
VOUT
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 ≤ 70°C):
3-Pin SOT-23A ...........................................240mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range ..............-65°C to +150°C
TC51 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = 25°C, unless otherwise specified.
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
VIN
Operating Voltage
0.7
—
10.0
V
(VDET -) = 1.6 to 6.0V
ISS
Quiescent Current
—
—
—
—
—
0.9
1.0
1.3
1.6
2.0
2.6
3.0
3.4
3.8
4.2
µA
VIN = 1.5V
VIN = 2.0V
VIN = 3.0V
VIN = 4.0V
VIN = 5.0V
VDET -
Threshold Voltage
VT x 0.98
VT ± 0.5%
VT x 1.02
V
Note 1
VHYST
Hysteresis Voltage
VDET - x 0.02
VDET - x 0.05
VDET - x 0.08
V
IOUT
Output Current
—
—
2.2
7.7
10.1
11.5
13.0
—
—
mA
TDLY
Delay Time
50
—
200
msec
TC (VDET -)
Tempco of (VDET -)
—
±100
—
ppm/°C
Note
1:
VOL = 0.5V, VIN = 1.0V
VIN = 2.0V
VIN = 3.0V
VIN = 4.0V
VIN = 5.0V
Standard
-40°C ≤ TA ≤ 85°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 FUNCTION TABLE
Pin No.
(3-Pin SOT-23A)
Symbol
1
VOUT
2
VSS
Ground terminal.
3
VIN
Analog input. This pin is both the power supply input and the voltage to be monitored.
 2002 Microchip Technology Inc.
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).
DS21429B-page 3
TC51
3.0
DETAILED DESCRIPTION
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).
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).
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
APPLICATIONS INFORMATION
4.1
Processor RESET Supervisor
FIGURE 4-1:
VDD
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 1µA supply current is
significantly lower than its nearest competitor.
VDD
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).
R1
VOUT
Processor
47K
RESET
TC51
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.
FIGURE 4-2:
PROCESSOR RESET
SUPERVISOR
GND
TC51 OPERATION DURING POWER-UP, BROWN-OUT AND POWER DOWN
Power-Up
Nominal
Power Supply
Voltage
Brown-Out
Steady
State
Operation
Power Down
Threshold
Voltage
(VDET-, VDET+)
0.7V
Time
VOH
TC51 Output
VOL
 2002 Microchip Technology Inc.
TDLY
TDLY
DS21429B-page 5
TC51
5.0
TYPICAL CHARACTERISTICS
Note:
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
TC51N2502
TC51N1602
4.0
SUPPLY CURRENT ISS (µA)
SUPPLY CURRENT ISS (µA)
SUPPLY CURRENT ISS (µA)
TC51N3502
4.0
4.0
3.0
3.0
2.0
-30°C
TA = 80°C
25°C
1.0
3.0
2.0
-30°C
TA = 80°C
1.0
25°C
0.0
0.0
0
2
4
6
8
TA = 80°C
-30°C
1.0
25°C
0.0
0
10
2.0
INPUT VOLTAGE VIN (V)
2
8
4
6
INPUT VOLTAGE VIN (V)
0
10
2
8
4
6
INPUT VOLTAGE VIN (V)
10
2. THRESHOLD VOLTAGE, HYSTERESIS VOLTAGE VS. AMBIENT TEMPERATURE
1.7
VHYST
VDET–
1.6
1.5
1.4
-40
-20
0
20
60
80
40
AMBIENT TEMPERATURE TA (°C)
TC51N3502
2.8
2.7
VHYST
2.6
VDET–
2.5
2.4
2.3
-40
-20
0
20
60
80
40
AMBIENT TEMPERATURE TA (°C)
THRESHOLD HYSTERESIS VOLTAGE VDET– ,VHYST
TC51N2502
THRESHOLD HYSTERESIS VOLTAGE VDET– ,VHYST
THRESHOLD HYSTERESIS VOLTAGE VDET– ,VHYST
TC51N1602
1.8
3.8
3.7
VHYST
3.6
VDET–
3.5
3.4
3.3
3.2
-40
-20
0
20
60
40
80
AMBIENT TEMPERATURE TA (°C)
3. OUTPUT VOLTAGE VS. INPUT VOLTAGE
TC51N1602
TC51N2502
4
2.0
1.5
1.0
0.5
0.0
TC51N3502
5
VIN – VOUT: 100k
TA = 30°C
= 25°C
= 80°C
3
OUTPUT VOLTAGE VOUT (V)
VIN – VOUT: 100k
TA = 30°C
= 25°C
= 80°C
2.5
OUTPUT VOLTAGE VOUT (V)
OUTPUT VOLTAGE VOUT (V)
3.0
2
1
DS21429B-page 6
1
2
INPUT VOLTAGE VIN (V)
3
4
3
2
1
0
0
0
VIN – VOUT: 100k
TA = 30°C
= 25°C
= 80°C
0
1
2
3
INPUT VOLTAGE VIN (V)
4
0
1
2
3
4
5
INPUT VOLTAGE VIN (V)
 2002 Microchip Technology Inc.
TC51
5.0
TYPICAL CHARACTERISTICS (CONTINUED)
4. OUTPUT CURRENT VS. VDS
TC51N1602
TC51N1602
1400
TA = 25°C
OUTPUT CURRENT IOUT (µA)
OUTPUT CURRENT IOUT (mA)
15.0
12.5
VIN = 1.5V
10.0
7.5
5.0
1.0V
2.5
TA = 25°C
VIN = 0.8V
1200
1000
0.7V
800
600
400
200
0.0
0.0
0.5
1.0
1.5
0
2.0
0.2
TC51N2502
TA = 25°C
25
VIN = 2.0V
20
15
1.5V
10
5
0
0.0
0.5
1.0
1.5
2.0
800
600
200
0
0.0
2.5
0.7V
400
0.2
2.5V
30
2.0V
20
1.5V
10
0
1.0
1.5
2.0
VDS (V)
 2002 Microchip Technology Inc.
2.5
3.0 3.5
OUTPUT CURRENT IOUT (µA)
OUTPUT CURRENT IOUT (mA)
VIN = 3.0V
0.5
0.6
0.8
1.0
TC51N3502
TA = 25°C
0
0.4
VDS (V)
1400
40
1.0
VIN = 0.8V
1000
TC51N3502
50
0.8
TA = 25°C
VDS (V)
60
0.6
TC51N2502
1200
OUTPUT CURRENT IOUT (µA)
OUTPUT CURRENT IOUT (mA)
30
0.4
VDS (V)
VDS (V)
TA = 25°C
VIN = 0.8V
1200
1000
800
0.7V
600
400
200
0.0
0.2
0.4
0.6
VDS (V)
0.8
1.0
DS21429B-page 7
TC51
5.0
TYPICAL CHARACTERISTICS (CONTINUED)
5. OUTPUT CURRENT VS. INPUT VOLTAGE
TC51N1602
TC51N2502
25
VDS = 0.5V
VDS = 0.5V
TA = 30°C
OUTPUT CURRENT IOUT (mA)
OUTPUT CURRENT IOUT (mA)
15.0
12.5
25°C
10.0
7.5
5.0
80°C
2.5
0.0
0.0
0.5
1.0
1.5
2.0
INPUT VOLTAGE VIN (V)
TA = 30°C
20
15
25°C
10
80°C
5
0
0.0
0.5
1.0
1.5 2.0
2.5
INPUT VOLTAGE VIN (V)
3.0
TC51N3502
OUTPUT CURRENT IOUT (mA)
40
VDS = 0.5V
35
TA
°C
30
25°C
25
20
15
80°C
10
5
0
0
DS21429B-page 8
1.0
2.0
3.0
INPUT VOLTAGE VIN (V)
4.0
 2002 Microchip Technology Inc.
TC51
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
2
represents first decimal of output voltage
Symbol
Voltage
0
1
2
3
4
5
6
7
8
9
.0
.1
.2
.3
.4
.5
.6
.7
.8
.9
3
1
represents N-channel indication and integer part
of output voltage
Symbol
Output
Voltage
K
L
M
N
P
R
S
Nch
Nch
Nch
Nch
Nch
Nch
Nch
0.
1.
2.
3.
4.
5.
6.
3
4
6.2
represents delay time
Symbol
Delay Time
5
50ms-200ms
represents assembly lot code
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
3-Pin SOT-23A
 2002 Microchip Technology Inc.
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8 mm
4 mm
3000
7 in
DS21429B-page 9
TC51
6.3
Package Dimensions
SOT-23A-3
.020 (0.50)
.012 (0.30)
.071 (1.80)
.055 (1.40)
.118 (3.00)
.098 (2.50)
PIN 1
.075 (1.90)
REF.
.122 (3.10)
.106 (2.70)
.051 (1.30)
.035 (0.90)
.010 (0.25)
.004 (0.09)
10° MAX.
.006 (0.15)
.000 (0.00)
.022 (0.55)
.014 (0.35)
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
TC51
N
18
0
2
E
CB
XX
Output Configuration:
N = Open Drain
Detected Voltage:
Ex: 18 = 1.8V
Output Delay:
0 = 50msec-200msec (standard)
Tolerance:
2 = ±2%
Temperature:
E: -40°C to +85°C
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.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
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and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
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non-volatile memory and analog products. In
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 2002 Microchip Technology Inc.
DS21429B-page 13
M
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05/01/02
'!&'
DS21429B-page 14
 2002 Microchip Technology Inc.