2002 Microchip Technology Inc. DS21429B-page 1
MTC51
Features
• 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
Applications
• Battery Voltage Monitoring
• Microprocessor Reset
• System Brown-out Protection
Device Selection Table
Other output voltages are available. Please contact Microchip
Technology Inc. for details.
Package Type
General Description
The TC51 is a very low power, open drain output,
CMOS voltage detector with built-in delay. It is
parti cularly well-suite d for battery powered application s
becaus e of its extrem ely low 1µA operat ing current and
small surface-mount packaging. Each part is laser-
trimmed to the de sired th reshol d volt age , which c an be
specified from 1.6V to 6.0V. The standard built-in
output delay is 50msec-200msec.
The device includes a comparator, low-current high-
preci sion ref erence , las er-progra mmed v olt age d ivide r,
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 imm ediately d riven to a lo gic
LOW. VOUT remains LOW until VIN rises a bove V DET-
by an amount VHYST, whereupon it returns to a logic
HIGH after expiration of the built-in delay time.
Functional Block Diagram
Part Number Package Temp. Range
TC51-xxxxxxxxxx 3-Pin SOT-23A -40°C to +85°C
V
IN
V
OUT
V
SS
T
C51
1
2
3-Pin SOT-23A
NOTE: 3-Pin SOT-23A is equivalent to the EIAJ SC-59.
VIN
VSS
VOUT
VREF
Delay
Circuit
1µA Voltage Detector with Output Delay
TC51
DS21429B-page 2 2002 Microchip Technology Inc.
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage ........................................................+12V
Output Curren t .................................... ...... ..... .....50mA
Output Voltage: Open Drain..........(VSS – 0.3V) to 12V
Power Dissipation (TA ≤ 70°C):
3-Pin SOT-23A...........................................240mW
Operati ng Tem per atu re Range...... ...... .-40°C to +85°C
Storage Temperature Range..............-65°C to +150°C
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and funct ional 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.
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
µAV
IN = 1.5V
VIN = 2.0V
VIN = 3.0V
VIN = 4.0V
VIN = 5.0V
VDET- Threshold V oltage 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 VOL = 0.5V, VIN = 1.0V
VIN = 2.0V
VIN = 3.0V
VIN = 4.0V
VIN = 5.0V
TDLY De lay Time 50 —200 msec Standard
TC (VDET-) Tempco of (VDET-) —±100 —ppm/°C-40°C ≤ TA ≤ 85°C
Note 1: VT is the factory programmed threshold voltage setting.
2002 Microchip Technology Inc. DS21429B-page 3
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 Description
1V
OUT 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).
2V
SS Ground terminal.
3V
IN Analog input. This pin is both the power supply input and the voltage to be monitored.
TC51
DS21429B-page 4 2002 Microchip Technology Inc.
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. Ge nerally, VOUT can pu ll down to within 0 .5V of
VSS at rated outpu t current and in put voltag e. (Also see
Section 1.0, Electrical Characteristics).
The output, VOUT, stays va lid 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 <V
IN < VDET+. (VDET+ = VDET- + VHYST). If an d
when the input rises above VDET+, the output will
assume its inactive state after Delay Time (TDLY).
FIGURE 3-1: TIMING DIAGRAM
V
IN
Detect Voltage V
DET
-
Minimum Operatin
g
Volta
ge
V
HY
S
T
V
DET
+
Output Volta
ge
R
e
l
ease
Volta
ge
Ground Level
Ground Level
Dela
y
Time (TDL
Y
)
V
OUT
2002 Microchip Technology Inc. DS21429B-page 5
TC51
4.0 APPLICATIONS INFORMATION
4.1 Processor RESET Supervisor
Figure 4-1 shows the TC51 used as a processor reset
supervi so r. Because the TC51 is avai lab le in thres hol d
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 suppl y cu r rent 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.
FIGURE 4-1: PROCESSOR RESET
SUPERVISOR
FIGURE 4-2: TC51 OPERATION DURING POWER-UP, BROWN-OUT AND POWER DOWN
TC51
V
OUT
GND
V
DD
V
DD
Processor
RESET
R1
47K
0.7V
Power-Up
Steady
State
Operation
TDLY
Time
TDLY
Brown-Out Power Down
Nominal
Power Supply
Voltage
Threshold
Voltage
(VDET-, VDET+)
VOH
TC51 Output
VOL
TC51
DS21429B-page 6 2002 Microchip Technology Inc.
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 ch aracteristics 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.
4.0
3.0
1.0
0.0
024 6810
INPUT VOLTAGE VIN (V)
TA = 80
°
C
-
30
°
C
-30
°
C-
30
°
C
2
5
°
C
2.0
TC51N1602
1. SUPPLY CURRENT VS. INPUT VOLTAGE
SUPPLY CURRENT I
SS
(µA)
4.0
3.0
1.0
0.0
0246810
INPUT VOLTAGE VIN (V)
2.0
TC51N2502
SUPPLY CURRENT I
SS
(µA)
2
5
°
C
2
5
°
C
4.0
3.0
1.0
0.0
0246810
INPUT VOLTAGE VIN (V)
2.0
TC51N3502
SUPPLY CURRENT I
SS
(µA)
TA = 80
°
C
T
A
=
80
°
C
1.8
1.7
1.5
1.4
-40 -20 0 20 40 60 80
AMBIENT TEMPERATURE TA (°C)
1.6
TC51N1602
2. THRESHOLD VOLTAGE, HYSTERESIS VOLTAGE VS. AMBIENT TEMPERATURE
THRESHOLD HYSTERESIS VOLTAGE V
DET
–
,V
HYST
80
VHYST
2.8
2.7
2.5
2.4
2.3
-40 -20 0 20 40 60
AMBIENT TEMPERATURE TA (°C)
2.6
TC51N2502
THRESHOLD HYSTERESIS VOLTAGE V
DET
–
,V
HYST
VHYST
80
3.8
3.7
3.5
3.4
3.3
3.2
-40 -20 0 20 40 60
AMBIENT TEMPERATURE TA (°C)
3.6
TC51N3502
THRESHOLD HYSTERESIS VOLTAGE V
DET
–
,V
HYST
VDET–
VDET–
VDET–
VHYST
3.0
2.5
1.5
1.0
0.5
0.0
0123
INPUT VOLTAGE VIN (V)
2.0
TC51N1602
3. OUTPUT VOLTAGE VS. INPUT VOLTAGE
OUTPUT VOLTAGE VOUT (V)
VIN – VOUT: 100k
TA = 30
°
C
= 25
°
C
= 80
°
C
4
3
1
0
012
34
INPUT VOLTAGE VIN (V)
2
TC51N2502
OUTPUT VOLTAGE VOUT (V)
VIN – VOUT: 100k
TA = 30
°
C
= 25
°
C
= 80
°
C4
5
3
1
0
012345
INPUT VOLTAGE VIN (V)
2
TC51N3502
OUTPUT VOLTAGE VOUT (V)
VIN – VOUT: 100k
TA = 30
°
C
= 25
°
C
= 80
°
C
2002 Microchip Technology Inc. DS21429B-page 7
TC51
5.0 TYPICAL CHARACTERISTIC S (CONTINU ED)
15.0
12.5
7.5
5.0
2.5
0.0
0.0 0.5 1.0 1.5 2.0
V
DS
(V)
10.0
TC51N1602
4. OUTPUT CURRENT VS. V
DS
OUTPUT CURRENT I
OUT
(mA)
T
A
= 25
°
C
V
IN
= 1.5V
1.0V
1400
1200
800
600
400
200
0 0.2 0.4 0.6 0.8 1.0
V
DS
(V)
1000
TC51N1602
OUTPUT CURRENT I
OUT
(
µ
A)
T
A
= 25
°
C
V
IN
= 0.8V
0.7V
30
25
15
10
5
0
0.0 0.5 1.0 1.5 2.0 2.5
V
DS
(V)
20
TC51N2502
OUTPUT CURRENT I
OUT
(mA)
T
A
= 25
°
C
V
IN
= 2.0V
1.5V
1200
1000
600
400
200
0
0.0 0.2 0.4 0.6 0.8 1.0
V
DS
(V)
800
TC51N2502
OUTPUT CURRENT I
OUT
(
µ
A)
T
A
= 25
°
C
V
IN
= 0.8V
0.7V
60
50
30
20
10
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
V
DS
(V)
40
TC51N3502
OUTPUT CURRENT I
OUT
(mA)
T
A
= 25
°
C
V
IN
= 3.0V V
IN
= 0.8V
2.5V
0.7V
2.0V
1.5V
1400
1200
800
600
400
200
0.0 0.2 0.4 0.6 0.8 1.0
V
DS
(V)
1000
TC51N3502
OUTPUT CURRENT I
OUT
(
µ
A)
T
A
= 25
°
C
TC51
DS21429B-page 8 2002 Microchip Technology Inc.
5.0 TYPICAL CHARACTERISTICS (CONTINUED)
15.0
12.5
7.5
5.0
2.5
0.0
0.0 0.5 1.0 1.5 2.0
INPUT VOLTAGE VIN (V)
10.0
TC51N1602
5. OUTPUT CURRENT VS. INPUT VOLTAGE
OUTPUT CURRENT I
OUT
(mA)
VDS = 0.5V TA = 30
°
C
2
5
°
C
80
°
C
80
°
C
2
5
°
C
2
5
°
C
40
35
25
20
15
10
5
0
0 1.0 2.0 3.0 4.0
INPUT VOLTAGE VIN (V)
30
TC51N3502
OUTPUT CURRENT I
OUT
(mA)
25
20
15
10
5
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
INPUT VOLTAGE VIN (V)
TC51N2502
OUTPUT CURRENT I
OUT
(mA)
T
A
= 30
°
C
VDS = 0.5V
VDS = 0.5V
80
°
C
T
A
°
C
2002 Microchip Technology Inc. DS21429B-page 9
TC51
6.0 PACKAGING INFORMATION
6.1 Package Marking Information
6.2 Taping Form
Symbol Output Voltage
KNch0.
LNch1.
MNch2.
NNch3.
PNch4.
RNch5.
SNch6.
3
1represents N-channel indication and integer part
of output voltage
Symbol Voltage
0.0
1.1
2.2
3.3
4.4
5.5
6.6
7.7
8.8
9.9
Symbol Delay Time
5 50ms-200ms
2represents first decimal of output voltage
3repres ents delay ti me
4repr esents assembly l ot code
Component Taping Orientation for 3-Pin SOT-23A (EIAJ SC-59) Devices
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
3-Pin SOT-23A 8 mm 4 mm 3000 7 in
Carrier Tape, Number of Components Per Reel and Reel Size
User Direction of Feed
Device
Marking
PIN 1
Standard Reel Component Orientation
for TR Suffix Device
(Mark Right Side Up)
W
P
TC51
DS21429B-page 10 2002 Microchip Technology Inc.
6.3 Package Dimensions
.071 (1.80)
.055 (1.40)
PIN 1
.118 (3.00)
.098 (2.50)
.020 (0.50)
.012 (0.30)
.075 (1.90)
REF.
.122 (3.10)
.106 (2.70)
.051 (1.30)
.035 (0.90)
.006 (0.15)
.000 (0.00)
.022 (0.55)
.014 (0.35)
10° MAX. .010 (0.25)
.004 (0.09)
SOT-23A-3
Dimensions: inches (mm)
2002 Microchip Technology Inc. DS21429B-page11
TC51
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
Sales and Support
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)
Ta ping Direction:
TR: Standard Taping
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational diff erences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. T he Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.c om)
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.
TC51
DS21429B-page12 2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc. DS21429B-page 13
TC51
Information contained in this publication regarding device
applications and the like is intended through sug gestion 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 Microc hip Technology Incorporated with r espect
to the accuracy or use of such inf orm ation, or inf ringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s product s as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, 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 T ech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexRO M, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, MXLAB, PICC, PICDEM, PICDEM.net, rfPIC, Se lect
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.
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® 8-bit MCUs, KEELOQ® code ho pp in g
devices, Se rial EEP ROM s, micro pe ri ph era ls,
non-vol atil e me mor y and ana l og pro duc ts. In
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
DS21429B-page 14 2002 Microchip Technology Inc.
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