TC51 Series
TC51-1 7/22/99
© 2001 Microchip Technology Inc. DS21429A
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 Brownout Protection
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 ex-
tremely low 1 µA operating current and small surface-mount
packaging. Each part is laser-trimmed to the desired thresh-
old voltage, which can be specified from 1.6V to 6.0V in 0.1V
steps. The standard built-in output delay is 50 msec – 200
msec.
The device includes a comparator, low-current high-
precision reference, laser-programmed voltage divider, hys-
teresis 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 (V–
DET). When VIN falls below
V–
DET, the output is immediately driven to a logic LOW.
VOUT remains LOW until VIN rises above V–
DET by an
amount VHYST, whereupon it returns to a logic HIGH after
expiration of the built-in delay time.
FUNCTIONAL BLOCK DIAGRAM
1µA VOLTAGE DETECTOR WITH OUTPUT DELAY
PIN CONFIGURATIONS
V
IN
V
SS
V
OUT
V
REF
Delay
Circuit
V
SS
V
IN
3-Pin SOT-23A**
12
3
TC51
V
OUT
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**
Taping Direction:
TR: Standard Taping
RT: Reverse Taping
*Other voltages are available. Please contact Microchip
Technology Inc. for details.
ORDERING INFORMATION
PART CODE TC51 N 18 0 2 E CB XX
** 3-Pin SOT-23A is equivalent to EIAJ SC-59.
© 2001 Microchip Technology Inc.
TC51 Series
1µA VOLTAGE DETECTOR
WITH OUTPUT DELAY
2
TC51-1 7/22/99 © 2001 Microchip Technology Inc. DS21429A
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage VIN ......................................................12V
Output Voltage: Open-Drain................. (VSS – 0.3) to 12V
Output Current ........................................................50 mA
Power Dissipation: (TA ≤ 70°C)
3-Pin SOT-23A ..............................................240 mW
Operating Temperature..........................– 40°C to + 85°C
Storage Temperature ...........................– 65°C to + 150°C
Soldering Temperature (10 sec) ............................. 300°C
*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above those listed under Absolute Maximum Ratings may cause perma-
nent 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 operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods
may affect device reliability.
PIN DESCRIPTION
3-Pin SOT-23A
Pin No. 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 timing chart.)
2V
SS
Ground Terminal.
3V
IN Analog Input. This pin is both the power supply input and the voltage
to be
monitored.
NOTE : 1. VT is the factory programmed threshold voltage setting.
ELECTRICAL CHARACTERISTICS: TA = 25°C, unless otherwise specified.
Symbol Parameter Test Conditions Min Typ Max Unit
VIN Operating Voltage V–
DET = 1.6 to 6.0V 0.7 —10.0 V
ISS Quiescent Current VIN = 1.5V —0.9 2.6 µA
2.0V —1.0 3.0
3.0V —1.3 3.4
4.0V —1.6 3.8
5.0V —2.0 4.2
V–
DET Threshold Voltage Note 1 (VT)V
T ± 0.5% (VT)V
x 0.98 x 1.02
VHYST Hysteresis Voltage (V–
DET)(V
–
DET)(V
–
DET)V
x 0.02 x 0.05 x 0.08
IOUT Output Current VOL = 0.5V VIN = 1.0V —2.2 —mA
2.0V —7.7 —
3.0V 10.1
4.0V 11.5
5.0V 13.0
TDLY Delay Time Standard 50 — 200 msec
TC (V–
DET) Tempco of (V–
DET)– 40°C ≤ TA ≤ 85°C—± 100 — ppm/°C
TC51 Series
1µA VOLTAGE DETECTOR
WITH OUTPUT DELAY
3TC51-1 7/22/99
© 2001 Microchip Technology Inc. DS21429A
VOUT, stays valid until the input voltage falls below the
Minimum Operating Voltage, VIN(MIN), of 0.7V. Below this
minimum operating voltage, the output is undefined. During
power-up or anytime VIN has fallen below VIN(MIN), VOUT will
remain undefined until VIN rises above VIN(MIN), at which time
the output will become valid. VOUT will be in its active low
state while VIN(MIN) < VIN < V+
DET. (V+
DET = V–
DET + VHYST). If
and when the input rises above V+
DET, the output will assume
its inactive state after Delay Time (TDLY).
APPLICATIONS
Processor RESET Supervisor
Figure 2 shows the TC51 used as a processor reset
supervisor. Because the TC51 is available in threshold
settings of 1.6V to 6.0V in 100mV steps, the user can choose
the reset single threshold setting best suited to the system
power supply voltage at hand (please see
Application
Note #36
). Also, the 1µA supply current is significantly lower
than its nearest competitor.
As shown in the timing diagram (Figure 1),VOUT is
guaranteed low for voltages between 0.7V and V+
DET .The
TC51 activates its on-board delay timer once the power
supply voltage is within tolerance (i.e. greater than V+
DET).
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 main-
tained low to a guaranteed supply voltage down to 0.7V.
Figure 1. Timing Chart
Figure 3. TC51 Operation During Power-Up, Brown-Out and Power Down.
Figure 2. Processor Reset Supervisor
DETAILED DESCRIPTION
Please refer to Figure 1. In normal steady-state opera-
tion, when VIN > V–
DET, the output is high. If and when the
input falls below V–
DET, 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, (See the
Electrical
Characteristics
section).
TC51
V
OUT
GND
V
DD
V
DD
PROCESSOR
RESET
R1
47K
VIN
DETECT VOLTAGE VDET
MINIMUM OPERATING
VOLTAGE
VHYST
VDET
OUTPUT VOLTAGE
RELEASE
VOLTAGE
GROUND LEVEL
GROUND LEVEL
+
–
DELAY TIME (T
DLY
)
V
OUT
NOMINAL
SUPPLY VOLTAGE
THRESHOLD
VOLTAGE
VOH
TC51 OUTPUT
VOL
POWER
(V—DET, V+DFT)
0.7V
POWER-
UP BROWN
OUT
STEADY
STATE
OPERATION POWER DOWN
T
DLY
T
DLY
TIME
TC51 Series
1µA VOLTAGE DETECTOR
WITH OUTPUT DELAY
4
TC51-1 7/22/99 © 2001 Microchip Technology Inc. DS21429A
TYPICAL CHARACTERISTICS
4.0
3.0
1.0
0.0 024 6810
INPUT VOLTAGE (V
IN
) (V)
T
A
= 80°C–30°C–30°C–30°C
25°C
2.0
TC51N1602
1. SUPPLY CURRENT VS. INPUT VOLTAGE
SUPPLY CURRENT ISS (µA)
4.0
3.0
1.0
0.0 0246810
INPUT VOLTAGE (V
IN
)
2.0
TC51N2502
SUPPLY CURRENT ISS (µA)
25°C25°C
4.0
3.0
1.0
0.0 0246810
INPUT VOLTAGE (V
IN
)
2.0
TC51N3502
SUPPLY CURRENT ISS (µA)
1.8
1.7
1.5
1.4
–40 –20 0 20 40 60 80
AMBIENT TEMPERATURE T
A
(°C)
1.6
TC51N1602
2. THRESHOLD VOLTAGE, HYSTERESIS VOLTAGE VS. AMBIENT TEMPERATURE
THRESHOLD HYSTERESIS VOLTAGE V–
DET
,V
HYST
80
T
A
= 80°C
T
A
= 80°C
V
HYST
2.8
2.7
2.5
2.4
2.3
–40 –20 0 20 40 60
AMBIENT TEMPERATURE T
A
(°C)
2.6
TC51N2502
THRESHOLD HYSTERESIS VOLTAGE V–
DET
,V
HYST
V
HYST
80
3.8
3.7
3.5
3.4
3.3
3.2
–40 –20 0 20 40 60
AMBIENT TEMPERATURE T
A
(°C)
3.6
TC51N3502
THRESHOLD HYSTERESIS VOLTAGE V–
DET
,V
HYST
V
HYST
V–
DET
V–
DET
V–
DET
3.0
2.5
1.5
1.0
0.5
0.00123
INPUT VOLTAGE V
IN
(V)
2.0
TC51N1602
3. OUTPUT VOLTAGE VS. INPUT VOLTAGE
OUTPUT VOLTAGE VOUT (V)
V
IN
– V
OUT: 100kΩ
T
A = 30°C
= 25°C
= 80°C
4
3
1
0012
34
INPUT VOLTAGE V
IN
(V)
2
TC51N2502
OUTPUT VOLTAGE VOUT (V)
V
IN
– V
OUT: 100kΩ
T
A = 30°C
= 25°C
= 80°C
4
5
3
1
0012345
INPUT VOLTAGE V
IN
(V)
2
TC51N3502
OUTPUT VOLTAGE VOUT (V)
V
IN
– V
OUT: 100kΩ
T
A = 30°C
= 25°C
= 80°C
TC51 Series
1µA VOLTAGE DETECTOR
WITH OUTPUT DELAY
5TC51-1 7/22/99
© 2001 Microchip Technology Inc. DS21429A
TYPICAL CHARACTERISTICS (CONT.)
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
2000 0.2 0.4 0.6 0.8 1.0
V
DS
(V)
1000
TC51N1602
OUTPUT CURRENT I
OUT
(µA)
T
A
= 25°CV
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
(µA)
T
A
= 25°CV
IN
= 0.8V
0.7V
60
50
30
20
10
00 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°CV
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
(µA)
T
A
= 25°C
TC51 Series
1µA VOLTAGE DETECTOR
WITH OUTPUT DELAY
6
TC51-1 7/22/99 © 2001 Microchip Technology Inc. DS21429A
TYPICAL CHARACTERISTICS (CONT.)
15.0
12.5
7.5
5.0
2.5
0.0
0.0 0.5 1.0 1.5 2.0
INPUT VOLTAGE V
IN
(V)
10.0
TC51N1602
5. OUTPUT CURRENT VS. INPUT VOLTAGE
OUTPUT CURRENT I
OUT
(mA)
V
DS
= 0.5V T
A
= 30°C
25°C
80°C
80°C
25°C
25°C
40
35
25
20
15
10
5
00 1.0 2.0 3.0 4.0
INPUT VOLTAGE V
IN
(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 V
IN
(V)
TC51N2502
OUTPUT CURRENT I
OUT
(mA)
T
A
= 30°C
V
DS
= 0.5V
V
DS
= 0.5V
80°C
T
A
= 30°C
TC51 Series
1µA VOLTAGE DETECTOR
WITH OUTPUT DELAY
7TC51-1 7/22/99
© 2001 Microchip Technology Inc. DS21429A
Tape and Reel Specifications Table
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
3-Pin SOT-23A 8 mm 4 mm 3000 7
W
User Direction of Feed User Direction of Feed
Device
Marking
Component Taping Orientation for 3-Pin SOT-23A (EIAJ SC-59) Devices
Device
Marking
PIN 1
P
PIN 1
Standard Reel Component Orientation
for TR Suffix Device
(Mark Right Side Up)
Reverse Reel Component Orientation
for RT Suffix Device
(Mark Upside Down)
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
TAPING FORM
represents N-channel indication & integer part of
output voltage
Symbol Output Voltage
K Nch 0.
L Nch 1.
M Nch 2.
N Nch 3.
P Nch 4.
R Nch 5.
S Nch 6.
MARKINGS represents 1st decimal point of output voltage
Symbol Voltage Symbol Voltage
0.05 .5
1.16 .6
2.27 .7
3.38 .8
4.49 .9
represents delay time
Symbol Delay Time
5 50 ms ~ 200 ms
represents assembly lot code
3-Pin SOT-23A
3
TC51 Series
1µA VOLTAGE DETECTOR
WITH OUTPUT DELAY
8
TC51-1 7/22/99 © 2001 Microchip Technology Inc. DS21429A
Dimensions: inches (mm)
*NOTE: SOT-23A-3 is equivalent to EIAJ (SC-59)
3-Pin SOT-23A (EIAJ SC-59)
.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)
PACKAGE DIMENSIONS
TC51 Series
1µA VOLTAGE DETECTOR
WITH OUTPUT DELAY
9TC51-1 7/22/99
© 2001 Microchip Technology Inc. DS21429A
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by
update s. It is y our re sponsibilit y to en sure that your appli cation m eets with y our sp ecifications . No re presen tation or warrant y is given and no liability is
assumed by M icrochip Technolog y Incor porate d with respe ct to the a ccuracy or u se of such in format ion, o r infrin gemen t of patents or other intellectua l
property rights arising from such use or otherwise. Use of Microchipí s products as critical components in life support systems is not authorized exce pt wi th
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec-
tual prop erty rights. The Micro chip logo and name are reg istered trademarks o f Microchip Tech nology Inc. in the U.S .A. and other count ries. All rights
reserved. All other trademarks mentioned herein are the property of their respective companies.
All rights reserved.
©
2001 Microchip Technology Incorporated. Printed in the USA. 1/01 Printed on recycled paper.
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