TC54
Voltage Detector
Features
General Description
• Precise Detection Thresholds: Standard ±2.0%,
Custom ±1.0%
• Small Packages: 3-Pin SOT-23A, 3-Pin SOT-89,
TO-92 and 5-Pin SOT-23A (7.7V only)
• Low Current Drain: Typ. 1 µA
• Wide Detection Range: 1.1V to 6.0V and 7.7V
• Wide Operating Voltage Range: 0.7V to 10V
The TC54 series are CMOS voltage detectors that are
especially well suited for battery-powered applications
because of their extremely low 1 µA operating current
and small surface-mount packaging. Each part is lasertrimmed to the desired threshold voltage, which can be
specified from 1.4V to 7.7V for a 2% tolerance and from
1.5V to 6.0V for a 1% tolerance.
Applications
•
•
•
•
•
Battery Voltage Monitoring
Microprocessor Reset
System Brown-Out Protection
Switching Circuit in Battery Backup
Level Discriminator
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.
Functional Block Diagram
TC54VC only
2
The device includes a comparator, low-current highprecision reference, laser-trimmed divider, hysteresis
circuit and output driver. The TC54 is available with
either an open-drain or complementary output stage.
VIN
Package Types
3-Pin SOT-23A
VIN
–
+
3-Pin SOT-89
VIN
3
VOUT
1
TC54
TC54
1
VREF
VSS
VOUT
3
2
VSS
3-Pin TO-92
TC54VN has open-drain output.
TC54VC has complementary output.
123
1
2
3
VOUT VIN VSS
5-Pin SOT-23A
NC
NC
5
4
TC54
1
VOUT VIN VSS
Note:
2004 Microchip Technology Inc.
2
3
VOUT VIN VSS
3-Pin SOT-23A is equivalent to the
EIAJ SC-59
5-Pin SOT-23A is equivalent to the
EIAJ SC-74A. (7.7V ONLY)
DS21434G-page 1
TC54
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
Input Voltage ...................................................................+12V
† 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.
Output Current ..............................................................50 mA
Output Voltage: CMOS................(VSS – 0.3V) to (VIN + 0.3V)
Open-Drain.....................(VSS – 0.3V) to 12V
PIN FUNCTION TABLE
Power Dissipation (TA ≤ 70°C):
3-Pin SOT-23A .......................................................240 mW
3-Pin SOT-89..........................................................500 mW
5-Pin SOT-23A .......................................................240 mW
3-Pin TO-92 ............................................................300 mW
Symbol
Operating Temperature Range........................-40°C to +85°C
Storage Temperature Range .........................-65°C to +150°C
Description
VOUT
Digital Output
VIN
Analog Input
VSS
Ground Terminal
NC
No Connect
NC
No Connect
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, TA = +25°C.
Sym
Min
Typ
Max
Units
Operating Voltage
Parameter
VIN
0.7
—
10.0
V
Quiescent Current
ISS
—
0.8
2.7
µA
—
0.9
3.0
VIN = 3.0V
—
1.0
3.2
VIN = 4.0V
—
1.1
3.6
VIN = 5.0V
1.37
1.4
1.43
2.06
2.1
2.14
TC54VX21
2.65
2.7
2.75
TC54VX27
2.84
2.9
2.96
TC54VX29
2.94
3.0
3.06
TC54VX30
4.12
4.2
4.28
TC54VX42
4.21
4.3
4.39
TC54VX43
7.54
7.7
7.86
TC54VX77 (5-pin SOT-23A only)
Threshold Voltage
(Note 1)
Hysteresis Voltage
Output Current
Tempco of (VDET–)
Delay Time
Note 1:
VDET –
VHYST
IOUT
V
mV
Test Conditions
(VDET –) = 0.8 to 6.0V
VIN = 2.0V
TC54VX14
28
70
112
42
105
168
VDET = 2.1V (typ)
54
135
216
VDET = 2.7V (typ)
58
145
232
VDET = 2.9V (typ)
60
150
240
VDET = 3.0V (typ)
84
210
336
VDET = 4.2V (typ)
86
215
344
VDET = 4.3V (typ)
154
385
616
VDET = 7.7V (typ)
mA
VDET = 1.4V (typ)
—
7.7
—
—
10.1
—
VIN = 3.0V
VOL = 0.5V, VIN = 2.1V
—
11.5
—
VIN = 4.0V
—
13.0
—
VIN = 5.0V
—
-10.0
—
TC54VC Only:
VOH = VIN – 2.1V, VIN = 8.0V
TC (VDET –)
—
±100
—
tDLY
—
—
0.2
ppm/°C -40°C ≤ TA ≤ 85°C
ms
VDET – → VOUT inversion
For other voltage options, please contact your regional Microchip sales office.
DS21434G-page 2
2004 Microchip Technology Inc.
TC54
VDET –
VDD
tDLY
OUTPUT
FIGURE 1-1:
VOH
Timing Diagram.
2004 Microchip Technology Inc.
DS21434G-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-23A)
2.1
Pin No.
(3-Pin SOT-89)
(3-Pin TO-92)
Pin No.
(5-Pin SOT-23A)
Symbol
1
1
1
VOUT
Digital Output
3
2
2
VIN
Analog Input
2
3
3
VSS
Ground Terminal
—
—
4
NC
No Connect
—
—
5
NC
No Connect
Digital Output (VOUT)
VOUT goes low when VIN drops below VDET – and
returns high when VIN rises above VDET – + VHYST.
(See Figure 3-1).
2.3
Analog Input (VIN)
Ground Terminal (VSS)
VSS provides the negative reference for the analog
input voltage. Typically, the circuit ground is used.
2.4
2.2
Description
No Connect (NC)
No internal connection.
VIN can be used for power supply monitoring or a
voltage level that requires monitoring.
DS21434G-page 4
2004 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”).
VIN
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).
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.
2004 Microchip Technology Inc.
DS21434G-page 5
TC54
4.0
APPLICATIONS INFORMATION
4.1
Modifying The Trip Point, VDET –
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 µA operating current required by the TC54. A
reasonable value for this bleeder current is 100 µA (100
times the 1 µA required by the TC54). For example, if
VDET – = 2V and the desired trip point is 2.5V, the value
of R1 + R2 is 25 kΩ (2.5V/100 µA). 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.
4.2
Other Applications
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 logic-level
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
270Ω
VCC
VIN
RL
VOUT
TC54VX
MTP3055EL
VSOURCE
VSS
R2
VIN
R1
TC54
VOUT
VSS
FIGURE 4-2:
Protection.
MOSFET Low Drive
+
VIN
–
TC54VX
VOUT
R
1
V
= -------------------- = V
SOURCE
DET
R1 + R 2
VSS
Where:
VSOURCE = Voltage to be monitored
(VDET –) = Threshold Voltage setting of TC54
Note:
In this example, VSOURCE must be
greater than (VDET –)
FIGURE 4-1:
Modify trip-point of the TC54
using external resistor divider.
BATLOW
FIGURE 4-3:
Battery Voltage Monitor.
VIN
+
Pwr
Sply
TC54VX
VOUT
Power Good
–
VSS
FIGURE 4-4:
DS21434G-page 6
Power Good Monitor.
2004 Microchip Technology Inc.
TC54
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
3-Pin SOT-23A
1
1
2
3
4
1
3
represents output configuration (CMOS or Nch)
and first integer of voltage
1
1
D
Symbol
Output
Voltage
B
CMOS
1.
C
CMOS
2.
D
CMOS
3.
E
CMOS
4.
F
CMOS
5.
H
CMOS
6.
I
CMOS
7.
Symbol
Output
2
2
3
4
represents output configuration and first integer
of voltage
Symbol
Output
Voltage
T
Nch
7.
represents first decimal of output voltage
Symbol
Voltage
0
.0
1
.1
2
.2
3
.3
4
.4
Voltage
5
.5
.6
L
Nch
1.
6
M
Nch
2.
7
.7
.8
.9
N
Nch
3.
8
P
Nch
4.
9
R
Nch
5.
S
Nch
6.
T
Nch
7.
3
&
4
represents assembly lot code
represents first decimal of output voltage (0-9)
Ex: CMOS 3.x =
3
2
4
Ex: CMOS 3.x =
2
5-Pin SOT-23A
3-Pin SOT-89
D 4
Symbol
Voltage
Symbol
Voltage
0
.0
6
.6
1
.1
7
.7
2
.2
8
.8
3
.3
9
.9
4
.4
5
.5
&
4
represents assembly lot code
2004 Microchip Technology Inc.
DS21434G-page 7
TC54
Package Marking Information (Continued)
3-Pin TO-92
1 2 3 4
5 6 7 8
1 , 2 ,& 3
4
= 54X (fixed)
represents output configuration (CMOS or Nch)
Ex: CMOS 3.x = C
Symbol
5
6
7
8
Output
C
CMOS
N
N-Channel
represents first integer of detect voltage
Symbol
Voltage
2
2.
3
3.
4
4.
5
5.
6
6.
represents first decimal of detect voltage
Symbol
Voltage
Symbol
Voltage
0
.0
5
.5
1
.1
6
.6
2
.2
7
.7
3
.3
8
.8
4
.4
9
.9
represents the output Delay Time
Symbol
Delay Time
0
No Delay
respresents the device accuracy
Symbol
Accuracy
1
±1.0% (custom)
2
±2.0% (standard)
DS21434G-page 8
2004 Microchip Technology Inc.
TC54
3-Lead Plastic Small Outline Transistor (CB) (SOT23A)
E
E1
2
B
p1
n
D
p
1
c
A
φ
A2
A1
L
Units
Dimension Limits
n
p
Number of Pins
Pitch
Outside lead pitch (basic)
Overall Height
Molded Package Thickness
Standoff
Overall Width
Molded Package Width
Overall Length
Foot Length
Foot Angle
Lead Thickness
Lead Width
p1
A
A2
A1
E
E1
D
L
φ
c
B
MIN
.067
.035
.035
.000
.098
.055
.106
.014
0
.004
.012
INCHES
NOM
3
.037
.075
–
–
–
–
–
–
–
–
–
MAX
.083
.055
.051
.004
.118
.071
.122
.022
10
.014
.019
MILLIMETERS*
NOM
3
0.95
1.70
1.90
0.90
–
0.90
–
0.00
–
2.50
–
1.40
–
2.70
–
0.35
–
0
–
0.10
–
0.30
–
MIN
MAX
2.10
1.40
1.30
0.10
3.00
1.80
3.10
0.55
10
0.35
0.50
*Controlling Parameter
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.005" (0.127mm) per side.
EIAJ Equivalent: SC-59
Drawing No. C04-130
2004 Microchip Technology Inc.
DS21434G-page 9
TC54
3-Lead Plastic Small Outline Transistor (MB) (SOT89)
H
E
B1
3
B
D
D1
p1
2
p
R
1
B1
L
E1
A
C
Pitch
Outside lead pitch (basic)
Overall Height
Overall Width
Molded Package Width at Base
Molded Package Width at Top
Overall Length
Tab Length
Tab Corner Radii
Foot Length
Lead Thickness
Lead 2 Width
Leads 1 & 3 Width
Units
Dimension Limits
p
p1
A
H
E
E1
D
D1
R
L
c
B
B1
INCHES
MIN
MAX
.059 BSC
.118 BSC
.055
.063
.155
.167
.090
.102
.084
.090
.173
.181
.064
.072
.010
.035
.047
.014
.017
.017
.022
.014
.019
MILLIMETERS*
MIN
MAX
1.50 BSC
3.00 BSC
1.40
1.60
3.94
4.25
2.29
2.60
2.13
2.29
4.40
4.60
1.62
1.83
0.254
0.89
1.20
0.35
0.44
0.43
0.56
0.36
0.48
*Controlling Parameter
Notes:
Dimensions D and E1 do not include mold or flash protrusions. Mold flash or protrusions
shall not exceed .005" (0.127mm) per side.
JEDEC Equivalent: TO-243
Drawing No. C04-29
DS21434G-page 10
Revised 07-24-03
2004 Microchip Technology Inc.
TC54
5-Lead Plastic Small Outline Transistor (CT) (SOT23)
E
E1
p
B
p1
n
D
1
α
c
A
L
β
Units
Dimension Limits
n
p
MIN
φ
A2
A1
INCHES*
NOM
5
.038
.075
.046
.043
.003
.110
.064
.116
.018
5
.006
.017
5
5
MAX
MIN
MILLIMETERS
NOM
5
0.95
1.90
1.18
1.10
0.08
2.80
1.63
2.95
0.45
5
0.15
0.43
5
5
Number of Pins
Pitch
p1
Outside lead pitch (basic)
Overall Height
A
.035
.057
0.90
Molded Package Thickness
A2
.035
.051
0.90
Standoff
A1
.000
.006
0.00
Overall Width
E
.102
.118
2.60
Molded Package Width
E1
.059
.069
1.50
Overall Length
D
.110
.122
2.80
Foot Length
L
.014
.022
0.35
φ
Foot Angle
0
10
0
c
Lead Thickness
.004
.008
0.09
Lead Width
B
.014
.020
0.35
α
Mold Draft Angle Top
0
10
0
β
Mold Draft Angle Bottom
0
10
0
*Controlling Parameter
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not
exceed .005" (0.127mm) per side.
MAX
1.45
1.30
0.15
3.00
1.75
3.10
0.55
10
0.20
0.50
10
10
EIAJ Equivalent: SC-74A
Drawing No. C04-091
2004 Microchip Technology Inc.
DS21434G-page 11
TC54
3-Lead Plastic Transistor Outline (ZB) (TO-92)
E1
D
n
1
L
1
2
3
α
B
p
c
A
R
Units
Dimension Limits
n
p
β
INCHES*
NOM
3
.050
.130
.143
.175
.186
.170
.183
.085
.090
.500
.555
.014
.017
.016
.019
4
5
2
3
MIN
MAX
MILLIMETERS
NOM
3
1.27
3.30
3.62
4.45
4.71
4.32
4.64
2.16
2.29
12.70
14.10
0.36
0.43
0.41
0.48
4
5
2
3
MIN
Number of Pins
Pitch
Bottom to Package Flat
A
.155
Overall Width
E1
.195
Overall Length
D
.195
Molded Package Radius
R
.095
Tip to Seating Plane
L
.610
c
Lead Thickness
.020
Lead Width
B
.022
α
6
Mold Draft Angle Top
β
Mold Draft Angle Bottom
4
*Controlling Parameter
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: TO-92
Drawing No. C04-101
DS21434G-page 12
MAX
3.94
4.95
4.95
2.41
15.49
0.51
0.56
6
4
2004 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
Output Detected Extra Tolerance Temp. Pkg Taping
Config. Voltage Feature
Direction
Code
Examples:
a)
b)
Device:
TC54V:
Voltage Detector
Output Configuration:
N
C
= Nch Open-Drain
= CMOS Output
Detected Voltage:
14
21
27
29
30
42
43
=
=
=
=
=
=
=
Extra Feature Code:
0
= Fixed
Tolerance:
1
2
= 1% (custom)
= 2% (standard)
Temperature:
E
= -40°C to +85°C
Package:
CB = 3-Pin SOT-23A (equivalent to EIAJ SC-59)
MB = 3-Pin SOT-89
CT = 5-Pin SOT-23A (equivalent to EIAJ SC-74A)
(7.7V ONLY)
ZB = Transistor Outline (TO-92), 3-lead
Taping Direction:
713 = Standard Taping
1.4V
2.1V
2.7V
2.9V
3.0V
4.2V
4.3V
c)
d)
e)
f)
g)
h)
i)
j)
TC54VC1402ECB713: 1.4V Voltage
Detector, 2% Tol.,
SOT-23A-3-TR.
TC54VC1402EMB713: 1.4V Voltage
Detector,
2% Tol.,
SOT-89-3-TR.
TC54VC1402EZB:
1.4V Voltage
Detector,
2% Tol., TO-92.
TC54VC2102ECB713: 2.1V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
TC54VC2102EMB713: 2.1V Voltage
Detector,
2% Tol.,
SOT-89-3-TR.
TC54VC2102EZB:
2.1V Voltage
Detector,
2% Tol., TO-92.
TC54VC2702ECB713: 2.7V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
TC54VC3002ECB713: 3.0V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
TC54VN4202ECB713: 4.2V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
TC54VN7702ECT713: 7.7V Voltage
Detector,
2% Tol.,
SOT-23A-3-TR.
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.
Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2004 Microchip Technology Inc.
DS21434G-page 13
TC54
NOTES:
DS21434G-page 14
2004 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 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, Accuron,
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro,
PICSTART, PRO MATE, PowerSmart, rfPIC, and
SmartShunt are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
AmpLab, FilterLab, MXDEV, MXLAB, PICMASTER, 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, dsPICDEM,
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FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Migratable Memory, MPASM,
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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.
© 2004, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro® 8-bit MCUs, KEELOQ® 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.
2004 Microchip Technology Inc.
DS21434G-page 15
WORLDWIDE SALES AND SERVICE
AMERICAS
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Tel: 905-673-0699
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08/24/04
DS21434G-page 16
2004 Microchip Technology Inc.
1
TC54
VOLTAGE DETECTOR
FEATURES
■
■
■
■
■
Precise Detection Thresholds .... Standard ± 2.0%
Custom ± 1.0%
Small Packages ........... SOT-23A-3, SOT-89, TO-92
Low Current Drain ..................................... Typ. 1µA
Wide Detection Range .......................... 2.1V to 6.0V
Wide Operating Voltage Range ............ 1.5V to 10V
APPLICATIONS
■
■
■
■
■
Battery Voltage Monitoring
Microprocessor Reset
System Brownout Protection
Switching Circuit in Battery Backup
Level Discriminator
PIN CONFIGURATIONS
*SOT-23A-3
SOT-89-3
3
4
ORDERING INFORMATION
2
1 2 3
TC54
TC54
TC54
VOUT
2
3
VIN
VSS
VOUT
VSS
1
5
Output form:
N = Nch Open Drain
C = CMOS Output
Extra Feature Code: Fixed: 0
*SOT-23A-3 is equivalent to EIAJ (SC-59)
Tolerance:
1 = ± 1.0% (custom)
2 = ± 2.0% (standard)
FUNCTIONAL BLOCK DIAGRAM
2
PART CODE TC54 V X XX X X X XX XXX
Detected Voltage:
Ex: 21 = 2.1V; 60 = 6.0V
VIN
VSS
3
VOUT
The TC54 Series are CMOS voltage detectors, suited
especially for battery-powered applications because of their
extremely low 1µA operating current and small surfacemount packaging. Each part is laser trimmed to the desired
threshold voltage which can be specified from 2.1V to 6.0V,
in 0.1V steps.
The device includes a comparator, low-current highprecision reference, laser-trimmed divider, hysteresis circuit
and output driver. The TC54 is available with either an opendrain or complementary output stage.
In 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
–
V DET, the output is driven to a logic LOW. VOUT remains
LOW until VIN rises above V–DET by an amount V HYST,
whereupon it resets to a logic HIGH.
TO-92
VIN
1
2
GENERAL DESCRIPTION
TC54VC only
6
Temperature: E: – 40°C to + 85°C
Package Type and Pin Count:
CB: SOT-23A-3*, MB: SOT-89-3, ZB: TO-92-3
VIN
–
VOUT
1
+
Taping Direction:
Standard Taping
Reverse Taping
No suffix: TO-92 Bulk
7
*SOT-23A-3 is equivalent to EIAJ (SC-59).
VREF
VSS
3
8
TC54VN has open-drain output.
TC54VC has complementary output.
TC54-10 11/8/96
TELCOM SEMICONDUCTOR, INC.
4-279
VOLTAGE DETECTOR
TC54
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (VIN) ..................................................................... 12V
Output Voltage: CMOS ............ (VSS – 0.3) to (VIN + 0.3)
Open Drain ................. (VSS – 0.3) to 12V
Output Current .........................................................50mA
Power Dissipation: (TA ≤ 70°C)
SOT-23A-3 .....................................................240mW
SOT-89-3 .......................................................400mW
TO-92
.......................................................440mW
Operating Temperature .......................... – 40°C to + 85°C
Storage Temperature ........................... – 65°C to + 150°C
Soldering Temperature ...................... 300°C, 10 seconds
* 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 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 operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods
may affect device reliability.
ELECTRICAL CHARACTERISTICS: TA = 25°C, unless otherwise specified.
Symbol
Parameter
Test Conditions
V–DET
Min
VIN
ISS
Operating Voltage
Quiescent Current
–
VDET
Threshold Voltage
VHYST
Hysteresis Range
IOUT
Output Current
Nch VDS = 0.5
VIN = 2.1V
3.0V
4.0V
5.0V
–
Tempco of (VDET
)
Pch VDS = 2.1V
– 40°C ≤ TA ≤ 85°C
VIN = 8.0V
–
TC (VDET
)
VIN =
= 2.1 to 6.0V
2.1V
3.0V
4.0V
5.0V
Typ
1.5
1.0
1.3
1.6
2.0
(V–DET)
x 0.98
(V–DET)
x 0.02
(V–DET)
x 0.05
7.7
10.1
11.5
13.0
– 10.0
± 100
Max
10.0
3.0
3.4
3.8
4.2
(V–DET)
x 1.02
(V–DET)
x 0.08
Unit
V
µA
V
V
mA
ppm/°C
PIN DESCRIPTION
Pin No.
Symbol
1
2
VIN
VOUT
3
VSS
4-280
Description
Analog input. This pin is both the power supply input and the voltage to be monitored.
–
Digital output. This output goes low when VIN drops below VDET
and returns
–
high when VIN rises above V DET + VHYST. (See timing chart).
Ground terminal.
TELCOM SEMICONDUCTOR, INC.
VOLTAGE DETECTOR
1
TC54
DESCRIPTION OF OPERATION
TIMING CHART
+
VDET
VIN
–
DETECT VOLTAGE VDET
RELEASE
RESET
OR
VOLTAGE
VOLTAGE
VHYST
MINIMUM OPERATING
VOLTAGE
GROUND LEVEL
OUTPUT VOLTAGE
GROUND LEVEL
Refer to the Timing Chart below. In normal steady-state
–
operation, when VIN > VDET
, the output will be at a logic high.
In the case of the TC54V, this is an open-drain condition. If
– , the output will pull down
and when the input falls below VDET
(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).
The output, VOUT, will stay valid until the input voltage
falls below the Minimum Operating Voltage, VIN(MIN), of
1.5V. 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 < VDET
+
–
(VDET = VDET + VHYST). If and when the input rises above
V+DET, the output will assume its inactive state. (High for
TC54VC, open-drain for TC54VN).
2
3
4
APPLICATIONS
Refer to TelCom Semiconductor Application Note #2,
Using the TC54 Voltage Detector.
MARKING
SOT-23A-3
5
TO-92
SOT-89-3
1 2 3 4
5 6 7 8
9 10 11 12
a = output (Nch or CMOS) plus first voltage digit
2 3 4 5 6
Nch
M N P R S
CMOS
C D E F H
D
ex: CMOS 3.x = uuuu
b = first voltage decimal (0-9)
D 4
ex: CMOS 3.4 = uuuu
c & d = assembly lot number
6
a, b & c = 54_ (fixed)
d = output (C = CMOS, N = Nch)
e = first voltage digit (2-6)
f = first voltage decimal (0-9)
7
g = extra feature code : fixed : 0
h = detecting accuracy
1 = ± 1.0% (custom), 2 = ± 2.0% (standard)
i, j, k & l = assembly lot number
8
TELCOM SEMICONDUCTOR, INC.
4-281
=罗
、7
APPLICATION NOTE2
△J垂
UsING THE TELCOM TC54
semicOnductor,Inc■
VOLTAGE DETECTOR
oPERATION
lNTRODUCTlON
TeIConη
:s TC54 series of v0ltage detectors are de■
The TC54Ⅴ N
equiva丨 ent circuit is shown in Figure1■
signedtosupersedeavarietyofdisCretecomparatorcircu⒒ s
and bipolartechnology voltage detectors■
These vo丨 tage detectors are especia"y suited for app"■
cation in batteγ powered syst0ms because of their ex。
oⅥ r 1uA operating current. Each paH is |aser
treme丨 y 丨
The internal precision temperature■
prograΠ 1rη ed to the desired trip point vo丨 tage overthe range
diagraΠ 1of Figure1,the outputis forced active when VlN(
of 0■
0V in 100mV st0ps。 FOr Complete design
8V to 6Ⅱ
compensated reference
and comparatorcircuit consistenuy rnonitorVINfor an under■
When such a condition occurs,the output
isforced to the active(LOllVlstateandremainsthereunt"VlN
vo⒒ age condition。
is once again within to丨 erance. As shown in the tirning
(-VDET)(Where(-VDET)is the threshold vo⒒
age)and returns
f|exibⅡ ity,Complementary oropen■ drain output versions are
HlGH when VIN exceeds(-VDET)p丨 us5%hysteresis(exˉ
TC54package options inClude surface mount
SOT¨ 23and SOT。 890rthrough■ ho丨 eTO¨ 92types.
amp丨 e∶ if(-VDET)〓
ava"ab丨 e■
2■
OV,the output wⅢ go HlGH when VlN>
2.1V).
TC54BLOCκ DlAGRAM AND TIM∶ NG
lNPVT V0LTAGE
H、
DETECT VOLTAGE←
:Ⅰ
VDET)
早
l罕
RELEAsE
V0LTAGE(+VDETl
s|
:丨
MlNlMUM OPERATlNG
口
‘
TI
IIι
丨
∷
—
ˉ
——
——
v
<<<丨
I⊥
k丶
-x
9
V0LTAGE
GROUND LEVEL
O UT
」
∶ 亠
∶
I]卜
-{~」
0UTPUT VOLTAGE
<<<丨
L卩
Ι
VF
nly
:丨
Ⅰι
尸
'丨 ’
V
~lN
2
/TC54vC°
Vs S
3
GR0UND LEVEL
F:gure1臼
TC54As A MlCRoPROCEssOR REsET
GENERATOR
弼菇喋 u糍
缸#i
罗I茫琵芗盏忍挠丿
:f泥 :::e摞
i‰
℃%帑
弯
〓 ∶
昆
`萎W×
T茁 l%揣 J盛强
哩昼
::甘
r￡ I∶
I∮
WI∶
croprocessor
C∶ rcuit
lfζ
i丁
constant, replacing bipolar integrated voltage detectors
(see Table1)■
F∶ gure2.Microprocessor Reset Circuit using TC54
and ExternaI Delay
AN2ˉ 28/22/97
UsING THE TELCOM TC54
Vo… GE DETECTOR
AN■ 2
TabIe1口 TC54Cross Reference Listing
MFGR
PART#
TELCOM#
DEsCRIPTlON
MOtorOIa
MC33064Po5
MOtorOIa
MC34064Pˉ 5
MC34164P口 3
MOtorola
MC34164P-5
MOtorola
MOtorOIa
MC33164Pˉ 3
MC33164Pˉ 5
T。
TL77571LP
TC54VN4502EZB
TC54VN4502EZB
TC54VN2702EzB
TC54VN4302EZB
TC54VN2702EzB
TC54VN4302EzB
TC54VN4502EZB
TC54VN4502EZB
4.5V tHp,¨
MOtorOIa
I,
TL7757CLP
T,l,
TELCOM
AΠ RIBUTE
4o to+85C,TO■ 92
4.5V tHp,0to+7oC,TO¨ 92
2:7V tHp,o to+70C,TOˉ 92
4,3V tHp,O to+7oC,TOˉ 92
2,7V tHp,ˉ 4o to+85C,TO¨ 92
4.3V tHp,o40to+85C,TO¨ 92
4,5V top,o40to+85C,TO¨ 92
4.5V tHp,o to+70C,TO¨ 92
500tirnes Iess power
500tirnes Iess power
10tirnes less power
10tirnes less power
10tirnes Iess power
10tirnes Iess power
2000tirnes Iess power
2000tirnes less power
MODIFYING THE TRIP POlNT,-VDET
A丨
though the TC54has a pre■ programmed VDET,⒒
is
sometimes necessary to make adjustments during
prototyping. This can be accomp"shed by connecting an
externa丨 resistor diVider to a TC54which has a V′ DET loWer
than that of Vs。 uRcE(Figure3)■
TO maintain detector accuracy, the bleeder current
through the divider shou丨 d be significant丨 y higherthan the
1uA operating current required by the TC54. A reasonab|e
va丨 ue
forthis bleeder currentis100uA(100tirnes the1uA
required by the TC54)。
FOr example,矸 ←VDE→ 〓2V andthe
desired tHp pointis2■ 5V,the va丨 ue
of R1+R2is250K Ohms
(2.5V/100uA)■ The va|ue of R1+R2can be rounded to the
nearest standard va丨 ue and p丨 ugged into the equation of
Figure3to ca丨 cuIate va|ues for日 li and丨 R2. 1°/。 to丨 erance
resistors are reconγ ηended。
∩THER
APPLICATIONs
vsouRcE
乖
了田
Vs。 uRcE(T玎
甘早:圩 耳。
)
〓
(-vDET)
‘
Where∶
Vs。 uRcE〓 Vo⒒ ageto
(■
be mon⒒ ored
VDE→ 〓Thresh0丨 d Voltage Setting of TC54
Note:ln this examp丨 e,Vs。 uRcE must be
greater than(-VDET)
Figure3。 Mod∶ fy trip point of TC54us∶ ng externaI resistor divider
AN⒉28胆 2/g7
UsING THE TELCOM TC54
VOLTAGE DETECTOR
AN■ 2
ˉˉ
7/仑\<ˉ
4■
3V
27。
Ω
vcc
RL
PoⅦ 「
ER GooD
MTP3055EL
一
一
Figure4■ MOsFET IOW drive protec刂
on
F∶
gure6. POwer good:η onitor
LOw operating power and sma"physica|size rη ake the
TC54series idea丨 for rnany vo|tage detector appⅡ cations,
such asthose shown be丨 ow■ Figure4shows a丨 ow。 vo丨 tage
gate drive protection circuit,whiCh prevents overheating of
the|ogic丬 eve丨 MOSFET・ due to insufficient gate vo丨 tage■
BATLOW
WhentheinputsignaHs be丨 owthethreshold ofthe TC54VN,
its output groundsthe gate ofthe MOSFET■ Figure5and6
shoW the TC54in conventiona丨 voltage monitoring app"ca■
tions■
Figure5. Battery vOItage lη onitor
saIes offices
TeICom semiconductor
TeICoⅡ 】semiconductor
1300Terra Be"a Avenue
Austin Product Center
10sarn Chuk street,Ground Floor
9101Burnet Rd。 suite214
San PO KOng,KOwloon
HOng KOng
TEL∶ 852ˉ 2324ˉ 0122
FAX∶ 8F2ˉ 2354ˉ 9957
P。
O。
BOX7267
Aus刂 n,TX78758
TEL∶ 512ˉ 873o7100
FAX∶ 512ˉ 873ˉ 8236
MOunton View,CA94039¨ 7267
TEL∶ 650ˉ 968ˉ 9241
FAX∶ 650ˉ 967¨ 1590
tp。 telco吖 senη
Ⅱ
ter@c2sΠ 、
E。 MaⅡ ∶
lˉ
AN⒉ 28捏 γ97
i。
TeICom semiconductor H.κ ■Ltd■
com
Ponted in the U。
s。 A。