TC54 Series
VOLTAGE DETECTOR
FEATURES
s
s
s
s
s
Precise Detection Thresholds .... Standard
±
2.0%
Custom
±
1.0%
Small Packages ......3-Pin SOT-23A, 3-Pin SOT-89,
3-Pin TO-92
Low Current Drain ..................................... Typ. 1
µ
A
Wide Detection Range .......................... 1.1V to 6.0V
Wide Operating Voltage Range ............ 0.7V to 10V
GENERAL DESCRIPTION
The TC54 Series are CMOS voltage detectors, suited
especially for battery-powered applications because of their
extremely low 1µA operating current and small surface-
mount packaging. Each part is laser trimmed to the desired
threshold voltage which can be specified from 1.1V to 6.0V,
in 0.1V steps for a 2% and 1.5V to 6.0V for a 1% tolerance.
The device includes a comparator, low-current high-
precision reference, laser-trimmed divider, hysteresis circuit
and output driver. The TC54 is available with either an open-
drain or complementary output stage.
In operation, the TC54's output (V
OUT
) remains in the
logic HIGH state as long as V
IN
is greater than the
–
specified threshold voltage (V
DET
). When V
IN
falls below
–
V
DET
, the output is driven to a logic LOW. V
OUT
remains
–
LOW until V
IN
rises above V
DET
by an amount V
HYST
,
whereupon it resets to a logic HIGH.
APPLICATIONS
s
s
s
s
s
Battery Voltage Monitoring
Microprocessor Reset
System Brownout Protection
Switching Circuit in Battery Backup
Level Discriminator
PIN CONFIGURATIONS
*3-Pin SOT-23A
VIN
2
1 2 3
3-Pin SOT-89
3-Pin TO-92
ORDERING INFORMATION
PART CODE TC54 V X XX X X X XX XXX
Output form:
N = Nch Open Drain
C = CMOS Output
Detected Voltage:
Ex: 15 = 1.5V; 60 = 6.0V
Ex: 11 = 1.1V; 60 = 6.0V
1.0% Tol.
2.0% Tol.
TC54
1
VOUT
3
VSS
1
VOUT
2
VIN
TC54
TC54
3
VSS
VOUT
*3-Pin SOT-23A is equivalent to EIAJ SC-59
VIN
VSS
Extra Feature Code:
Fixed: 0
Tolerance:
1 = 1.0% (custom)
2 = 2.0% (standard)
TC54VC only
FUNCTIONAL BLOCK DIAGRAM
2
VIN
Temperature:
E: – 40°C to + 85°C
Package Type and Pin Count:
CB: 3-Pin SOT-23A*, MB: 3-Pin SOT-89,
ZB: 3-Pin TO-92
–
+
VOUT
1
Taping Direction:
TR: Standard Taping
RT: Reverse Taping
No Suffix: TO-92 Bulk
VREF
VSS
3
* 3-Pin SOT-23A is equivalent to EIAJ SC-59.
TC54VN has open-drain output.
TC54VC has complementary output.
© 2001 Microchip Technology Inc.
DS21434A
TC54-13
8/23/99
VOLTAGE DETECTOR
TC54 Series
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage V
IN
......................................................12V
Output Voltage: CMOS ............. (V
SS
– 0.3) to (V
IN
+ 0.3 )
Open Drain ................ (V
SS
– 0.3) to 12V
Output Current ......................................................... 50mA
Power Dissipation: (T
A
≤
70°C)
3-Pin SOT-23A ...............................................240mW
3-Pin SOT-89 .................................................. 400mW
3-Pin TO-92 .................................................... 440mW
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.
ELECTRICAL CHARACTERISTICS:
T
A
= 25°C, unless otherwise specified.
Symbol
V
IN
I
SS
Parameter
Operating Voltage
Quiescent Current
Test Conditions
–
V
DET
= 0.8 to 6.0V
V
IN
= 2.1V
3.0V
4.0V
5.0V
Min
0.7
—
Typ
1.0
1.3
1.6
2.0
—
–
(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
DET
Threshold Voltage
Hysteresis Range
Output Current
V
OL
= 0.5V
V
IN
= 2.1V
3.0V
4.0V
5.0V
V
IN
= 8.0V
V
HYST
I
OUT
–
(V
DET
)
x 0.98
–
(V
DET
)
x 0.02
—
V
V
mA
–
T
C
(V
DET
)
Tempco of
–
(V
DET
)
TC54VC Only: V
OH
= V
IN
– 2.1V
– 40°C
≤
T
A
≤
85°C
—
ppm/°C
PIN DESCRIPTION
Pin No.
1
2
3
Symbol
V
OUT
V
IN
V
SS
Description
–
Digital output. This output goes low when V
IN
drops below V
DET
and returns high when V
IN
–
rises above V
DET
+ V
HYST
. (See timing chart).
Analog input. This pin is both the power supply input and the voltage to be monitored.
Ground terminal.
TC54-13 8/23/99
2
© 2001 Microchip Technology Inc.
DS21434A
VOLTAGE DETECTOR
TC54 Series
TIMING CHART
DESCRIPTION OF OPERATION
+
VDET
VHYST
VIN
RELEASE
RESET
OR
VOLTAGE
VOLTAGE
–
DETECT VOLTAGE VDET
MINIMUM OPERATING
VOLTAGE
GROUND LEVEL
OUTPUT VOLTAGE
GROUND LEVEL
Refer to the Timing Chart below. In normal steady-state
–
operation, when V
IN
> V
DET
, the output will be at a logic high.
In the case of the TC54V, this is an open-drain condition. If
–
and when the input falls below V
DET
, the output will pull down
(Logic 0) to V
SS
. Generally, V
OUT
can pull down to within
0.5V of V
SS
at rated output current and input voltage. (See
the Electrical Characteristics section).
The output, V
OUT
, will stay valid until the input voltage
falls below the Minimum Operating Voltage, V
IN
(MIN), of
0.7V. Below this minimum operating voltage, the output is
undefined. During power-up or anytime V
IN
has fallen below
V
IN
(MIN), V
OUT
will remain undefined until V
IN
rises above
V
IN
(MIN), at which time the output will become valid. V
OUT
+
will be in its active low state while V
IN
(MIN) < V
IN
< V
DET
.
+
–
(V
DET
= V
DET
+ V
HYST
). If and when the input rises above
+
V
DET
, the output will assume its inactive state. (High for
TC54VC, open-drain for TC54VN).
APPLICATIONS
Refer to TelCom Semiconductor Application Note #2,
Using the TC54 Voltage Detector
.
MARKING
3-Pin SOT-23A
3-Pin SOT-89
3-Pin TO-92
1 2 3 4
5 6 7 8
9 10 11 12
= output (Nch or CMOS) plus first voltage digit
1 2 3 4 5 6
Nch
L M N P R S
CMOS
B C D E F H
D
ex: CMOS 3.x =
kkkk
= first voltage decimal (0-9)
D 4
ex: CMOS 3.4 =
kkkk
&
= assembly lot number
,
&
= 54x (fixed)
= output (C = CMOS, N = Nch)
= first voltage digit (2-6)
= first voltage decimal (0-9)
= extra feature code : fixed : 0
= detecting accuracy
1 =
±
1.0% (custom), 2 =
±
2.0% (standard)
,
,
&
= assembly lot number
© 2001 Microchip Technology Inc.
DS21434A
3
TC54-13 8/23/99
VOLTAGE DETECTOR
TC54 Series
TAPING FORMS
Component Taping Orientation for 3-Pin SOT-23A(EIAJ SC-59) Devices
PIN 1
User Direction of Feed
Device
Marking
Device
Marking
User Direction of Feed
W
PIN 1
Standard Reel Component Orientation
for TR Suffix Device
(Mark Right Side Up)
P
Reverse Reel Component Orientation
for RT Suffix Device
(Mark Upside Down)
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
Component Taping Orientation for 3-Pin SOT-89
User Direction of Feed
Device
Marking
Device
Marking
User Direction of Feed
W
PIN 1
Standard Reel Component Orientation
for TR Suffix Device
(Mark Right Side Up)
P
Reverse Reel Component Orientation
for RT Suffix Device
(Mark Upside Down)
Carrier Tape, Reel Size, and Number of Components Per Reel
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
3-Pin SOT-89
12 mm
8 mm
1000
7 in
TC54-13 8/23/99
4
© 2001 Microchip Technology Inc.
DS21434A
VOLTAGE DETECTOR
TC54 Series
TAPING FORMS
(Cont.)
Component Taping Orientation for 3-Pin TO-92 Devices
User Direction of Feed
P
Mark
Face
M
ARK
F
ACE
M
ARK
F
ACE
M
ARK
F
ACE
Cover
Tape
Carrier
Tape
W
Standard Reel Component Orientation
for TR Suffix Device
Reverse Reel Component Orientation
for RT Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
3-Pin TO-92
18 mm
12.7 mm
1000
14 in
© 2001 Microchip Technology Inc.
DS21434A
5
TC54-13 8/23/99
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