©
2005 Microchip Technology Inc.
DS21342C-page 1
Features
• Combines Comparator and Voltage Reference in
a Single Package
• Optimized for Single Supply Operation
• Small Package: 8-Pin MSOP
• Ultra Low Input Bias Current: Less than 100pA
• Low Quiescent Current, Active: 6
μ
A (Typ.),
Shutdown Mode: 0.1
μ
A (Typ.)
• Rail-to-Rail Inputs and Outputs
• Operates Down to V
DD
= 1.8V
• Programmable Hysteresis
Applications
• Power Management Circuits
• Battery Operated Equipment
• Consumer Products
Device Selection Table
Package Type
General Description
The TC1031 is a low-power comparator and voltage
reference designed specifically for low-power applica-
tions. The TC1031 is designed for operation from a
single supply, however operation from dual supplies is
also possible. The power supply current drain is
independent of the magnitude of the power supply
voltage. The TC1031 can operate from two 1.5V
alkaline cells, and operation is ensured to V
DD
= 1.8V.
Typical active supply current is 6
μ
A. Rail-to-rail inputs
and outputs allow operation from low supply voltages
with large input and output signal swings.
The TC1031 provides a simple method for adding user-
adjustable hysteresis without feedback or complex
external circuitry. Hysteresis is adjusted with a simple
resistor divider on the HYST input. A shutdown input,
SHDN, disables the comparator and voltage reference
and reduces supply current to less than 0.1
μ
A
(maximum) when taken low.
The TC1031 is packaged in a space-saving 8-Pin
MSOP, making it ideal for applications requiring high
integration, small size and low power.
Functional Block Diagram
Part Number
Package
Temperature
Range
TC1031CEUA
8-Pin MSOP
-40°C to +85°C
V
REF
HYST
1
2
3
4
8
7
6
5
TC1031CEUA
V
DD
INA+
INA
-
OUT
8-Pin MSOP
SHDN
V
SS
V
SS
SHDN
IN+
V
DD
V
REF
IN-
HYST
OUT
Voltage
Reference
+
–
1
2
3
4
5
6
7
8
TC1031
TC1031
Linear Building Block – Low Power Voltage Reference with
Programmable Hysteresis Comparator and Shutdown
Obsolete Device
TC1031
DS21342C-page 2
©
2005 Microchip Technology Inc.
1.0
ELECTRICAL
CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage ......................................................6.0V
Voltage on Any Pin .......... (V
SS
– 0.3V) to (V
DD
+ 0.3V)
Junction Temperature....................................... +150°C
Operating Temperature Range............. -40°C to +85°C
Storage Temperature Range ..............-55°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 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.
TC1031 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Typical values apply at 25°C and V
DD
= 3.0V; T
A
= -40° to +85°C, and V
DD
= 1.8V to 5.5V, unless
otherwise specified.
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
V
DD
Supply Voltage
1.8
—
5.5
V
I
Q
Supply Current, Operating
—
6
10
μ
A
All Outputs Open, SHDN = V
DD
I
SHDN
Supply Current, Shutdown
—
—
0.1
μ
A
SHDN = V
SS
Shutdown Input
V
IH
Input High Threshold
80% V
DD
—
—
V
V
IL
Input Low Threshold
—
—
20% V
DD
V
I
SI
Shutdown Input Current
—
—
±100
nA
Comparator
R
OUT
(SD)
Output Resistance in Shutdown
20
—
—
M
Ω
SHDN = V
SS
C
OUT
(SD)
Output Capacitance in Shutdown
—
—
5
pF
SHDN = V
SS
T
SEL
Select Time
—
20
—
μ
sec
V
OUT
Valid from SHDN = V
IH
R
L
=10k
Ω
to V
SS
T
DESEL
Deselect Time
—
500
—
nsec
V
OUT
Invalid from SHDN = V
IL
R
L
=10k
Ω
to V
SS
V
ICMR
Common-Mode Input Voltage Range
V
SS
– 0.2
—
V
DD
+ 0.2
V
V
OS
Input Offset Voltage (Note 1)
–5
—
+5
mV
V
DD
= 3V, V
CM
= 1.5V
I
B
Input Bias Current
—
—
±100
pA
T
A
= 25°C
IN+, IN- = V
DD
to V
SS
V
OH
Output High Voltage
V
DD
– 0.3
—
—
V
R
L
= 10k
Ω
to V
SS
V
OL
Output Low Voltage
—
—
0.3
V
R
L
= 10k
Ω
to V
DD
CMRR
Common Mode Rejection Ratio
66
—
—
dB
T
A
= 25°C, V
DD
= 5V
V
CM
= V
DD
to V
SS
PSRR
Power Supply Rejection Ratio
60
—
—
dB
T
A
= 25°C, V
DD
= 1.8V to 5V
V
CM
= 1.2V
I
SRC
Output Source Current
1
—
—
mA
IN+ = V
DD
, IN- = V
SS
V
DD
= 1.8V,
Output Shorted to V
SS
I
SINK
Output Sink Current
2
—
—
mA
IN+ = V
SS
, IN- = V
DD,
V
DD
= 1.8V,
Output Shorted to V
DD
V
HYST
Voltage Range at HYST Pin
V
REF
– 0.08
—
V
REF
V
I
HYST
Hysteresis Input Current
—
—
±100
nA
t
PD1
Response Time
—
4
—
μ
sec
100mV Overdrive; C
L
= 100pF
t
PD2
Response Time
—
6
—
μ
sec
100mV Overdrive; C
L
= 100pF
Note
1:
V
OS
is measured as (V
UT
+ V
LT
– 2V
REF
)/2 where V
UT
is the upper hysteresis threshold and V
LT
is the lower hysteresis threshold with
V
REF
– V
HYST
set to 10mV. This represents the asymmetry of the hysteresis thresholds around V
REF
©
2005 Microchip Technology Inc.
DS21342C-page 3
TC1031
TC1031 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Typical values apply at 25°C and V
DD
= 3.0V; T
A
= -40° to +85°C, and V
DD
= 1.8V to 5.5V, unless
otherwise specified.
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
Voltage Reference
V
REF
Reference Voltage
1.176
1.200
1.224
V
I
REF(SOURCE)
Source Current
50
—
—
μ
A
I
REF(SINK)
Sink Current
50
—
—
μ
A
R
OUT
(SD)
Output Resistance in Shutdown
20
—
—
M
Ω
SHDN = V
SS
C
OUT
(SD)
Output Capacitance in Shutdown
—
—
5
pF
SHDN = V
SS
T
SEL
Select Time
—
200
—
μ
sec
REF Valid from SHDN = V
IH
R
L
= 100k
Ω
to V
SS
T
DESEL
Deselect Time
—
10
—
μ
sec
REF Invalid from SHDN = V
IL
R
L
= 100k
Ω
C
L(REF)
Load Capacitance
—
—
100
pF
E
VREF
Voltage Noise
—
20
—
μ
V
RMS
100Hz to 100kHz
e
VREF
Noise Density
—
10
—
μ
V/
√
Hz 1kHz
Note
1:
V
OS
is measured as (V
UT
+ V
LT
– 2V
REF
)/2 where V
UT
is the upper hysteresis threshold and V
LT
is the lower hysteresis threshold with
V
REF
– V
HYST
set to 10mV. This represents the asymmetry of the hysteresis thresholds around V
REF
TC1031
DS21342C-page 4
©
2005 Microchip Technology Inc.
2.0
PIN DESCRIPTIONS
The description of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin MSOP)
Symbol
Description
1
V
SS
Negative power supply.
2
SHDN
Shutdown input.
3
IN+
Comparator non-inverting input.
4
IN-
Comparator inverting input.
5
HYST
Adjustable hysteresis input.
6
V
REF
Voltage reference output.
7
V
DD
Positive power supply.
8
OUT
Comparator output.
©
2005 Microchip Technology Inc.
DS21342C-page 5
TC1031
3.0
DETAILED DESCRIPTION
The TC1031 is one of a series of very low-power, linear
building block products targeted at low-voltage, single-
supply applications. Minimum operating voltage for the
device is 1.8V, and typical supply current is only 6
μ
A
(fully enabled). It combines one comparator and a
voltage reference in a single package. The comparator
and reference outputs are in a high-impedance state
during shutdown.
3.1
Comparator
The TC1031 contains one comparator with program-
mable hysteresis. The range of the inputs extends
beyond both supply voltages by 200mV. The compara-
tor outputs will swing to within several millivolts of the
supplies depending on the load current being driven.
The comparator exhibits a propagation delay and
supply current which is largely independent of supply
voltage. The low input bias current and offset voltage
make it suitable for high impedance precision
applications.
The comparator is disabled during shutdown and has
high-impedance output.
3.2
Voltage Reference
A 2.0% tolerance, internally biased, 1.20V bandgap
voltage reference is included in the TC1031. It has a
push-pull output capable of sourcing and sinking at
least 50
μ
A. The voltage reference is disabled during
shutdown, with a high-impedance output.
3.3
Shutdown Input
SHDN at V
IL
disables both the comparator and voltage
reference and reduces the supply current to less than
0.1
μ
A. The SHDN input cannot be allowed to float;
when not used, connect it to V
DD
. The outputs are in a
high impedance state when the TC1031 is disabled.
The comparator’s inputs and output can be driven from
rail-to-rail by an external voltage when the TC1031 is
disabled. No latchup will occur when the device is
driven to its enabled state when SHDN is set to V
IH
.
3.4
Programmable Hysteresis
Hysteresis is added to the comparators by connecting
a resistor R1 between the V
REF
and HYST pins and
another resistor R2 between the HYST pin and V
SS
.
For no hysteresis V
REF
should be directly connected to
HYST. The hysteresis, V
HB
, is equal to twice the
voltage difference between the V
REF
and HYST pins,
where:
and is symmetrical around the normal (without
hysterersis) threshold of the comparator. The
maximum voltage allowed between the V
REF
and H
YST
pins is 80mV, giving a maximum hysteresis of 160mV.
FIGURE 3-1:
TC1031 PROGRAMMABLE HYSTERESIS
V
HB
= 2 * V
REF
* R1/(R1 + R2) (See Figure 3-1)
V
REF
HYST
V
SS
TC1031
6
5
1
R1
R2
I
REF
R1 =
V
HB
(2) (I
REF
)
R2 =
I
REF
(
1.200V –
)
V
HB
2
Note: Size R1 and R2 such that I
REF
≤ 50µA
TC1031
DS21342C-page 6
©
2005 Microchip Technology Inc.
4.0
TYPICAL APPLICATIONS
The TC1031 lends itself to a wide variety of
applications, particularly in battery-powered systems. It
typically finds application in power management,
processor supervisory and interface circuitry.
©
2005 Microchip Technology Inc.
DS21342C-page 7
TC1031
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.
7
6
5
4
3
2
1.5
2
2.5
3
3.5
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Comparator Propagation Delay
vs. Supply Voltage
DELAY TO RISING EDGE (
μ
sec)
Overdrive = 10mV
Overdrive = 50mV
7
6
5
4
3
2
1.5
2
2.5
3
3.5
4
4.5
5
5.5
DELAY TO FALLING EDGE (
μ
sec)
7
6
5
4
3
-40
°C
85
°C
25
°C
TEMPERATURE (
°C)
DELAY TO RISING EDGE (
μ
sec)
Overdrive = 100mV
Overdrive = 10mV
Overdrive = 50mV
Comparator Propagation Delay
vs. Supply Voltage
Comparator Propagation Delay
vs. Temperature
T
A
= 25°C
C
L
= 100pF
T
A
= 25°C
C
L
= 100pF
Overdrive = 100mV
V
DD
= 4V
V
DD
= 5V
V
DD
= 2V
V
DD
= 3V
-40
°C
85
°C
25
°C
2.5
2.0
1.5
1.0
.5
0
0
1
2
3
4
5
6
V
DD
- V
OUT
(V)
I
SOURCE
(mA)
7
6
5
4
3
Comparator Output Swing
vs. Output Source Current
DELAY TO FALLING EDGE (
μ
sec)
Overdrive = 100mV
2.5
2.0
1.5
1.0
.5
0
0
1
2
3
4
5
Comparator Propagation Delay
vs. Temperature
Comparator Output Swing
vs. Output Sink Current
TEMPERATURE (
°C)
I
SINK
(mA)
V
DD
= 4V
V
DD
= 5V
V
DD
= 2V
V
DD
= 3V
T
A
= 25°C
T
A
= 25°C
V
DD
= 3V
V
DD
= 1.8V
V
DD
= 5.5V
V
DD
= 3V
V
DD
= 1.8V
V
DD
= 5.5V
V
OUT
- V
SS
(V)
6
60
50
Sinking
40
30
20
10
0
0
1
2
3
4
5
6
OUTPUT SHORT-CIRCUIT CURRENT (mA)
SUPPLY VOLTAGE (V)
Comparator Output Short-Circuit
Current vs. Supply Voltage
Sourcing
T
A
= -40
°C
T
A
= -40
°C
T
A
= 25
°C
T
A
= 85
°C
T
A
= 25
°C
T
A
= 85
°C
REFERENCE VOLTAGE (V)
1.240
1.220
1.200
1.180
1.160
1.140
0
2
4
6
8
10
LOAD CURRENT (mA)
Reference Voltage vs.
Load Current
V
DD
= 1.8V
V
DD
= 3V
V
DD
= 5.5V
Sinking
Sourcing
V
DD
= 1.8V
V
DD
= 3V
V
DD
= 5.5V
4
3
2
1
0
0
100
200
300
400
SUPPLY AND REFERENCE VOLTAGES (V)
TIME (
μsec)
Line Transient
Response of V
REF
V
DD
V
REF
TC1031
DS21342C-page 8
©
2005 Microchip Technology Inc.
5.0
TYPICAL CHARACTERISTICS (CONTINUED)
1.25
1.20
1.15
1.10
1.05
1
2
3
4
5
REFERENCE VOLTAGE (V)
0
1
2
3
4
5
6
SUPPLY CURRENT
(μ
A)
SUPPLY VOLTAGE (V)
Supply Current vs. Supply Voltage
T
A
= 85
°C
T
A
= -40
°C
T
A
= 25
°C
Reference Voltage
vs. Supply Voltage
SUPPLY VOLTAGE (V)
8
7
6
5
4
3
2
©
2005 Microchip Technology Inc.
DS21342C-page 9
TC1031
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
Package marking data not available at this time.
6.2
Taping Form
6.3
Package Dimensions
Component Taping Orientation for 8-Pin MSOP Devices
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
Carrier Tape, Number of Components Per Reel and Reel Size
PIN 1
User Direction of Feed
Standard Reel Component Orientation
for TR Suffix Device
W
P
8-Pin MSOP
.122 (3.10)
.114 (2.90)
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.006 (0.15)
.002 (0.05)
.016 (0.40)
.010 (0.25)
.197 (5.00)
.189 (4.80)
.008 (0.20)
.005 (0.13)
.028 (0.70)
.016 (0.40)
6
° MAX.
.026 (0.65) TYP.
PIN 1
Dimensions: inches (mm)
TC1031
DS21342C-page 10
©
2005 Microchip Technology Inc.
NOTES: