MICROCHIP TC1041CEOA

TC1041
Linear Building Block – Dual Low Power Comparator and
Voltage Reference with Programmable Hysteresis
Features
General Description
• Combines Two Comparators and a Voltage
Reference in a Single Package
• Optimized for Single Supply Operation
• Available in Two Small Packages: 8-Pin SOIC or
8-Pin MSOP
• Ultra Low Input Bias Current: Less than 100pA
• Low Quiescent Current, Operating: 10µA (Typ.)
• Rail-to-Rail Inputs and Outputs
• Operates Down to VDD = 1.8V
• Programmable Hysteresis
The TC1041 is a mixed-function device combining two
comparators and a voltage reference in a single 8-pin
package. The inverting inputs of both comparators are
internally connected to the reference.
Applications
•
•
•
•
Power Supply Circuits
Battery Operated Equipment
Consumer Products
Replacements for Discrete Components
Device Selection Table
Part Number
Package
Temperature
Range
TC1041CEOA
8-Pin SOIC
-40°C to +85°C
TC1041CEUA
8-Pin MSOP
-40°C to +85°C
This increased integration allows the user to replace
two packages, which saves space, lowers supply
current and increases system performance. The
TC1041 operates from two 1.5V alkaline cells down to
VDD = 1.8V. It requires only 10µA typical supply current
which significantly extends battery life. The TC1041
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 pin.
Rail-to-rail inputs and outputs allow operation from low
supply voltages with large input and output signal
swings.
Packaged in an 8-Pin SOIC or 8-Pin MSOP, the
TC1041 is ideal for applications requiring low power
and small packages.
Functional Block Diagram
OUTA
TC1041
1
8
OUTB
Package Types
VSS
OUTA
VSS
1
7
INA+
3
INB-
4
TC1041CEOA
TC1041CEUA
 2002 Microchip Technology Inc.
A
+
8
2
2
OUTB
VDD
6
REF
5
HYST
INA+
7
B
–
+
8-Pin SOIC
8-Pin MSOP
–
6
3
VDD
REF
Voltage
Reference
INB+
5
4
HYST
VSS
DS21346B-page 1
TC1041
1.0
ELECTRICAL
CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage ......................................................6.0V
Voltage on Any Pin .......... (V SS – 0.3V) to (VDD + 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.
TC1041 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Typical values apply at 25°C and VDD = 3.0V. Minimum and maximum values apply for TA = -40° to
+85°C and VDD = 1.8V to 5.5V, unless otherwise specified.
Symbol
Parameter
Min
Typ
Max
Units
VDD
Supply Voltage
1.8
—
5.5
V
IQ
Supply Current Operating
—
10
15
µA
Test Conditions
All Outputs Open
Comparators
VIR
IN+ Voltage Range
VSS – 0.2
—
VDD + 0.2
V
V OS
Input Offset Voltage
-5
-5
—
+5
+5
mV
mV
VDD = 3V, TA = 25°C
TA = -40°C to 85°C (Note 1)
IB
Input Bias Current
—
—
±100
pA
TA = 25°C,
IN+ = VDD to VSS
VOH
Output High Voltage
VDD – 0.3
—
—
V
RL = 10kΩ to VSS
VOL
Output Low Voltage
—
—
0.3
V
RL = 10kΩ to VDD
CMRR
Common Mode Rejection Ratio
66
—
—
dB
TA = 25°C, VDD = 5V
VCM = VDD to VSS
PSRR
Power Supply Rejection Ratio
60
—
—
dB
TA = 25°C
VDD = 1.8V to 5V
ISRC
Output Source Current
1
—
—
mA
IN+ = VDD ,
Output Shorted to VSS
VDD = 1.8V
ISINK
Output Sink Current
2
—
—
mA
IN+ = VSS,
Output Shorted to VDD
VDD = 1.8V
V HYST
Voltage Range at HYST Pin
VREF – 0.08
—
VREF
V
IHYST
Hysteresis Input Current
—
—
±100
nA
tPD1
Response Time
—
4
—
µsec
100mV Overdrive, C L = 100pF
tPD2
Response Time
—
6
—
µsec
10mV Overdrive, CL = 100pF
1.176
1.200
1.224
V
50
—
—
µA
50
—
—
µA
Voltage Reference
Reference Voltage
V REF
IREF(SOURCE) Source Current
IREF(SINK)
Sink Current
CL(REF)
Load Capacitance
—
—
100
pF
E VREF
Noise Voltage
—
20
—
µVRMS
100Hz to 100kHz
eVREF
Noise Voltage Density
—
1.0
—
µV/√Hz
1kHz
Note
1:
VOS is measured as (VUT + VLT – 2VREF )/2 where VUT is the upper hysteresis threshold and VLT is the lower hysteresis threshold with
VREF – VHYST set to 10mV. This represents the assymetry of the hysteresis thresholds around VREF.
DS21346B-page 2
 2002 Microchip Technology Inc.
TC1041
2.0
PIN DESCRIPTION
The description of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin SOIC)
(8-Pin MSOP)
Symbol
1
OUTA
Description
Comparator output.
Negative power supply.
2
VSS
3
INA+
Non-inverting input to Comparator A.
4
INB-
Non-Inverting input to Comparator B.
5
HYST
6
REF
Voltage reference output.
7
VDD
Positive power supply.
8
OUTB
 2002 Microchip Technology Inc.
Adjustable hysteresis input.
Comparator output.
DS21346B-page 3
TC1041
3.0
DETAILED DESCRIPTION
3.2
A 2.0 percent tolerance, internally biased, 1.20V bandgap voltage reference is included in the TC1041. It has
a push-pull output capable of sourcing and sinking at
least 50µA.
The TC1041 is one of a series of very low power, linear
building block products targeted at low voltage
operation. The TC1041 contains two comparators and
a voltage reference and operates at a minimum supply
voltage of 1.8V with a typical current consumption of
10µA. Both comparators have programmable
hysteresis.
3.1
3.3
Programmable Hysteresis
Hysteresis is added to the comparators by connecting
a resistor, R1, between the VREF and HYST pins and
another resistor, R2, between the HYST pin and VSS.
For no hysteresis, VREF should be directly connected to
HYST. The hysteresis, VHB, is equal to twice the
voltage difference between the VREF and HYST pins
where:
Comparator
The TC1041 contains two comparators with programmable hysteresis. The inverting inputs of the
comparators are connected to the output of the voltage
reference, while the range of the non-inverting inputs
extend beyond both supply voltages by 200mV. The
comparator outputs will swing to within several
millivolts of the supplies depending on the load current
being driven.
VHB = 2V REF R1/(R1 + R2) (See Figure 3-1)
and is symmetrical around the normal (without
hysterersis) threshold of the comparator. The
maximum voltage allowed between the VREF and HYST
pins is 80mV, giving a maximum hysteresis of 160mV.
The comparators exhibit a propagation delay and
supply current which are largely independent of supply
voltage. The low input bias current and offset voltage
make them suitable for high impedance precision
applications.
FIGURE 3-1:
Voltage Reference
TC1041 PROGRAMMABLE HYSTERESIS
6
VREF
R1 =
R1
IREF
5
R2 =
HYST
VHB
(2) (IREF)
(1.2V –
VHB
2
)
IREF
R2
1
VSS
TC1041
Note: Size R1 and R2 such that IREF ≤ 50µA
DS21346B-page 4
 2002 Microchip Technology Inc.
TC1041
4.0
TYPICAL APPLICATIONS
The circuit in Figure 4-1 uses a TC1034, a TC1041 and
only six external resistors. AMP 1 is a simple buffer
while CMPTR1 and CMPTR2 provide precision voltage
detection using VREF as a reference. Resistors R2 and
R4 set the detection threshold for BATT LOW while
Resistors R1 and R3 set the detection threshold for
BATT FAIL. The component values shown assert
BATT LOW at 2.2V (typical) and BATT FAIL at 2.0V
(typical). Total current consumed by this circuit is
typically 16µA at 3V. Resistors R5 and R6 provide
hysteresis of 116mV for both comparators.
The TC1041 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.
4.1
Precision Battery Monitor
Figure 4-1 is a precision battery low/battery dead
monitoring circuit. Typically, the battery low output
warns the user that a battery dead condition is
imminent. Battery dead typically initiates a forced
shutdown to prevent operation at low internal supply
voltages (which can cause unstable system operation).
FIGURE 4-1:
PRECISION BATTERY MONITOR
To System DC/DC
Converter
R4, 470k, 1%
VDD
VDD
TC1034
+
R2, 430k, 1%
+
AMP1
–
3V
Alkaline
CMPTR1
–
TC1041
BATTLOW
+
VDD
TC1041
R5
51k
R6
1M
R1, 300k, 1%
VREF
HYST
–
TC1041
CMPTR2
BATTFAIL
+
R3, 470k, 1%
 2002 Microchip Technology Inc.
DS21346B-page 5
TC1041
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.
Comparator Propagation Delay
vs. Supply Voltage
7
TA = 25°C
CL = 100pF
DELAY TO FALLING EDGE (µsec)
6
Overdrive = 10mV
5
4
Overdrive = 50mV
3
2
6
Overdrive = 10mV
5
Overdrive = 100mV
Overdrive = 50mV
4
3
2
2.5
3
3.5
4
4.5
5
1.5
5.5
2
6
VDD = 5V
5
VDD = 4V
VDD = 2V
4
VDD = 3V
2.5
3
3.5
4
4.5
5
5.5
-40°C
2.5
2.5
TA = 25°C
Overdrive = 100mV
VDD = 4V
VDD = 3V
VDD = 2V
4
VOUT - VSS (V)
VDD - VOUT (V)
VDD = 5V
TA = 25°C
2.0
2.0
6
85°C
Comparator Output Swing
vs. Output Sink Current
Comparator Output Swing
vs. Output Source Current
7
25°C
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
Comparator Propagation Delay
vs. Temperature
5
Overdrive = 100mV
3
SUPPLY VOLTAGE (V)
DELAY TO FALLING EDGE (µsec)
7
TA = 25°C
CL = 100pF
2
1.5
VDD = 3V
1.5
VDD = 1.8V
1.0
VDD = 5.5V
.5
1.5
VDD = 3V
1.0
VDD = 1.8V
.5
VDD = 5.5V
3
-40°C
0
0
25°C
0
85°C
3
2
4
ISOURCE (mA)
1
TEMPERATURE (°C)
Comparator Output Short-Circuit
Current vs. Supply Voltage
5
TA = -40°C
50
TA = 25°C
40
TA = 85°C
C
0°
30
TA
20
Sinking
10
Sourcing
0
0
=
-4
TA = 25°C
TA = 85°C
3
1
2
4
5
SUPPLY VOLTAGE (V)
DS21346B-page 6
VDD = 1.8V
VDD = 3V
1.220
VDD = 5.5V
Sinking
1.200
Sourcing
1.180
VDD = 5.5V
1.160
VDD = 1.8V
VDD = 3V
1.140
6
0
2
4
6
1
2
3
4
5
6
ISINK (mA)
1.240
60
0
6
Reference Voltage vs.
Load Current
REFERENCE VOLTAGE (V)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
Comparator Propagation Delay
vs. Temperature
8
LOAD CURRENT (mA)
10
SUPPLY AND REFERENCE VOLTAGES (V)
DELAY TO RISING EDGE (µsec)
7
Comparator Propagation Delay
vs. Supply Voltage
DELAY TO RISING EDGE (µsec)
5.0
Line Transient
Response of VREF
4
VDD
3
2
VREF
1
0
0
100
200
300
400
TIME (µsec)
 2002 Microchip Technology Inc.
TC1041
5.0
TYPICAL CHARACTERISTICS (CONTINUED)
Reference Voltage
vs. Supply Voltage
Supply Current vs. Supply Voltage
12
SUPPLY CURRENT (µA)
REFERENCE VOLTAGE (V)
1.25
1.20
1.15
1.10
11
TA = 85°C
10
TA = -40°C
9
TA = 25°C
8
7
1.05
6
1
4
2
3
SUPPLY VOLTAGE (V)
 2002 Microchip Technology Inc.
5
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
6
DS21346B-page 7
TC1041
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
Package marking data not available at this time.
6.2
Taping Form
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
8-Pin MSOP
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
12 mm
8 mm
2500
13 in
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
8-Pin SOIC (N)
DS21346B-page 8
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
12 mm
8 mm
2500
13 in
 2002 Microchip Technology Inc.
TC1041
6.3
Package Dimensions
8-Pin MSOP
PIN 1
.122 (3.10)
.114 (2.90)
.197 (5.00)
.189 (4.80)
.026 (0.65) TYP.
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.016 (0.40)
.010 (0.25)
.008 (0.20)
.005 (0.13)
6° MAX.
.006 (0.15)
.002 (0.05)
.028 (0.70)
.016 (0.40)
Dimensions: inches (mm)
8-Pin SOIC
PIN 1
.157 (3.99)
.150 (3.81)
.244 (6.20)
.228 (5.79)
.050 (1.27) TYP.
.197 (5.00)
.189 (4.80)
.069 (1.75)
.053 (1.35)
.020 (0.51) .010 (0.25)
.013 (0.33) .004 (0.10)
.010 (0.25)
.007 (0.18)
8° MAX..
.050 (1.27)
.016 (0.40)
Dimensions: inches (mm)
 2002 Microchip Technology Inc.
DS21346B-page 9
TC1041
NOTES:
DS21346B-page 10
 2002 Microchip Technology Inc.
TC1041
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.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
 2002 Microchip Technology Inc.
DS21346B-page11
TC1041
NOTES:
DS21346B-page12
 2002 Microchip Technology Inc.
TC1041
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.
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© 2002, Microchip Technology Incorporated, Printed in the
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 2002 Microchip Technology Inc.
DS21346B-page 13
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03/01/02
*DS21346B*
DS21346B-page 14
 2002 Microchip Technology Inc.