2002 Microchip Technology Inc.

DS21342B-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

A (Typ.),

Shutdown Mode: 0.1

A (Typ.)

· Rail-to-Rail Inputs and Outputs

· Operates Down to V

= 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

= 1.8V.

Typical active supply current is 6

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

(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

REF

HYST

TC1031CEUA

INA+

INA

OUT

8-Pin MSOP

SHDN

IN+

REF

IN-

HYST

OUT

Voltage

Reference

TC1031

Linear Building Block Low Power Voltage Reference with

Programmable Hysteresis Comparator and Shutdown

TC1031

DS21342B-page 2

2002 Microchip Technology Inc.

1.0

ELECTRICAL
CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage ......................................................6.0V

Voltage on Any Pin .......... (V

0.3V) to (V

+ 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

= 3.0V; T

= -40° to +85°C, and V

= 1.8V to 5.5V, unless

otherwise specified.

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

Supply Voltage

1.8

5.5

Supply Current, Operating

All Outputs Open, SHDN = V

SHDN

Supply Current, Shutdown

0.1

SHDN = V

Shutdown Input

Input High Threshold

80% V

Input Low Threshold

20% V

Shutdown Input Current

±100

Comparator

OUT

(SD)

Output Resistance in Shutdown

SHDN = V

OUT

(SD)

Output Capacitance in Shutdown

SHDN = V

SEL

Select Time

sec

OUT

Valid from SHDN = V

=10k

to V

DESEL

Deselect Time

500

nsec

OUT

Invalid from SHDN = V

=10k

to V

ICMR

Common-Mode Input Voltage Range

0.2

+ 0.2

Input Offset Voltage (Note 1)

= 3V, V

= 1.5V

Input Bias Current

±100

= 25°C

IN+, IN- = V

to V

Output High Voltage

0.3

= 10k

to V

Output Low Voltage

0.3

= 10k

to V

CMRR

Common Mode Rejection Ratio

= 25°C, V

= 5V

= V

to V

PSRR

Power Supply Rejection Ratio

= 25°C, V

= 1.8V to 5V

= 1.2V

SRC

Output Source Current

IN+ = V

, IN- = V

= 1.8V,

Output Shorted to V

SINK

Output Sink Current

IN+ = V

, IN- = V

DD,

= 1.8V,

Output Shorted to V

HYST

Voltage Range at HYST Pin

REF

0.08

REF

HYST

Hysteresis Input Current

±100

PD1

Response Time

sec

100mV Overdrive; C

= 100pF

PD2

Response Time

sec

100mV Overdrive; C

= 100pF

Note

is measured as (V

+ V

REF

)/2 where V

is the upper hysteresis threshold and V

is the lower hysteresis threshold with

REF

HYST

set to 10mV. This represents the asymmetry of the hysteresis thresholds around V

REF

2002 Microchip Technology Inc.

DS21342B-page 3

TC1031

TC1031 ELECTRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: Typical values apply at 25°C and V

= 3.0V; T

= -40° to +85°C, and V

= 1.8V to 5.5V, unless

otherwise specified.

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

Voltage Reference

REF

Reference Voltage

1.176

1.200

1.224

REF(SOURCE)

Source Current

REF(SINK)

Sink Current

OUT

(SD)

Output Resistance in Shutdown

SHDN = V

OUT

(SD)

Output Capacitance in Shutdown

SHDN = V

SEL

Select Time

200

sec

REF Valid from SHDN = V

= 100k

to V

DESEL

Deselect Time

sec

REF Invalid from SHDN = V

= 100k

L(REF)

Load Capacitance

100

VREF

Voltage Noise

RMS

100Hz to 100kHz

VREF

Noise Density

Hz 1kHz

Note

is measured as (V

+ V

REF

)/2 where V

is the upper hysteresis threshold and V

is the lower hysteresis threshold with

REF

HYST

set to 10mV. This represents the asymmetry of the hysteresis thresholds around V

REF

2002 Microchip Technology Inc.

DS21342B-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

(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

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

A. The voltage reference is disabled during

shutdown, with a high-impedance output.

3.3

Shutdown Input

SHDN at V

disables both the comparator and voltage

reference and reduces the supply current to less than
0.1

A. The SHDN input cannot be allowed to float;

when not used, connect it to V

. 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

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

For no hysteresis V

REF

should be directly connected to

HYST. The hysteresis, V

, is equal to twice the

voltage difference between the V

REF

and HYST pins,

where:

and is symmetrical around the normal (without
hysterersis)

threshold

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

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.

= 2 * V

REF

* R1/(R1 + R2) (See Figure 3-1)

REF

HYST

TC1031

REF

R1 =

(2) (I

REF

)

R2 =

REF

(

1.200V

)

Note: Size R1 and R2 such that I

REF

50µA

TC1031

DS21342B-page 6

2002 Microchip Technology Inc.

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.

1.5

2.5

3.5

4.5

5.5

SUPPLY VOLTAGE (V)

Comparator Propagation Delay

vs. Supply Voltage

DELAY TO RISING EDGE (

sec)

Overdrive = 10mV

Overdrive = 50mV

1.5

2.5

3.5

4.5

5.5

DELAY TO FALLING EDGE (

sec)

-40

°C

TEMPERATURE (

°C)

DELAY TO RISING EDGE (

sec)

Overdrive = 100mV

Overdrive = 10mV

Overdrive = 50mV

Comparator Propagation Delay

vs. Supply Voltage

Comparator Propagation Delay

vs. Temperature

= 25°C

= 100pF

= 25°C

= 100pF

Overdrive = 100mV

= 4V

= 5V

= 2V

= 3V

-40

°C

2.5

2.0

1.5

1.0

- V

OUT

(V)

SOURCE

(mA)

Comparator Output Swing
vs. Output Source Current

DELAY TO FALLING EDGE (

sec)

Overdrive = 100mV

2.5

2.0

1.5

1.0

Comparator Propagation Delay

vs. Temperature

Comparator Output Swing

vs. Output Sink Current

TEMPERATURE (

°C)

SINK

(mA)

= 4V

= 5V

= 2V

= 3V

= 25°C

= 3V

= 1.8V

= 5.5V

= 3V

= 1.8V

= 5.5V

OUT

- V

(V)

Sinking

OUTPUT SHORT-CIRCUIT CURRENT (mA)

SUPPLY VOLTAGE (V)

Comparator Output Short-Circuit

Current vs. Supply Voltage

Sourcing

= -40

= 25

= 85

= 25

= 85

REFERENCE VOLTAGE (V)

1.240

1.220

1.200

1.180

1.160

1.140

LOAD CURRENT (mA)

Reference Voltage vs.

Load Current

= 1.8V

= 3V

= 5.5V

Sinking

Sourcing

= 1.8V

= 3V

= 5.5V

100

200

300

400

SUPPLY AND REFERENCE VOLTAGES (V)

TIME (

µsec)

Line Transient

Response of V

REF

2002 Microchip Technology Inc.

DS21342B-page 11

TC1031

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 com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.

Trademarks

The Microchip name and logo, the Microchip logo, FilterLab,
K

, microID,

MPLAB, PIC, PICmicro, PICMASTER,

PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.

dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.

Serialized Quick Turn Programming (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.

Printed on recycled paper.

Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company's quality system processes and
procedures are QS-9000 compliant for its
PICmicro

8-bit MCUs, K

code hopping

devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip's quality system for the
design and manufacture of development
systems is ISO 9001 certified.

DS21342B-page 12

2002 Microchip Technology Inc.

AMERICAS

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03/01/02

*DS21342B*

ORLDWIDE

ALES

AND

ERVICE

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