TC1041

DS21346B-page 4

© 2002 Microchip Technology Inc.

3.0

DETAILED DESCRIPTION

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

10

µA.

Both

comparators

have

programmable

hysteresis.

3.1

Comparator

The TC1041 contains two comparators with program-

mable

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.

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.

3.2

Voltage Reference

A 2.0 percent tolerance, internally biased, 1.20V band-

gap voltage reference is included in the TC1041. It has

a push-pull output capable of sourcing and sinking at

least 50

µA.

3.3

Programmable Hysteresis

Hysteresis is added to the comparators by connecting

where:

and is symmetrical around the normal (without

hysterersis)

threshold

of

the

comparator.

The

pins is 80mV, giving a maximum hysteresis of 160mV.

FIGURE 3-1:

TC1041 PROGRAMMABLE HYSTERESIS

HYST

TC1041

6

5

1

R1

R2

R1 =

R2 =

)

2