V

+ V

(V

-

TH

OS

HYST

)

/ 2

V

+ V

TH

OS

V

+ V

+

TH

OS

(V

HYST

)

/ 2

11

TLV7081

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SNOSD69A – MAY 2018 – REVISED JUNE 2018

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Device Functional Modes (continued)

7.4.1 Inputs

The TLV7081 input extends from V- to 5.6 V which is independent of supply. The input IN can be any voltage

within these limits and no phase inversion of the comparator output occurs.

The input of TLV7081 is fault tolerant. It maintains the same high input impedance when V+ is unpowered or

ramping up. The input can be safely driven up to the specified maximum voltage (5.6 V) with V+ = 0 V or any

value up to the maximum specified.

The input bias current is typically 3 pA for input IN voltages between 0 and 5.6 V. The comparator inputs are

protected from undervoltage by internal diodes connected to V-. As the input voltage goes under V-, the

protection diodes become forward biased and begin to conduct causing the input bias current to increase

exponentially. Input bias current typically doubles for every 10°C temperature increase.

7.4.2 Internal Hysteresis

The device hysteresis transfer curve is shown in Figure 20. This curve is a function of three components: VTH,

VOS, and VHYST:

•

VTH is the actual set voltage or threshold trip voltage.

•

VOS is the internal offset voltage between IN and V+. This voltage is added to VTH to form the actual trip point

at which the comparator must respond to change output states.

•

VHYST is the internal hysteresis (or trip window) that is designed to reduce comparator sensitivity to noise

(10 mV typical).

Figure 20. Hysteresis Transfer Curve

7.4.3 Output

The TLV7081 features an open-drain output stage enabling the output logic levels to be pulled up to an external

source up to 5.5 V independently of the supply voltage.