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2. When IN- is higher than the specified input voltage range and IN+ is within the specified voltage range, the

output is low.

3. When IN+ is higher than the specified input voltage range and IN- is within the specified input voltage range,

the output is high

4. When IN- and IN+ are both outside the specified input voltage range, the output is indeterminate (random).

Do not operate in this region.

Even with the fault tolerant feature, TI strongly recommends keeping the inputs within the specified input voltage

range during normal system operation to maintain datasheet specifications. Operating outside the specified input

range can cause changes in specifications such as propagation delay and input bias current, which can lead to

unpredictable behavior.

7.4.3.3 Input Protection

The input bias current is typically 5 pA for input voltages between V+ and V-. The comparator inputs are

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

V-, or above the input Absolute Maximum ratings the protection diodes become forward biased and begin to

conduct causing the input bias current to increase exponentially. Input bias current typically doubles for each

10°C temperature increase.

If the inputs are to be connected to a low impedance source, such as a power supply or buffered reference line,

TI recommends adding a current-limiting resistor in series with the input to limit any transient currents should the

clamps conduct. The current should be limited 10 mA or less. This series resistance can be part of any resistive

input dividers or networks.

7.4.4 ESD Protection

The TLV90xx family incorporates internal ESD protection circuits on all pins. The inputs, and the open-drain

output, use a proprietary "snapback" type ESD clamp from each pin to V-, which allows the pins to exceed the

supply voltage (V+). While shown as Zener diodes, snapback "short" and go low impedance (like an SCR) when

the threshold is exceeded, as opposed to clamping to a defined voltage like a Zener.

The TLV902x open-drain output protection also consists of a ESD clamp between the output and V- to allow the

output to be pulled above V+ to a maximum of 5.5V.

The TLV903x push-pull output protection consists of a ESD clamp between the output and V-, but also includes

a ESD diode clamp to V+, as the output must not exceed the supply rails.

If the inputs are to be connected to a low impedance source, such as a power supply or buffered reference line,

TI recommends adding a current-limiting resistor in series with the input to limit any transient currents must the

clamps conduct. The current must be limited 10 mA or less. This series resistance can be part of any resistive

input dividers or networks. TI does not specify the performance of the ESD clamps and external clamping must

be added if the inputs or output could exceed the maximum ratings as part of normal operation.

7.4.5 Unused Inputs

If a channel is not to be used, DO NOT tie the inputs together. Due to the high equivalent bandwidth and low

offset voltage, tying the inputs directly together can cause high frequency oscillations as the device triggers on

it's own internal wideband noise. Instead, the inputs must be tied to any available voltage that resides within the

specified input voltage range and provides a minimum of 50mV differential voltage. For example, one input can

be grounded and the other input connected to a reference voltage, or even V+ as long as the input is directly

connected to the V+ pin to avoid transients).

7.4.6 Hysteresis

The TLV90xx family does not have internal hysteresis. Due to the wide effective bandwidth and low input offset

voltage, it is possible for the output to "chatter" (oscillate) when the absolute differential voltage near zero as the

comparator triggers on it's own internal wideband noise. This is normal comparator behavior and is expected. TI

recommends that the user add external hysteresis if slow moving signals are expected. See Section 8.1.2 in the

following section.

TLV9020, TLV9021, TLV9022, TLV9024, TLV9030, TLV9031, TLV9032, TLV9034

SNOSDA3F – JUNE 2020 – REVISED MARCH 2023

www.ti.com

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TLV9022 Datasheet(PDF) 22 Page - Texas Instruments

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