LT6700HVHS6-1-TRMPBF datasheet(14/20 Pages) LINER

Part #	LT6700HVHS6-1-TRMPBF

Description	Micropower, Low Voltage, Dual Comparator with 400mV Reference

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Manufacturer	LINER [Linear Technology]

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LT6700-1/LT6700-2/LT6700-3/

LT6700HV-1/LT6700HV-2/

LT6700HV-3

14

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APPLICATIONS INFORMATION

The LT6700-1/LT6700-2/LT6700-3/LT6700HV-1/

LT6700HV-2/LT6700HV-3 devices are a family of dual

micropower comparators with a built-in 400mV refer-

ence. Features include wide supply voltage range (1.4V to

18V), Over-The-Top input and output range, 2% accurate

rising input threshold voltage and 6.5mV typical built-in

hysteresis. The comparator’s open-collector outputs can

sink up to 40mA typical.

Internal Reference

Each of the comparator sections has one input available

externally, with the three versions of the part differing by

the polarity of those available inputs (i.e., inverting or

noninverting). The other comparator inputs are connected

internally to the 400mV reference. The rising input threshold

voltage of the comparators is designed to be equal to that

of the reference (i.e., ≈ 400mV). The reference voltage is

established with respect to the device GND connection.

Hysteresis

Each comparator has built-in 6.5mV (typical) hysteresis to

simplify designs, ensure stable operation in the presence

of noise at the inputs, and to reject supply rail noise that

might be induced by state change load transients. The

hysteresis is designed such that the falling input threshold

voltage is nominally 393.5mV. External positive feedback

circuitry can be employed with noninverting comparator

inputs to increase effective hysteresis if desired, but such

circuitry will provide an apparent effect on both the rising

and falling input thresholds (the actual internal thresholds

remain unaffected).

Comparator Inputs

A comparator input can swing from ground to 18V (36V

for LT6700HV), regardless of the supply voltage used. The

typical input current for inputs well above threshold (i.e.,

>800mV) is a few pA leaking into an input. With decreasing

input voltage, a small bias current begins to be drawn out

of the input, reaching a few nA when at ground potential.

The input may be forced 100mV below ground without

causing an improper output, though some additional bias

current will begin to ﬂow from the parasitic ESD input pro-

tection diode. Inputs driven further negative than 100mV

below ground will not cause comparator malfunction or

damage (provided the current is limited to 10mA), but

the accuracy of the reference cannot be guaranteed, in

which case the output state of the alternate comparator

may be affected.

Comparator Outputs

The comparator outputs are open collector and capable

of sinking 40mA typical. Load currents are directed out

the GND pin of the part. The output off-state voltage may

range between –0.3V and 18V (36V for LT6700HV) with

respect to ground, regardless of the supply voltage used.

When the output high state bias voltage is above 18V, a

100k minimum pull-up resistor is required and total load

capacitor must be less than 100nF. If the output high state

is above 18V, caution must be taken to prevent a short

from the output directly to the bias voltage, even if the

output is in the off state. As with any open-collector device,

the outputs may be tied together to implement wire-AND

logic functions.

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