LMX331AXK+T Maxim Integrated Products, LMX331AXK+T Datasheet - Page 7

• Manufacturer Part Number: LMX331AXK+T
• Description: IC COMPARATOR GP SNGL SC70-5
• Manufacturer: Maxim Integrated Products
• Type: General Purposer

Specifications of LMX331AXK+T

• Number Of Elements: 1
• Output Type: Open Drain
• Voltage - Supply: 1.8 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 6-TSSOP (5 lead), SC-88A, SOT-353
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMX331AXK+T; LMX331AXK+TTR

The LMX331/LMX393/LMX339 are single/dual/quad,
low-cost, general-purpose comparators. They have a
single-supply operating voltage of 1.8V to 5V. The com-
mon-mode input range extends from -0.1V below the
negative supply to within 0.7V of the positive supply.
They require approximately 60µA per comparator with
a 5V supply and 40µA with a 2.7V supply.
The LMX331H/LMX393H/LMX339H have 2mV of hys-
teresis for noise immunity. This significantly reduces the
chance of output oscillations even with slow-moving
input signals. The LMX331/LMX393/LMX339 and
LMX331H/LMX393H/LMX339H are ideal for automotive
applications because they operate from -40°C to
+125°C (see Typical Operating Characteristics).
Many comparators oscillate in the linear region of oper-
ation because of noise or undesired parasitic feed-
back. This tends to occur when the voltage on one
input is equal or very close to the voltage on the other
input. The LMX331H/LMX393H/LMX339H have internal
hysteresis to counter parasitic effects and noise.
The hysteresis in a comparator creates two trip points:
one for the rising input voltage and one for the falling
LMX331
—
—
—
—
—
—
—
—
—
—
—
—
1
2
3
4
5
LMX393
Single/Dual/Quad, Tiny-Pack Comparators
Applications Information
—
—
—
—
—
—
—
—
—
4
8
1
7
2
3
5
6
PIN
_______________________________________________________________________________________
Detailed Description
LMX339
12
10
11
13
14
—
—
—
3
2
1
4
5
7
6
8
9
General-Purpose, Low-Voltage,
Hysteresis
NAME
OUTA
OUTB
OUTD
OUTC
INC+
IND+
INA+
INB+
OUT
INA-
INB-
INC-
IND-
V
V
IN+
IN-
DD
SS
Noninverting Input
Negative Supply (Connect to GND)
Inverting Input
Comparator Output (Open-Drain)
Positive Supply
Comparator A Output (Open-Drain)
Comparator B Output (Open-Drain)
Comparator A Inverting Input
Comparator A Noninverting Input
Comparator B Noninverting Input
Comparator B Inverting Input
Comparator C Inverting Input
Comparator C Noninverting Input
Comparator D Inverting Input
Comparator D Noninverting Input
Comparator D Output (Open-Drain)
Comparator C Output (Open-Drain)
input voltage (Figure 1). The difference between the trip
points is the hysteresis. When the comparator's input
voltages are equal, the hysteresis effectively causes
one comparator input to move quickly past the other,
thus taking the input out of the region where oscillation
occurs. This provides clean output transitions for noisy,
slow-moving input signals.
Additional hysteresis can be generated with two resis-
tors, using positive feedback (Figure 2). Use the follow-
ing procedure to calculate resistor values:
Figure 1. Threshold Hysteresis Band (Not to Scale)
IN+
IN-
OUT
V
HYST
FUNCTION
THRESHOLDS
HYSTERESIS
BAND
Pin Description
V
V
TH
TL
7