Low-Cost, Ultra-Small, Single/Dual/Quad
Single-Supply Comparators
Pin Description
PIN
MAX9032
NAME
FUNCTION
MAX9030
MAX9031
MAX9034
1
2
1
—
4
—
11
—
—
—
4
IN+
Comparator Noninverting Input
2
V
Negative Supply Voltage. Bypass with a 0.1µF capacitor.
Comparator Inverting Input
Comparator Output
SS
3
3
—
—
—
8
IN-
4
4
OUT
5
—
5
SHDN
Shutdown
6
V
Positive Supply Voltage. Bypass with a 0.1µF capacitor.
Comparator A Output
DD
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1
1
OUTA
INA-
2
2
Comparator A Inverting Input
Comparator A Noninverting Input
Comparator B Noninverting Input
Comparator B Inverting Input
Comparator B Output
3
3
INA+
INB+
INB-
5
5
6
6
7
7
OUTB
OUTC
INC-
—
—
—
—
—
—
8
Comparator C Output
9
Comparator C Inverting Input
Comparator C Noninverting Input
Comparator D Noninverting Input
Comparator D Inverting Input
Comparator D Output
10
12
13
14
INC+
IND+
IND-
OUTD
applied to SHDN places the device in the shutdown
Detailed Description
✕
mode. A minimum logic high voltage of 0.7V
V
DD
The MAX9030/MAX9031/MAX9032/MAX9034 are sin-
gle/dual/quad low-cost comparators. They have an
operating supply voltage from +2.5V to +5.5V when
operating from a single supply and from 1.25V to
2.75V when operating from dual power supplies, and
consume only 35µA. Their common-mode input voltage
range extends from the negative supply to within 1.1V
of the positive supply. Internal hysteresis ensures clean
output switching, even with slow-moving input signals.
applied to SHDN will enable normal operation. To dis-
able shutdown, connect SHDN to V
.
DD
Applications Information
Adding Hysteresis
Hysteresis extends the comparator’s noise margin by
increasing the upper threshold and decreasing the
lower threshold. A voltage-divider from the output of the
comparator sets the trip voltage. Therefore, the trip volt-
age is related to the output voltage.
Shutdown Mode
The MAX9030 comparator comes with a power-saving
shutdown mode. When in shutdown, the supply current
drops from a typical 35µA to 0.05µA, and the outputs
become high impedance. SHDN has a high input imped-
These comparators have 4mV internal hysteresis.
Additional hysteresis can be generated with two resis-
tors using positive feedback (Figure 1). Use the follow-
ing procedure to calculate resistor values:
ance and typically draws 0.1µA when connected to V
SS
✕
or V . A maximum logic low voltage of 0.3V
V
DD
DD
6
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