MAX990ESA Maxim, MAX990ESA Datasheet - Page 9

• Manufacturer Part Number: MAX990ESA
• Description: Micropower / Low-Voltage / SOT23 / Rail-to-Rail I/O Comparators
• Manufacturer: Maxim

Figure 3 shows a zero-crossing detector application.
The MAX985’s inverting input is connected to ground,
and its noninverting input is connected to a 100mVp-p
signal source. As the signal at the noninverting input
crosses 0V, the comparator’s output changes state.
Figure 3. Zero-Crossing Detector
_____________________________________________Pin Configurations (continued)
TOP VIEW
100mV
N.C.
V
IN+
IN-
EE
1
2
4
3
4
3
MAX985
MAX986
_______________________________________________________________________________________
IN+
IN-
SO
Zero-Crossing Detector
6
8
7
5
V
V
V
CC
CC
EE
2
5
N.C.
V
OUT
N.C.
CC
MAX985
Micropower, Low-Voltage, SOT23,
OUT 1
OUTA
INA+
INA-
V
EE
1
2
4
3
Rail-to-Rail I/O Comparators
SO/ MAX
MAX989
MAX990
Figure 4 shows an application that converts 5V logic lev-
els to 3V logic levels. The MAX986 is powered by the +5V
supply voltage, and the pull-up resistor for the MAX986’s
open-drain output is connected to the +3V supply volt-
age. This configuration allows the full 5V logic swing with-
out creating overvoltage on the 3V logic inputs. For 3V to
5V logic-level translation, simply connect the +3V supply
to V
Figure 4. Logic-Level Translator
CC
6
8
7
5
5V (3V) LOGIC IN
100k
100k
V
OUTB
INB-
INB+
and the +5V supply to the pull-up resistor.
CC
4
3
IN-
IN+
OUTA
OUTB
INA+
INB+
INA-
INB-
V
+5V (+3V)
CC
V
V
CC
EE
5
2
1
2
3
4
5
6
7
Logic-Level Translator
MAX986
MAX993
MAX994
OUT
SO
+3V (+5V)
1
14
13
12
11
10
9
8
R
PULL-UP
3V (5V)
LOGIC OUT
OUTD
IND-
IND+
V
INC+
INC-
OUTC
EE
9