MAX991 Maxim, MAX991 Datasheet - Page 10

• Manufacturer Part Number: MAX991
• Description: The MAX987/MAX988/MAX991/MAX992/MAX995/ MAX996 single/dual/quad micropower comparators feature low-voltage operation and rail-to-rail inputs and outputs
• Manufacturer: Maxim

Figure 3 shows a zero-crossing detector application.
The MAX987’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.
High-Speed, Micropower, Low-Voltage,
SOT23, Rail-to-Rail I/O Comparators
Figure 3. Zero-Crossing Detector
10
TOP VIEW
______________________________________________________________________________________
100mV
N.C.
IN+
V
IN-
EE
1
2
4
3
4
3
IN+
IN-
MAX987
MAX988
SO
Zero-Crossing Detector
V
V
V
CC
CC
EE
6
8
7
5
2
5
MAX987
N.C.
V
OUT
N.C.
CC
OUT 1
0.1µF
OUTA
INA+
INA-
V
EE
1
2
4
3
SO/µMAX/SOT23
MAX991
MAX992
Figure 4 shows an application that converts 5V logic lev-
els to 3V logic levels. The MAX988 is powered by the +5V
supply voltage, and the pullup resistor for the MAX988’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
5V (3V) LOGIC IN
8
7
6
5
100kΩ
100kΩ
and the +5V supply to the pullup resistor.
Pin Configurations (continued)
V
INB-
OUTB
INB+
CC
4
3
IN-
IN+
OUTA
OUTB
+5V (+3V)
INA+
INB+
INA-
INB-
V
CC
V
V
CC
EE
Logic-Level Translator
5
2
1
4
5
6
7
MAX988
2
3
SO/TSSOP
MAX995
MAX996
0.1µF
OUT
+3V (+5V)
1
R
14
13
12
11
10
8
9
PULLUP
3V (5V)
LOGIC OUT
OUTD
IND-
IND+
V
INC+
INC-
OUTC
EE