Pin configurations (continued), Zero-crossing detector, Logic-level translator – Rainbow Electronics MAX996 User Manual
Page 10
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996
High-Speed, Micropower, Low-Voltage,
SOT23, Rail-to-Rail I/O Comparators
10
______________________________________________________________________________________
Zero-Crossing Detector
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.
Logic-Level Translator
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 pull-up 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
CC
and the +5V supply to the pull-up resistor.
MAX987
IN+
4
3
OUT
1
2
5
V
CC
100mV
V
CC
V
EE
IN-
0.1
µF
MAX988
IN-
100k
100k
4
3
R
PULL-UP
3V (5V)
LOGIC OUT
OUT
1
5
2
V
CC
+5V (+3V)
+3V (+5V)
V
EE
5V (3V) LOGIC IN
IN+
0.1
µF
Figure 3. Zero-Crossing Detector
Figure 4. Logic-Level Translator
Pin Configurations (continued)
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUTD
IND-
IND+
V
EE
V
CC
INA+
INA-
OUTA
MAX995
MAX996
INC+
INC-
OUTC
OUTB
INB-
INB+
SO/TSSOP
OUT
N.C.
V
EE
1
2
8
7
N.C.
V
CC
IN-
IN+
N.C.
SO
TOP VIEW
3
4
6
5
MAX987
MAX988
INB-
INB+
V
EE
1
2
8
7
V
CC
OUTB
INA-
INA+
OUTA
SO/
µMAX/SOT23
3
4
6
5
MAX991
MAX992