Datasheet MAX987, MAX988, MAX991, MAX992, MAX995, MAX996 (Maxim) - 10

MAX987/MAX988/MAX991/ High-Speed, Micropower, Low-Voltage, MAX992/MAX995/MAX996 Rail-to-Rail I/O Comparators
Zero-Crossing Detector Logic-Level Translator
Figure 3 shows a zero-crossing detector application. The Figure 4 shows an application that converts 5V logic levels MAX987’s inverting input is connected to ground, and to 3V logic levels. The MAX988 is powered by the +5V its noninverting input is connected to a 100mVp-p signal supply voltage, and the pullup resistor for the MAX988’s source. As the signal at the noninverting input crosses 0V, open-drain output is connected to the +3V supply voltage. the comparator’s output changes state. This configuration allows the full 5V logic swing without creating overvoltage on the 3V logic inputs. For 3V to 5V logic-level translation, simply connect the +3V supply to VCC and the +5V supply to the pullup resistor. V +5V (+3V) CC 0.1µF 0.1µF +3V (+5V) 2 2 VCC 100mV 100kΩ VCC R 4 IN+ PULLUP 4 IN- OUT 1 OUT 1 3V (5V) LOGIC OUT 3 IN- 100kΩ 3 IN+
MAX987 MAX988
VEE VEE 5 5 5V (3V) LOGIC IN Figure 3. Zero-Crossing Detector Figure 4. Logic-Level Translator
Pin Configurations (continued)
TOP VIEW
+ + +
OUTA 1 14 OUTD N.C. 1 8 N.C. OUTA 1 8 VCC INA- 2 13 IND- IN- 2
MAX987
7 VCC INA- 2
MAX991
7 OUTB
MAX988 MAX992
INA+ 3 12 IND+ IN+ 3 6 OUT 3
MAX995
INA+ 6 INB- VCC 4
MAX996
11 VEE VEE 4 5 N.C. VEE 4 5 INB+ INB+ 5 10 INC+ INB- 6 9 INC-
SO SO/µMAX
OUTB 7 8 OUTC
SO/TSSOP
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