Micropower, Low-Voltage, UCSP/SC70,

Rail-to-Rail I/O Comparators

_______________________________________________________________________________________

9

Zero-Crossing Detector

Figure 3 shows a zero-crossing detector application.

The MAX985’s inverting input is connected to ground,

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 MAX986 is powered by the 5V

supply voltage, and the pullup resistor for the MAX986’s

open-drain output is connected to the 3V supply voltage.

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

UCSP Applications Information

For the latest application details on UCSP construction,

dimensions, tape carrier information, PCB techniques,

bump-pad layout, and recommended reflow tempera-

ture profile, as well as the latest information on reliability

testing results, refer to the Application Note: UCSP—A

Wafer-Level Chip-Scale Package on Maxim’s web site

at www.maxim-ic.com/ucsp.

MAX985

IN+

4

3

OUT

1

2

5

100mV

IN-

MAX986

IN-

100kΩ

100kΩ

4

3

3V (5V)

LOGIC OUT

OUT

1

5

2

5V (3V)

3V (5V)

5V (3V) LOGIC IN

IN+

Figure 3. Zero-Crossing Detector

Figure 4. Logic-Level Translator