Ultra-Low-Power, Open-Drain,

Single/Dual-Supply Comparators

______________________________________________________________________________________

13

MAX973

MAX983

V+

7

3.3V

LOGIC

SUPPLY

10k

Ω

20k

Ω

2.4M

Ω

LOW BATT

OUTB 8

REF 6

HYST 5

2

V-

R2

47k

Ω

R1

110k

Ω

STEP-DOWN

REGULATOR

3 INA+

1 OUTA

4 INB-

1M

Ω

BATTERY

(4 CELLS)

953k

Ω

Q1

9V DC

WALL

ADAPTER

470k

Ω

DC OK

INB+

INB-

INC+

INC-

IND+

IND-

INA+

INA-

4

5

3

7

6

11

10

13

12

OUTA 2

1

16

15

8

OUTB

OUTC

OUTD

9

14

10k

Ω

V+

GND

MAX974

MAX984

5V

3.3V

10k

Ω

10k

Ω

10k

Ω

REF

V-

N.C.

-5V

Figure 6. Battery Switchover Circuit

Figure 7. Level Shifter: ±5V Input to Single-Ended 3.3V Output

UCSP Applications Information

For the latest application details on UCSP contruction,

dimensions, tape carrier information, printed circuit

board

techniques,

bump-pad

layout

and

recommended reflow temperature profile as well as the

latest information on reliability testing results, go to

Maxim’s web site at www.maxim-ic.com/ucsp to find

the Application Note: UCSP–A Wafer-Level Chip-Scale

Package.