Owner's manual
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
12 ______________________________________________________________________________________
MAX973
MAX983
V+
7
+3.3V
LOGIC
SUPPLY
10k
20k
2.4M
LOW BATT
OUTB
8
REF
6
HYST
5
2
V-
R2
47k
R1
110k
STEP-DOWN
REGULATOR
3
INA+
1
OUTA
4
INB-
1M
BATTERY
(4 CELLS)
953k
Q1
+9V DC
WALL
ADAPTER
470k
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
914
10k
V+
GND
MAX974
MAX984
+5V +3.3V
10k
10k
10k
REF
V-
N.C.
-5V
V
INA
V
INB
V
INC
V
IND
Figure 6. Battery Switchover Circuit
Figure 7. Level Shifter: ±5V Input to Single-Ended +3.3V
Output
__________________________________________________________Pin Configurations
1
2
3
4
OUT
V+
REF
HYSTIN-
IN+
V-
GND
MAX971
MAX981
DIP/SO/µMAX
TOP VIEW
DIP/SO/µMAX
DIP/SO/µMAX
8
7
6
5
1
2
3
4
OUTB
V+
INB+
INB-INA-
INA+
V-
OUTA
MAX972
8
7
6
5
1
2
3
4
OUTB
V+
REF
HYSTINB+
INA+
V-
OUTA
MAX982
8
7
6
5