Rainbow Electronics MAX984 - Manual (Page 12)

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
9 14
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
HYST IN-
IN+
V-
GND
MAX971
MAX981
DIP/SO/ µ MAX
TOP VIEW
DIP/SO/ µ MAX DIP/SO/ µ MAX
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
HYST INB+
INA+
V-
OUTA
MAX982
8
7
6
5