Owner's manual

MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators
6 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(V+ = 5V, V- = GND, T
A
= +25°C, unless otherwise noted).
-2 2 10 18
RESPONSE TIME FOR VARIOUS
INPUT OVERDRIVES
0
4
MAX921/924-TOC13
RESPONSE TIME (µs)
OUTPUT VOLTAGE (V)
614
2
0
5
100
3
1
50mV
100mV
20mV
10mV
INPUT VOLTAGE (mV)
-2 2 10 18
RESPONSE TIME FOR VARIOUS
INPUT OVERDRIVES
0
4
MAX921/924-TOC14
RESPONSE TIME (µs)
OUTPUT VOLTAGE (V)
614
2
0
5
100
3
1
50mV
100mV
20mV
10mV
INPUT VOLTAGE (mV)
10
0.01
1.0 2.0 2.5
MAX924 RESPONSE TIME 
AT LOW SUPPLY VOLTAGES
0.1
1
MAX921/924-TOC15
SINGLE-SUPPLY VOLTAGE (V)
RESPONSE TIME (ms)
1.5
±20mV OVERDRIVE
±100mV 
OVERDRIVE
100
0.1
1.0 2.0 2.5
MAX924 RESPONSE TIME 
AT LOW SUPPLY VOLTAGES
1
10
MAX921/924-TOC16
SINGLE-SUPPLY VOLTAGE (V)
CURRENT (mA)
1.5
SINK CURRENT AT V
OUT
= 0.4V
SOURCE CURRENT INTO 0.75V LOAD
200
0
0 1.0 3.0 5.0
SHORT-CIRCUIT SOURCE CURRENT 
vs. SUPPLY VOLTAGE
40
160
MAX121/124-TOC17
TOTAL SUPPLY VOLTAGE (V)
SOURCE CURRENT (mA)
2.0 4.0
120
80
20
60
180
140
100
OUT CONNECTED TO V-
20
0
010
SHORT-CIRCUIT SINK CURRENT 
vs. SUPPLY VOLTAGE
MAX121/124-TOC18
TOTAL SUPPLY VOLTAGE (V)
SINK CURRENT (mA)
5


10
OUT CONNECTED TO V+
GND CONNECTED TO V-
PIN
MAX921 MAX922 MAX923
NAME FUNCTION
1 – – GND Ground. Connect to V- for single-supply operation. Output swings from V+ to GND.
– 1 OUTA Comparator A output. Sinks and sources current. Swings from V+ to V-.
2 2 2 V- Negative supply. Connect to ground for single-supply operation (MAX921).
1
3 – – IN+ Noninverting comparator input
– 3 3 INA+ Noninverting input of comparator A
4 – – IN- Inverting comparator input
____________________________________________________________Pin Descriptions
– 4 – INA- Inverting input of comparator A