MAX921CUA+ Maxim Integrated Products, MAX921CUA+ Datasheet - Page 8

• Manufacturer Part Number: MAX921CUA+
• Description: IC COMPARATOR W/REF 8-UMAX
• Manufacturer: Maxim Integrated Products
• Type: with Voltage Referencer

Specifications of MAX921CUA+

• Number Of Elements: 1
• Output Type: CMOS, TTL
• Voltage - Supply: 2.5 V ~ 11 V, ±1.25 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Number Of Channels: 1 Channel
• Product: Analog Comparators
• Offset Voltage (max): +/- 10 mV
• Supply Voltage (max): 11 V
• Supply Voltage (min): 2.5 V
• Supply Current (max): 3.2 uA
• Maximum Power Dissipation: 330 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Comparator Type: General Purpose
• No. Of Comparators: 1
• Response Time: 12µs
• Ic Output Type: CMOS, TTL
• Supply Current: 2.5µA
• Supply Voltage Range: ± 1.25V To ± 5.5V
• Amplifier Case Style: µMAX
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Ultra Low-Power,
Single/Dual-Supply Comparators
The MAX921–MAX924 comprise various combinations
of a micropower 1.182V reference and a micropower
comparator. The Typical Operating Circuit shows the
MAX921 configuration, and Figures 1a-1c show the
MAX922–MAX924 configurations.
Each comparator continuously sources up to 40mA,
and the unique output stage eliminates crowbar
glitches during output transitions. This makes them
immune to parasitic feedback (which can cause
instability) and provides excellent performance, even
when circuit-board layout is not optimal.
Internal hysteresis in the MAX921 and MAX923 provides
the easiest method for implementing hysteresis. It also
produces faster hysteresis action and consumes much
less current than circuits using external positive feedback.
This family of devices operates from a single +2.5V to
+11V power supply. The MAX921 and MAX924 have a
Figure 1a. MAX922 Functional Diagram
Figure 1b. MAX923 Functional Diagram
8
_______________Detailed Description
_______________________________________________________________________________________
Power-Supply and Input Signal Ranges
1
2
3
4
1
2
3
4
INA+
INA+
OUTA
INA-
OUTA
INB-
V-
V-
V-
MAX922
MAX923
OUTB
OUTB
HYST
INB+
INB-
REF
V+
V+
8
7
6
8
7
6
5
5
separate ground for the output driver, allowing
operation with dual supplies ranging from ±1.25V to
±5.5V. Connect V- to GND when operating the
MAX921 and the MAX924 from a single supply. The
maximum supply voltage in this case is still 11V.
For proper comparator operation, the input signal can
swing from the negative supply (V-) to within one volt of
the positive supply (V+ – 1V). The guaranteed
common-mode input voltage range extends from V- to
(V+ - 1.3V). The inputs can be taken above and below
the supply rails by up to 300mV without damage.
Operating the MAX921 and MAX924 at ±5V provides
TTL/CMOS compatibility when monitoring bipolar input
signals. TTL compatibility for the MAX922 and MAX923
is achieved by operation from a single +5V supply.
The guaranteed minimum operating voltage is 2.5V (or
±1.25V). As the total supply voltage is reduced below
2.5V, the performance degrades and the supply
current falls. The reference will not function below
Figure 1c. MAX924 Functional Diagram
Low-Voltage Operation: V+ = 1V (MAX924 Only)
1
5
2
3
4
6
7
8
INA-
INB-
REF
OUTB
OUTA
INA+
INB+
V+
MAX924
OUTC
OUTD
IND+
INC+
GND
IND-
INC-
V-
15
14
13
12
16
11
10
9