Datasheet

MAX965–MAX970
Single/Dual/Quad, Micropower,
Ultra-Low-Voltage, Rail-to-Rail I/O Comparators
_______________________________________________________________________________________ 7
________________________________________________Pin Descriptions (continued)
_______________Detailed Description
The MAX965–MAX970 single/dual/quad, micropower,
ultra-low-voltage comparators feature rail-to-rail inputs
and outputs and an internal 1.235V ±1.5% bandgap
reference. These devices operate from a single +1.6V
to +5.5V supply voltage range, and consume less than
5µA supply current per comparator over the extended
temperature range. Internal hysteresis is programmable
up to ±50mV using two external resistors and the
device’s internal reference. The rail-to-rail input com-
mon-mode voltage range and the open-drain outputs
allow easy voltage-level conversion for multivoltage
systems. All inputs and outputs can tolerate a continu-
ous short-circuit fault condition to either rail.
The MAX965 is a single comparator with adjustable
hysteresis and a reference output pin. The MAX966 is a
dual comparator without the reference and without
adjustable hysteresis. The MAX967 is a dual compara-
tor configured as a dual voltage monitor with common
hysteresis adjustment and a reference output. The dual
MAX968 is similar to the MAX967, but is configured as
a window comparator. The MAX969 is a quad com-
parator with a common hysteresis adjustment and a ref-
erence output pin. The MAX970 is a quad comparator
without a reference and without hysteresis adjustment.
(See Functional Diagrams and Selector Guide.)
Comparator Input
The MAX965–MAX970 have a -0.25V to V
CC
input com-
mon-mode range. Both comparator inputs may operate
at any differential voltage within the common-mode
voltage range, and the comparator displays the correct
output logic state.
Low-Voltage Operation: V
CC
Down to 1V
The minimum operating voltage is 1.6V. As the supply
voltage falls below 1.6V, performance degrades
and supply current falls. The reference does not
MAX969/MAX970
FUNCTION
MAX969
SO
4 4 Comparator A Inverting Input
3 3 Positive Supply Voltage, +1.6V to +5.5V
2 2 Comparator A Open-Drain Output
1 1 Comparator B Open-Drain Output
8 — Internal Reference Output. Typically 1.235V with respect to GND.
— — No Connection. Not internally connected.
7 7 Comparator B Noninverting Input
6 6 Comparator B Inverting Input
5 5 Comparator A Noninverting Input
MAX970
QSOP
4
3
2
1
—
8, 9
7
6
5
NAME
INA-
VCC
OUTA
OUTB
REF
N.C.
INB+
INB-
INA+
PIN
9 — — HYST
Hysteresis Input. Connect to REF if not used. Input voltage range is
from (V
REF
- 50mV) to V
REF
.
10 8 10 INC- Comparator C Inverting Input
11 9 11 INC+ Comparator C Noninverting Input
12 10 12 IND- Comparator D Inverting Input
13 11 13 IND+ Comparator D Noninverting Input
14 12 14 GND Ground
15 13 15 OUTD Comparator D Open-Drain Output
16 14 16 OUTC Comparator C Open-Drain Output