AS1970 - AS1975
L o w - Vo l ta g e S i n g l e / D u a l / Q u a d C o m pa r a t o r s
D a ta S he e t
1 General Description
The AS1970 - AS1975 are single/dual/quad compara-
tors that operate with supplies from 2.5 to 5.5V making
them perfect for all 3- and 5-volt applications. The com-
parators can also operate with dual supplies (±1.25 to
±2.75V), and require very little supply current (down to
8.5µA) with minimal propagation delay (300ns).
Low input bias current (1.0pA, typ), low input offset volt-
age (0.5mV, typ), and internal hysteresis (3mV) make
these comparators ideal for low-power single-cell appli-
cations including power-management and power-moni-
toring systems.
The comparators are available as the standard products
listed in
Table 1. Standard Products
Model
AS1970/AS1972/AS1974
AS1971/AS1973/AS1975
Output Type
Push/Pull
Open-Drain
2 Key Features
!
CMOS Push/Pull Output Sinks and Sources 8mA
(AS1970/AS1972/AS1974)
CMOS Open-Drain Output Voltage Extends Beyond
V
CC
(AS1971/AS1973/AS1975)
Quiescent Supply Current: 8.5µA per Comparator
Internal Hysteresis: 3mV
3V/5V Logic-Level Translation
Single-Supply Operation: 2.5 to 5.5V
Common-Mode Input Voltage Range Extends
250mV Above the Rails
Low Propagation Delay: 300ns
Minimized Overall Power Consumption
Supply Current @1MHz Switching Frequency: 80µA
No Phase Reversal for Overdriven Inputs
Package Types:
- 5-pin SOT23 – AS1970/AS1971
- 8-pin MSOP – AS1972/AS1973
- 14-pin TSSOP – AS1974/AS1975
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!
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!
!
The AS1970/AS1972/AS1974 push/pull output can sink
or source current.
The AS1971/AS1973/AS1975 open-drain output can be
pulled beyond V
CC
to a maximum of 5.5V > V
EE
. These
open-drain versions are ideal for logic-level translators
or bipolar-to-unipolar converters.
Large internal output drivers allow Rail-to-Rail output
swings with loads of up to 8mA.
The AS1970/AS1971 are available in a 5-pin SOT23
package. The AS1972/AS1973 are available in a 8-pin
MSOP package. The AS1974/AS1975 are available in a
14-pin TSSOP package.
Figure 1. Block Diagrams
3 Applications
The devices are ideal for battery-powered systems,
mobile communication devices, zero-crossing detectors,
window comparators, level translators, threshold detec-
tors/discriminators, ground/supply-sensing applications,
IR receivers or any other space-limited application with
low power-consumption requirements.
+
–
+
–
+
–
+
–
OUTD
OUTC
OUTB
OUTA
INA+
INA+
IN+
IN-
+
–
OUT
INA-
+
–
OUTA
INA-
INB+
INB-
INB+
INB-
V
CC
+
–
OUTB
INC+
INC-
IND+
V
CC
V
EE
AS1970/AS1971
AS1972/AS1973
V
EE
IND-
V
CC
AS1974/AS1975
V
EE
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