AS1976, AS1977
U l t r a - L o w C u r r e n t , 1 . 8 V C o m pa r a t o r s
D a ta S he e t
1 General Description
The AS1976/AS1977 are very low-current comparators
that can operate beyond the rail voltages and are guar-
anteed to operate down to 1.8V
Low input bias current, current-limiting output circuitry,
and ultra-small packaging make these comparators
ideal for low-power 2-cell applications including power-
management and power-monitoring systems.
The comparators are available as the standard products
listed in
Table 1.
Table 1. Standard Products
2 Key Features
!
CMOS Push/Pull Output Sinks and Sources 8mA
(AS1976)
CMOS Open-Drain Output Voltage Extends Beyond
V
CC
(AS1977)
Ultra-Low Supply Current: 200nA
Internal Hysteresis: 3mV
3V-to5V Logiv-Level Translation
Guaranteed to Operate Down to +1.8V
Input Voltage Range Operates 200mV Beyond the
Rails
Crowbar Current-Free Switching
No Phase Reversal for Overdriven Inputs
5-pin SOT23 Package
!
!
!
!
Model
AS1976
AS1977
Output Type
Push/Pull
Open-Drain
Current
200nA
200nA
!
!
The AS1976 push/pull output can sink or source current.
The AS1977 open-drain output can be pulled beyond
V
CC
to a maximum of 6V > V
EE
. This open-drain model
is ideal for use as a logic-level translator or bipolar-to-
unipolar converter.
Large internal output drivers provide rail-to-rail output
swings with loads up to 8mA. Both devices feature built-
in battery power-management and power-monitoring cir-
cuitry.
The AS1976/AS1977 are available in a 5-pin SOT23
package.
!
!
!
3 Applications
The devices are ideal for battery monitoring/manage-
ment, mobile communication devices, laptops and
PDAs, ultra-low-power systems, threshold detectors/dis-
criminators, telemetry and remote systems, medical
instruments, or any other space-limited application with
low power-consumption requirements.
Figure 1. Block Diagram
5
V
CC
AS1976/
AS1977
+
–
1
OUT
3
IN+
4
IN-
2
V
EE
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