AS1976-T austriamicrosystems, AS1976-T Datasheet - Page 10

• Manufacturer Part Number: AS1976-T
• Description: IC COMPARATOR PUSH/PULL SOT23-5
• Manufacturer: austriamicrosystems

Specifications of AS1976-T

• Comparator Type: General Purpose
• No. Of Comparators: 1
• Response Time: 15µs
• Ic Output Type: Push Pull
• Supply Current: 200nA
• Supply Voltage Range: 1.8V To 5.5V
• Amplifier Case Style: SOT-23
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS1976/AS1977
Data Sheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1976/AS1977 are ultra low-current comparators and are guaranteed to operate with voltages as low as +1.8V.
The common-mode input voltage range extends 200mV beyond the rail voltages, and internal hysteresis ensures
clean output switching, even with slow input signals.
The AS1976 push/pull output stage sinks and sources-current. The AS1977 open-drain output stage can be pulled
beyond V
to an absolute maximum of 3.6V > V
. The AS1979/AS1977 are perfect for implementing wired-OR out-
CC
EE
put logic functions.
For all comparators, large internal output drivers allow rail-to-rail output swings with loads of up to 8mA. The output
stage design minimizes supply-current surges during switching, eliminating most power supply transients.
Input Stage
The input common-mode voltage range extends from (V
- 0.2V) to (V
+ 0.2V), and the comparators can operate at
EE
CC
any differential input voltage within this range. The comparators have very low input bias current (±0.15nA, typ) if the
input voltage is within the common-mode voltage range.
Inputs are protected from over-voltage conditions by internal ESD protection diodes connected to the supply rails. As
the input voltage exceeds the supply rails, these ESD protection diodes are forward biased and begin to conduct.
Output Stage
The break-before-make output stage is capable of rail-to-rail operation with loads up to 8mA. Many comparators con-
sume orders of magnitude more current during switching than during steady-state operation.
Even at loads of up to 8mA, changes in supply-current during an output transition are extremely small (see
Figure 5 on
page
6). As shown in
Figure
5, the minimal supply current increases as the output switching frequency approaches
1kHz. This characteristic reduces the need for power-supply filter capacitors to reduce transients created by compara-
tor switching currents.
Because of the unique design of its output stage, the AS1976/AS1977 can dramatically increase battery life, even in
high-speed applications.
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