NCS2200 Series
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OPERATING DESCRIPTION
The NCS2200 Series is an industry first sub−one volt, low
power comparator family. This series is designed for
rail−to−rail input and output performance. These devices
consume only 10 A of supply current while achieving a
typical propagation delay of 1.1 s at a 20 mV input
overdrive. Figures 10 and 11 show propagation delay with
various input overdrives. This comparator family is
guaranteed to operate at a low voltage of 0.85 V up to 6.0 V.
This is accomplished by the use of a modified analog CMOS
process that implements depletion MOSFET devices. The
common−mode input voltage range extends 0.1 V beyond
the upper and lower rail without phase inversion or other
adverse effects. This series is available in the SOT23−5 and
SOT23−6 package. Additionally, the NCS2200 device is
available in the tiny QFN 2x2.2 package.
The SOT23−6 features the enable function, which can be
externally controlled. This feature allows significantly
lower current consumption of 0.3 A. This makes the
devices suitable for implementation in power sensitive
applications such as portable electronics. The enable
function is active high when connected to the V
CC
pin.
When the enable pin is driven low (device disabled), output
tri−state mode is activated. The device will remain in this
mode and will not respond to any changes at the inputs of the
comparator. In order to pull the device out of tri−state mode,
the enable upper voltage threshold must be met. Figure 15
shows the enable input voltage required to either enable or
disable the device, with a variance in supply voltage. In
addition, these devices have a typical internal hysteresis of
8.0 mV. This allows for greater noise immunity and clean
output switching.
Output Stage
The NCS2200/1 has a complementary P and N channel
output stage that has capability of driving a rail−to−rail
output swing with a load ranging up to 5.0 mA. It is designed
such that shoot−through current is minimized while
switching. This feature eliminates the need for bypass
capacitors under most circumstances.
The NCS2202/3 has an open drain N−channel output
stage that can be pulled up to 6.0 V (max) with an external
resistor. This facilitates mixed voltage system applications.
Figure 17. NCS2200/1SNxT1 Complementary
Output Configuration
Figure 18. NCS2202/3SNxT1 Open Drain
Output Configuration
V
CC
V
EE
Output
IN (+)
IN (−)
V
CC
V
EE
Output
IN (+)
IN (−)
