TS12011/TS12012
BLOCK DIAGRAM
THEORY OF OPERATION
The TS12011 and TS12012 combine a 0.58V ±4.5%
reference, a 20µs analog comparator, and a unity-
gain stable operational amplifier in a single package.
All three devices operate from a single 0.8V to 2.5V
power supply and consume less than 1.6µA total
supply current. The TS12011 comparator has a push-
pull output stage while the TS12012 comparator has
an open-drain output stage that allows for easy
output voltage level translation as can occur when
driving systems powered with a different power
supply rail. Both the analog comparator and the op
amp feature a common mode input range from V
SS
to
V
DD
. The analog comparator exhibits ±7.5mV of
internal hysteresis for clean, chatter-free output
switching. The internal reference was designed to
sink or source up to 0.1µA load currents.
The TS12011 and the TS12012 have a latch enable
pin
T that allows the output of the comparator
to latch to either a HIGH or LOW state under certain
conditions. If
T is set HIGH, the COMPOUT
output will respond to the applied comparator input.
However, when
T is set LOW and the TS12011
output is HIGH, COMPOUT will remain HIGH until
T toggles LOW. When COMPOUT is initially
LOW instead, COMPOUT will latch HIGH and remain
HIGH on a LOW-to-HIGH transition at the input of the
comparator until
T goes HIGH. The TS12012
output is the inverted version of the TS12011 output.
The
T pin must not be left open and should be
connected to V
DD
for normal unlatched operation or to
V
SS
for latched operation.
Op Amp
The TS12011 and TS12012 have a unity-gain stable
op-amp with a GBWP of 15kHz, a slew rate of 6V/ms,
and can drive a capacitive load up to 50pF. The
common mode input voltage range extends from
V
SS
to V
DD
and the
input bias current and
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TS12011_12DS r1p0
RTFDS
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