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TS2903
3-6
2005/04 rev. A
Electrical Characteristics (Continues)
Note 1
.
The max. Output current may be as high as 20mA, independent of the magnitude of V
CC
, output short circuits to
V
CC
can cause excessive heating and eventual destruction.
Note 2. This magnitude of input current will only occur if the input leads are driven more negative than ground or the
negative supply voltage. This is due to the input PNP collector base junction becoming forward biased acting as
an input clamp diode. There is also a lateral PNP parasitic transistor action on the IC chip. This phenomena can
cause the output voltage of the comparators to go to the V
CC
voltage level (or ground if overdrive is large) during
the time the input is driven negative. This will not destroy the device and normal output states will recover when
the inputs become -0.3V of ground or negative supply.
Note 3. At output switch point, V
O
=1.4Vdc, R
S
=0
with V
CC
from 5Vdc to 30Vdc, and over the full input common-mode
Note 4. Due to the PNP transistor inputs, bias current will flow out of the inputs, this current is essentially constant
independent of the output state, therefore, no loading changes will exist on the input lines.
Note 5. Input common mode of either input should not be permitted to go more than 0.3V negative of ground or minus
supply. The upper limit of common mode range is V
CC
- 1.5V but either or both inputs can betaken to as high as
30volts without damage.
Note 6. Response time is specified with a 100mV step and 5.0mV of overdrive. With larger magnitudes of overdrive
faster response times are obtainable.
Note 7. The comparator will inhibit proper output state if one of the inputs is become greater than V
CC,
the other input
must remain within the common mode range. The low input state must not be less than -0.3volts of ground of
minus supply.