TLC339IPW Datasheet, PDF (9/30 Pages) Texas Instruments – LinCOMS MICROPOWER QUAD COMPARATORS

TLC139, TLC339, TLC339Q
LinCMOS MICROPOWER QUAD COMPARATORS
PARAMETER MEASUREMENT INFORMATION
Propagation delay time is defined as the interval between the application of an input step function and the instant when
the output reaches 50% of its maximum value. Propagation delay time, low-to-high-level output, is measured from
the leading edge of the input pulse, while propagation delay time, high-to-low-level output, is measured from the
trailing edge of the input pulse. Propagation delay time measurement at low input signal levels can be greatly affected
by the input offset voltage. The offset voltage should be balanced by the adjustment at the inverting input as shown
in Figure 3, so that the circuit is just at the transition point. Then a low signal, for example 105-mV or 5-mV overdrive,
causes the output to change state.
VDD
1V
Input Offset Voltage
Compensation Adjustment
−1 V
Pulse
Generator
50 Ω
10 Ω
10 Turn
1 kΩ
DUT
0.1 µF
5.1 kΩ
1 µF
CL
(see Note A)
Overdrive
Input
TEST CIRCUIT
100 mV
Overdrive
Input ^{100 mV}
Low-to-High-Level
Output
50%
High-to-Low-Level
Output
90%
50%
10%
tPLH
VOLTAGE WAVEFORMS
NOTE A: CL includes probe and jig capacitance.
tTHL
tPHL
Figure 3. Propagation Delay, Rise, and Fall Times Test Circuit and Voltage Waveforms
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