TLC393-Q1_14 Datasheet, PDF (5/21 Pages) Texas Instruments – DUAL MICROPOWER LinCMOS™ VOLTAGE COMPARATOR

TLC393-Q1
www.ti.com
SGLS198B – SEPTEMBER 2004 – REVISED MAY 2013
PARAMETER MEASUREMENT INFORMATION (continued)
U1B
1/4 TLC274CN
+
Buffer
C2
1 µF
C1
0.1 µF
−
R4
47 kΩ
R1
240 kΩ
U1A
− ^{1/4 TLC274CN}
+
Triangle
Generator
R3
100 Ω
R2
10 kΩ
V_DD
R5
1.8 kΩ, 1%
C3
0.68 µF
−
DUT
+
R6
5.1 kΩ
R7
1 MΩ
R8
1.8 kΩ, 1%
U1C
1/4 TLC274CN
−
+ _Integrator
C4
0.1 µF
V_IO
(X100)
R10
100 Ω, 1%
R9
10 kΩ, 1%
Figure 2. Circuit for Input Offset Voltage Measurement
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.
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