TLC372, TLC372Q, TLC372Y
LinCMOS™ DUAL DIFFERENTIAL COMPARATORS
SLCS114B – NOVEMBER 1983 – REVISED MARCH 1999
PARAMETER MEASUREMENT INFORMATION
Response 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. Response time, low-to-high-level output, is measured from the leading
edge of the input pulse, while response time, high-to-low-level output, is measured from the trailing edge of the input
pulse. Response-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
Pulse
Generator
50
Ω
1V
Input Offset Voltage
Compensation Adjustment
–1 V
10
Ω
10 Turn
DUT
5.1 kΩ
1
µF
CL
(see Note A)
1 kΩ
0.1
µF
TEST CIRCUIT
Overdrive
100 mV
Overdrive
Input
Input
100 mV
90%
90%
High-to-Low-
Level Output
tr
VOLTAGE WAVEFORMS
50%
10%
tf
tPHL
tPLH
NOTE A: CL includes probe and jig capacitance.
Figure 3. Response, Rise, and Fall Times Circuit and Voltage Waveforms
8
ÁÁÁ
Low-to-High-
Level Output
50%
10%
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DALLAS, TEXAS 75265
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