TLC193, TLC393

DUAL MICROPOWER LinCMOS

™ VOLTAGE COMPARATOR

SLCS115D – DECEMBER 1986 – REVISED JANUARY 1999

9

POST OFFICE BOX 655303

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.

DUT

VDD

CL

(see Note A)

Pulse

Generator

10

Ω

10 Turn

1 V

– 1 V

1 k

Ω

50

Ω

1

µF

0.1

µF

TEST CIRCUIT

100 mV

Input

Overdrive

50%

tPLH

100 mV

Input

Overdrive

90%

50%

10%

tf

tPHL

Low-to-High-

Level Output

High-to-Low-

Level Output

VOLTAGE WAVEFORMS

5.1 k

Ω

Input Offset Voltage

Compensation

Adjustment

90%

tr

10%

NOTE A: CL includes probe and jig capacitance.

Figure 3. Propagation Delay, Rise Time, and Fall Time Circuit and Voltage Waveforms