6 Parameter Measurement Information

Phase relationships between waveforms were chosen arbitrarily for the examples listed in the following table. All

input pulses are supplied by generators having the following characteristics: PRR ≤ 1MHz, ZO = 50Ω, tt < 2.5ns,

Vt = 1.5V. For push-pull outputs, RL = 500Ω.

The outputs are measured individually with one input transition per measurement.

CL

(1)

From Output

Under Test

Test

Point

RL

(1) CL includes probe and test-fixture capacitance.

Figure 6-1. Load Circuit for Push-Pull Outputs

Vt

Input

Vt

VCC

0 V

50%

50%

VOH

VOL

tPLH

(1)

tPHL

(1)

VOH

VOL

tPHL

(1)

tPLH

(1)

Output

Waveform 1

Output

Waveform 2

50%

50%

(1) The greater between tPLH and tPHL is the same as tpd.

Figure 6-2. Voltage Waveforms Propagation Delays

VOH

VOL

Output

VCC

0 V

Input

tf

(1)

tr

(1)

90%

10%

90%

10%

tr

(1)

90%

10%

tf

(1)

90%

10%

(1) The greater between tr and tf is the same as tt.

Figure 6-3. Voltage Waveforms, Input and Output Transition Times

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