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.

For clock inputs, fmax is measured when the input duty cycle is 50%.

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

TEST

S1

RL

CL

ΔV

VLOAD

tPLZ, tPZL

CLOSED

500Ω

50pF

0.3V

2×VCC

CL

(1)

From Output

Under Test

VLOAD

Test

Point

S1

RL

RL

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

Figure 6-1. Load Circuit for Open-Drain Outputs

CL

(1)

From Output

Under Test

Test

Point

RL

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

Figure 6-2. Load Circuit for Push-Pull Outputs

Vt

tw

Input

Vt

VCC

0 V

Figure 6-3. Voltage Waveforms, Pulse Duration

Clock

Input

Vt

VCC

0 V

Vt

Vt

VCC

0 V

tsu

Data

Input

th

Figure 6-4. Voltage Waveforms, Setup and Hold

Times

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 6-5. Voltage Waveforms Propagation Delays

Input

50%

VOH

VOL

tPLZ

(1)

tPZL

(2)

VOH

VOL

tPZL

(2)

tPLZ

(1)

50%

Vt

Vt

VCC

0 V

10% VCC

Output

Waveform 1

Output

Waveform 2

10%

(1) tPLZ is the same as tdis.

(2) tPZL is the same as ten.

Figure 6-6. Voltage Waveforms Propagation Delays

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