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.

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

Table 6-1. 3-State Outputs

TEST

S1

S2

RL

CL

ΔV

VLOAD

tPLH, tPHL

OPEN

OPEN

500Ω

50pF

—

—

tPLZ, tPZL

CLOSED

OPEN

500Ω

50pF

0.3V

2×VCC

tPHZ, tPZH

OPEN

CLOSED

500Ω

50pF

0.3V

—

Table 6-2. 3-State or Open-Drain Outputs

VCC

Vt

RL

CL

ΔV

VLOAD

1.2V ± 0.1V

VCC/2

2kΩ

15pF

0.1V

2×VCC

1.5V ± 0.12V

VCC/2

2kΩ

15pF

0.1V

2×VCC

1.8V ± 0.15V

VCC/2

1kΩ

30pF

0.15V

2×VCC

2.5V ± 0.2V

VCC/2

500Ω

30pF

0.15V

2×VCC

2.7V

1.5V

500Ω

50pF

0.3V

6V

3.3V ± 0.3V

1.5V

500Ω

50pF

0.3V

6V

Table 6-3. Push-Pull Outputs

VCC

Vt

RL

CL

ΔV

1.2V ± 0.1V

VCC/2

2kΩ

15pF

0.1V

1.5V ± 0.12V

VCC/2

2kΩ

15pF

0.1V

1.8V ± 0.15V

VCC/2

1kΩ

30pF

0.15V

2.5V ± 0.2V

VCC/2

500Ω

30pF

0.15V

2.7V

1.5V

500Ω

50pF

0.3V

3.3V ± 0.3V

1.5V

500Ω

50pF

0.3V

CL

(1)

RL

From Output

Under Test

VLOAD

Test

Point

S1

S2

RL

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

Figure 6-1. Load Circuit for 3-State 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

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