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.

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

—

VCC

Vt

RL

CL

ΔV

VLOAD

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

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

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

Vt

Output

Control

Vt

VCC

0 V

50%

50%

VCC

VOL

tPZL

(3)

tPLZ

(4)

VOH - V

VOH

0 V

tPZH

(3)

tPHZ

(4)

Output

Waveform 1

S1 CLOSED

S2 OPEN

Output

Waveform 2

S1 OPEN

S2 CLOSED

VOL + V

(1) The greater between tPZL and tPZH is the same as ten.

(2) The greater between tPLZ and tPHZ is the same as tdis.

Figure 6-3. 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 6-4. Voltage Waveforms, Input and Output

Transition Times

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SN74LVC126A

SCAS339T – MARCH 1994 – REVISED MAY 2024

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