5

LTC1520

SWITCHI G TI E WAVEFOR S

Figure 1. Propagation Delay Test Circuit and Waveforms

2.5V

2.5V

3V

2V

INPUT

OUTPUT

1520 F01

–

+

INPUT

2.5V

OUTPUT

15pF

1520 F01b

1/4 LTC1520

Figure 2. Receiver Enable and Disable Timing

Test Circuit and Waveforms

1.5V

1.5V

1.5V

1k

1k

S1

S2

1.5V

0.2V

0.2V

OUTPUT

NORMALLY LOW

OUTPUT

NORMALLY HIGH

0V

3V

ENABLE

5V

0V

RECEIVER

OUTPUT

OUT 1

OUT 1

1520 F02

3V

B1, B2 = 2.5V

2V

CH1 OUT

INPUT

A1, A2

CH2 OUT

1520 F03

Figure 3. Any Channel to Any Channel Skew, Same Package

Figure 4. Package-to-Package Propagation Delay Skew

SAME INPUT FOR BOTH PACKAGES

INPUT

A1, B1

PACKAGE 1

OUT 1

1520 F04

PACKAGE 2

OUT 1

EQUIVALE T I PUT NETWORKS

3.3V

≥18k

≥18k

A

B

3.3V

≥18k

A

B

1520 F05

≥18k

Figure 5. Input Thevenin Equivalent