ICS853S013AMI REVISION A AUGUST 20, 2010

11

©2010 Integrated Device Technology, Inc.

ICS853S013I Data Sheet

LOW SKEW, DUAL, 1-TO-3, DIFFERENTIAL-TO-2.5V, 3.3V LVPECL/ECL FANOUT BUFFER

Termination for 2.5V LVPECL Outputs

Figure 4A and Figure 4B show examples of termination for 2.5V

LVPECL driver. These terminations are equivalent to terminating 50

Ω

level. The R3 in Figure 4B can be eliminated and the termination is

shown in Figure 4C.

Figure 4A. 2.5V LVPECL Driver Termination Example

Figure 4C. 2.5V LVPECL Driver Termination Example

Figure 4B. 2.5V LVPECL Driver Termination Example

2.5V LVPECL Driver

2.5V

2.5V

50

Ω

50

Ω

R1

250

Ω

R3

250

Ω

R2

62.5

Ω

R4

62.5

Ω

+

–

2.5V LVPECL Driver

2.5V

50

Ω

50

Ω

R1

50

Ω

R2

50

Ω

+

–

2.5V LVPECL Driver

2.5V

50

Ω

50

Ω

R1

50

Ω

R2

50

Ω

R3

18

Ω

+

–