843751 Data Sheet

FEMTOCLOCK™ SAS/SATA CLOCK GENERATOR

843751 REVISION B 08.21.15

11

©2015 Integrated Device Technology, Inc.

Termination for 2.5V LVPECL Outputs

Figure 4A and Figure 5B show examples of termination for 2.5V

LVPECL driver. These terminations are equivalent to terminating 50



to VCC – 2V. For VCC= 2.5V, the VCC– 2V is very close to ground

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

VCC = 2.5V

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

VCC = 2.5V

2.5V

50

Ω

50

Ω

R1

50

Ω

R2

50

Ω

+

–

2.5V LVPECL Driver

VCC = 2.5V

2.5V

50

Ω

50

Ω

R1

50

Ω

R2

50

Ω

R3

18

Ω

+

–