ICS853111AY datasheet(11/19 Pages) IDT

11 / 19 page

IDT™ / ICS™ 1-TO-10, LVPECL/ECL FANOUT BUFFER

ICS853111AY REV. C OCTOBER 25, 2007

ICS853111A

LOW SKEW, 1-TO-10, DIFFERENTIAL-TO-LVPECL/ECL FANOUT BUFFER

TERMINATION FOR 2.5V LVPECL OUTPUT

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

LVPECL driver. These terminations are equivalent to terminating

Ω to V

- 2V. For V

= 2.5V, the V

- 2V is very close to ground

level. The R3 in Figure 5B can be eliminated and the

termination is shown in Figure 5C.

Zo = 50 Ohm

VCCO=2.5V

Zo = 50 Ohm

2.5V

2,5V LVPECL

Driv er

FIGURE 5B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

VCCO=2.5V

Zo = 50 Ohm

2,5V LVPECL

Driv er

Zo = 50 Ohm

2.5V

FIGURE 5A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

62.5

2.5V

2,5V LVPECL

Driv er

250

Zo = 50 Ohm

62.5

2.5V

250

VCCO=2.5V

FIGURE 5C. 2.5V LVPECL TERMINATION EXAMPLE

TERMINATION FOR 5V LVPECL OUTPUT

This section shows examples of 5V LVPECL output termination.

Figure 6A shows standard termination for 5V LVPECL. The

termination requires matched load of 50

Ω resistors pull down to

Zo = 50 Ohm

PECL

Zo = 50 Ohm

125

PECL

Zo = 50 Ohm

125

FIGURE 6A. STANDARD 5V LVPECL OUTPUT TERMINATION

FIGURE 6B. 5V LVPECL OUTPUT TERMINATION EXAMPLE

- 2V = 3V at the receiver. Figure 6B shows Thevenin

equivalence of Figure 6A. In actual application where the 3V DC

power supply is not available, this approached is normally used.

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