ICS889831 Datasheet, PDF (12/18 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-4 DIFFERENTIAL LVPECL-TO-LVPECL/ECL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
ICS889831
LOW SKEW, 1-TO-4
DIFFERENTIAL LVPECL-TO-LVPECL/ECL FANOUT BUFFER
3.3V DIFFERENTIAL INPUT WITH BUILT-IN 50Ω TERMINATION UNUSED INPUT HANDLING
To prevent oscillation and to reduce noise, it is recommended to
have pullup and pulldown connect to true and compliment of the
unused input as shown in Figure 6.
3.3V
3.3V
R1
1K
IN
VT
nIN
R2
1K
Receiver
with
Built-In
50 Ohm
FIGURE 6. UNUSED INPUT HANDLING
2.5V DIFFERENTIAL INPUT WITH BUILT-IN 50Ω TERMINATION UNUSED INPUT HANDLING
To prevent oscillation and to reduce noise, it is recommended to
have pullup and pulldown connect to true and compliment of the
unused input as shown in Figure 7.
2.5V
2. 5V
R1
680
IN
VT
nI N
R2
680
Receiver
with
Built-In
50 Ohm
FIGURE 7. UNUSED INPUT HANDLING
889831AK
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12
REV. A JUNE 16, 2005