ICS858012 Datasheet, PDF (6/15 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-2, DIFFERENTIAL-TO-2.5V, 3.3V LVPECL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS858012
LOW SKEW, 1-TO-2, DIFFERENTIAL-TO-
2.5V, 3.3V LVPECL FANOUT BUFFER
APPLICATION INFORMATION
LVPECL INPUT WITH BUILT-IN 50Ω TERMINATION INTERFACE (2.5V)
The IN/nIN with built-in 50Ω terminations accepts LVDS, by the most common driver types. The input interfaces sug-
LVPECL, LVHSTL, CML, SSTL and other differential signals.
Both VSWING and VOH must meet the V_PP and V_CMR input require-
ments. Figures 1A to 1E show interface examples for the
HiPerClockS IN/nIN input with built-in 50Ω terminations driven
gested here are examples only. If the driver is from another ven-
dor, use their termination recommendation. Please consult with
the vendor of the driver component to confirm the driver termi-
nation requirements.
3.3V or 2.5V
2. 5V
2.5V
2. 5V
LVDS
Zo = 50 Ohm
Zo = 50 Ohm
IN
VT
nIN
R e c e ive r
With
Built-In
50 Ohm
Zo = 50 Ohm
Zo = 50 Ohm
2.5V LVPECL
IN
VT
nI N
R1
18
R e ce i ve r
With
Built-In
50 Ohm
FIGURE 1A. HIPERCLOCKS IN/nIN INPUT WITH
BUILT-IN 50Ω DRIVEN BY AN LVDS DRIVER
FIGURE 1B. HIPERCLOCKS IN/nIN INPUT WITH
BUILT-IN 50Ω DRIVEN BY AN LVPECL DRIVER
2.5V
2.5V
2.5V
2.5V
Zo = 50 Ohm
Zo = 50 Ohm
CML - Open Collector
IN
VT
nIN
R e ce i ve r
With
Built-In
50 Ohm
Zo = 50 Ohm
Zo = 50 Ohm
CML - Built-in 50 Ohm Pull-up
IN
VT
nIN
R e ce i ve r
With
Built-In
50 Ohm
FIGURE 1C. HIPERCLOCKS IN/nIN INPUT WITH
BUILT-IN 50Ω DRIVEN BY AN OPEN COLLECTOR
CML DRIVER
FIGURE 1D. HIPERCLOCKS IN/nIN INPUT WITH
BUILT-IN 50Ω DRIVEN BY A CML DRIVER
WITH BUILT-IN 50Ω PULLUP
2.5V
R1
R2
SSTL
25
Zo = 50 Ohm
Zo = 50 Ohm
25
2.5V
IN
VT
nIN
Receiver With Built-In 50Ω
FIGURE 1E. HIPERCLOCKS IN/nIN INPUT WITH
BUILT-IN 50Ω DRIVEN BY AN SSTL DRIVER
858012AK
www.icst.com/products/hiperclocks.html
6
REV. A NOVEMBER 28, 2005