HDMP-3268 Datasheet, PDF (7/18 Pages) Agilent(Hewlett-Packard) – 3.2 Gbit/sec 68x68 Crosspoint Switch

DIGITAL OUTPUT
V_DD
DIGITAL INPUT
V_DD
GND
I/O
25 Ω
NOMINAL
OUTPUT
IMPEDANCE
IN
VREFI
Figure 6. Digital I/O simplified circuit schematics.
TERM
50 Ω
x1
GND
CONTROLLER
VREF0
0.1 µF
HDMP-3268
VREF1
VREF1
0.1 µF
VREF0
DATA I/O
50 Ω DRIVING
IMPEDANCE
25 Ω
50 Ω TRANSMISSION LINE
DATA I/O
25 Ω DRIVING
IMPEDANCE
TERM
A) UNTERMINATED SSTL_2 CONNECTION
CONTROLLER
0.1 µF
HDMP-3268
VREF1
VREF14
DATA I/O
50 Ω DRIVING
IMPEDANCE
25 Ω
50 Ω TRANSMISSION LINE
DATA I/O
25 Ω DRIVING
IMPEDANCE
TERM
B) UNTERMINATED LVTTL CONNECTION
Figure 7. Unterminated digital I/O connections.
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