sy100ep14u Micrel Semiconductor, sy100ep14u Datasheet - Page 9

• Manufacturer Part Number: sy100ep14u
• Description: Sy100ep14u 2.5v/3.3v/5v 1 5 Lvpecl/pecl/ecl/hstl 2ghz Clock Driver With 2 1 Differential Input Mux
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
Note 1.
Note 2.
Note 1.
Note 2.
Note 3.
Note 1.
Note 2.
Note 3.
Note 4.
M9999-111805
[e-mail] or [phone]
TERMINATION RECOMMENDATIONS
For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω
For +5.0V systems: R1 = 82Ω, R2 = 130Ω
Power-saving alternative to Thevenin termination.
Place termination resistors as close to destination inputs as possible.
R
Unused output (/Q) must be terminated to balance the output.
Micrel's differential I/O logic devices include a V
Connect unused input through 50Ω to V
For +2.5V systems: R1 = 250Ω, R2 = 62.5Ω.
b
resistor sets the DC bias voltage, equal to V
Figure 1. Parallel Termination–Thevenin Equivalent
+3.3V
+3.3V
“source”
Figure 2. Three-Resistor “Y–Termination”
/Q
Q
+3.3V
BB
+3.3V
. Bypass with a 0.01µF capacitor to V
Figure 3. Terminating Unused I/O
R1
130Ω
R2
82Ω
V
t
Z
Z
. For +3.3V systems R
BB
t
= V
O
O
reference pin .
= 50Ω
= 50Ω
Z
CC
Z = 50Ω
Z = 50Ω
O
= 50Ω
–2V
R1
130Ω
R2
82Ω
50Ω
9
50Ω
+3.3V
+3.3V
b
= 46Ω to 50Ω. For +5V systems, R
R1
130Ω
R2
82Ω
R
50Ω
b
R1
130Ω
R2
82Ω
+3.3V
CC
“destination”
, not GND.
50Ω
0.01µF
+3.3V
V
+3.3V
t
+3.3V
= V
CC
V
BB
–2V
b
= 110Ω.
Precision Edge
SY100EP14U
®