3.5.3 LVCMOS Output Terminations
LVCMOS outputs can be dc-coupled, as shown in the figure below.
1.71 to 3.465 V
OUTxb
OUTx
Zo=50Ω
Zo=50Ω
Set output driver
to 50Ω mode.
Figure 3.13. LVCMOS Output Termination Example, Option 1
1.425 to 3.465 V
OUTxb
Rs
OUTx
Rs
Rs = Zo – Rdrv
(see Table 5.8)
Set output driver
to 25Ω mode.
Figure 3.14. LVCMOS Output Termination Example, Option 2
3.5.4 LVCMOS Output Signal Swing
The signal swing (V
OL
/V
OH
) of the LVCMOS output drivers is set by the voltage on the VDDO pin for the respective bank.
3.5.5 LVCMOS Output Polarity
When a driver is configured as an LVCMOS output it generates a clock signal on both pins (OUTx and OUTxb). By default, the
clock on the OUTxb pin is generated in phase with the clock on the OUTx pin. The polarity of these clocks is configurable enabling
complimentary clock generation and/or inverted polarity with respect to other output drivers.
3.5.6 Output Enable/Disable
The universal hardware input pins can be programmed to operate as output enable (OEb), controlling one or more outputs. Pin
assignment is done using ClockBuilder Pro. An output enable pin provides a convenient method of disabling or enabling the output
drivers. When the output enable pin is held high all designated outputs will be disabled. When held low, the designated outputs will be
enabled.
3.5.7 Differential Output Configurable Skew Settings
Skew on the differential outputs can be independently configured. The skew is adjustable in 35 ps steps across a range of 245 ps.
3.5.8 Synchronous Output Disable Feature
Output clocks are always enabled and disabled synchronously. The output will wait until a clock period has completed before the driver
is disabled. This prevents unwanted runt pulses from occurring when disabling an output.
Si5332 Data Sheet • Functional Description
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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Rev. 1.3 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 16, 2021
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