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LMK00338 Datasheet(PDF) 13 Page - Texas Instruments

Part No. LMK00338
Description  8-Output Differential Clock Buffer/Level Translator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMK00338 Datasheet(HTML) 13 Page - Texas Instruments

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LMK00338
www.ti.com
SNAS636A – DECEMBER 2013 – REVISED OCTOBER 2014
Feature Description (continued)
8.3.2 Clock Inputs
The input clock can be selected from CLKin0/CLKin0*, CLKin1/CLKin1*, or OSCin. Clock input selection is
controlled using the CLKin_SEL[1:0] inputs as shown in Table 1. Refer to Driving the Clock Inputs for clock input
requirements. When CLKin0 or CLKin1 is selected, the crystal circuit is powered down. When OSCin is selected,
the crystal oscillator circuit will start-up and its clock will be distributed to all outputs. Refer to Crystal Interface for
more information. Alternatively, OSCin may be be driven by a single-ended clock (up to 250 MHz) instead of a
crystal.
Table 1. Input Selection
CLKin_SEL1
CLKin_SEL0
SELECTED INPUT
0
0
CLKin0, CLKin0*
0
1
CLKin1, CLKin1*
1
X
OSCin
Table 2 shows the output logic state vs. input state when either CLKin0/CLKin0* or CLKin1/CLKin1* is selected.
When OSCin is selected, the output state will be an inverted copy of the OSCin input state.
Table 2. CLKin Input vs. Output States
STATE of
STATE of
SELECTED CLKin
ENABLED OUTPUTS
CLKinX and CLKinX*
Logic low
inputs floating
CLKinX and CLKinX*
Logic low
inputs shorted together
CLKin logic low
Logic low
CLKin logic high
Logic high
8.3.3 Clock Outputs
The HCSL output buffer for Bank A and Bank B outputs can be separately disabled to Hi-Z using the
CLKoutA_EN and CLKoutB_EN inputs, respectively, as shown in Table 3. For applications where all differential
outputs are not needed, any unused output pin should be left floating with a minimum copper length (see note
below) to minimize capacitance and potential coupling and reduce power consumption. If an entire output bank
will not be used, it is recommended to disable/Hi-Z the bank to reduce power. Refer to Termination and Use of
Clock Drivers for more information on output interface and termination techniques.
NOTE
For best soldering practices, the minimum trace length for any unused output pin should
extend to include the pin solder mask. This way during reflow, the solder has the same
copper area as connected pins. This allows for good, uniform fillet solder joints helping to
keep the IC level during reflow.
Table 3. Differential Output Buffer Type Selection
CLKoutX BUFFER TYPE
CLKoutX_EN
(BANK A or B)
0
HCSL
1
Disabled (Hi-Z)
Copyright © 2013–2014, Texas Instruments Incorporated
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