LMK00338_14 Datasheet, PDF (1/33 Pages) Texas Instruments – 8-Output Differential Clock Buffer/Level Translator

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LMK00338
SNAS636A – DECEMBER 2013 – REVISED OCTOBER 2014
LMK00338 8-Output Differential Clock Buffer/Level Translator
1 Features
•1 3:1 Input Multiplexer
– Two Universal Inputs Operate up to 400 MHz
and Accept LVPECL, LVDS, CML, SSTL,
HSTL, HCSL, or Single-ended Clocks
– One Crystal Input Accepts a 10 MHz to 40
MHz Crystal or Single-Ended Clock
• Two Banks with 4 Differential Outputs Each
– HCSL, or Hi-Z (Selectable per Bank)
– Additive RMS Phase Jitter for PCIe Gen3 at
100 MHz:
– 30 fs RMS (Typical)
• -72 dBc at 156.25 MHz
• LVCMOS Output with Synchronous Enable Input
• Pin-Controlled Configuration
• V_CC Core Supply: 3.3 V ± 5%
• 3 Independent V_CCO Output Supplies: 3.3 V/2.5 V
± 5%
• Industrial Temperature Range: -40°C to +85°C
• 40-lead WQFN (6 mm x 6 mm)
2 Applications
• Clock Distribution and Level Translation for ADCs,
DACs, Multi-Gigabit Ethernet, XAUI, Fibre
Channel, SATA/SAS, SONET/SDH, CPRI, High-
Frequency Backplanes
• Switches, Routers, Line Cards, Timing Cards
• Servers, Computing, PCI Express (PCIe 3.0)
• Remote Radio Units and Baseband Units
3 Description
The LMK00338 is an 8-output PCIe Gen1/Gen2/Gen3
fanout buffer intended for high-frequency, low-jitter
clock/data distribution and level translation. The input
clock can be selected from two universal inputs or
one crystal input. The selected input clock is
distributed to two banks of 4 HCSL outputs and one
LVCMOS output. The LVCMOS output has a
synchronous enable input for runt-pulse-free
operation when enabled or disabled. The LMK00338
operates from a 3.3 V core supply and 3 independent
3.3 V/2.5 V output supplies.
The LMK00338 provides high performance,
versatility, and power efficiency, making it ideal for
replacing fixed-output buffer devices while increasing
timing margin in the system.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMK00338
WQFN (40)
6.00 mm × 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
LMK00338 Functional Block Diagram
CLKoutA_EN
CLKoutB_EN
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.