LMK00338 LMK00338 8-Output PCIe Gen1/2/3 Clock Buffer/Level Translator | TI.com

LMK00338
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
LMK00338 8-Output PCIe Gen1/2/3 Clock Buffer/Level Translator

 

Recommended alternative parts

  • LMK00308  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Low additive jitter ,1:8 Universal differential buffer that can support HCSL

Description

The LMK00338 device 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 or 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.

Features

  • 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
  • VCC Core Supply: 3.3 V ± 5%
  • 3 Independent VCCO Output Supplies: 3.3 V/2.5 V ± 5%
  • Industrial Temperature Range: –40°C to +85°C
  • 40-lead WQFN (6 mm × 6 mm)

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Design with LMK00338

Frequency Number of Outputs
 MHz
Output Format

Parametrics

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Part number Order Function Additive RMS jitter (Typ) (fs) Output frequency (Max) (MHz) Number of outputs VCC out (V) VCC core (V) Output skew (ps) Features Operating temperature range (C) Rating Output type Package Group Package size: mm2:W x L (PKG) Input type
LMK00338 Order now Differential
Fanout    
30     400     8     2.5
3.3    
3.3     50     PCIe 3.0 Compliant     -40 to 85     Catalog     HCSL
LVCMOS    
WQFN | 40     40WQFN: 36 mm2: 6 x 6 (WQFN | 40)     CML
HCSL
HSTL
LVCMOS
LVDS
LVPECL
LVTTL
SSTL
XTAL    
CDCDB2000 Order now Differential     80     250     20     3.3     3.3     50     1:20 fanout
PCIe Gen 1-5 compliance
DB2000QL compliant
SMBus control
Side-Band Interface
OE# control    
-40 to 85     Catalog     LP-HCSL     TLGA | 80     80TLGA: 36 mm2: 6 x 6 (TLGA | 80)     LP-HCSL    
CDCUN1208LP Order now Differential
Fanout    
200     400     8     1.8
2.5
3.3    
1.8
2.5
3.3    
50     3.3-V VCC/VDD
I2C interface
Pin programmable    
-40 to 85     Catalog     HCSL     VQFN | 32     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)     HCSL    
CDCV304 Order now Single-ended     56     200     4     2.5
3.3    
2.5
3.3    
150     1:4 fanout     -40 to 85     Catalog     LVTTL     TSSOP | 8     8TSSOP: 19 mm2: 6.4 x 3 (TSSOP | 8)     LVTTL    
LMK00334 Order now Differential
Fanout    
30     400     4     2.5
3.3    
3.3     50     PCIe Gen 4 Compliant     -40 to 85     Catalog     HCSL
LVCMOS    
WQFN | 32     32WQFN: 25 mm2: 5 x 5 (WQFN | 32)     CML
HCSL
HSTL
LVCMOS
LVDS
LVPECL
SSTL
XTAL