Overview
The LMK00338RTAR, produced by Texas Instruments, is an 8-output PCIe Gen1/Gen2/Gen3/Gen4/Gen5 clock buffer and level translator. This device is designed for high-frequency, low-jitter clock distribution and level translation, making it ideal for various high-speed applications. It features a 3:1 input multiplexer, allowing selection from two universal inputs or one crystal input, and distributes the selected clock to two banks of four HCSL outputs and one LVCMOS output. The device operates from a 3.3-V core supply and three independent 3.3-V or 2.5-V output supplies, ensuring high performance, versatility, and power efficiency.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Frequency Range | DC to 400 MHz | Hz |
| Input Types | LVPECL, LVDS, CML, SSTL, HSTL, HCSL, Single-Ended | - |
| Output Types | HCSL, LVCMOS | - |
| Core Supply Voltage | 3.3 V ± 5% | V |
| Output Supply Voltages | 3.3 V ± 5%, 2.5 V ± 5% | V |
| Operating Temperature Range | –40°C to +85°C | °C |
| Package Type | 40-lead WQFN (6 mm × 6 mm) | - |
| Additive RMS Phase Jitter (PCIe Gen5 at 100 MHz) | 15 fs (Typical) | fs |
| Power Supply Ripple Rejection (PSRR) at 156.25 MHz | –72 dBc | dBc |
Key Features
- 3:1 Input Multiplexer: Allows selection from two universal inputs or one crystal input.
- High-Speed Inputs: Accepts LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks up to 400 MHz.
- Dual Output Banks: Two banks with four differential HCSL outputs each, and one LVCMOS output.
- Low Jitter: Additive RMS phase jitter for PCIe Gen5 at 100 MHz is 15 fs (Typical).
- Flexible Power Supplies: 3.3-V core supply and three independent 3.3-V or 2.5-V output supplies.
- Industrial Temperature Range: Operates from –40°C to +85°C.
- Pin-Controlled Configuration: Allows for flexible configuration through pin controls.
- Synchronous Enable Input: LVCMOS output has a synchronous enable input for runt-pulse-free operation.
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, 4.0, 5.0).
- Remote Radio Units and Baseband Units.
Q & A
- What is the input frequency range of the LMK00338RTAR?
The input frequency range is from DC to 400 MHz.
- What types of input clocks can the LMK00338RTAR accept?
The device accepts LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks.
- What are the output types of the LMK00338RTAR?
The device provides HCSL and LVCMOS outputs.
- What is the core supply voltage of the LMK00338RTAR?
The core supply voltage is 3.3 V ± 5%.
- What are the operating temperature ranges for the LMK00338RTAR?
The device operates from –40°C to +85°C.
- What is the package type of the LMK00338RTAR?
The device is packaged in a 40-lead WQFN (6 mm × 6 mm).
- What is the additive RMS phase jitter for PCIe Gen5 at 100 MHz?
The additive RMS phase jitter is 15 fs (Typical).
- What is the power supply ripple rejection (PSRR) at 156.25 MHz?
The PSRR is –72 dBc.
- What are some common applications of the LMK00338RTAR?
Common applications include clock distribution and level translation for various high-speed interfaces, servers, computing, and remote radio units.
- How does the LMK00338RTAR handle output configuration?
The device allows for pin-controlled configuration and has synchronous enable inputs for runt-pulse-free operation.
