Overview
The LMK00804B, produced by Texas Instruments, is a high-performance clock fanout buffer designed to distribute up to four LVCMOS/LVTTL outputs at various voltage levels (3.3-V, 2.5-V, 1.8-V, or 1.5-V). This device is characterized by its low skew and high accuracy, making it ideal for applications that demand precise clock signal distribution. It features two selectable inputs that can accept differential or single-ended signals, including LVPECL, LVDS, HCSL, SSTL, LVHSTL, and LVCMOS/LVTTL. The clock enable input is synchronized internally to prevent runt or glitch pulses on the outputs, and a separate output enable terminal allows control over the output state.
Key Specifications
| Specification | Value |
|---|---|
| Package | 16-Lead TSSOP |
| Operating Temperature Range | -40°C to 85°C |
| Output Frequency | Up to 350 MHz |
| Output Skew | 35 ps (max) |
| Part-to-Part Skew | 700 ps (max) |
| Additive Jitter | 0.04 ps RMS (typ) @ 125 MHz |
| Noise Floor | -166 dBc/Hz (typ) @ 125 MHz |
| Output Impedance | 7 Ω |
| Core/Output Power Supplies | 3.3 V/3.3 V, 3.3 V/2.5 V, 3.3 V/1.8 V, 3.3 V/1.5 V |
Key Features
- Four LVCMOS/LVTTL outputs with 7 Ω output impedance
- Two selectable inputs accepting LVPECL, LVDS, HCSL, SSTL, LVHSTL, or LVCMOS/LVTTL signals
- Synchronous clock enable to prevent runt or glitch pulses
- Separate output enable terminal for controlling output state
- Low additive jitter and noise floor
- Guaranteed output and part-to-part skew characteristics
- Industrial temperature range: -40°C to +85°C
Applications
The LMK00804B is suitable for various high-performance applications requiring precise clock signal distribution, such as:
- Telecommunication systems
- Data centers and server systems
- High-speed data acquisition and processing systems
- Networking equipment
- Embedded systems requiring low skew and high accuracy clock signals
Q & A
- What is the maximum output frequency of the LMK00804B?
The maximum output frequency is up to 350 MHz. - What types of input signals can the LMK00804B accept?
The device can accept LVPECL, LVDS, HCSL, SSTL, LVHSTL, and LVCMOS/LVTTL input signals. - What is the output impedance of the LMK00804B?
The output impedance is 7 Ω. - How many outputs does the LMK00804B provide?
The device provides up to four LVCMOS/LVTTL outputs. - What is the operating temperature range of the LMK00804B?
The operating temperature range is -40°C to 85°C. - What is the typical additive jitter of the LMK00804B at 125 MHz?
The typical additive jitter is 0.04 ps RMS. - How does the clock enable feature work on the LMK00804B?
The clock enable input is synchronized internally to eliminate runt or glitch pulses on the outputs when the clock enable terminal is asserted or de-asserted. - What is the part-to-part skew of the LMK00804B?
The part-to-part skew is 700 ps (max). - What are the core/output power supply options for the LMK00804B?
The options include 3.3 V/3.3 V, 3.3 V/2.5 V, 3.3 V/1.8 V, and 3.3 V/1.5 V. - What is the package type of the LMK00804B?
The package type is 16-Lead TSSOP.
