Overview
Description
The 8T79S308 is a fully integrated signal fanout buffer for high-performance, low additive phase noise applications. The main function of the device is the distribution and fanout of high-frequency clocks or low-frequency synchronization signals. The 8T79S308 is optimized to deliver very low phase noise clocks and precise, low-skew outputs, low device-to-device skew characteristics and fast output rise/fall times help the system design to achieve deterministic clock phase relationship across devices.
The device distributes the input signals (IN_0, IN_1) to two fanout banks. A input select logic allows the device to operate as 1:8 buffer, dual 1:4 buffers, and to cross the input signals. The propagation delay in both outputs banks is designed for equal delay to support fixed phase relationships between both banks. All outputs are very flexible in LVPECL/LVDS output style configuration, output signal termination, and allow both DC and AC coupling. Outputs can be individually disabled through a serial interface.
The device is packaged in a lead-free (RoHS 6) 40-VFQFPN package. The extended temperature range supports wireless infrastructure, telecommunication, and networking end equipment requirements. The 8T79S308 is a member of the high-performance clock family from IDT.
Features
- High-performance, flexible clock/data/1PPS fanout buffer
- Low phase noise floor: -160dBc/Hz (156.56MHz clock)
- Integrated phase noise of 50fs RMS typical (12kHz–20MHz)
- Flexible input selection (single fanout, dual buffer, switch)
- Eight differential outputs, organized in two banks of four outputs
- Low-power LVPECL/LVDS outputs
- Individually configured outputs through an I2C interface (style, amplitude, enable)
- Supported clock frequency range: 0 to 3GHz
- 3.3V/2.5V core and 3.3V/2.5V/1.8V output supply voltage
- Selectable I2C I/O interface voltage: 1.8V and VDD
- Integrated low dropout regulators (LDOs) for excellent power supply noise rejection
- Package: 6 × 6 mm 40-VFQFPN
- Temperature range: -40°C to +105°C
Comparison
Applications
Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| VFQFPN | 40 | I | Yes | Tray | 3 | Get Samples, | ||
| VFQFPN | 40 | I | Yes | Reel | 3 | |||
| VFQFPN | 40 | I | Yes | Reel | 3 |
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Videos & Training
Introduction to Timing Commander™ Software Tool by IDT
Description
IDT's innovative support tool, Timing Commander™, expedites development cycles by empowering customers to program sophisticated timing devices with an intuitive and flexible Graphical User Interface. IDT's Timing Commander is a Windows™-based platform designed to serve user-friendly configuration interfaces, known as personalities, for various IDT products and product families. With a few simple clicks, the user is presented with a comprehensive, interactive block diagram offering the ability to modify desired input values, output values, and other configuration settings. The software automatically makes calculations, reports status monitors, and prepares register settings without the need to reference a datasheet. The tool also automatically loads the configuration settings over USB to an IDT evaluation board for immediate application in the circuit. Once the device has been configured and tuned for optimal system performance, the configuration file can be saved for factory-level programming prior to shipment. Presented by Steven Gutierrez, Senior Product Application Engineer at IDT. For more information, visit our Timing Commander page.
Transcript
Hi, I'm Stephen Gutierrez, and over the course of the next few minutes, I will be sharing with you some of the features of Timing Commander, the new support tool for I.D.T. timing products.
Timing commander can support a single device or a family of devices from a single file. Currently, we are viewing a family of devices from the U.F.T. product line, and for this demo, we will be using the IDT-8T49N-283 device.
Timing Commander provides complete documentation that allows users to understand the function of each setting without having to consult the data sheet. As the user hovers over an element via a specific setting or a functional block, a tool tip containing detailed information appears. Many of the I.D.T timing products are complex, highly configurable devices. Timing Commander simplifies this configuration process by making the commonly used settings available at the top level.
In this case, all the user has to enter are the input frequencies and the output frequencies. As you have just noticed, the built-in optimization algorithm has configured the device on the fly, updating the functional blocks and the diagram with each of my inputs. Aside from providing information about valid settings, Timing Commander also validates the user inputs to ensure that they remain within the data sheet's specifications.
Here I have entered an invalid setting, and Timing Commander displays an error message plus a link that will direct me to the location of that error. Once corrected, the error message goes away. For users that want to access more detailed settings, Timing Commander provides a search tool that will help them quickly locate the settings.
For example, when searching for gain, Timing Commander will highlight the functional blocks and the setting that match the search term. In addition to the diagram view, Timing Commander also provides a bit-set view and a register view. The bit-set view displays the device settings with descriptive names and detailed information. The user can click on a bit-set to view more details or also search for a term. In addition to the bit-set view, the register view will allow a user to change individual settings.
The nice feature is that changes made in the bit-set view or register view will reflect back on the block diagram. In certain product families, Timing Commander offers additional tools and features, such as schematic symbols, termination guidelines, power calculations, and configuration specific phase noise simulations.
Timing Commander is an all-in-one resource for device information containing information from data sheets, modeling software, and simulation tools. Timing Commander and all supporting materials are available on IDT.com/go/TimingCommander.
Video List
