Crystal-to-3.3V, 2.5V Multiple Frequency Clock Generator with Fanout Buffer
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Overview
Description
The 8T49N028 is a low RMS phase jitter Clock Synthesizer with selectable internal crystal oscillator or external clock references and eight outputs, configurable as either LVDS, LVPECL or High Impedance.
After power up, two frequency select pins determine one of up to four different sets of factory preprogrammed crystal or input frequency and output frequency configurations. From a single input reference, as many as three different output frequencies may be selected for the output banks: two of these frequencies can be generated by the internal crystal oscillator, and/or external clock pre-divider, and/or A output divider, and/or B output divider. The third output frequency is from the B output divider. Device pre-programming can be overwritten through the provided I2C interface.
Examples of valid frequency configuration setups illustrate this device's flexibility, and are shown in Table 3A. The specific internal register settings for each of the four frequency sets are specified by a Renesas order code. Custom codes can be provided by contacting Renesas.
Features
- Fourth Generation FemtoClock NG PLL technology
- Eight selectable LVPECL or LVDS outputs (bank selectable, two output channels per bank)
- CLK, nCLK input pair can accept the following differential input levels: LVPECL, LVDS, HCSL
- FemtoClock NG VCO Range: 1.92GHz–2.5GHz
- Bank A and B output frequencies are mux selectable from internal crystal oscillator, reference clock input, output divider A or output divider B
- Clock from OUTPUT DIVIDER A, RMS phase jitter at 156.25MHz
(12KHz–20MHz): 225fs (typical) - Clock from OUTPUT DIVIDER B, RMS phase jitter at 156.25MHz
(12KHz–20MHz): 219fs (typical) - Clock from OUTPUT DIVIDER B, RMS phase jitter at 156.25MHz
(10kHz–1MHz): 165fs (typical) Full 2.5V or 3.3V power supply - Full 2.5V or 3.3V power supply
- I2C programming interface
- PCI Express (2.5Gb/S), Gen2 (5Gb/s) and Gen3 (8Gb/s) jitter compliant
- -40°C to 85°C ambient operating temperature
- Lead-free (RoHS 6) packaging
Documentation
| Document title | Document type
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Date Date | |
|---|---|---|---|
| PDF 1.62 MB | Datasheet | ||
| PDF 91 KB | Application Note | ||
| PDF 1.99 MB | Application Note | ||
| PDF 322 KB | Application Note | ||
| PDF 395 KB | Application Note | ||
| PDF 170 KB | Application Note | ||
| PDF 133 KB | Application Note | ||
| PDF 495 KB | Application Note | ||
| PDF 442 KB | Application Note | ||
| PDF 115 KB | Application Note | ||
| PDF 233 KB | Application Note | ||
| PDF 131 KB | Application Note | ||
| PDF 180 KB | Application Note | ||
| PDF 153 KB | Application Note | ||
| PDF 160 KB | Application Note | ||
| PDF 120 KB | Application Note | ||
| PDF 133 KB | Application Note | ||
| PDF 143 KB | Application Note | ||
| PDF 565 KB | Application Note | ||
| PDF 136 KB | Application Note | ||
| PDF 202 KB | Application Note | ||
| PDF 438 KB | Application Note | ||
| PDF 108 KB | Application Note | ||
| PDF 140 KB | Manual - Hardware | ||
| PDF 1.83 MB | Overview | ||
| PDF 983 KB | Product Change Notice | ||
| PDF 583 KB | Product Change Notice | ||
| PDF 941 KB | Product Change Notice | ||
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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.
Product Options
Processing table
| VFQFPN | 48 | I | Yes | Tray | Get Samples, | |
| VFQFPN | 48 | I | Yes | Reel |
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