NB3L208K: 2.5V, 3.3V Differential 1:8 HCSL Fanout Buffer
The NB3L208K is a differential 1:8 Clock fanout buffer with
High−speed Current Steering Logic (HCSL) outputs. Inputs can
directly accept differential LVPECL, LVDS, and HCSL signals.
Single−ended LVPECL, HCSL, LVCMOS, or LVTTL levels are
accepted with a proper external Vth reference supply per Figures 4
and 6. The input signal will be translated to HCSL and provides eight
identical copies operating up to 350 MHz.
The NB3L208K is optimized for ultra−low phase noise, propagation
delay variation and low output–to–output skew, and is DB800H
compliant. As such, system designers can take advantage of the
NB3L208K’s performance to distribute low skew clocks across the
backplane or the motherboard making it ideal for Clock and Data
distribution applications such as PCI Express, FBDIMM, Networking,
Mobile Computing, Gigabit Ethernet, etc.
Output drive current is set by connecting a 475 resistor from
IREF (Pin 27) to GND per Figure 11. Outputs can also interface to
LVDS receivers when terminated per Figure 12.
Features- Maximum Input Clock Frequency > 350 MHz
- 2.5 V ±5% / 3.3 V ±10% Supply Voltage Operation
- 8 HCSL Outputs
- DB800H Compliant
- Individual OE Control Pin for Each Bank of 2 Outputs
- 100 ps Max Output−to−Output Skew Performance
- 1 ns Typical Propagation Delay
- 450 ps Typical Rise and Fall Times
- 80 fs Maximum Additive Phase Jitter RMS
|
Applications- Mobile Computing
- Networking
- Gigabit Ethernet
- FBDIMM
- PCI Express
|
Application Notes (5)
Package Drawings (1)
Simulation Models (2)
Evaluation Board Documents (1)
Data Sheets (1)
Evaluation/Development Tool Information
| Product | Status | Compliance | Short Description |
|---|
| NB3L208KMNGEVB | Active | | 1:8 HCSL Fanout Buffer Evaluation Board |
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| NB3L208KMNG | Active | Pb-free
Halide free | QFN-32 | 488AM | 1 | Tube | 74 | Contact BDTIC |
| NB3L208KMNTXG | Active | Pb-free
Halide free | QFN-32 | 488AM | 1 | Tape and Reel | 1000 | Contact BDTIC |
Specifications
| Product | Type | Channels | Input / Output Ratio | Input Level | Output Level | VCC Typ (V) | tJitterRMS Typ (ps) | tskew(o-o) Max (ps) | tpd Typ (ns) | tR & tF Max (ps) | fmaxClock Typ (MHz) | fmaxData Typ (Mbps) |
|---|
| NB3L208KMNG | Buffer | 1 | 1:8 | HCSL
LVPECL
LVDS | HCSL | 2.5
3.3 | 0.046 | 20 | 1 | 700 | 350 | |
| NB3L208KMNTXG | Buffer | 1 | 1:8 | LVDS
HCSL
LVPECL | HCSL | 2.5
3.3 | 0.046 | 20 | 1 | 700 | 350 | |
