Overview
The MC100LVEL14DWG is a 3.3 V ECL 1:5 clock distribution chip designed by onsemi for low skew clock distribution applications. This device is functionally and pin compatible with the EL14 but is optimized for operation in ECL or PECL mode, supporting a voltage supply range of −3.0 V to −3.8 V or 3.0 V to 3.8 V. It features a multiplexed clock input, allowing for the distribution of both high-speed system clocks and lower-speed scan or test clocks. The chip includes synchronous enable/disable functionality to prevent runt clock pulses and internal input pulldown resistors for stable operation.
Key Specifications
| Symbol | Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| fmax | Maximum Toggle Frequency | > 1 | > 1 | > 1 | GHz |
| tPLH | Propagation Delay (CLK to Q, Diff) | 520 | 470 | 580 | ps |
| tPHL | Propagation Delay (CLK to Q, SE) | 720 | 770 | 830 | ps |
| tSKEW | Within-Device Skew | 50 | 50 | 50 | ps |
| tJITTER | Random Clock Jitter (RMS) @ 1 GHz | 0.2 | < 1 | ||
| IEE | Power Supply Current | 32 | 40 | 42 | mA |
| VOH | Output HIGH Voltage | 2215 | 2295 | 2420 | mV |
| VOL | Output LOW Voltage | 1470 | 1605 | 1745 | mV |
| VIH | Input HIGH Voltage (Single-Ended) | 2135 | 2420 | 2420 | mV |
| VIL | Input LOW Voltage (Single-Ended) | 1490 | 1825 | 1825 | mV |
| VBB | Output Voltage Reference | 1.92 | 2.04 | 2.04 | V |
Key Features
- Low skew 1:5 clock distribution
- Support for differential or single-ended ECL and PECL input signals
- Multiplexed clock input for high-speed system clocks and lower-speed scan or test clocks
- Synchronous enable/disable to prevent runt clock pulses
- Internal input pulldown resistors
- ESD Protection: Human Body Model > 2 kV
- Temperature compensation
- Meets or exceeds JEDEC Spec EIA/JESD78 IC Latchup Test
- Moisture Sensitivity: Level 3 (Pb-Free)
- Flammability Rating: UL 94 V−0 @ 0.125 in, Oxygen Index: 28 to 34
- Pb-Free, Halogen Free, and RoHS Compliant
Applications
The MC100LVEL14DWG is suitable for various applications requiring precise clock distribution, including:
- High-speed data processing systems
- Telecommunication equipment
- Networking devices
- Test and measurement instruments
- High-performance computing systems
Q & A
- What is the primary function of the MC100LVEL14DWG?
The MC100LVEL14DWG is a low skew 1:5 clock distribution chip designed for precise clock distribution in high-speed applications.
- What types of input signals can the MC100LVEL14DWG support?
The device can be driven by either differential or single-ended ECL or PECL input signals.
- What is the operating voltage range for the MC100LVEL14DWG?
The device operates within a voltage supply range of −3.0 V to −3.8 V or 3.0 V to 3.8 V.
- What is the purpose of the SEL pin?
The SEL pin selects the differential clock input when it is LOW or left open and pulled LOW by the input pulldown resistor.
- How does the synchronous enable/disable feature work?
The common enable (EN) is synchronous, ensuring that outputs are only enabled/disabled when they are already in the LOW state, preventing runt clock pulses.
- What is the significance of the VBB pin?
The VBB pin provides a reference voltage output and can rebias AC coupled inputs. It should be decoupled from VCC via a 0.01 μF capacitor.
- What are the key specifications for output skew and jitter?
The device has a within-device skew of 50 ps and random clock jitter (RMS) of less than 1 ps at 1 GHz.
- Is the MC100LVEL14DWG environmentally friendly?
Yes, the device is Pb-Free, Halogen Free, and RoHS Compliant.
- What is the maximum toggle frequency of the MC100LVEL14DWG?
The maximum toggle frequency is greater than 1 GHz.
- What are the typical termination requirements for the output drivers?
Outputs should be terminated through a 50 Ω resistor to VCC − 2.0 V, as described in the application notes.
