MC100E310FNR2G

Clock Buffers, Drivers Overview

The MC100E310FNR2G is a low voltage, low skew differential ECL fanout buffer designed for clock distribution. It features two selectable differential clock inputs (CLKa/CLKb) and provides eight differential outputs with a 2:8 ratio. The device operates in PECL mode with VCC = 4.2 V to 5.7 V or NECL mode with VEE = -4.2 V to -5.7 V. Maximum toggle frequency is 900 MHz at 25°C. Typical within-device skew is 50 ps, and part-to-part skew is 200 ps. It includes an internal reference voltage output (VBB), input pulldown resistors, and ESD protection exceeding 2 kV HBM. The component is housed in a 28-lead PLCC package.

Clock Buffers, Drivers Feature Summary

• Dual differential clock inputs allow selection between CLKa and CLKb via the CLK_SEL pin.
• Low skew performance with typical within-device skew of 50 ps and part-to-part skew of 200 ps.
• Internal VBB reference voltage output available for single-ended input biasing or AC coupling rebiasing.
• RoHS compliant, lead-free, and halogen-free construction.

Clock Buffers, Drivers Applications

• Clock distribution networks requiring redundant or test clock paths.
• High-speed digital systems utilizing PECL or NECL logic families.
• Applications demanding minimal device and system skew for precise timing.

Clock Buffers, Drivers Procurement Notes

Verify that the specific order suffix 'R2G' corresponds to the Tape & Reel packaging format containing 500 units per reel. Confirm RoHS compliance status as the datasheet indicates Pb-Free and Halogen Free characteristics for this marking. Ensure power supply connections for all VCC, VCCO, and VEE pins are externally connected to guarantee proper operation.

Clock Buffers, Drivers Selection Notes

Select this component when dual independent clock sources are required for redundancy or testing within a single buffer stage. The 2:8 fanout ratio suits designs needing one signal distributed to eight destinations. Consider the 50 ps typical skew for tight timing budgets. Verify compatibility with PECL (+5V) or NECL (-5V) supply configurations based on system architecture.

Clock Buffers, Drivers Part Context

The MC100E310 belongs to the onsemi 100E Series, which contains temperature compensation. This series is part of the ECLinPS family of high-performance ECL devices. The FNR2G suffix denotes the 28-lead PLCC package variant supplied in tape and reel format, distinct from the tube-packaged FNG version.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Designers should consult application notes AN1406/D and AND8003/D for interfacing guidelines and moisture sensitivity handling if replacing existing inventory.

Clock Buffers, Drivers FAQ

How is the second clock input selected?

The CLK_SEL pin determines the active input. A logic low selects CLKa, while a logic high selects CLKb.

What is the function of the VBB pin?

VBB provides an internally generated reference voltage. It can be used to bias unused differential inputs for single-ended operation or to rebias AC-coupled inputs. It must be decoupled with a 0.01 µF capacitor if used.

What is the maximum operating frequency?

The maximum toggle frequency (fMAX) is 900 MHz at 25°C, with a minimum guaranteed specification of 700 MHz across the operating temperature range.