MC10H641FNR2G

Clock Buffers, Drivers Overview

The MC10H641FNR2G is a single-supply, low-skew translating 1:9 clock driver manufactured by onsemi. It converts PECL inputs to TTL outputs within a PLCC-28 package. The device operates on a single +5.0 V supply with separate ECL and TTL power pins. Key electrical parameters include a maximum input frequency of 65 MHz at 50 pF load, propagation delays ranging from 4.86 ns to 6.43 ns depending on temperature, and output drive capabilities of 24 mA. It features differential ECL internal design, logic enable, latch enable, and a VBB reference output for single-ended use.

Clock Buffers, Drivers Feature Summary

• Translates PECL inputs to TTL outputs with guaranteed low skew specifications.
• Features a latched input mechanism controlled by LEN and EN pins.
• Includes a VBB output pin to facilitate single-ended input configurations.
• Operates on a single +5.0 V supply with dedicated ECL and TTL power domains.

Clock Buffers, Drivers Applications

• Low skew clock distribution networks in high-speed digital systems.
• PECL to TTL level translation interfaces.
• Clock fan-out buffering for multiple TTL loads.

Clock Buffers, Drivers Procurement Notes

Verify the 'G' suffix indicates a Pb-Free package compliant with RoHS standards. Confirm the 'R2' suffix corresponds to Tape & Reel packaging containing 500 units per reel. Ensure the specific revision (Rev.7) matches the required documentation version for design-in validation.

Clock Buffers, Drivers Selection Notes

Select this component when a 1:9 split ratio between PECL source and TTL destinations is required. Evaluate thermal resistance and airflow conditions to determine junction temperature, as AC characteristics are specified based on junction temperature rather than ambient temperature. Ensure load capacitance does not exceed 50 pF for guaranteed timing parameters.

Clock Buffers, Drivers Part Context

This part belongs to the H641 translator series designed for optimal power pinning and signal flow. It serves as the PECL-TTL variant of the popular ECLinPS family. The device utilizes the PLCC-28 package (Case 776) to support separate power supplies for ECL and TTL sections, minimizing noise coupling between logic domains.

Clock Buffers, Drivers Replacement Considerations

The MC100H641FNR2G is functionally equivalent but compatible with positive 100K logic levels instead of MECL 10H levels. Both share identical pinouts and electrical characteristics regarding the TTL output stage and skew performance.

Clock Buffers, Drivers FAQ

How is the VBB pin utilized?

The VBB pin provides a positive ECL reference voltage output. For single-ended input applications, it should be connected to the D input and bypassed with a 0.01 µF capacitor.

What determines the propagation delay variation?

Propagation delay varies with junction temperature, supply voltage (VCC), and capacitive load. The datasheet specifies limits based on junction temperature, requiring calculation of thermal resistance and power dissipation for precise skew estimation.

What is the function of the LEN and EN pins?

LEN (Latch Enable) controls the transparency of the input latch; when LOW, the latch is transparent. EN (Enable) forces all outputs LOW when HIGH. Both are positive ECL inputs.