8538BG-31LFT

Overview

The 8538BG-31LFT is a low skew, high-performance 1-to-8 crystal oscillator/LVCMOS-to-3.3V LVPECL fanout buffer manufactured by Renesas Electronics Corporation. It features selectable single-ended clock or crystal inputs, accepting LVCMOS or LV TTL levels and translating them to 3.3V LVPECL outputs. The device provides eight differential 3.3V LVPECL outputs with a maximum output frequency of 266MHz. Key electrical parameters include a maximum output skew of 50ps, part-to-part skew of 250ps, and propagation delay of 2.2ns. It operates on a 3.3V supply within an ambient temperature range of 0°C to 70°C.

Feature Summary

• Eight differential 3.3V LVPECL outputs
• Selectable LVCMOS/LVTTL clock or crystal inputs (14MHz - 40MHz)
• Maximum output frequency of 266MHz
• Output skew: 50ps (max); Part-to-part skew: 250ps (max)

Applications

• Clock distribution in high-speed digital systems
• Crystal oscillator buffering for LVPECL loads
• LVCMOS/LVTTL to LVPECL voltage translation

Procurement Notes

Verify the specific suffix 'LFT' against official Renesas documentation to confirm lead-free status and tape-and-reel packaging configuration. Ensure the ordering code matches the exact package type required for the design. Cross-reference with the current datasheet revision to confirm active status and any potential process changes.

Selection Notes

Select this component when eight synchronized LVPECL outputs are required from a single LVCMOS, LVTTL, or crystal source. Verify that the input signal frequency falls within the 14MHz to 40MHz range if using a crystal, or up to 266MHz for clock inputs. Confirm that the 50ps output skew specification meets the system timing requirements.

Part Context

This part belongs to the 8538-31 series of low skew fanout buffers. It is functionally related to other variants in the family, such as the 8538-31, which shares similar core specifications but may differ in package options or suffix designations. The series is designed for applications demanding well-defined performance and repeatability in clock distribution networks.

Replacement Considerations

Direct functional replacements within the same family include the 8538-31. Verify pin compatibility and electrical specifications before substitution. No other public confirmed substitute part numbers are identified in the provided data.