8V79S674NLGI

Clock Buffers, Drivers Overview

The 8V79S674NLGI is a clock divider and fanout buffer utilizing SiGe technology for high-frequency operation and low phase noise. It accepts differential LVCMOS or LVTTL inputs and provides four low-skew LVPECL outputs. The device supports frequency division ratios of ÷1, ÷2, ÷4, and ÷8, with a maximum output frequency of 2500 MHz in the ÷1 configuration. It operates on dual power supplies: 3.135V to 3.465V (nominal 3.3V) and 2.375V to 2.625V (nominal 2.5V). Packaged in a 20-lead VFQFN with an exposed pad, it functions within an ambient temperature range of -40°C to 85°C.

Clock Buffers, Drivers Feature Summary

• SiGe technology optimized for high clock frequencies and fast signal rise/fall times.
• Four differential LVPECL outputs with maximum output skew of 50 ps.
• Configurable frequency division by ÷1, ÷2, ÷4, and ÷8 via N0/N1 control pins.
• Additive phase jitter of 60 fs maximum at 156.25 MHz integration range.

Clock Buffers, Drivers Applications

• Clock signal division and distribution in wireless base station radio equipment.
• Telecommunication infrastructure requiring low additive phase jitter.
• Networking end equipment demanding high-frequency clock distribution.

Clock Buffers, Drivers Procurement Notes

Verify component authenticity through authorized Renesas Electronics distributors. Confirm RoHS 6 compliance and lead-free status. Ensure proper handling of the 20-VFQFPN package due to moisture sensitivity. Validate thermal management requirements for the exposed pad during assembly.

Clock Buffers, Drivers Selection Notes

Select this component when differential LVCMOS/LVTTL inputs must be converted to multiple LVPECL outputs. Ensure supply voltage matches either 3.3V or 2.5V domains. Verify that the required division ratio aligns with the N0/N1 pin logic. Consider thermal resistance characteristics for PCB layout design.

Clock Buffers, Drivers Part Context

This part belongs to the 8V79S674 series of clock buffers and dividers. Originally manufactured by Integrated Device Technology (IDT), the product line was acquired by Renesas Electronics. The device serves as a specialized timing solution for high-speed digital systems requiring precise clock distribution.

Clock Buffers, Drivers Replacement Considerations

The 8V79S674NLGI8 is functionally identical but supplied in tape and reel packaging instead of trays. No other cross-model substitutes are documented in the provided datasheet.

Clock Buffers, Drivers FAQ

How is the frequency division ratio configured?

The division ratio is set using the N0 and N1 input pins: 0/0 for ÷1, 0/1 for ÷2, 1/0 for ÷4, and 1/1 for ÷8.

What is the maximum output skew specification?

The maximum output skew between any two outputs under equal load conditions is 50 ps.

Can unused LVPECL outputs be left floating?

Yes, unused LVPECL outputs can be left floating without attached traces, though terminating both sides of the pair is also acceptable.