9DB104BFLF

Application Specific Clock/Timing Overview

The Renesas Electronics 9DB104BFLF is a four-output differential clock buffer designed for PCI-Express applications. It operates within a supply voltage range of 3.135 V to 3.465 V and supports maximum input frequencies up to 220 MHz. The device provides four 0.7V current-mode differential output pairs with cycle-cycle jitter under 50 ps and output skew under 50 ps. It features an integrated PLL supporting zero-delay buffer mode, SMBus configuration capabilities, and spread spectrum modulation tolerance. The component is housed in a 28-pin SSOP package.

Application Specific Clock/Timing Feature Summary

• Four 0.7V current-mode differential output pairs
• Supports zero-delay buffer (ZDB) and fan-out modes via BYPASS#/PLL pin
• Cycle-cycle jitter less than 50 ps; output skew less than 50 ps
• SMBus serial interface for frequency selection and output control

Application Specific Clock/Timing Applications

• PCI-Express clock distribution
• Next-generation I/O devices requiring tight ppm accuracy clocks
• Serial-ATA systems tolerant to spread spectrum modulation

Application Specific Clock/Timing Procurement Notes

The 9DB104BFLF is marked as not recommended for new designs and has reached end-of-life status. Verification of availability requires checking specific distributor channels for remaining stock or obsolete inventory. Designers should consider the EOL status when planning long-term production runs.

Application Specific Clock/Timing Selection Notes

Select this component only if legacy compatibility with Intel DB400 specifications is required. Ensure the design accommodates the 28-pin SSOP footprint and the external 475 ohm reference resistor on the IREF pin. Verify that the 3.3V nominal supply voltage aligns with the system power rails.

Application Specific Clock/Timing Part Context

Originally manufactured by Integrated Circuit Systems, Inc. (ICS), this part was acquired by Renesas Electronics. It belongs to the 9DB series of differential buffers. The 'LF' suffix indicates lead-free and RoHS compliance. The device follows the Intel DB400 specification for differential buffering.

Application Specific Clock/Timing Replacement Considerations

Public confirmed substitute: 9ZXL0451EKILFT (Renesas Electronics Corporation).

Application Specific Clock/Timing FAQ

How is the output current established?

The output current is established by the IREF pin, which requires a fixed precision resistor tied to ground. A standard value of 475 ohms is typically used.

What is the function of the BYPASS#/PLL pin?

This pin selects the operating mode. A logic low selects Bypass (fan-out) mode, while a logic high selects PLL (zero-delay buffer) mode.

Does the device support spread spectrum modulation?

Yes, it is tolerant to triangular modulation down spread of 0 to -0.5% and center spread of +/- 0.25%.