Diodes Incorporated PI6C4911506LIEX

Overview

PI6C4911506LIEX from Pericom is a 6-output LVPECL fanout buffer IC with single differential input, supporting up to 1.5 GHz output frequency, ultra-low additive phase jitter (< 0.03 ps typ. at 156.25 MHz, 12 kHz–20 MHz), < 800 ps typical propagation delay, and dual supply operation (2.5 V / 3.3 V) in TSSOP-20 package. It distributes low-jitter clock signals across high-speed networking switch backplanes.

For engineers reviewing the PI6C4911506LIEX datasheet, PI6C4911506LIEX pinout, PI6C4911506LIEX application, or PI6C4911506LIEX equivalent, key selection criteria include differential LVPECL input compatibility, output skew ≤50 ps, industrial temperature range (−40°C to +85°C), and TSSOP-20 thermal performance (θ_JA = 84.0°C/W).

Technical Context

The PI6C4911506LIEX implements a fully differential LVPECL fanout architecture with internal bias generation via VBB output, enabling direct AC-coupled LVPECL, LVDS, or CML input interfacing. Its input stage supports pulldown (REF_IN+) and pull-up/pulldown (REF_IN−) termination for impedance matching without external resistors.

All six differential outputs are independently buffered with matched propagation paths, delivering sub-50 ps output skew and < 230 ps part-to-part skew. The device operates with no external feedback or configuration pins-functionality is fixed at power-on, requiring only proper decoupling (0.1 µF per VDD pin) and differential trace routing.

Key Specifications

Pinout & Package

TSSOP-20 package with exposed pad not present; 0.65 mm lead pitch; body dimensions 6.5 mm × 4.4 mm × 1.2 mm; RoHS-compliant, Pb-free, green molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVPECL fanout buffer applications.

Compared with IDT8T49N242A and NB3N551, the PI6C4911506LIEX delivers the lowest additive jitter and native dual-supply operation, making it optimal for fixed-frequency, jitter-critical telecom and high-speed serial applications where configuration overhead and thermal headroom are constraints.

Availability

PI6C4911506LIEX is available at Aetrix Electronics and suitable for 10G/25G Ethernet switch fabric, PCIe Gen4/Gen5 reference clock distribution, and synchronous optical networking requiring stable component supply and long-term industrial-grade availability.

Supply support for PI6C4911506LIEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Pericom Semiconductor (acquired by Diodes Incorporated in 2016) specialized in high-performance timing, interface, and signal-integrity solutions for networking, computing, and telecom infrastructure.

The PI6C4911506LIEX belongs to Pericom's high-frequency clock buffer product line, engineered specifically for low-jitter, multi-destination clock distribution in backplane-based systems operating above 1 GHz.

FAQ

What is the recommended termination for PI6C4911506LIEX LVPECL outputs?

The preferred termination is 150 Ω pull-down to VEE (ground) at the driver side plus 100 Ω differential termination at the receiver. This configuration avoids VDD noise coupling and matches the 50 Ω per-leg characteristic impedance of standard PCB traces. External 100 Ω termination should be omitted if the receiving ASIC integrates equivalent on-die termination.

Can PI6C4911506LIEX accept LVDS or CML inputs?

Yes - when AC-coupled, the device uses its internal VBB output (1.76–1.98 V) to bias the REF_IN+ and REF_IN− pins, enabling direct interface to LVDS or CML sources without external bias networks. DC-coupled LVDS is not supported due to incompatible common-mode voltage ranges.

Does PI6C4911506LIEX require external configuration or programming?

No - the PI6C4911506LIEX is a fixed-function fanout buffer with no registers, I²C interface, or configuration pins. It powers up ready to operate once VDD and VEE are applied and the differential input signal meets LVPECL thresholds (VIH ≥ 2.0 V at 3.3 V supply).

How does thermal performance vary between 2.5 V and 3.3 V supply operation?

At 3.3 V, IDD is 72–95 mA (typ./max); at 2.5 V, IEE is 71–95 mA. Power dissipation differs by <5%, so junction temperature rise remains within ±2°C under identical PCB layout and airflow. The 84.0°C/W θ_JA rating applies to both voltages per JEDEC testing conditions.