Diodes Incorporated PI6C4911504-01LIEX

Overview

PI6C4911504-01LIEX from Diodes Incorporated is a high-performance LVPECL fanout buffer with four differential outputs, dual selectable differential inputs (REF_IN0/REF_IN1), and ultra-low additive phase jitter of 0.05 ps RMS (typ). It operates at supply voltages of 2.5 V or 3.3 V, supports up to 1.5 GHz output frequency, and delivers sub-1 ns propagation delay - ideal for clock distribution in high-speed networking switches and telecom backplanes.

For engineers reviewing the PI6C4911504-01LIEX datasheet, PI6C4911504-01LIEX pinout, PI6C4911504-01LIEX application, or PI6C4911504-01LIEX equivalent, key selection criteria include LVPECL output swing compliance (0.6–1.0 V p-p), input selection logic (IN_SEL), synchronous enable control (SYNC_OE), industrial temperature range (−40°C to +85°C), and TSSOP-20 package compatibility with standard PCB layout practices for high-frequency clock routing.

Technical Context

This device implements a low-skew, single-stage LVPECL fanout architecture with internal termination resistors (50 kΩ pull-up, 75 kΩ pull-down) on control pins. Its dual-differential-input multiplexer selects between REF_IN0 and REF_IN1 based on IN_SEL logic level, while SYNC_OE enables or disables all outputs synchronously without glitching.

The buffer maintains tight inter-output skew (<40 ps) across all four LVPECL output pairs (Q0–Q3) under matched load conditions, and supports both DC-coupled and AC-coupled LVPECL termination schemes - including 150 Ω pull-down + 100 Ω receiver-side termination - ensuring signal integrity in >100 MHz clock trees.

Key Specifications

Pinout & Package

PI6C4911504-01LIEX is housed in a 20-pin, 173-mil wide TSSOP (L) package with exposed pad thermal enhancement. Pin pitch is 0.65 mm; body dimensions are 6.5 mm × 4.4 mm × 1.2 mm. The package is lead-free, halogen-free, and RoHS 3 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT8T49N285A and NB3N502M, PI6C4911504-01LIEX uniquely balances 4-output fanout, dual-input selection, sub-0.05 ps additive jitter, and industrial temperature support - making it optimal for fixed-configuration, high-integrity telecom and networking clock trees where simplicity and jitter performance are prioritized over programmability.

Availability

PI6C4911504-01LIEX is available at Aetrix Electronics and suitable for high-speed networking switches, telecom backplanes, PCIe Gen5 reference clock distribution, and multi-core processor timing requiring stable component supply across extended product lifecycles.

Supply support for PI6C4911504-01LIEX 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

Diodes Incorporated is a global manufacturer of discrete semiconductors, analog ICs, and timing devices, headquartered in Plano, Texas, with design centers across Asia and manufacturing in certified ISO/TS 16949 and ISO 14001 facilities.

The PI6C series targets high-performance clock distribution in datacom and telecom infrastructure, emphasizing ultra-low jitter, robust LVPECL interface compliance, and industrial reliability - directly addressing timing integrity challenges in 100G+ systems.

FAQ

What is the recommended termination for PI6C4911504-01LIEX LVPECL outputs?

The preferred termination is 150 Ω pull-down to VDD − 2 V at each output pair, combined with 100 Ω differential termination at the receiver. This configuration avoids VDD noise coupling, maintains optimal common-mode voltage (~1.3 V), and achieves the specified 0.6–1.0 V p-p swing. External 100 Ω should be omitted if the receiving device integrates equivalent termination.

Can PI6C4911504-01LIEX accept LVDS or HCSL inputs?

No - the device accepts only LVPECL-compatible differential inputs (REF_IN0±, REF_IN1±) with VID ≥ 0.15 V and VCM between 0.5 V and VDD. LVDS or HCSL signals require level translation (e.g., AC-coupled 100 Ω termination + bias network) to meet input common-mode and amplitude specifications before connecting to REF_IN pins.

How does SYNC_OE affect output state transitions?

SYNC_OE enables or disables all four LVPECL output pairs synchronously with the selected input clock edge - preventing runt pulses or glitches during enable/disable. When SYNC_OE is low, Q+ outputs are driven low and Q− outputs high (not Hi-Z), ensuring defined logic states for downstream receivers during clock gating.

Is PI6C4911504-01LIEX qualified for automotive applications?

No - this variant is rated for industrial temperature (−40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers automotive-grade versions (e.g., PI6C4911504-01QIEX) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation; consult Diodes' automotive product line for qualified alternatives.