Diodes Incorporated PI6C48535-11CLIEX

Overview

PI6C48535-11CLIEX from Diodes Incorporated (acquired Pericom) is a 4-output LVPECL fanout buffer with integrated crystal oscillator circuit, supporting up to 266 MHz output frequency, < 0.03 ps typical additive phase jitter, and dual selectable clock inputs (REF_IN or XTAL_IN). It operates from 2.5 V or 3.3 V supply across –40 °C to +85 °C and is used in high-speed networking switch clock distribution.

For engineers reviewing the PI6C48535-11CLIEX datasheet, PI6C48535-11CLIEX pinout, PI6C48535-11CLIEX application, or PI6C48535-11CLIEX equivalent, key selection criteria include LVPECL output swing (0.6–1.0 Vpp), propagation delay (<1.6 ns), input select logic (IN_SEL), synchronous enable (SYNC_OE), and TSSOP-20 thermal resistance (θ_JA = 84 °C/W).

Technical Context

This device integrates a fundamental-mode crystal oscillator (12–50 MHz) with a low-skew LVPECL fanout buffer, enabling single-chip clock generation and distribution. Its dual-input multiplexer (REF_IN/XTAL_IN selected via IN_SEL) and synchronous output enable (SYNC_OE) support flexible clock source switching and glitch-free gating.

The buffer delivers four matched differential LVPECL outputs with ≤30 ps inter-output skew, 48–52% duty cycle, and 300–700 ps rise/fall times under 50 Ω termination. Output disable timing (TOD/TOE = 200 ns) ensures clean state transitions during power management sequences.

Key Specifications

Pinout & Package

TSSOP-20 package (7.0 mm × 4.4 mm, 0.65 mm pitch), lead-free and RoHS-compliant, with exposed pad not electrically connected. Thermal resistance θ_JA = 84 °C/W, θ_JC = 17 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICS853S01I-01LFT and Si53301-A-GM, the PI6C48535-11CLIEX offers optimal balance of integration (on-die oscillator), ultra-low jitter (<0.03 ps), and compact TSSOP-20 packaging-ideal for space-constrained, fixed-frequency clock distribution where hardware simplicity and deterministic timing are prioritized.

Availability

PI6C48535-11CLIEX is available at Aetrix Electronics and suitable for networking switches, telecom backplanes, server memory subsystems, and industrial test equipment requiring stable component supply and guaranteed long-term availability.

Supply support for PI6C48535-11CLIEX 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 acquired Pericom Semiconductor in 2017 and now manufactures high-performance timing, interface, and signal integrity solutions for communications and computing markets.

The PI6C48535-11CLIEX belongs to Pericom's legacy clock buffer product line, designed specifically for low-jitter, multi-output clock distribution in high-speed digital systems where deterministic timing and board-level integration are critical.

FAQ

What crystal specifications are required for the PI6C48535-11CLIEX internal oscillator?

The device requires a fundamental-mode quartz crystal with 12–50 MHz frequency, ≤50 Ω ESR, 7 pF shunt capacitance, and ≤1 mW drive level. Crystals must be rated for industrial temperature (–40 °C to +85 °C) and mounted close to XTAL_IN/XTAL_OUT pins with symmetric trace routing to minimize parasitic imbalance.

Can PI6C48535-11CLIEX operate with only REF_IN and disable the internal oscillator?

Yes. Setting IN_SEL = 0 selects REF_IN as the clock source and disables the internal oscillator circuit. XTAL_IN and XTAL_OUT become high-impedance; no crystal is needed. The buffer passes REF_IN directly to all four LVPECL outputs with <1.6 ns propagation delay and <0.03 ps additive jitter.

How does SYNC_OE affect output states during enable/disable transitions?

When SYNC_OE transitions low, all Q+ outputs are driven low and all Q− outputs are driven high-producing defined logic states rather than floating outputs. When SYNC_OE transitions high, outputs resume normal LVPECL operation synchronized to the next rising edge of the selected input clock, preventing glitches.

Is PI6C48535-11CLIEX pin-compatible with earlier Pericom fanout buffers like PI6C48535-11C?

Yes. PI6C48535-11CLIEX is a tape-and-reel variant of the same silicon die as PI6C48535-11C, sharing identical pinout, electrical characteristics, and thermal behavior. The "X" suffix denotes packaging only; no functional or parametric differences exist between the two orderables.