Diodes Incorporated PI5C32390QE

Overview

PI5C32390QE from Pericom Semiconductor is a 16:8 multiplexer/demultiplexer bus switch with 25-Ω on-resistance, near-zero propagation delay (1.25 ns typ), and ultra-low quiescent current (0.2 μA typ). It enables direct A/B-to-C signal routing in high-speed digital systems, supporting notebook, server backplane, and PCIe Gen1/Gen2 switching applications.

For engineers reviewing the PI5C32390QE datasheet, PI5C32390QE pinout, PI5C32390QE application, or PI5C32390QE equivalent, key selection criteria include on-resistance matching (20–40 Ω), bus enable timing (tPZH/tPLZ ≤ 6.5 ns), low-noise operation for 5 V TTL/CMOS interfaces, and QSOP-28 Pb-free packaging compliance.

Technical Context

The PI5C32390QE implements dual 8-bit bidirectional analog bus switches controlled by active-low AEN and BEN inputs. Each switch connects one of two 8-bit buses (A0–A7 or B0–B7) to a shared 8-bit output bus (C0–C7), enabling crosspoint routing without logic inversion or clocking.

Its 25-Ω on-resistance is optimized to minimize signal reflection in 50-Ω-terminated high-speed traces, while its <0.25 ns RC time constant (RON × CL) ensures negligible added propagation delay beyond system-level driver/load interaction.

Key Specifications

Pinout & Package

Package: 28-pin QSOP (150-mil wide), Pb-free & Green compliant (RoHS-6).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switching applications.

Compared with PI5C3390QE and SN74CBT3244DBR, the PI5C32390QE uniquely integrates 25-Ω on-resistance for impedance-matched high-speed routing-eliminating external components while maintaining <1.3 ns delay and <0.2 μA quiescent current.

Availability

PI5C32390QE is available at Aetrix Electronics and suitable for PCIe Gen1/Gen2 switching, notebook memory expansion, and server backplane interconnect applications requiring stable component supply and RoHS-compliant packaging.

Supply support for PI5C32390QE 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 was a fabless provider of high-speed interface and timing solutions, acquired by Diodes Incorporated in 2016; legacy products maintain full datasheet support and long-term supply commitment.

The PI5C32390QE belongs to Pericom's low-noise bus switch product line, engineered specifically for impedance-controlled, zero-delay signal routing in portable and enterprise computing platforms.

FAQ

What is the maximum operating voltage for PI5C32390QE?

The PI5C32390QE supports a supply voltage range of –0.5 V to +7.0 V on all pins, with recommended operation at VCC = 5.0 V ±5%. Input and output signals may swing from –0.5 V to +7.0 V regardless of VCC, enabling robust interfacing with mixed-voltage systems and tolerant of transient overshoot.

Can PI5C32390QE operate with 3.3 V logic levels?

Yes. The PI5C32390QE functions correctly with 3.3 V logic signals on A, B, and C buses because its switching threshold is determined by VCC-not input voltage-and its VIH/VIL specifications (2.0 V/0.8 V) are fully compatible with 3.3 V CMOS/TTL. VCC must remain at 5 V for proper internal biasing.

How does the 25-Ω on-resistance improve signal integrity?

The 25-Ω on-resistance is designed to match the characteristic impedance of typical 50-Ω PCB traces when used in series configuration (e.g., source → switch → load). This reduces signal reflections at the switch node, minimizing overshoot, undershoot, and ringing-especially critical for clean edge transitions in PCIe and DDR applications up to 200 MHz.

Is PI5C32390QE pin-compatible with PI5C3390QE?

Yes-both devices share identical 28-pin QSOP packaging, pin assignment, and truth table behavior. The only functional difference is on-resistance (25 Ω vs. 5 Ω), which affects signal integrity trade-offs but requires no PCB redesign. Swapping requires validation of reflection tolerance in the target signal path.