Diodes Incorporated PI5C3390QEX

Overview

PI5C3390QEX from Pericom Semiconductor is a 16:8 multiplexer/demultiplexer bus switch with 5 Ω on-resistance, near-zero propagation delay (0.25 ns typical), and ultra-low quiescent current (0.2 μA typical), designed for direct bus connection in high-speed notebook and embedded data-path routing applications.

For engineers reviewing the PI5C3390QEX datasheet, PI5C3390QEX pinout, PI5C3390QEX application, or PI5C3390QEX equivalent, key selection criteria include on-resistance matching, enable timing (tPZH/tPLZ ≤ 6.5 ns), bus isolation capability, and QSOP-28 footprint compatibility in space-constrained PCB layouts.

Technical Context

This device implements dual 8-bit bidirectional analog/digital bus switches controlled by active-low AEN and BEN inputs, enabling independent routing of Bus A or Bus B to common Bus C. It operates at 5 V ±5% with TTL-compatible control logic and supports hot-swap-capable signal pass-through without added ground bounce or logic-level translation.

The switch architecture uses low-threshold MOSFETs to achieve 5 Ω R_ON (V_CC = min, I_ON = 48 mA), 6 pF input capacitance, and 16 pF on-state capacitance - critical for preserving signal integrity in 100+ MHz digital buses while maintaining sub-nanosecond timing margins.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with PI5C32390QEX and SN74CBT3384CDW, the PI5C3390QEX delivers lowest on-resistance (5 Ω) and lowest quiescent current (0.2 μA), making it optimal for ultra-low-power, high-fidelity 5 V bus routing where minimal signal degradation is mandatory.

Availability

PI5C3390QEX is available at Aetrix Electronics and suitable for notebook platform design, industrial PLC I/O expansion, embedded display interface routing, and PCIe lane multiplexing requiring stable component supply and long-term lifecycle assurance.

Supply support for PI5C3390QEX 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; its bus switch portfolio remains widely deployed in legacy and new industrial designs.

The PI5C3390 belongs to Pericom's low-R_ON analog bus switch product line, engineered specifically for zero-delay, low-noise signal routing in portable computing and embedded control systems.

FAQ

What is the maximum operating frequency supported by PI5C3390QEX?

The PI5C3390QEX does not specify a maximum clock frequency because it is an analog bus switch-not a synchronous logic device. Its usable bandwidth is determined by RC time constant: with 5 Ω R_ON and 50 pF load, the -3 dB point exceeds 600 MHz. System-level performance depends on driver strength and trace impedance, not internal clocking.

Can PI5C3390QEX operate with 3.3 V logic levels?

No-PI5C3390QEX requires a 4.75–5.25 V supply and is specified only for 5 V TTL/CMOS logic families. Its control inputs (AEN/BEN) have VIH = 2.0 V minimum, but output swing and R_ON are optimized for 5 V operation; use at 3.3 V results in degraded on-resistance and timing margins.

Is PI5C3390QEX pin-compatible with PI5C32390QEX?

Yes-both devices share identical 28-pin QSOP-150 package, pin assignment, and functional block diagram. The only difference is internal on-resistance (5 Ω vs. 25 Ω) and absence/presence of integrated termination resistors; they are drop-in replacements where signal integrity requirements permit the higher R_ON.

Does PI5C3390QEX require external pull-up or pull-down resistors on AEN/BEN?

No-AEN and BEN are standard CMOS inputs with ±1 μA leakage current and guaranteed logic thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). External biasing is unnecessary unless system-level noise immunity requires stronger static control; typical designs drive them directly from FPGA or microcontroller GPIOs.