Diodes Incorporated PI5C3384QEX

Overview

PI5C3384QEX from Pericom Semiconductor is a 10-bit, 2-port CMOS bus switch with dual active-low bus enable inputs (BEA, BEB), 5 Ω typical on-resistance, near-zero propagation delay (0.25 ns), and ultra-low quiescent current (0.2 μA typical), used to isolate or connect parallel data buses in notebook and portable computing systems.

For engineers reviewing the PI5C3384QEX datasheet, PI5C3384QEX pinout, PI5C3384QEX application, or PI5C3384QEX equivalent, key selection criteria include bidirectional switching capability, 5Ω R_ON, 0.25 ns propagation delay, 6 pF input capacitance, and TSSOP-24/QSOP-24 package compatibility for space-constrained PCB layouts.

Technical Context

The PI5C3384QEX implements two independent 5-bit switch banks (A0–A4/B0–B4 and A5–A9/B5–B9), each controlled by separate active-low enable signals (BEA and BEB). It operates at 5 V ±5% with TTL-compatible logic thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and supports bidirectional signal flow without direction pins or internal latching.

Its low on-resistance (5 Ω typ.) and minimal parasitic capacitance (6 pF input, 8 pF on-state) ensure signal integrity across high-speed parallel buses up to 100 MHz, while the absence of propagation delay beyond RC time constant enables transparent interconnection between source and load domains.

Key Specifications

Pinout & Package

PI5C3384QEX is housed in a 24-pin QSOP (150-mil wide) package with 0.635 mm lead pitch, 7.9 mm × 4.5 mm body size, and Pb-free/Green compliance. Pin 1 is marked via notch or dot; leads are gull-wing, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit bidirectional bus switch applications.

Compared with SN74CBT3384CPWR and PI5C3384LE, the PI5C3384QEX delivers the lowest on-resistance (5 Ω) in a compact QSOP package, making it optimal for high-fidelity, high-speed bus coupling where minimal signal degradation is mandatory.

Availability

PI5C3384QEX is available at Aetrix Electronics and suitable for notebook memory expansion, industrial backplane interconnect, embedded test access multiplexing, and digital audio routing requiring stable component supply and long-term lifecycle support.

Supply support for PI5C3384QEX 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 (now part of Diodes Incorporated) specialized in high-speed interface, timing, and signal-integrity solutions for computing, communications, and consumer electronics before its 2016 acquisition.

The PI5C3384 product line was engineered for low-latency, low-power bus isolation in portable and embedded systems, emphasizing bidirectional transparency, minimal R_ON, and ultra-low standby current.

FAQ

What is the maximum operating frequency supported by PI5C3384QEX?

The PI5C3384QEX has no specified clock frequency limit because it is a passive analog switch-not a clocked device. Its usable bandwidth is determined by RC time constant: with 5 Ω R_ON and 50 pF load, the −3 dB point exceeds 300 MHz. Real-world performance in parallel buses is typically limited by PCB trace impedance and driver strength, not the switch itself.

Can PI5C3384QEX be used with 3.3 V logic systems?

Yes-PI5C3384QEX accepts 3.3 V logic levels on BEA/BEB control inputs (V_IH = 2.0 V min, V_IL = 0.8 V max) and passes 3.3 V signals bidirectionally on A/B ports. However, V_CC must remain at 5 V to maintain 5 Ω R_ON; operating at 3.3 V increases R_ON to ~10 Ω and degrades timing performance.

Is PI5C3384QEX pin-compatible with PI5C3384LE?

No-PI5C3384QEX uses a 24-pin QSOP (150-mil width, 0.635 mm pitch), while PI5C3384LE uses a 24-pin TSSOP (173-mil width, 0.65 mm pitch). Though both have identical pin functions and numbering, their footprints, solder pad layouts, and mechanical dimensions are incompatible without PCB redesign.

Does PI5C3384QEX require external pull-up or pull-down resistors on BEA/BEB?

No-BEA and BEB have no internal pull resistors, but they exhibit <1 μA leakage (I_IL/I_IH), so external biasing is only needed if the driving source floats during power-up or reset. In most microcontroller-driven applications, GPIO outputs actively drive these pins, making external resistors unnecessary.