Diodes Incorporated PI5C3253QEX

Overview

PI5C3253QEX from Pericom Semiconductor is a dual 4:1 analog multiplexer/demultiplexer bus switch with three-state outputs, designed for high-speed data routing in 5V logic systems. It features 5Ω on-resistance, near-zero propagation delay (0.25ns), ultra-low quiescent current (0.2μA typical), and pin compatibility with 74F253/74ALS253 logic devices. Used in notebook I/O expansion and memory address selection.

For engineers reviewing the PI5C3253QEX datasheet, PI5C3253QEX pinout, PI5C3253QEX application, or PI5C3253QEX equivalent, key selection criteria include on-resistance matching, enable timing (tPZH/tPLZ ≤ 6.0ns), supply voltage range (–0.5V to +7.0V), and QSOP-16 thermal performance under –40°C to +85°C ambient conditions.

Technical Context

The PI5C3253QEX implements two independent 4:1 bidirectional analog switches controlled by shared S1/S0 select lines and separate EA/EB enables. Each switch path provides direct metal-to-metal conduction when enabled, with no internal logic buffering or level translation.

Its architecture eliminates ground bounce and propagation delay beyond RC time constant (RON × CL), supporting clean signal pass-through for TTL/CMOS-compatible buses. ESD protection up to 2kV HBM ensures robustness in portable system interconnects.

Key Specifications

Pinout & Package

PI5C3253QEX is packaged in a 16-pin QSOP (150-mil wide, package code Q), RoHS-compliant and halogen-free per Pericom's green initiative.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4:1 analog switch applications.

Compared with SN74CBT3253CPWR and 74LVC253PW, PI5C3253QEX delivers superior analog signal fidelity, 5V tolerance, and true bidirectional transparency-making it uniquely suited for high-speed data bus switching where RON, delay, and voltage range are design-critical.

Availability

PI5C3253QEX is available at Aetrix Electronics and suitable for notebook I/O expansion, industrial PLC backplanes, memory subsystems, and display interface routing requiring stable component supply across long-lifecycle programs.

Supply support for PI5C3253QEX 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 and timing solutions for computing, communications, and consumer electronics before its 2016 acquisition.

The PI5C3253 belongs to Pericom's CBT (Crossbar Bus Technology) family, engineered specifically for zero-delay, low-RON analog switching in 5V logic environments with stringent ESD and power requirements.

FAQ

Is PI5C3253QEX compatible with 3.3V logic control signals?

Yes. The device accepts 3.3V-tolerant control inputs (S0, S1, EA, EB) when VCC = 5V, as VIH is specified at 2.0V minimum and VIL at 0.8V maximum. This allows direct interfacing with 3.3V microcontrollers without level shifters, provided all I/O signals remain within the 5V absolute maximum rating.

Can PI5C3253QEX be used in bidirectional USB 1.1 signal routing?

No. While bidirectional, PI5C3253QEX lacks the 90Ω differential impedance control, ESD rating beyond 2kV HBM, and signal integrity validation required for USB 1.1 full-speed (12Mbps) data lines. Its 5Ω RON and 6pF capacitance are optimized for parallel buses-not differential signaling protocols.

What is the thermal resistance (θJA) of the QSOP-16 package?

Pericom's published θJA for the QSOP-16 (Q) package is 110°C/W under JEDEC JESD51-2 standard conditions (single-layer copper, 1-inch² pad). This value assumes no internal thermal vias; actual board-level performance improves with 2oz copper and thermal relief patterns under the exposed pad area.

Does PI5C3253QEX require external pull-up or pull-down resistors on control pins?

No. Internal weak pull-downs (≈100kΩ) are present on EA, EB, S0, and S1 pins, ensuring defined logic states during power-up or floating conditions. External resistors are unnecessary unless specific timing or noise immunity requirements demand stronger biasing in high-noise industrial environments.