Diodes Incorporated PI5C3253Q

Overview

PI5C3253Q from Pericom Semiconductor is a dual 4:1 multiplexer/demultiplexer bus switch with three-state outputs, pin-compatible with 74F253 and 74ALS/AS/LS253 logic devices. It features 5Ω on-resistance, near-zero propagation delay (0.25ns), ultra-low quiescent current (0.2μA typical), and operates at 5V ±5% over –40°C to +85°C ambient. Used in notebook bus routing for high-speed data path selection without signal degradation.

For engineers reviewing the PI5C3253Q datasheet, PI5C3253Q pinout, PI5C3253Q application, or PI5C3253Q equivalent, key selection criteria include on-resistance matching, enable-select timing (tPZH/tPLZ ≤6.0ns), ESD tolerance (2kV HBM), and QSOP-16 footprint compatibility with legacy 74-series logic layouts.

Technical Context

The PI5C3253Q implements two independent 4:1 analog bus switches controlled by shared S0/S1 select lines and separate EA/EB enables. Each channel connects one of four bidirectional inputs (IA0–IA3 or IB0–IB3) to its output (YA or YB) when enabled, with true three-state isolation when disabled.

Its CMOS-based bus switch architecture eliminates propagation delay beyond RC time constant (≤0.25ns for 50pF load), avoids ground bounce via direct I–Y conduction, and supports rail-to-rail input/output swing (–0.5V to +7.0V) while maintaining TTL-compatible control thresholds (VIH = 2.0V, VIL = 0.8V).

Key Specifications

Pinout & Package

PI5C3253Q is housed in a 16-pin 150-mil wide QSOP (Package Code Q), JEDEC MO-137B compliant, with 0.65mm lead pitch and 3.99mm body width. Pin 1 is EA (Enable A), pin 16 is VCC; GND is pin 12.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3253PWR and 74LVC253PW, PI5C3253Q delivers superior signal fidelity (5Ω RON, 0.25ns delay) and broader voltage/ESD capability, making it optimal for mixed-voltage, high-speed, and portable applications where analog transparency and robustness are critical.

Availability

PI5C3253Q is available at Aetrix Electronics and suitable for notebook memory routing, industrial PLC I/O expansion, and automated test equipment signal switching requiring stable component supply and long-term lifecycle support.

Supply support for PI5C3253Q 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, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2016; legacy products maintain full datasheet compliance and industrial qualification.

The PI5Cxx bus switch family targets low-latency, low-power analog signal routing in portable computing and industrial control, emphasizing pin compatibility with legacy logic and robustness under real-world ESD and voltage transient conditions.

FAQ

Is PI5C3253Q compatible with 3.3V control signals?

Yes. Its input thresholds (VIH = 2.0V, VIL = 0.8V) ensure reliable recognition of 3.3V logic HIGH/LOW levels. The device operates from a 5V supply but accepts 3.3V-compatible control inputs without level shifters, simplifying integration with mixed-voltage SoCs.

Can PI5C3253Q be used in bidirectional data paths?

Yes. It functions as a true bidirectional analog switch: signals pass equally well from IA0→YA or YA→IA0 with identical 5Ω on-resistance and capacitance. No direction pin or external biasing is needed, enabling flexible use in USB, I²C, or memory bus contexts.

What is the maximum capacitive load supported without signal degradation?

At CL = 50pF, propagation delay remains ≤0.25ns. For loads up to 100pF, rise/fall times increase predictably per RC model (RON × CL), but signal integrity holds within 5% amplitude loss for 100MHz square waves - verified in Pericom's application note AN-3253.

Does PI5C3253Q require external pull-up or pull-down resistors on control pins?

No. Internal weak pull-downs on EA/EB and S0/S1 are not present; however, the device draws only 0.2μA quiescent current, so floating control inputs cause undefined switching. External 10kΩ pull-downs on EA/EB are recommended for default-disabled operation in unpowered states.