Diodes Incorporated PI5C3253LEX

Overview

PI5C3253LEX from Pericom Semiconductor is a dual 4:1 multiplexer/demultiplexer bus switch with three-state outputs, designed for high-speed data routing in notebook and embedded systems. It features 5Ω on-resistance, near-zero propagation delay (0.25 ns), ultra-low quiescent current (0.2 μA typical), and operates at 5V ±5%. It serves as a low-noise, direct-bus connection switch in memory and peripheral I/O paths.

For engineers reviewing the PI5C3253LEX datasheet, PI5C3253LEX pinout, PI5C3253LEX application, or PI5C3253LEX equivalent, key selection criteria include on-resistance matching, enable/selection timing (tPZH/tPLZ ≤ 6.0 ns), 5V logic compatibility, ESD robustness (2 kV HBM), and QSOP-16 footprint suitability for space-constrained PCB layouts.

Technical Context

The PI5C3253LEX implements two independent 4:1 analog bus switches, each controlled by separate enable (EA/EB) and dual-bit select (S0/S1) inputs. Each channel connects one of four bidirectional data inputs (IA0–IA3 or IB0–IB3) to its output (YA or YB) when enabled, with high-impedance isolation otherwise.

Its CMOS-based bus-switch architecture eliminates propagation delay beyond RC time constant (≤0.25 ns with 50 pF load), avoids ground bounce, and supports rail-to-rail signal pass-through without level shifting - enabling transparent, low-distortion data routing between 5V TTL/CMOS buses.

Key Specifications

Pinout & Package

PI5C3253LEX is packaged in a 16-pin 173-mil wide Pb-free & Green TSSOP (Package Code L), compliant with JEDEC MO-153F/AB. Pin pitch is 0.65 mm; body width is 4.4–4.5 mm; total length is 9.8–10.0 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3253CPWR and 74LVC253PW,118, the PI5C3253LEX delivers superior low-power performance (0.2 μA vs. ≥5 μA), lower on-resistance (5 Ω vs. 7 Ω), and true zero-delay analog switching - making it optimal for 5V notebook I/O and memory expansion where timing integrity and battery life are co-prioritized.

Availability

PI5C3253LEX is available at Aetrix Electronics and suitable for notebook I/O multiplexing, memory expansion interfaces, industrial backplane routing, and PCIe sideband signal management requiring stable component supply and long-term lifecycle assurance.

Supply support for PI5C3253LEX 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-performance interface, timing, and signal-integrity solutions, acquired by Diodes Incorporated in 2016; its legacy portfolio remains widely deployed in computing and communications infrastructure.

The PI5C3253LEX belongs to Pericom's high-speed bus switch product line, engineered specifically for low-latency, low-power, 5V-tolerant signal routing in portable and embedded systems with strict thermal and space constraints.

FAQ

Is PI5C3253LEX compatible with 3.3V logic control signals?

Yes - the PI5C3253LEX accepts 3.3V logic levels on EA, EB, S0, and S1 inputs while operating from a 5V VCC supply. Its VIH is guaranteed at 2.0V minimum, ensuring reliable recognition of 3.3V HIGH signals without level shifters.

Can PI5C3253LEX be used in bidirectional data paths without direction control pins?

Yes - it is inherently bidirectional: IA0–IA3 and IB0–IB3 connect directly to YA and YB through low-RON MOSFET switches, with no internal direction logic or asymmetry. Signal flow direction is determined solely by external source/sink configuration.

What is the maximum capacitive load the PI5C3253LEX can drive reliably?

It is characterized up to 50 pF load capacitance (tIY test condition), but practical use supports ≥100 pF with acceptable rise/fall time degradation. For loads >100 pF, verify signal integrity via board-level simulation due to RC time constant dependence on RON and CL.

Does PI5C3253LEX require external pull-up or pull-down resistors on control pins?

No - internal weak pull-downs are not present, but external termination is unnecessary for normal operation. Control pins (EA, EB, S0, S1) must be actively driven to defined logic states; floating inputs may cause undefined channel behavior or increased ICC.