Diodes Incorporated PI3C3305LEX

Overview

PI3C3305LEX from Diodes Incorporated is a 2.5V/3.3V, 2-bit, dual-channel bus switch with individual active-HIGH enables, designed for high-bandwidth signal routing in digital interfaces. It features 5Ω on-resistance, <0.25ns propagation delay, 400MHz bandwidth, and 5V-tolerant I/Os-enabling clean signal pass-through in PCIe, USB, and memory interconnect applications.

For engineers reviewing the PI3C3305LEX datasheet, PI3C3305LEX pinout, PI3C3305LEX application, or PI3C3305LEX equivalent, key selection criteria include enable polarity (active-HIGH), rail-to-rail switching capability, hot-insertion support, and TSSOP-8 package compatibility with high-speed layout constraints.

Technical Context

The PI3C3305LEX implements two independent bilateral analog switches controlled by separate BE1/BE2 inputs, each connecting A1↔B1 and A2↔B2 with no added logic delay. Its CMOS transmission-gate architecture ensures rail-to-rail signal swing and supports 2.5V or 3.3V VCC operation while tolerating up to 5.5V on I/O pins.

Switching behavior is defined by truth table states: when BE = HIGH, A–B path is low-impedance (RON = 5Ω typ); when BE = LOW, path enters high-impedance state (IOZH ≤ ±1µA). Enable timing parameters (tPZH/tPLZ ≤ 6.5ns at 3.3V) ensure precise control in multi-lane parallel buses.

Key Specifications

Pinout & Package

PI3C3305LEX is housed in an 8-pin, 173-mil wide plastic TSSOP (JEDEC MO-153) package with standard lead pitch of 0.65mm and thermal pad omitted. Pin numbering follows standard TSSOP convention (pin 1 marked, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PI3C3306LEX, PI3C3305LEX eliminates need for external inverters in active-HIGH control systems; versus SN74CBT3244PWR, it trades channel density for finer-grained, lower-latency lane management in high-speed serial interconnects.

Availability

PI3C3305LEX is available at Aetrix Electronics and suitable for PCIe lane switching, USB 2.0 docking, and DDR memory multiplexing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI3C3305LEX 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance analog, logic, and power management solutions for industrial, computing, and communications markets.

The PI3C3305LEX belongs to Diodes' Pericom® high-speed interface product line, engineered specifically for low-latency, high-fidelity signal routing in next-generation digital interconnects including PCIe, USB, and memory subsystems.

FAQ

What is the maximum operating frequency supported by PI3C3305LEX?

The PI3C3305LEX supports signal bandwidth exceeding 400MHz, verified by –3dB small-signal frequency response and maintained signal integrity up to 2.5Gbps in PCIe Gen1 applications. This performance is enabled by its 5Ω on-resistance and 5pF off-capacitance, minimizing RC time constants in high-speed layouts.

Can PI3C3305LEX operate with mixed 2.5V and 3.3V supplies on different channels?

No-PI3C3305LEX uses a single VCC pin shared across both channels, so it must be powered from one supply voltage (either 2.5V or 3.3V). However, its 5V-tolerant I/Os allow connection to signals at either voltage level regardless of VCC, enabling level-shifting functionality without external components.

Is PI3C3305LEX pin-compatible with PI3C3306LEX?

Yes-PI3C3305LEX and PI3C3306LEX share identical pinout, package, and electrical specifications except for enable polarity: PI3C3305LEX uses active-HIGH BE inputs, while PI3C3306LEX uses active-LOW. No PCB redesign is needed when substituting, but control logic must be inverted to maintain functional equivalence.

Does PI3C3305LEX require external pull-up or pull-down resistors on enable pins?

A pull-up resistor is recommended on each BE pin for power-up protection, as stated in the datasheet Note 2. This ensures the switch remains disabled (high-impedance) during power ramp-up, preventing unintended signal coupling or bus contention before system initialization completes.