Diodes Incorporated PI3C34X245BEX

Overview

PI3C34X245BEX from Pericom Semiconductor is a 2.5V/3.3V, 32-bit, 2-port bus switch with 5 Ω on-resistance, <0.25 ns propagation delay, 400+ MHz bandwidth, and 5V I/O tolerance-used in high-speed memory and processor interconnects for hot-insertion-capable backplanes.

For engineers reviewing the PI3C34X245BEX datasheet, PI3C34X245BEX pinout, PI3C34X245BEX application, or PI3C34X245BEX equivalent, key selection criteria include bus enable timing (1.5–9.8 ns), hot-swap capability, 5V-tolerant I/O, low ground bounce, and BQSOP-80 mechanical compatibility.

Technical Context

The PI3C34X245BEX implements four independent 8-bit bus enable groups (BE1–BE4), each controlling eight A-to-B bidirectional switch paths. Each switch operates as a low-impedance FET pass gate with no active logic or level translation.

It requires no external biasing or termination; signal integrity is preserved via near-zero RC delay (RON ≈ 5 Ω, CON ≈ 10 pF) and absence of internal latching or clocking circuitry-making it suitable for transparent, protocol-agnostic data path switching.

Key Specifications

Pinout & Package

PI3C34X245BEX uses an 80-pin BQSOP (150-mil wide) package with exposed thermal pad, lead-free (Pb-free & Green) construction per JEDEC MO-154C/BC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3245APM and NB3N3020DR2G, PI3C34X245BEX uniquely supports dual-supply operation, quadrant-level enable granularity, and verified hot-insertion behavior-critical for modular computing and field-upgradeable systems.

Availability

PI3C34X245BEX is available at Aetrix Electronics and suitable for server backplane interconnects, PCI-X expansion slot switching, and DDR memory channel multiplexing requiring stable component supply and long-term industrial availability.

Supply support for PI3C34X245BEX 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 (acquired by Diodes Incorporated in 2016) specialized in high-speed interface ICs, clock management, and signal-integrity solutions for computing and communications infrastructure.

The PI3C34X245 belongs to Pericom's bus switch product line, engineered specifically for hot-pluggable, high-bandwidth parallel bus architectures in enterprise and telecom equipment.

FAQ

What is the maximum operating frequency supported by PI3C34X245BEX?

The device supports signal bandwidth exceeding 400 MHz, validated by characterization of insertion loss and eye diagram integrity under 50 Ω terminated conditions. This enables reliable use in DDR2/3, PCI-X, and parallel ATA interfaces where edge rates correspond to >200 MHz fundamental frequencies.

Can PI3C34X245BEX be used with 2.5 V and 3.3 V supplies simultaneously?

No-VCC must be a single supply rail at either 2.5 V ±10% or 3.3 V ±10%. The device does not support mixed-supply operation across pins; all VCC pins must be tied to the same voltage source to ensure proper switch threshold and clamp diode biasing.

How does the BE1–BE4 enable logic function?

Each BE pin (BE1–BE4) is active-low and independently controls eight corresponding A/B bit pairs (e.g., BE1 enables A0–A7 ↔ B0–B7). All four enables must be asserted LOW for full 32-bit connectivity; partial assertion enables only selected 8-bit lanes, allowing segmented bus isolation.

Is PI3C34X245BEX pin-compatible with earlier Pericom bus switches like PI3C32X245?

No-PI3C34X245BEX uses an 80-pin BQSOP package with quadrant-distributed power/ground and four BE inputs, whereas PI3C32X245 uses a 56-pin TSSOP with two BE inputs and different pin mapping. Mechanical and logical pinouts are incompatible; PCB redesign is required for substitution.