Diodes Incorporated PI5C34X245BE

Overview

PI5C34X245BE from Pericom Semiconductor is a 32-bit, 2-port bidirectional bus switch with four independent active-low enable inputs (BE1–BE4), 5 Ω typical on-resistance, near-zero propagation delay (0.25 ns), and ultra-low quiescent current (0.2 μA typical). It provides direct analog signal pass-through between two 32-bit buses (A0–A31 and B0–B31) in notebook and industrial backplane interconnect applications.

For engineers reviewing the PI5C34X245BE datasheet, PI5C34X245BE pinout, PI5C34X245BE application, or PI5C34X245BE equivalent, key selection criteria include its 5 Ω R_ON, 0.25 ns t_PLH/t_PHL, –40°C to +85°C operation, 80-pin BQSOP package, and BE-controlled channel isolation without added ground bounce.

Technical Context

The PI5C34X245BE implements four independent 32-bit switch banks, each controlled by one BE input. Each bank connects corresponding A/B bit pairs (e.g., A0↔B0) via low-R_ON MOSFET switches with no internal logic or level translation - preserving signal integrity and voltage domain transparency.

Its switching behavior is purely resistive: when enabled, it presents a 5–7 Ω path (V_CC = 4.5 V, I_ON = 48 mA); when disabled, it isolates with 6 pF off-capacitance and high-impedance (Hi-Z) states on both ports. No internal biasing or termination is required.

Key Specifications

Pinout & Package

Package: 80-pin BQSOP (150-mil wide), Pb-free & Green compliant, body width 6.0 mm, lead pitch 0.50 mm, JEDEC MO-154C/BC compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit bidirectional bus switch applications.

Compared with SN74CBT3245APM and PI5C3257BE, the PI5C34X245BE uniquely delivers native 32-bit width, four independent enables, and BQSOP packaging - reducing component count, interconnect inductance, and layout complexity in high-density bus architectures.

Availability

PI5C34X245BE is available at Aetrix Electronics and suitable for notebook memory expansion, industrial backplane interconnect, embedded power domain bridging, and automated test equipment requiring stable component supply and long-term lifecycle support.

Supply support for PI5C34X245BE 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, timing, and signal-integrity solutions for computing, communications, and industrial markets.

The PI5C34X245BE belongs to Pericom's low-R_ON bus switch product line, engineered specifically for zero-delay, low-noise parallel bus isolation in space-constrained, thermally demanding embedded platforms.

FAQ

What is the maximum allowable signal voltage swing on A/B pins?

The PI5C34X245BE supports rail-to-rail analog signal pass-through: A and B pins tolerate –0.5 V to V_CC + 0.5 V per Absolute Maximum Ratings. With V_CC = 5.5 V, this allows up to 6.0 V peak-to-peak swing, making it compatible with 3.3 V, 5 V, and mixed-voltage interfaces without clamping or distortion.

Can BE1–BE4 be driven by 3.3 V logic while V_CC = 5 V?

Yes. The BE inputs have TTL-compatible thresholds: V_IL ≤ 0.8 V and V_IH ≥ 2.0 V. A 3.3 V logic HIGH exceeds V_IH, and its LOW remains below V_IL, ensuring reliable enable/disable control even with 3.3 V microcontrollers operating from a separate 5 V rail.

Does the device require external pull-up or pull-down resistors on A/B lines?

No. The PI5C34X245BE has no internal terminations or biasing. When disabled, A and B pins present high-impedance (Hi-Z) states with only 6 pF off-capacitance. External termination must be provided by the system design - typically at driver or receiver ends - per signal integrity requirements.

How does thermal performance scale with simultaneous switching of all 32 bits?

With all 32 bits enabled and 48 mA per switch (max), total worst-case conduction loss is <120 mW. Combined with the BQSOP package's θ_JA ≈ 60°C/W, junction rise stays below 8°C above ambient - well within the –40°C to +85°C rating and eliminating need for heatsinking in typical applications.