Diodes Incorporated PI5C32X245BE

Overview

PI5C32X245BE from Pericom Semiconductor is a 16-bit, 2-port bus switch with dual active-low enable inputs (BE1, BE2), 5Ω typical on-resistance, near-zero propagation delay (≤0.25 ns), and ultra-low quiescent current (0.2 µA typical). It enables direct, low-noise bidirectional signal routing between Bus A (A0–A15) and Bus B (B0–B15) in notebook and industrial backplane applications.

For engineers reviewing the PI5C32X245BE datasheet, PI5C32X245BE pinout, PI5C32X245BE application, or PI5C32X245BE equivalent, key selection criteria include its dual-enable control logic, 5Ω R_ON, ±1 µA I_IL/I_IH, –40°C to +85°C operation, and Pb-free BQSOP-40 package compatibility with QS32X245.

Technical Context

The PI5C32X245BE implements a passive FET-based bus switch architecture-no internal logic or level-shifting-ensuring true bidirectional signal transparency. Its dual independent enable pins (BE1, BE2) allow selective activation of either or both 16-bit paths without contention or ground bounce.

Switching behavior follows a simple truth table: when BEn = LOW, corresponding A/B port pair conducts with <5Ω resistance; when BEn = HIGH, that port pair enters high-impedance state. Propagation delay is dominated solely by RC time constant (R_ON × C_LOAD), not internal logic, yielding ≤0.25 ns for 50 pF load.

Key Specifications

Pinout & Package

Package: 40-pin BQSOP (150-mil wide), Pb-free & RoHS-compliant, thermal pad omitted.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus switch applications.

Compared with PI74FCT16245ATPE and SN74CBT16245CPAG, the PI5C32X245BE uniquely delivers dual independent active-LOW enables, 5Ω R_ON, and true zero-delay pass-through-critical for notebook memory expansion and industrial backplane isolation where timing transparency and low power are non-negotiable.

Availability

PI5C32X245BE is available at Aetrix Electronics and suitable for notebook memory expansion interfaces, industrial backplane signal routing, embedded JTAG multiplexing, and legacy peripheral bus arbitration requiring stable component supply and long-term lifecycle support.

Supply support for PI5C32X245BE 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 specializing in high-speed interface, timing, and signal-integrity solutions before its acquisition by Diodes Incorporated in 2017.

The PI5C32X245BE belongs to Pericom's "CBT-style" bus switch product line, designed specifically for low-latency, low-power, voltage-transparent interconnect in portable and industrial computing platforms.

FAQ

What is the maximum capacitive load the PI5C32X245BE can drive while maintaining ≤0.25 ns propagation delay?

The 0.25 ns propagation delay specification assumes a 50 pF load capacitance with 500 Ω termination, per the datasheet switching characteristics table. At higher loads (e.g., 100 pF), the RC time constant increases linearly with C_LOAD, resulting in ~0.5 ns effective delay. For >50 pF systems, layout optimization and driver strength must be verified per actual trace impedance and fanout.

Can BE1 and BE2 be tied together for single-enable operation?

Yes-BE1 and BE2 may be connected to a common enable signal without electrical conflict, as both are active-low inputs with identical VIH/VIL thresholds (2.0 V/0.8 V) and ±1 µA leakage. This configuration reduces control lines but forfeits independent port gating capability documented in the truth table.

Does the PI5C32X245BE support hot-swap or live-insertion scenarios?

Yes-the device has no power-up sequencing requirements, zero DC current path between ports in high-Z state, and absolute maximum ratings allowing –0.5 V to +7.0 V on all I/O pins. Its 5 Ω R_ON and 6 pF capacitance minimize transient coupling during plug-in events, making it suitable for hot-swap backplane applications when used with appropriate series resistors.

Is there a recommended bypass capacitor value and placement for the V_CC pins?

Per the PS7057E datasheet and Pericom's layout guidelines, use two 0.1 µF X7R ceramic capacitors-one placed within 3 mm of each V_CC pin (pins 34 and 35)-and connect them directly to the nearest GND pins (10 and 20) using short, low-inductance traces. Avoid shared vias or daisy-chained ground paths to suppress switching noise.