Diodes Incorporated PI5C34X2245BE

Overview

PI5C34X2245BE from Pericom Semiconductor is a 32-bit, 2-port bus switch with four independent active-low enable inputs (BEn), 25Ω integrated series termination resistors per channel, 5Ω typical on-resistance, near-zero propagation delay (1.25 ns), and ultra-low quiescent current (0.2 μA). It enables direct, low-noise bidirectional data routing between two 32-bit buses in notebook and embedded system memory expansion interfaces.

For engineers reviewing the PI5C34X2245BE datasheet, PI5C34X2245BE pinout, PI5C34X2245BE application, or PI5C34X2245BE equivalent, key selection criteria include bus enable timing (1.5–7.5 ns enable/disable), on-resistance matching (28–48 Ω), input/output capacitance (6–12 pF), industrial temperature range (–40°C to +85°C), and Pb-free BQSOP-80 package compatibility.

Technical Context

The PI5C34X2245BE implements a passive FET-based bus switch architecture with no internal logic or level-shifting-signals pass through with only RC delay from 5Ω R_ON and load capacitance. Its four BEn controls independently gate 8-bit segments (A0–A7/B0–B7, A8–A15/B8–B15, A16–A23/B16–B23, A24–A31/B24–B31), enabling granular bus isolation.

All I/O pins (A0–A31, B0–B31) are bidirectional and electrically identical; no direction pin or internal biasing exists. The built-in 25Ω series resistor per path suppresses signal reflection without external termination, supporting clean 5V TTL/CMOS signaling up to 200 MHz effective data rates under matched load conditions.

Key Specifications

Pinout & Package

Package: 80-pin 150-mil wide plastic BQSOP (Pb-free & Green compliant, JEDEC MO-153 variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with QS34X245, PI5C34X2245BE reduces BOM and layout effort via integrated termination; compared with PI5C3257BE, it delivers full 32-bit coherency and segmented enable control-critical for memory-mapped peripheral isolation without timing fragmentation.

Availability

PI5C34X2245BE is available at Aetrix Electronics and suitable for notebook system design, industrial backplane interconnect, memory expansion modules, and PCI/ISA bridge isolation requiring stable component supply and Pb-free compliance.

Supply support for PI5C34X2245BE 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 PI5C34X2245BE belongs to Pericom's 32-bit bus switch product line, engineered specifically for low-noise, zero-delay parallel bus isolation in space-constrained portable and industrial systems.

FAQ

What is the maximum data rate supported by the PI5C34X2245BE?

The device does not specify a maximum data rate in MHz, but its 1.25 ns propagation delay and 12 pF on-state capacitance support clean signal transmission up to 200 MHz under typical 50 Ω PCB trace conditions. System-level bandwidth depends on driver strength, trace length, and load capacitance-not the switch itself.

Can the PI5C34X2245BE be used with 3.3V logic levels?

No-it is designed exclusively for 5V TTL/CMOS operation. The absolute maximum ratings allow V_CC up to 7.0 V, but VIH/VIL thresholds (2.0 V/0.8 V) and R_ON characterization assume 5V supply. Using 3.3V V_CC violates guaranteed logic level specifications and degrades on-resistance performance.

Is hot-swap operation supported?

Yes-the device tolerates –0.5 V to +7.0 V on all pins with power applied, and its passive switch architecture prevents back-driving or latch-up during live insertion. However, ensure BEn signals are held inactive (HIGH) until V_CC stabilizes to avoid transient glitches on connected buses.

Does the PI5C34X2245BE require decoupling capacitors?

Yes-per standard high-speed digital practice, place one 0.1 μF ceramic capacitor between each V_CC and GND pin pair, located within 3 mm of the BQSOP package. This suppresses supply noise induced by simultaneous switching of multiple 32-bit paths and maintains stable R_ON during fast transitions.