Diodes Incorporated PI5C32X245BEX

Overview

PI5C32X245BEX 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) - deployed in high-speed notebook memory bus isolation and hot-swap I/O expansion.

For engineers reviewing the PI5C32X245BEX datasheet, PI5C32X245BEX pinout, PI5C32X245BEX application, or PI5C32X245BEX equivalent, key selection criteria include bus enable timing (tPZH ≤ 6.5 ns), bidirectional signal integrity under 50pF load, industrial temperature support (–40°C to +85°C), and Pb-free BQSOP-40 package compatibility.

Technical Context

The PI5C32X245BEX implements a passive FET-based analog bus switch architecture with no internal logic or level translation - enabling true bidirectional, rail-to-rail signal pass-through between Bus A (A0–A15) and Bus B (B0–B15). Each channel operates independently under its respective BE control line.

Its near-zero propagation delay arises from absence of active buffering; delay is governed solely by RC time constant of 5Ω R_ON and load capacitance (e.g., 0.25 ns for 50pF). The device draws only leakage-level supply current when disabled, making it suitable for power-gated subsystems.

Key Specifications

Pinout & Package

Package: 40-pin BQSOP (150-mil wide, Pb-free & Green compliant), body dimensions 10.16 × 7.49 mm, 0.635 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PI5C32X245BEX, the PI5C32X245BE offers identical performance with RoHS compliance, while SN74CBT16245DGGR trades 5× higher standby current and slower enable timing for broader distributor availability - critical for long-lifecycle industrial programs.

Availability

PI5C32X245BEX is available at Aetrix Electronics and suitable for notebook memory expansion, docking interface routing, PCIe lane sharing, and industrial backplane isolation requiring stable component supply and Pb-free compliance.

Supply support for PI5C32X245BEX 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, timing, and signal-integrity solutions for computing and communications infrastructure.

The PI5C32X245 belongs to Pericom's low-voltage CMOS bus switch product line, designed specifically for transparent, low-latency, low-power signal routing in portable and thermally constrained systems.

FAQ

What is the maximum capacitive load the PI5C32X245BEX can drive while maintaining specified propagation delay?

The datasheet specifies t_PLH/t_PHL ≤ 0.25 ns at C_L = 50pF with R_L = 500Ω. Performance degrades linearly with load capacitance; for C_L > 50pF, delay increases by ~0.005 ns/pF due to RC time constant. Layout parasitics must stay below 3 pF per trace to meet spec.

Can PI5C32X245BEX operate with mixed-voltage buses (e.g., 3.3V A-side, 5V B-side)?

No. The device requires a single V_CC supply (4.5–5.5V) and has no level-shifting capability. Both A and B ports must remain within –0.5V to V_CC + 0.5V. Driving a 3.3V logic signal into a 5V-biased port risks violating absolute maximum ratings on clamp diodes.

Is thermal derating required when operating at 85°C ambient with 5V supply?

No thermal derating is specified. The device is characterized across –40°C to +85°C at full V_CC range. Power dissipation remains < 10 µW in active state and < 1 µW in standby - well below the 0.5W absolute maximum rating even at max temperature.

Does PI5C32X245BEX support hot-swap insertion while powered?

Yes - its bus-hold-free architecture and ±1 mA input current limit allow safe live insertion. However, BE pins must be held inactive (high) until power stabilization and reference voltage settling are confirmed, per Pericom Application Note AN-204.