Diodes Incorporated PI3B32X384BE

Overview

PI3B32X384BE from Pericom Semiconductor is a 3.3V, 20-bit dual-port bus switch with four independent bus enable inputs (BEA, BEB, BEC, BED), 5 Ω typical ON resistance, 4.5 ns max switching speed, and 0.1 µA typical quiescent current - deployed in high-speed notebook memory bus isolation and hot-plug I/O expansion subsystems.

For engineers reviewing the PI3B32X384BE datasheet, PI3B32X384BE pinout, PI3B32X384BE application, or PI3B32X384BE equivalent, key selection criteria include verified 5 Ω R_ON, TTL-compatible control logic, rail-to-rail input tolerance up to +3.6V, and BQSOP-48 package compatibility with space-constrained embedded PCB layouts.

Technical Context

The PI3B32X384BE implements four independent 5-bit bidirectional switch banks (A0–A4/B0–B4, A5–A9/B5–B9, A10–A14/B10–B14, A15–A19/B15–B19), each controlled by a dedicated active-low bus enable signal. Each switch bank provides direct metal-like connection between A and B ports when enabled, with no added propagation delay beyond RC time constant (~0.25 ns for 50 pF load).

It operates strictly at 3.3V ±10%, supports –40°C to +85°C ambient operation, features rail-to-rail tolerant control inputs (0V to +3.6V), and maintains Hi-Z output state during disable - eliminating ground bounce and signal contention in shared-bus architectures.

Key Specifications

Pinout & Package

Package: 48-pin BQSOP (150-mil wide plastic), Pb-free & Green compliant (E suffix), 3.80 mm × 9.80 mm body, 0.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 20-bit bus switch applications.

Compared with SN74CBT3244DBR and PI3CH481BEX, the PI3B32X384BE uniquely delivers granular 5-bit group control, lowest R_ON, and lowest quiescent current - making it optimal for power- and timing-critical mobile memory and hot-swap interfaces.

Availability

PI3B32X384BE is available at Aetrix Electronics and suitable for notebook memory isolation, hot-plug PCIe expansion, low-power SMBus sharing, and multi-core JTAG routing requiring stable component supply and long-term lifecycle support.

Supply support for PI3B32X384BE 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 markets.

The PI3B32X384BE belongs to the NanoSwitch™ bus switch product line, engineered specifically for zero-delay, low-power, bidirectional signal routing in portable and thermally constrained embedded systems.

FAQ

What is the maximum capacitive load the PI3B32X384BE can drive while maintaining 4.5 ns switching speed?

The 4.5 ns max switching speed is specified at CL = 50 pF and RL = 500 Ω. Driving loads >50 pF increases RC delay proportionally - e.g., 100 pF raises t_SW to ~6.5 ns. Layout parasitics must be included in total CL; keep trace lengths short and avoid stubs.

Can BEA, BEB, BEC, and BED be driven by 1.8V logic outputs?

Yes - control inputs tolerate 0 V to +3.6 V regardless of V_CC. A 1.8V HIGH satisfies VIH ≥ 2.0 V only if V_CC ≥ 2.5 V; however, the device guarantees functional operation down to 1.5V control swing due to internal threshold design. For guaranteed 1.8V compatibility, use external pull-up to 3.3V.

Does the PI3B32X384BE support hot-swap with power sequencing?

Yes - the device supports hot-swap when V_CC and GND are applied before control or A/B signals. Its rail-to-rail input tolerance and Hi-Z disable state prevent latch-up or back-drive during insertion. However, external series resistors (10–22 Ω) on A/B lines are recommended to limit inrush current.

Is there any built-in ESD protection on the A/B pins?

The PI3B32X384BE includes internal clamp diodes to V_CC and GND on all A/B pins, rated to ±18 mA per pin (VIK = –1.2 V). It meets HBM ESD rating of ±2 kV per JEDEC JS-001, but external TVS devices are advised for harsh environments like industrial docking stations.