Diodes Incorporated PI3CH3345LEX

Overview

PI3CH3345 from Pericom Semiconductor is an 8-bit, dual-enable bus switch IC designed for high-bandwidth signal routing in low-voltage systems. It supports 1.8V/2.5V/3.3V supply operation, delivers 500 MHz bandwidth, features near-zero propagation delay (≤0.3 ns), and enables rail-to-rail analog/digital switching - e.g., 0–5V with 3.3V V_CC. It is used in hot-plug data switching between backplane and add-in cards.

For engineers reviewing the PI3CH3345 datasheet, PI3CH3345 pinout, PI3CH3345 application, or PI3CH3345 equivalent, key selection criteria include dual active-low enable timing (t_PZH/t_PHZ ≤9.0/9.0 ns at 3.3V), 5 Ω typical on-resistance, 5V I/O tolerance in both ON/OFF states, and TSSOP-20/TQFN-20 package compatibility with hot-insertion systems.

Technical Context

The PI3CH3345 implements two independent active-low enable controls (EN and EN) to gate eight bidirectional A↔B channels without introducing ground bounce or added propagation delay. Its switch architecture uses low-threshold MOSFETs optimized for sub-1 ns RC-limited delay with 10 pF loads.

It operates across three supply rails (1.8V, 2.5V, 3.3V) while maintaining 5V-tolerant I/O pins and supporting beyond-rail analog switching - e.g., 0–5V signals with 3.3V V_CC - enabled by internal clamp diodes and robust ESD protection (8 kV HBM).

Key Specifications

Pinout & Package

Available in Pb-free, RoHS-compliant 20-pin TSSOP (173-mil wide) and 20-pin TQFN (ZH) packages. Both share identical pin mapping and thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit bus switch applications.

Compared with SN74CBT3384CDW and TS3USB30E, the PI3CH3345 uniquely combines triple-supply compatibility (1.8/2.5/3.3V), dual active-low enables for phased switching, and 6 V transient tolerance - making it the only option qualified for hot-plug-capable, multi-voltage backplane architectures.

Availability

PI3CH3345 is available at Aetrix Electronics and suitable for high-bandwidth data switching, hot-docking systems, and analog multiplexing requiring stable component supply across industrial, telecom, and test equipment programs.

Supply support for PI3CH3345 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 communications and computing infrastructure.

The PI3CH3345 belongs to Pericom's low-voltage bus switch product line, engineered specifically for hot-pluggable, multi-rail backplane interconnects where signal fidelity, transient resilience, and enable timing control are critical.

FAQ

What is the maximum allowable input voltage when V_CC = 1.8 V?

The PI3CH3345 supports 0–6.0 V DC input voltage regardless of V_CC level. With 1.8 V supply, inputs may swing from 0 V to 6.0 V without damage or functional interruption, enabling safe hot-insertion into higher-voltage backplanes. This is achieved via internal clamp diodes and robust oxide design, validated per JESD78 latch-up testing (>200 mA).

Can EN and EN be driven with different logic families?

Yes - EN and EN accept 1.8V/2.5V/3.3V-compatible logic thresholds and tolerate up to 3.6 V input regardless of V_CC. For example, with V_CC = 1.8 V, EN may be driven by a 3.3 V microcontroller GPIO. VIH is guaranteed ≥1.2 V (1.8V mode) and VIL ≤0.8 V, ensuring interoperability across mixed-voltage control domains without level shifters.

Does the PI3CH3345 support differential signaling without skew degradation?

Yes - its matched 8-channel architecture exhibits ≤1 Ω R_ON mismatch and <0.1 ps inter-channel propagation skew at 3.3 V. Combined with low C_OFF (3.5 pF) and symmetric A↔B topology, it preserves differential pair integrity for LVDS/RSDS up to 800 Mbps. Layout best practices (length-matched traces, ground plane continuity) are required to maintain this performance.

Is there a recommended PCB layout practice for minimizing crosstalk?

Place 100 nF ceramic decoupling capacitors within 5 mm of V_CC and GND pins; use solid ground plane beneath the device; separate A- and B-side traces with ground guard traces; avoid routing sensitive analog signals adjacent to EN/EN control lines. The device's 3.5 pF C_OFF and -60 dB off-isolation at 10 MHz reduce coupling, but board-level shielding remains essential for >100 MHz applications.