Diodes Incorporated PI5C3400Q

Overview

PI5C3400Q from Pericom Semiconductor is a 4-bit, 4-port bus exchange switch in 24-pin QSOP package, featuring individual bit-swapping control (BX0–BX3), 5 Ω ON-resistance, zero propagation delay, and ultra-low quiescent current (0.2 µA typical). It enables dynamic AB/CD bus pair reconfiguration in real-time memory or data-path routing applications.

For engineers reviewing the PI5C3400Q datasheet, PI5C3400Q pinout, PI5C3400Q application, or PI5C3400Q equivalent, key selection criteria include bus exchange timing (tBX ≤ 6.5 ns), ON-resistance matching across all four bits, BE-active-L control logic, and compatibility with 5 V TTL/CMOS signal levels in high-density PCB layouts.

Technical Context

The PI5C3400Q implements four independent bilateral analog switches per bit, each controlled by BE (global enable) and BXn (per-bit exchange select), allowing AB↔CD signal path inversion without latching or clocking. Its CMOS transmission-gate architecture ensures rail-to-rail signal pass-through with no DC offset or level-shifting.

Switch operation is purely flow-through: when enabled, signals propagate with only RC delay from 5 Ω R_ON and load capacitance - not added gate delay. Ground bounce is eliminated because no internal node switching occurs during data flow, unlike latch-based or multiplexer-based alternatives.

Key Specifications

Pinout & Package

PI5C3400Q is housed in a 24-pin plastic QSOP (150 mil wide), with 0.65 mm lead pitch and standard JEDEC MO-137AC footprint. Pin 1 marked via notch or dot; pins 12 and 13 are GND and VCC respectively.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus exchange switch applications.

Compared with SN74CBT3244DBR and PI5C3257Q, the PI5C3400Q uniquely delivers true bidirectional, per-bit bus exchange - essential for dynamic memory interleaving and PCIe lane remapping where AB/CD signal pair inversion must occur synchronously without added latency or direction control overhead.

Availability

PI5C3400Q is available at Aetrix Electronics and suitable for memory controller backplanes, industrial I/O modules, and notebook docking station hubs requiring stable component supply and long-term obsolescence management.

Supply support for PI5C3400Q 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 of high-speed interface and signal integrity solutions, acquired by Diodes Incorporated in 2016; legacy products maintain full datasheet compliance and industrial qualification.

The PI5C series targets low-latency, low-power logic switching for embedded computing and communications infrastructure, emphasizing zero-delay analog-switch behavior in space-constrained PCB environments.

FAQ

What is the maximum capacitive load the PI5C3400Q can drive while maintaining specified tPLH/tPHL?

The PI5C3400Q is characterized for CL = 50 pF in switching tests. With its 5 Ω R_ON, it drives loads up to 100 pF while keeping propagation delay below 0.5 ns (RC ≈ 0.5 ns). Beyond 100 pF, rise/fall times degrade linearly - design margin requires limiting trace + receiver capacitance to ≤75 pF for Gen2-compliant timing.

Can PI5C3400Q operate reliably with 3.3 V logic inputs while powered at 5 V VCC?

Yes. Its VIH min is 2.0 V and VIL max is 0.8 V at 5 V VCC, fully compatible with 3.3 V TTL outputs. Input clamp diodes (VIK = –0.7 V) protect against undershoot, and the device draws no significant current from 3.3 V drivers due to ±1 µA IIH/IIL specs.

Is the NC pin (Pin 24) required to be tied to ground or left floating?

Pin 24 is internally unconnected and must be left floating per datasheet guidance. Grounding it may induce leakage or EMI coupling in high-frequency layouts; however, if board routing constraints require termination, tie to GND via ≥10 kΩ resistor - never direct short.

Does the PI5C3400Q support hot insertion or live bus swapping without glitching?

Yes - its zero-ground-bounce and flow-through architecture prevents transient glitches during BE or BX transitions. However, ensure BE and BX signals transition only when A/B/C/D buses are in high-Z or logic-stable states; asynchronous toggling during active data transfer may cause momentary contention on shared lines.