Diodes Incorporated PI5C32161CAE

Overview

PI5C32161CAE from Pericom Semiconductor is a 16-to-32-bit bidirectional demultiplexing bus switch optimized for PCI Hot-Plug insertion. It features 5 Ω typical on-resistance, –2 V undershoot protection on the A port, precharge bias on B ports to suppress live-insertion noise, 250 ps propagation delay, and operates from 3.0 V to 3.6 V. Used in hot-swap controller interfaces for server backplanes.

For engineers reviewing the PI5C32161CAE datasheet, PI5C32161CAE pinout, PI5C32161CAE application, or PI5C32161CAE equivalent, key selection criteria include channel resistance matching, undershoot tolerance on A-side signals, B-port precharge voltage handling, and TSSOP-56 thermal and routing constraints in high-density PCI slot designs.

Technical Context

The PI5C32161CAE implements dual 16-bit demux paths (SEL1/SEL2) enabling independent switching of A-port signals to either B1 or B2 banks. Each path uses CMOS transmission-gate topology with integrated VBIAS1/VBIAS2 precharge circuitry to clamp floating B lines during hot insertion.

It supports rail-to-rail logic inputs up to +5.5 V independent of VCC, requires strict power sequencing (VCC before VBIAS/control), and delivers sub-nanosecond signal integrity via low 15 pF max ON capacitance and 3.5 pF input capacitance - critical for maintaining PCI timing margins under dynamic load.

Key Specifications

Pinout & Package

Package: 56-pin plastic TSSOP (A), 0.5 mm pitch, 14.0 mm × 6.1 mm footprint, 1.2 mm max height, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PI5C32161CE and SN74CBT3244PWR, the PI5C32161CAE uniquely combines 16:32 demux capability, –2 V A-port undershoot tolerance, and dual VBIAS precharge - making it irreplaceable for PCI-SIG-compliant hot-swap implementations where signal integrity during live insertion is non-negotiable.

Availability

PI5C32161CAE is available at Aetrix Electronics and suitable for PCI Express slot controllers, server backplane hot-swap modules, and industrial PLC I/O carrier boards requiring stable component supply and long-term lifecycle support.

Supply support for PI5C32161CAE 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 timing solutions, acquired by Diodes Incorporated in 2016; its logic portfolio remains actively supported and manufactured.

The PI5C series targets PCI, PCI-X, and legacy parallel bus applications requiring ultra-low on-resistance, hot-plug robustness, and sub-nanosecond timing - designed specifically for enterprise and industrial backplane interconnects.

FAQ

What is the maximum allowable undershoot on the B1/B2 ports?

The datasheet specifies –2 V undershoot tolerance only on the A port. B1 and B2 ports have no undershoot rating beyond the absolute maximum of –0.5 V relative to GND. Exceeding this risks latch-up or oxide damage due to lack of integrated clamping diodes on B-side terminals.

Can SEL1 and SEL2 be driven simultaneously high?

Yes - driving both SEL1 and SEL2 high connects each A pin to both corresponding B1 and B2 pins simultaneously. This mode is electrically valid but increases capacitive loading; total CON rises to ~28 pF per channel, reducing maximum toggle frequency to ~70 MHz at 20 pF load.

Is VBIAS1 required to be equal to VBIAS2?

No - VBIAS1 and VBIAS2 may be independently set between 1.3 V and VCC. This allows asymmetric precharge tuning: e.g., VBIAS1 = 1.8 V for low-noise analog sensor lines, VBIAS2 = 3.3 V for digital control buses, minimizing crosstalk in mixed-signal hot-swap modules.

Does the device support hot insertion at VCC = 3.0 V?

Yes - all electrical characteristics including RON (5 Ω typ), tPLH (0.25 ns), and undershoot protection are guaranteed over the full 3.0 V to 3.6 V range. At 3.0 V, VBIAS must be ≥1.3 V and control inputs must meet VIH ≥2.0 V per DC specs.