Diodes Incorporated PI3VT32X245B

Overview

PI3VT32X245B from Pericom Semiconductor is a 16-bit, 2-port bus switch with dual voltage translation capability (3.3V ↔ 2.5V and 2.5V ↔ 1.8V), low ON resistance (5 Ω typical at 3.3V), near-zero propagation delay, and dual Bus Enable inputs (BE1/BE2) for independent port control. It operates from 2.5V or 3.3V supply and is used in mixed-voltage memory and data bus interfaces between SoC and DDR/SDRAM subsystems.

For engineers reviewing the PI3VT32X245B datasheet, PI3VT32X245B pinout, PI3VT32X245B application, or PI3VT32X245B equivalent, key selection criteria include bidirectional level-shifting capability, per-port enable control, ON-resistance stability across voltage domains, thermal performance under continuous 120mA per switch, and BQSOP-40 package compatibility with high-density PCB layouts.

Technical Context

The PI3VT32X245B implements two independent 16-bit transmission gate arrays, each controlled by dedicated BE signals (BE1 for Port A–B0–B15; BE2 for Port A8–A15–B8–B15), enabling selective isolation of 16-bit data lanes. Its CMOS transmission-gate architecture ensures rail-to-rail analog switching without directionality constraints.

It supports true bidirectional voltage translation: with VCC = 3.3V, it translates 3.3V inputs to 2.5V outputs; with VCC = 2.5V, it translates 2.5V inputs to 1.8V outputs. Input/output voltage ranges are specified from –0.5V to VCC + 0.3V, and maximum output current per switch is ±120mA.

Key Specifications

Pinout & Package

Package: 40-pin BQSOP (150-mil wide plastic), JEDEC MO-154 BB compliant, surface-mount, lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional voltage translation applications.

Compared with SN74AVC16T245 and NTB0102, PI3VT32X245B uniquely delivers per-8-bit enable control, 5Ω R_ON, and guaranteed 2.5V↔1.8V translation in a single 40-pin package - critical for DDR2/LPDDR interconnects requiring timing precision and layout efficiency.

Availability

PI3VT32X245B is available at Aetrix Electronics and suitable for DDR2 memory subsystems, SoC-to-SDRAM bridges, and industrial PLC backplanes requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for PI3VT32X245B 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 (now part of Diodes Incorporated) specialized in high-speed interface and timing solutions, with expertise in signal integrity, low-jitter clock distribution, and voltage translation ICs for communications and computing markets.

The PI3VT series was designed specifically for low-latency, bidirectional voltage translation in memory and data-path applications - targeting DDR, SDRAM, and FPGA interconnects where R_ON, capacitance, and enable granularity directly impact timing margin.

FAQ

Can PI3VT32X245B operate with VCC = 2.5V while translating 3.3V inputs?

No. The device does not support overvoltage on inputs beyond VCC + 0.3V. With VCC = 2.5V, absolute maximum input voltage is 2.8V. Applying 3.3V inputs would exceed the DC input voltage rating (–0.5V to VCC + 0.3V) and risk permanent damage. It only supports down-translation: 3.3V→2.5V at VCC=3.3V, or 2.5V→1.8V at VCC=2.5V.

Is the PI3VT32X245B pin-compatible with PI3VT3245B?

No. PI3VT3245B is a non-translating 16-bit bus switch (no voltage translation function) with different truth table behavior and identical pinout but incompatible logic-level thresholds. While both use BQSOP-40, their BE input interpretation and output voltage behavior differ fundamentally - substitution will cause functional failure in translation-dependent designs.

What is the maximum capacitive load this device can drive reliably?

The device is characterized up to 50pF load capacitance per switch, with propagation delay and rise/fall times specified under that condition. Driving >50pF increases RC delay linearly (τ = R_ON × C_L); at 100pF, τ ≈ 0.5ns, which may violate setup/hold margins in >100MHz systems. For loads >50pF, verify timing margins using actual board trace capacitance and driver strength.

Does PI3VT32X245B require external pull-up or pull-down resistors on A/B pins?

No. The device has no internal termination and presents high-impedance (Hi-Z) when disabled. External biasing is required only if floating states must be avoided during disable - e.g., 10kΩ pull-downs on B-side pins to prevent noise coupling in idle mode. No pull resistors are needed for normal enabled operation.