Diodes Incorporated PI74AVC164245LAA

Overview

PI74AVC164245LAA from Pericom Semiconductor is a 16-bit dual-octal noninverting bus transceiver with independent 1.5V–2.5V (VCCA) and 3.3V (VCCB) supply rails, enabling bidirectional level translation between low-voltage logic domains and 3.3V systems. It features 3-state outputs, industrial temperature range (–40°C to +85°C), and is packaged in a Pb-free 48-pin TSSOP (A). It is used in mixed-voltage memory interfaces and FPGA I/O bridging.

For engineers reviewing the PI74AVC164245LAA datasheet, PI74AVC164245LAA pinout, PI74AVC164245LAA application, or PI74AVC164245LAA equivalent, key selection considerations include VCCA/VCCB rail separation, DIR/OE control referenced to VCCB, 3-state timing (tEN/tDIS), voltage translation directionality, and thermal impedance (89°C/W for TSSOP-A).

Technical Context

This device implements two independent 8-bit transceiver sections, each with direction (DIR) and output-enable (OE) inputs referenced to VCCB (3.3V), ensuring robust control signaling in mixed-supply systems. The A-side I/Os tolerate –0.5V to VCCA+0.5V, while B-side I/Os support –0.5V to VCCB+0.5V, enabling safe interfacing across voltage domains.

It operates asynchronously with no internal clock; data flow is determined solely by DIR state and OE assertion. Output disable (high-impedance) is guaranteed during power-up/down when OE is pulled up to VCCB via an external resistor, preventing bus contention in system initialization sequences.

Key Specifications

Pinout & Package

Package: 48-pin plastic 240-mil wide TSSOP (A), Pb-free and RoHS-compliant, body size 12.6mm × 6.2mm × 1.2mm max.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level-shifting transceiver applications.

Compared with SN74AVCH16T245DGGR and TXB0108PWR, PI74AVC164245LAA provides deterministic DIR/OE control, true dual-rail independence for robust power sequencing, and 16-bit width - making it optimal for synchronous, high-reliability mixed-voltage bus bridging where timing predictability and rail isolation are critical.

Availability

PI74AVC164245LAA is available at Aetrix Electronics and suitable for FPGA I/O expansion, memory subsystem bridging, and industrial PLC I/O upgrading requiring stable component supply and long-term manufacturability.

Supply support for PI74AVC164245LAA 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 ICs, clock management, and signal-integrity solutions for computing, communications, and industrial markets.

The PI74AVC164245LAA belongs to Pericom's AVC-family of advanced CMOS bus transceivers, designed specifically for reliable, low-skew voltage translation in multi-rail embedded systems with strict power sequencing requirements.

FAQ

Can PI74AVC164245LAA translate between 1.8V and 3.3V in both directions simultaneously?

Yes. With VCCA = 1.8V and VCCB = 3.3V, the device supports concurrent A→B and B→A translation using separate DIR controls per octal section. Each 8-bit bank operates independently, allowing simultaneous bidirectional flow across the same physical bus when coordinated by system logic.

What is the minimum recommended pull-up resistor value for OE when VCCB = 3.3V?

The datasheet specifies OE must be pulled to VCCB via a resistor whose minimum value is determined by the driver's current-sinking capability. For VCCB = 3.3V, OE sinks up to 21mA in low state; a 1.5kΩ resistor limits current to ~2.2mA, ensuring reliable low-level assertion while minimizing power draw and noise coupling.

Does PI74AVC164245LAA support hot insertion or live bus swapping?

No. While its I/Os tolerate –0.5V to VCC+0.5V, the device lacks true hot-swap protection circuitry (e.g., slew-rate limiting, back-drive immunity, or power-on reset). Applying VCCA or VCCB while signals are active may exceed absolute maximum ratings; power sequencing per datasheet guidelines is mandatory.

How does the 48-pin TSSOP (A) package compare thermally to the TVSOP (K) variant?

The TSSOP-A package has θJA = 89°C/W, while TVSOP-K is rated at 58°C/W due to its smaller footprint and improved thermal pad exposure. For continuous 50mA per output operation at +85°C ambient, the K-package allows ~15% higher power dissipation before junction temperature exceeds 125°C - making it preferable in thermally constrained layouts.