Diodes Incorporated PI74AVC164245AAEX

Overview

PI74AVC164245AAEX from Pericom Semiconductor is a 16-bit dual-octal noninverting bus transceiver with independent 1.8–2.5V (VCCA) and 3.3V (VCCB) supply rails, enabling bidirectional level translation between low-voltage logic domains. It features 3-state outputs, industrial temperature operation (–40°C to +85°C), and supports asynchronous data bus interfacing in mixed-voltage systems such as DDR memory interfaces and FPGA I/O bridging.

For engineers reviewing the PI74AVC164245AAEX datasheet, PI74AVC164245AAEX pinout, PI74AVC164245AAEX application, or PI74AVC164245AAEX equivalent, key selection criteria include verified 1.8V↔3.3V bidirectional translation capability, guaranteed 3-state output isolation during power sequencing, propagation delay under 6.4 ns at 30 pF load, thermal impedance of 89°C/W (TSSOP-A package), and compatibility with LVTTL input thresholds on both A and B ports.

Technical Context

The PI74AVC164245AAEX implements two independent 8-bit transceiver sections, each with direction control (DIR) and output-enable (OE) inputs operating at LVTTL voltage levels. Its dual-supply architecture isolates VCCA (1.8–2.5V) and VCCB (3.3V) domains, allowing simultaneous translation from A-to-B and B-to-A without level-shifting external components.

Each port's I/O structure includes input clamp diodes rated for ±50 mA, rail-to-rail input voltage tolerance (–0.5V to VCC+0.5V per port), and output drive strength of ±21 mA at VCCB=3.3V or ±8 mA at VCCA=1.8V. The device uses Pericom's 0.35 µm CMOS process to achieve sub-6 ns propagation delays while maintaining <3 mA ICC at 25°C.

Key Specifications

Pinout & Package

PI74AVC164245AAEX is packaged in a 48-pin plastic TSSOP (A) with 0.5 mm pitch, 7.6 mm × 12.5 mm body, and exposed thermal pad not present. Pin numbering follows standard dual-row TSSOP convention (1–24 top row left-to-right, 25–48 bottom row right-to-left).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245DGGR and TXB0108PWR, PI74AVC164245AAEX delivers deterministic 16-bit direction control, tighter propagation skew (<3 ns), and validated industrial-temperature performance at 1.8V→3.3V - making it optimal for synchronous parallel bus translation where timing predictability and voltage-specific reliability are critical.

Availability

PI74AVC164245AAEX is available at Aetrix Electronics and suitable for DDR memory interfaces, FPGA I/O bridging, microcontroller bus expansion, and industrial PLC backplane designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PI74AVC164245AAEX 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) is a fabless semiconductor company specializing in high-performance interface, timing, and signal-integrity solutions for computing, communications, and industrial markets.

The PI74AVC164245 belongs to Pericom's AVC logic family, designed specifically for low-voltage, high-speed bidirectional level translation in mixed-supply systems - targeting applications where power efficiency, timing precision, and robustness across voltage domains are essential.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB?

VCCA and VCCB may operate at different voltages within their respective specified ranges (VCCA: 1.8–2.5V; VCCB: 3.3V ±0.3V), but the absolute maximum ratings limit VCCA to ≤3.8V and VCCB to ≤4.6V. No minimum differential is required - the device functions correctly with VCCA = 1.8V and VCCB = 3.3V simultaneously, as confirmed in the recommended operating conditions tables.

How should unused DIR and OE inputs be terminated?

Unused DIR and OE inputs must be held at a valid logic level - either tied to VCCA (for DIR/OE referenced to A-side) or VCCB (for B-side referenced controls), or pulled up/down using resistors. The datasheet explicitly states that floating inputs are prohibited; OE should use a ≥10 kΩ pull-up to its associated VCC to guarantee high-impedance output during power-up sequences.

Does PI74AVC164245AAEX support hot-swapping between voltage domains?

Yes - the device supports hot-swap operation due to its independent dual-supply architecture and rail-to-rail input tolerance (–0.5V to VCC+0.5V per port). When one supply is unpowered, the corresponding I/Os enter high-impedance mode with ≤±10 µA leakage, preventing back-drive or latch-up. This behavior is validated in the absolute maximum ratings and recommended operating conditions.

What is the thermal resistance (θJA) for the TSSOP (A) package?

The junction-to-ambient thermal resistance (θJA) for the 48-pin TSSOP (A) package is 89°C/W, as measured per JESD 51 standards. This value assumes standard JEDEC 2-layer board layout (1-inch² copper pad per side, 2 oz copper). For sustained 100% output activity, junction temperature must remain below 125°C - limiting continuous power dissipation to ~360 mW under typical ambient conditions.