Diodes Incorporated PI74AVC164245AEX

Overview

PI74AVC164245AEX 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 PI74AVC164245AEX datasheet, PI74AVC164245AEX pinout, PI74AVC164245AEX application, or PI74AVC164245AEX equivalent, key selection criteria include VCCA/VCCB rail separation, propagation delay (tPD ≤ 6.4 ns at VCCA = 2.5V), output skew (tsk(o) ≤ 5.0 ns), 3-state enable timing (tEN/tDIS), and package-specific thermal impedance (TSSOP-A: 89°C/W).

Technical Context

The PI74AVC164245AEX implements two independent 8-bit transceiver sections, each with direction control (DIR) and output-enable (OE) inputs operating at LVTTL logic levels. Its dual-supply architecture isolates A-port I/Os (1.8–2.5V tolerant) from B-port I/Os (3.3V tolerant), allowing simultaneous up-translation (A→B) and down-translation (B→A) without external biasing.

Each port's I/O structure includes input clamp diodes (±50 mA), ±50 mA continuous output drive, and input leakage < ±5 µA. The device uses Pericom's 0.35 µm CMOS process, achieving typical propagation delays of 5.1 ns (A→B) and 5.1 ns (B→A) at CL = 30 pF, with guaranteed tPD ≤ 6.4 ns across temperature and voltage extremes.

Key Specifications

Pinout & Package

PI74AVC164245AEX is packaged in a 48-pin plastic 240 mil TSSOP (Package Code A), with 0.5 mm pitch, 7.6 mm × 6.1 mm body, and exposed thermal pad not present. Pin numbering follows standard counter-clockwise layout starting from pin 1 (1DIR) at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245DGGR and TXB0108PWR, PI74AVC164245AEX offers tighter propagation delay (6.4 ns vs. 7.2 ns), lower ICC (3 mA vs. 10 mA), and optimized 1.8–2.5V/3.3V operation - making it preferred for deterministic, low-power, 16-bit industrial bus translation.

Availability

PI74AVC164245AEX is available at Aetrix Electronics and suitable for DDR memory interfaces, FPGA I/O bridging, PCIe slot adapters, and embedded test equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for PI74AVC164245AEX 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-performance interface and signal-integrity solutions, including clock management, USB, PCI Express, and logic devices.

The AVC logic family targets low-voltage, high-speed bus translation in mixed-signal systems, emphasizing minimal propagation delay, precise skew control, and robust dual-supply operation for FPGA, memory, and processor interconnects.

FAQ

What is the maximum allowable voltage on A-port I/O pins when VCCA = 0V?

When VCCA is unpowered (0V), the absolute maximum voltage on A-port I/O pins is –0.5V to VCCA + 0.5V = +0.5V. Exceeding +0.5V risks forward-biasing internal ESD diodes and causing excessive current flow. System design must ensure A-port signals remain ≤0.5V during VCCA power-down sequences.

Can PI74AVC164245AEX translate from 3.3V to 1.8V and simultaneously from 1.8V to 3.3V?

Yes - the device supports concurrent bidirectional translation. With DIR low, data flows A→B (1.8V→3.3V); with DIR high, data flows B→A (3.3V→1.8V). Both directions operate independently per octet, and both ports remain active simultaneously under valid OE control.

Is a pull-up resistor required on the OE pin, and what value should be used?

Yes - to ensure high-impedance outputs during power-up/power-down, OE must be tied to its associated VCC (VCCA for 1OE/2OE) via a pull-up resistor. Minimum value is determined by the driver's sink capability: for 21 mA sink current and 0.4V logic-low threshold, R_PULLUP ≤ (VCCA – 0.4V)/21 mA ≈ 81 kΩ at VCCA = 2.5V.

How does thermal performance differ among SSOP (V), TSSOP (A), and TVSOP (K) packages?

TSSOP-A has θ_JA = 89°C/W, SSOP-V is 94°C/W, and TVSOP-K is 58°C/W. The smaller TVSOP-K offers best thermal efficiency but requires tighter layout control; TSSOP-A balances manufacturability and thermal performance for most industrial PCBs; SSOP-V suits legacy board designs with wider pitch constraints.