Diodes Incorporated PI74LVCC4245ALE

Overview

PI74LVCC4245ALE from Pericom Semiconductor is an 8-bit non-inverting bidirectional bus transceiver with dual independent supply rails (VCCA = 4.5–5.5 V, VCCB = 2.7–5.5 V), enabling level translation between 3.3 V and 5 V buses. It features active-low 3-state output enable (OE), direction control (DIR), and supports asynchronous two-way data flow in industrial embedded systems requiring voltage-domain isolation.

For engineers reviewing the PI74LVCC4245ALE datasheet, PI74LVCC4245ALE pinout, PI74LVCC4245ALE application, or PI74LVCC4245ALE equivalent, key selection criteria include dual-supply voltage tolerance, propagation delay under mixed-rail conditions (tPHL/tPLH ≤ 6.2 ns), 3-state leakage (±5 µA), industrial temperature range (–40°C to +85°C), and TSSOP-24 package compatibility with high-density PCB layouts.

Technical Context

This transceiver implements a CMOS-based dual-rail I/O architecture where A-port logic levels track VCCA (5 V nominal) and B-port levels track VCCB (3.3 V or 5 V). Direction control is synchronous with data transfer-DIR must be stable before data launch to avoid bus contention.

Output enable (OE) independently places both A and B ports into high-impedance state regardless of DIR state. The device meets JESD78 latch-up immunity (>200 mA) and JESD22 ESD ratings (2000 V HBM, 200 V MM), supporting robust operation in noisy industrial environments.

Key Specifications

Pinout & Package

PI74LVCC4245ALE is housed in a 24-pin plastic TSSOP (173-mil width, JEDEC MO-153), with exposed pad not electrically connected. Pin pitch is 0.65 mm; body dimensions are 7.9 mm × 4.5 mm × 1.2 mm (max height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4245APWR and TXB0108PWR, PI74LVCC4245ALE provides tighter propagation delay control (≤6.2 ns), higher noise immunity at 2.7 V VCCB operation, and explicit DIR timing for deterministic bus arbitration-making it optimal for industrial backplanes and real-time embedded interconnects.

Availability

PI74LVCC4245ALE is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded CPU-peripheral bridges, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for PI74LVCC4245ALE 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 emphasis on signal integrity and power-efficient logic for industrial and communications infrastructure.

The PI74LVC series delivers advanced submicron CMOS logic optimized for speed, low power, and robustness in mixed-voltage system interconnects-designed specifically for bridging legacy and next-generation digital subsystems.

FAQ

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

The absolute maximum ratings specify VCCA and VCCB each up to +7 V, but the recommended operating range requires both supplies to remain within their respective limits (VCCA: 4.5–5.5 V; VCCB: 2.7–5.5 V). No differential voltage limit is defined-operation is valid when both rails are within spec, even at opposite extremes (e.g., VCCA = 5.5 V, VCCB = 2.7 V).

Can OE and DIR be tied together for simplified control?

No-OE and DIR serve independent functions: OE controls 3-state output enable/disable for both ports, while DIR selects data direction. Tying them risks unintended bus contention (e.g., OE = LOW + DIR = LOW forces B→A flow while disabling outputs). They must be driven separately per application timing requirements.

Is the NC pin (Pin 23) safe to connect to ground or VCC?

No-Pin 23 is explicitly marked "No Internal Connect" in the datasheet. Connecting it to any voltage violates the manufacturer's design intent and may cause unpredictable behavior or increased leakage. It must remain floating and unconnected on the PCB.

Does PI74LVCC4245ALE support hot-swap or live-insertion?

It supports controlled hot-swap when power sequencing guidelines are followed: GND established first, VCCA ramped before VCCB, and OE asserted before DIR changes. However, no built-in hot-swap protection (e.g., slew-rate limiting, current limiting) is provided-the system-level design must manage inrush and bus settling.