Diodes Incorporated PI74FCT16245ATAE

Overview

PI74FCT16245ATAE from Pericom Semiconductor is a 16-bit bidirectional CMOS transceiver in 48-pin TSSOP (240-mil width), designed for asynchronous two-way data bus interfacing between dissimilar logic domains. It supports 5V ±10% operation, delivers –32mA high-side and 64mA low-side output drive, features power-off disable for live insertion, and exhibits <1.0V typical ground bounce at 25°C.

For engineers reviewing the PI74FCT16245ATAE datasheet, PI74FCT16245ATAE pinout, PI74FCT16245ATAE application, or PI74FCT16245ATAE equivalent, key selection criteria include bidirectional direction control (xDIR), independent 8-bit/16-bit configuration via dual OE/DIR inputs, high-current drive capability, and TSSOP-48 packaging compatibility with backplane and hot-swap systems.

Technical Context

The device implements dual 8-bit or unified 16-bit bidirectional data flow controlled by separate xDIR and xOE signals per side, enabling flexible bus isolation and direction arbitration. Its Fast CMOS architecture ensures propagation delays as low as 1.5ns (min) and 4.1ns (max) under 50pF load, with output skew limited to 0.5ns across all channels.

Power-off disable functionality maintains high-impedance outputs when VCC = 0V (±100µA leakage), supporting safe board insertion into powered backplanes. Input hysteresis (100mV) enhances noise immunity on control lines, while balanced drive strength and controlled edge rates reduce system-level switching noise without external termination.

Key Specifications

Pinout & Package

PI74FCT16245ATAE uses a 48-pin plastic TSSOP package (240-mil width, JEDEC MO-153 variant), Pb-free and RoHS-compliant, with 0.5mm lead pitch and exposed thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bidirectional transceiver applications.

Compared with 74FCT16245CTPY and SN74LVCH16245A, PI74FCT16245ATAE uniquely combines 5V operation, live-insertion support, and TSSOP-48 footprint-making it the sole option for compact, hot-swappable 5V backplane designs requiring guaranteed bus isolation during insertion.

Availability

PI74FCT16245ATAE is available at Aetrix Electronics and suitable for backplane interfacing, industrial PLC bus isolation, hot-swappable storage modules, and legacy bus bridging requiring stable component supply across extended product lifecycles.

Supply support for PI74FCT16245ATAE 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 was a fabless provider of high-speed interface and timing solutions, acquired by Diodes Incorporated in 2016; its legacy logic portfolio remains widely deployed in industrial and telecom infrastructure.

This device belongs to the PI74FCT fast CMOS logic family, engineered specifically for robust 5V bus interfacing in electrically noisy, high-reliability systems requiring live insertion and precise timing control.

FAQ

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

PI74FCT16245ATAE is characterized for CL = 50pF in switching specifications, with guaranteed performance up to 64mA sink current and –32mA source current. At 5V operation, it reliably drives ≥10 standard TTL loads or ≤100pF total net capacitance while maintaining specified propagation delay and ground bounce limits.

Does this part support mixed-voltage operation between Side A and Side B?

No. PI74FCT16245ATAE operates from a single 5V supply (VCC = 5V ±10%) and does not provide voltage translation. Both A-side and B-side I/Os share the same VCC reference and logic thresholds (VIH = 2.0V min, VIL = 0.8V max), requiring matched 5V signaling on both buses.

Can the direction control (xDIR) and output enable (xOE) pins be driven by 3.3V logic?

Yes. Input thresholds (VIH = 2.0V min, VIL = 0.8V max) are compatible with 3.3V CMOS/TTL logic levels. A 3.3V HIGH signal exceeds VIH, and a 3.3V LOW remains below VIL, ensuring reliable control without level shifters in mixed-voltage control plane designs.

Is there an exposed thermal pad on the TSSOP-48 package?

No. The PI74FCT16245ATAE TSSOP-48 package (code "A") has no internal connection to an exposed thermal pad. Thermal dissipation relies on standard PCB copper pour under the body and leads; no solder paste or thermal via requirements apply beyond JEDEC MO-153 mechanical standards.