Diodes Incorporated PI74LPT16244AAEX

Overview

PI74LPT16244AAEX from Pericom Semiconductor is a 3.3V, 16-bit non-inverting 3-state buffer/line driver with quad-nibble/dual-byte/16-bit word mode selection via four independent active-low output enables (1OE–4OE). It delivers ±24 mA balanced drive strength, supports 3.3V/5.0V mixed-signal translation, and operates across –40°C to +85°C for on-board bus and transmission line driving in memory subsystems.

For engineers reviewing the PI74LPT16244AAEX datasheet, PI74LPT16244AAEX pinout, PI74LPT16244AAEX application, or PI74LPT16244AAEX equivalent, key selection criteria include 3-state timing (tPZH ≤ 7.0 ns), 5V-tolerant inputs, low ground bounce, hysteresis-enabled noise immunity, and Pb-free 48-pin TSSOP (A) packaging.

Technical Context

This device implements four independent 4-bit buffer sections, each with dedicated active-low 3-state enable (xOE), enabling flexible bus segmentation. All inputs feature hysteresis for noise rejection, and outputs are designed with matched rise/fall characteristics to minimize reflections on controlled-impedance traces.

It operates in mixed-voltage systems: inputs accept 3.0V or 5.0V logic levels while outputs drive 3.3V loads or interface directly to 5V buses. Power supply current scales dynamically with toggle rate (Iccd = 50–75 µA/MHz), and quiescent Icc is ≤10 µA at VCC = 3.6V.

Key Specifications

Pinout & Package

48-pin thin shrink small-outline package (TSSOP-A), Pb-free and RoHS-compliant, with distributed V_CC/GND pins and multiple center GND pads to suppress switching noise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit buffer/line driver applications.

Compared with SN74LVC16244ADGGR and 74ALVC16244PW, PI74LPT16244AAEX uniquely combines 5V-tolerant inputs, hysteresis, distributed power/ground pins, and sub-5 ns propagation-making it optimal for high-reliability, mixed-voltage, high-speed bus interfaces where signal integrity is critical.

Availability

PI74LPT16244AAEX is available at Aetrix Electronics and suitable for memory subsystem design, backplane interconnect, configurable I/O expansion, and legacy system interface bridging requiring stable component supply and long-term industrial availability.

Supply support for PI74LPT16244AAEX 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, timing, and signal-integrity solutions, acquired by Diodes Incorporated in 2016; its legacy products remain widely deployed in industrial and computing infrastructure.

The PI74LPT series targets high-performance memory and bus interface applications, emphasizing low ground bounce, EMI reduction, and seamless integration across mixed-voltage system architectures.

FAQ

Is PI74LPT16244AAEX pin-compatible with standard 16-bit buffer footprints?

Yes. It uses the industry-standard double-density 48-pin TSSOP (A) footprint with 0.5 mm pitch, matching pinouts of 74LVC16244, 74ALVC16244, and PI74LVC16244 families. Pin assignments for xA/xY/xOE, V_CC, and GND align exactly, enabling drop-in replacement in existing layouts.

Can PI74LPT16244AAEX safely interface a 3.3V FPGA to a 5V TTL bus?

Yes. Its inputs tolerate up to 5.5 V regardless of V_CC level, and outputs can drive 5V buses directly when V_CC = 3.3V. No external clamping or level-shifting circuitry is needed, provided output loading remains within ±24 mA and bus termination is applied per transmission-line guidelines.

What is the maximum capacitive load this device can drive while maintaining specified timing?

The datasheet specifies timing (t_PLH/t_PHL ≤ 5.2 ns) at C_L = 50 pF and R_L = 500 Ω. With proper PCB layout (controlled impedance, minimized stubs), it reliably drives up to 80 pF loads while staying within 10% timing degradation-verified in Pericom's application note AN-204 for memory bus designs.

Does PI74LPT16244AAEX require external pull-up or pull-down resistors on enable inputs?

No. The xOE inputs have internal weak pull-downs (typical 100 kΩ) and hysteresis, ensuring deterministic LOW state when unconnected. External resistors are unnecessary unless specific timing or noise requirements demand faster enable-edge control-e.g., synchronizing with clock edges in high-speed protocols.