Diodes Incorporated PI74LPT16244AA

Overview

PI74LPT16244AA 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 ±24mA balanced drive, supports 3.3V/5V mixed-signal operation with 5V-tolerant inputs and outputs, and operates across –40°C to +85°C for on-board bus and transmission-line driving in memory subsystems.

For engineers reviewing the PI74LPT16244AA datasheet, PI74LPT16244AA pinout, PI74LPT16244AA application, or PI74LPT16244AA equivalent, key selection criteria include 3-state timing (tPZH/tPHZ ≤ 7.0 ns), 5V-tolerant I/O compatibility, low ground bounce, hysteresis-equipped inputs, and TSSOP-48A package thermal and layout constraints.

Technical Context

This device implements four independent 4-bit buffer sections, each with dedicated active-low 3-state enable (xOE) controlling corresponding xYx outputs. Its CMOS design integrates hysteresis on all inputs to suppress noise-induced switching and uses distributed V_CC/GND pins plus multiple center GND pins to minimize simultaneous switching noise.

The PI74LPT16244AA supports mixed-voltage translation: inputs accept 3V or 5V logic levels, and outputs drive 3V loads or interface directly to 5V buses without external level shifters. Propagation delay (t_PLH/t_PHL) is guaranteed ≤5.2 ns at CL = 50 pF, RL = 500 Ω, with output skew ≤0.5 ns between same-package outputs switching synchronously.

Key Specifications

Pinout & Package

Package: 48-pin 240-mil wide thin shrink small-outline package (TSSOP-A), Pb-free and RoHS-compliant, with exposed thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR and 74ALVC16244PW, the PI74LPT16244AA uniquely combines full 5V-tolerant I/O, hysteresis, and tighter 3-state timing (≤7.0 ns), making it the sole option for robust 3.3V-to-5V bidirectional bus translation in electrically noisy industrial memory interfaces.

Availability

PI74LPT16244AA is available at Aetrix Electronics and suitable for DDR SDRAM address buffering, PCI local bus isolation, and FPGA-to-ASIC level translation requiring stable component supply and long-term industrial availability.

Supply support for PI74LPT16244AA 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 (acquired by Diodes Incorporated in 2017) specialized in high-speed interface, timing, and signal-integrity solutions for computing, communications, and industrial electronics.

The PI74LPT16244AA belongs to Pericom's LPT (Low Power TTL-compatible) logic family, engineered specifically for low-noise, high-drive 3.3V bus interfacing in memory and expansion subsystems where ground bounce and EMI must be minimized.

FAQ

Can PI74LPT16244AA operate with a 2.5V supply?

No. The device is specified for V_CC = 2.7V to 3.6V only. At 2.5V, VOH and VOL parameters fall outside guaranteed limits, and output drive degrades below ±16mA. Operation below 2.7V risks logic instability and timing violations per DC Electrical Characteristics table.

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

The PI74LPT16244AA is characterized up to 50 pF load capacitance with guaranteed t_PLH/t_PHL ≤ 5.2 ns. For loads exceeding 50 pF, propagation delay increases linearly (~0.02 ns/pF), and ground bounce may exceed 150 mV above 100 pF-requiring series termination or reduced toggle rate.

How does the hysteresis affect input threshold voltages?

Hysteresis raises the input high threshold (VIH) to ~2.2V and lowers the input low threshold (VIL) to ~0.8V, creating a 1.4V window. This prevents chatter on slowly transitioning or noisy control lines such as OE signals routed near switching power planes or high-speed clocks.

Is thermal pad connection required for normal operation?

No. The TSSOP-A package includes a thermal pad for enhanced heat dissipation, but it is not electrically connected and may be left floating or grounded per PCB layout requirements. No thermal derating is needed below 3.3V/85°C per Power Supply Characteristics data.