Diodes Incorporated PI74LPT16374AA

Overview

PI74LPT16374AA from Pericom Semiconductor is a 3.3V 16-bit D-type register with 3-state outputs, dual 8-bit or unified 16-bit operation via independent clock and output-enable controls, ±24 mA balanced drive strength, 5V-tolerant inputs/outputs, and industrial temperature range (–40°C to +85°C). It serves as a level-translating data latch in mixed-voltage bus interfaces.

For engineers reviewing the PI74LPT16374AA datasheet, PI74LPT16374AA pinout, PI74LPT16374AA application, or PI74LPT16374AA equivalent, key selection criteria include 5V-tolerant I/O compatibility, low ground bounce, hysteresis-enhanced noise immunity, and TSSOP-48 packaging for high-density PCB layouts.

Technical Context

The PI74LPT16374AA implements two independent 8-bit register banks sharing no internal signal coupling-each bank has dedicated xCLK and xOE controls, enabling asynchronous latching of separate 8-bit data streams. Its 5V-tolerant input structure uses clamped diodes and scaled gate oxides to accept 3.3V or 5V logic levels without external resistors.

Output drivers deliver symmetrical ±24 mA sink/source capability at VCC = 3.3V, with propagation delays as low as 2.0 ns (tPLH/tPHL) and output enable/disable times down to 1.5 ns, supporting high-speed bus hold and data capture in DDR-adjacent timing windows.

Key Specifications

Pinout & Package

PI74LPT16374AA is packaged in a Pb-free, green-compliant 48-pin TSSOP (Package Code A), 240-mil wide, with 0.5 mm pitch, dual-row layout, and distributed VCC/GND pins to minimize simultaneous switching noise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit 3-state register applications.

Compared with SN74LVC16374ADGGR and 74ALVCH16374PAG, PI74LPT16374AA uniquely combines 5V-tolerant I/O, input hysteresis, and 2000V HBM ESD in a single 16-bit register-making it the only option qualified for unbuffered 5V↔3.3V bridging in harsh industrial or automotive contexts without added protection circuitry.

Availability

PI74LPT16374AA is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, telecom line card buffering, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for PI74LPT16374AA 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-performance interface, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The PI74LPT16374AA belongs to Pericom's LPT (Low Power Tolerant) logic family, engineered specifically for voltage-translation and noise-resilient data latching in mixed-signal systems operating across 2.7V–5.5V domains.

FAQ

Can PI74LPT16374AA operate with VCC = 2.7V while maintaining 5V-tolerant inputs?

Yes. The device guarantees 5V-tolerant input operation across the full supply range of 2.7V to 3.6V. Input clamp diodes and internal scaling ensure VIH thresholds remain valid (≥2.0V for I/O pins) even at minimum VCC, enabling reliable interfacing with 5V sources in low-power or brownout conditions.

What is the maximum clock frequency supported for reliable 16-bit data capture?

While not explicitly rated as a maximum frequency, the 2.0 ns minimum propagation delay and 5.0 ns maximum output disable time (tPLZ) support reliable operation up to 100 MHz in well-terminated systems. At 100 MHz, setup/hold margins remain positive given tSU = 2.0 ns and tH = 1.5 ns, assuming controlled trace impedance and <1 ns clock skew.

Does PI74LPT16374AA require external pull-up or pull-down resistors on xOE or xCLK?

No. All inputs feature integrated hysteresis and CMOS-compatible thresholds; xOE and xCLK may be driven directly from FPGA GPIO or microcontroller pins. External resistors are unnecessary unless system-level noise exceeds 150 mV peak-to-peak - in which case board-level shielding is preferred over resistor filtering.

How does the dual-bank architecture affect timing analysis in synchronous designs?

Each bank (1x and 2x) operates independently: tSU/tH apply separately to each xCLK–xDx pair, and tPLH/tPHL are measured per bank. No inter-bank timing constraints exist - allowing 1CLK and 2CLK to run at different frequencies or phases without violating internal timing, simplifying multi-clock domain synchronization.