Texas Instruments SN74AUCH16374ZQLR

Overview

SN74AUCH16374ZQLR from Texas Instruments is a 16-bit edge-triggered D-type flip-flop with 3-state outputs, designed for 1.65–1.95 V operation and 3.6-V I/O tolerant signaling. It features ±8-mA output drive at 1.8 V, 2.8 ns max propagation delay, bus-hold on all data inputs, and Ioff partial-power-down support. It serves as a high-speed register or bidirectional bus driver in low-voltage memory interfaces and FPGA I/O expansion.

For engineers reviewing the SN74AUCH16374ZQLR datasheet, SN74AUCH16374ZQLR pinout, SN74AUCH16374ZQLR application, or SN74AUCH16374ZQLR equivalent, key selection criteria include its 1.8-V optimized timing, VFBGA ZQL package (48-pin, 3.5 mm × 3.5 mm), dual 8-bit configurable operation, and guaranteed 250 MHz clock frequency at 1.8 V.

Technical Context

This device implements two independent 8-bit positive-edge-triggered D-type latches with shared clock and output-enable control per bank. Each bank's eight Q outputs are individually driven and placed into high-impedance state via dedicated OE pins (1OE, 2OE), enabling true bidirectional bus isolation without external components.

Its sub-1-V operability (down to 0.8 V) and 3.6-V I/O tolerance allow mixed-voltage interfacing between 1.2-V, 1.5-V, and 1.8-V logic domains. Bus-hold circuitry eliminates external pullup/pulldown resistors on all 16 D inputs, while Ioff protection prevents backflow current during partial power-down sequences.

Key Specifications

Pinout & Package

VFBGA package (ZQL): 48-pin, 3.5 mm × 3.5 mm, 0.5 mm pitch, bottom-side ball layout with corner pin-1 indicator. RoHS-compliant, NIPDAU finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit D-type flip-flop applications.

Compared with SN74AVC16374DGVR and SN74LVC16374ADGGR, the SN74AUCH16374ZQLR uniquely combines VFBGA miniaturization, bus-hold integration, and Ioff-making it the sole option for compact, ultra-low-power, mixed-voltage register applications requiring zero external bias components.

Availability

SN74AUCH16374ZQLR is available at Aetrix Electronics and suitable for memory interface buffers, FPGA I/O expansion, low-power industrial controllers, and USB-to-parallel bridge interfaces requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74AUCH16374ZQLR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in high-reliability logic and interface solutions.

The SN74AUCH16374ZQLR belongs to TI's Widebus™ family-designed specifically for low-voltage, high-speed digital interfacing in portable, industrial, and communications equipment where size, power, and signal integrity are critical.

FAQ

What is the minimum operating voltage for SN74AUCH16374ZQLR?

The SN74AUCH16374ZQLR operates down to 0.8 V, with guaranteed functionality across the full 0.8–2.7 V VCC range. At 0.8 V, it maintains specified timing (e.g., 7.3 ns tpd) and logic thresholds, enabling use in ultra-low-power subsystems such as energy-harvesting sensors or backup power domains where SN74AUCH16374ZQLR must retain register state below 1.0 V.

Does SN74AUCH16374ZQLR require external pullup resistors on its data inputs?

No. The SN74AUCH16374ZQLR integrates bus-hold circuitry on all 16 D inputs, which actively maintains the last-valid logic state without external components. This eliminates the need for pullup or pulldown resistors-even on unused or intermittently driven inputs-reducing BOM cost and PCB real estate while preventing floating-node noise coupling in the SN74AUCH16374ZQLR design.

Can SN74AUCH16374ZQLR be used in mixed-voltage systems with 3.3-V peripherals?

Yes. The SN74AUCH16374ZQLR features 3.6-V I/O tolerance, allowing its outputs and inputs to safely interface with 3.3-V logic while powered from a 1.8-V supply. This enables direct connection to 3.3-V memory or transceivers without level shifters-provided VI remains within –0.5 V to 3.6 V and VO does not exceed VCC + 0.5 V, as defined in the SN74AUCH16374ZQLR absolute maximum ratings.

What is the thermal performance of the ZQL package in SN74AUCH16374ZQLR?

The SN74AUCH16374ZQLR in the ZQL VFBGA package has a θJA of 42°C/W, significantly lower than TSSOP (70°C/W) or TVSOP (58°C/W) variants. This enables higher sustained clock rates (e.g., continuous 250 MHz operation at TA = 85°C) without derating, making SN74AUCH16374ZQLR ideal for thermally constrained modules like handheld test equipment or dense FPGA carrier boards.

How does the Ioff feature function during power-down in SN74AUCH16374ZQLR?

When VCC = 0 V, the SN74AUCH16374ZQLR's Ioff circuitry disables all I/O terminals, limiting leakage current to ±10 µA maximum-even with 3.3-V signals applied to D or Q pins. This prevents backflow current that could disrupt upstream power supplies or damage other devices, making SN74AUCH16374ZQLR suitable for hot-swap backplanes and dynamically powered subsystems where SN74AUCH16374ZQLR may be unpowered while adjacent ICs remain active.