Texas Instruments 74ALVCH16374ZQLR

Overview

74ALVCH16374ZQLR from Texas Instruments is a 16-bit edge-triggered D-type flip-flop with 3-state outputs, designed for 1.65-V to 3.6-V operation. It features ±24-mA output drive at 3.3 V, 4.2-ns max propagation delay, bus-hold circuitry on data inputs, and dual independent 8-bit sections with separate clock and output-enable controls-ideal for bidirectional bus interfacing in high-speed digital systems.

For engineers reviewing the 74ALVCH16374ZQLR datasheet, 74ALVCH16374ZQLR pinout, 74ALVCH16374ZQLR application, or 74ALVCH16374ZQLR equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), 3-state output timing (enable/disable times ≤4.8 ns), bus-hold functionality eliminating external resistors, and ZQL-package thermal performance (θ_JA = 42°C/W).

Technical Context

This device implements two independent 8-bit positive-edge-triggered D-flip-flop banks, each with dedicated clock (1CLK/2CLK) and output-enable (1OE/2OE) inputs. Data latching occurs synchronously on the rising edge of CLK; OE controls high-impedance state without affecting internal register operation.

Bus-hold circuitry actively maintains valid logic levels on undriven D inputs, eliminating need for external pullup/pulldown resistors. The ZQL package is a Pb-free Very Thin Fine-Pitch Ball Grid Array (VFBGA) with 48 terminals, optimized for low-inductance, high-density PCB layouts in space-constrained applications.

Key Specifications

Pinout & Package

The 74ALVCH16374ZQLR uses a 48-ball VFBGA package (ZQL), 5.5 mm × 6.0 mm, 0.5-mm pitch, with ball grid layout matching JEDEC MO-153. Pin 1 is located in quadrant Q1 per tape-and-reel orientation standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16374DGVR and SN74ALVCH16374DLR, the 74ALVCH16374ZQLR offers the lowest thermal resistance (42°C/W) and smallest PCB footprint (5.5 × 6.0 mm), making it optimal for thermally demanding, space-constrained embedded systems-though it requires fine-pitch BGA assembly capability.

Availability

74ALVCH16374ZQLR is available at Aetrix Electronics and suitable for PCI Express interface buffering, industrial PLC I/O expansion, automotive ADAS sensor hubs, and test equipment digital pattern generation requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for 74ALVCH16374ZQLR 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The ALVCH family delivers advanced low-voltage, high-speed CMOS logic-designed specifically for 1.65–3.6-V mixed-signal systems requiring low power, high noise immunity, and robust bus interfacing capabilities.

FAQ

What is the maximum clock frequency supported by the 74ALVCH16374ZQLR?

The 74ALVCH16374ZQLR supports a maximum clock frequency of 150 MHz across its full operating range (1.65–3.6 V), verified per timing requirements in the SCES021L datasheet. This specification holds at VCC = 3.3 V with 3.3-ns minimum pulse width and accounts for worst-case process/voltage/temperature corners. The 4.2-ns propagation delay directly enables this high-speed operation in synchronous register chains.

Does the 74ALVCH16374ZQLR require external pull-up or pull-down resistors on its data inputs?

No, the 74ALVCH16374ZQLR does not require external pull-up or pull-down resistors on its data inputs because it integrates active bus-hold circuitry on all D pins. This feature maintains valid logic states on unused or undriven inputs, eliminating floating conditions. Using external resistors with enabled bus-hold is explicitly discouraged per TI's datasheet guidance.

How does the ZQL package of the 74ALVCH16374ZQLR compare thermally to other package options?

The ZQL (VFBGA) package of the 74ALVCH16374ZQLR has a thermal impedance (θJA) of 42°C/W, significantly lower than the DL (SSOP, 63°C/W) and DGG (TSSOP, 70°C/W) variants. This 33–40% improvement in thermal performance allows higher sustained power density in compact layouts, making the 74ALVCH16374ZQLR preferable for thermally constrained applications like automotive ECUs or dense FPGA carrier boards.

Can the 74ALVCH16374ZQLR be used as two independent 8-bit registers?

Yes, the 74ALVCH16374ZQLR can be used as two independent 8-bit registers. It contains two fully isolated 8-bit D-type flip-flop sections-labeled Bank 1 (1D1–1Q8) and Bank 2 (2D1–2Q8)-each with dedicated clock (1CLK/2CLK) and output-enable (1OE/2OE) inputs. No internal coupling exists between banks, enabling asynchronous operation, different timing domains, or selective 3-state control per group.

What is the recommended power-up sequence for ensuring high-impedance outputs on the 74ALVCH16374ZQLR?

To ensure outputs remain in high-impedance during power-up or power-down, OE pins (1OE and 2OE) must be tied to VCC via pull-up resistors. TI specifies the minimum resistor value based on the driver's current-sinking capability; for typical microcontroller GPIO drivers, 10-kΩ is sufficient. This prevents unintended logic states or bus contention before system initialization completes.