Texas Instruments SN74ALVTH16374KR

Overview

SN74ALVTH16374KR from Texas Instruments is a 2.5-V/3.3-V 16-bit edge-triggered D-type flip-flop with 3-state outputs, designed for bidirectional bus interfacing in mixed-voltage systems. It features dual 8-bit sections, bus-hold on all data inputs, auto-3-state output disable above VCC + 0.5 V, and operates from –40°C to 85°C. Used in high-speed I/O port buffering and TTL-to-3.3-V level translation.

For engineers reviewing the SN74ALVTH16374KR datasheet, SN74ALVTH16374KR pinout, SN74ALVTH16374KR application, or SN74ALVTH16374KR equivalent, key selection considerations include its 3.3-V/2.5-V dual-supply compatibility, ±32 mA output drive at 3.3 V, 250 MHz max clock frequency, bus-hold input retention, and power-off high-impedance outputs enabling live insertion.

Technical Context

This device implements two independent 8-bit positive-edge-triggered D-type flip-flop banks, each with dedicated clock (CLK) and output-enable (OE) controls. Internal bus-hold circuitry eliminates external pullup/pulldown resistors on all 16 data inputs, maintaining valid logic states during floating conditions.

Its ABT (Advanced BiCMOS Technology) Widebus™ architecture supports mixed-mode signaling: 5-V-tolerant inputs and outputs while operating at 2.3–3.6 V VCC. Distributed VCC/GND pins and flow-through pinout minimize switching noise and simplify PCB routing for high-density bus applications.

Key Specifications

Pinout & Package

SN74ALVTH16374KR is packaged in a 48-pin TSSOP (DGG) with 0.5-mm pitch, 12.6 mm × 6.2 mm body, and 1.2 mm max height. Pin numbering follows standard JEDEC MO-153 layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit registered bus interface applications.

Compared with SN74ALVCH16374DGGR and SN74LVC16374ADGGR, SN74ALVTH16374KR provides unique 5-V-tolerant I/O, integrated bus-hold, and auto-3-state - critical for mixed-voltage industrial and automotive bus bridging where component count reduction and robustness are prioritized over minimal BOM cost.

Availability

SN74ALVTH16374KR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, server memory buffering, automotive body control units, and test equipment digital I/O cards requiring stable component supply and long-term lifecycle support.

Supply support for SN74ALVTH16374KR 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 company specializing in analog and embedded processing technologies, with leadership in interface, logic, and power management ICs.

The SN74ALVTH16374KR belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for high-speed, mixed-voltage digital system interconnect in industrial, computing, and automotive applications.

FAQ

What voltage levels can SN74ALVTH16374KR tolerate on its inputs when operating at 3.3 V VCC?

SN74ALVTH16374KR supports 5-V-tolerant inputs - it accepts VI up to 5.5 V while operating at VCC = 3.3 V, enabling direct interfacing with legacy 5-V TTL logic without external level shifters. This capability is explicitly specified in the Recommended Operating Conditions table under "VI Input voltage" with a 0 to 5.5 V range.

Does SN74ALVTH16374KR require external pullup or pulldown resistors on its data inputs?

No, SN74ALVTH16374KR does not require external pullup or pulldown resistors because it integrates active bus-hold circuitry on all 16 data inputs. This feature maintains valid logic states on floating inputs, with IBHL = ±75 µA at VCC = 3 V, eliminating board space and BOM cost associated with discrete biasing components.

How does the auto-3-state function work in SN74ALVTH16374KR?

The auto-3-state function in SN74ALVTH16374KR automatically places outputs in high-impedance when VO exceeds VCC + 0.5 V. This occurs independently of OE control and prevents bus contention during overvoltage events or hot-swap operations. The feature is confirmed in the Features list and Electrical Characteristics section under IEX parameter (current into output when VO > VCC).

What is the maximum clock frequency supported by SN74ALVTH16374KR at 3.3 V?

At VCC = 3.3 V ± 0.3 V, SN74ALVTH16374KR supports a maximum clock frequency of 250 MHz, as specified in the Timing Requirements table. This value is validated under recommended operating conditions with CL = 50 pF load and applies to both 8-bit sections operating independently or jointly.

Is SN74ALVTH16374KR suitable for hot-swap applications?

Yes, SN74ALVTH16374KR is designed for hot-swap applications: its outputs enter high-impedance during power-up and power-down (VCC ≤ 1.2 V), and power-off disables outputs entirely. These behaviors - documented in the Features and Electrical Characteristics sections - prevent bus conflicts when inserting or removing boards in live backplane systems.