Texas Instruments SN74ALVTH16374DLR

Overview

SN74ALVTH16374DLR 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 high-speed bidirectional bus interfacing in mixed-voltage systems. It supports 5-V input tolerance, delivers ±32 mA drive at 3.3 V, and features bus-hold circuitry to eliminate external pullup/pulldown resistors - used in I/O port expansion and buffer register applications.

For engineers reviewing the SN74ALVTH16374DLR datasheet, SN74ALVTH16374DLR pinout, SN74ALVTH16374DLR application, or SN74ALVTH16374DLR equivalent, key selection criteria include its dual 8-bit or unified 16-bit operation mode, 250 MHz max clock frequency at 3.3 V, live-insertion support via power-off output disable, and flow-through pinout for simplified PCB routing.

Technical Context

This device implements two independent 8-bit D-type flip-flop sections, each with separate clock (CLK) and output-enable (OE) controls. It uses Advanced BiCMOS Technology (ABT) to achieve low static power dissipation while maintaining TTL-compatible input thresholds and 5-V tolerant inputs across 2.3–3.6 V VCC.

Its 3-state outputs support auto-3-state behavior when output voltage exceeds VCC + 0.5 V, and internal bus-hold circuitry actively maintains valid logic levels on floating data inputs without external components. Power-up/power-down high-impedance state prevents bus contention during supply sequencing.

Key Specifications

Pinout & Package

SN74ALVTH16374DLR is housed in a 48-pin Shrink Small-Outline Package (SSOP-DL), 0.5 mm pitch, with gull-wing leads and JEDEC MO-153 compliance. The package measures 12.6 mm × 7.9 mm × 1.2 mm (max height) and features distributed VCC/GND pins to minimize switching noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16374DLR and 74LVT16374MTD, SN74ALVTH16374DLR uniquely combines 5-V input tolerance, integrated bus-hold, and 250 MHz operation - making it the sole option among the three for reliable mixed-voltage I/O buffering without external components.

Availability

SN74ALVTH16374DLR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, server memory buffer interfaces, automotive ADAS sensor hubs, and test equipment digital pattern generators requiring stable component supply across extended temperature ranges.

Supply support for SN74ALVTH16374DLR 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.

SN74ALVTH16374DLR belongs to TI's Widebus™ ABT logic family, engineered for high-speed, low-noise, mixed-voltage digital interfacing in industrial, computing, and communications infrastructure.

FAQ

What is the maximum clock frequency supported by SN74ALVTH16374DLR?

SN74ALVTH16374DLR supports a maximum clock frequency of 250 MHz when operated at VCC = 3.3 V ± 0.3 V under recommended conditions with CL = 50 pF. At 2.5 V, the maximum frequency is 150 MHz. These values are specified across the full operating temperature range of –40°C to 85°C and reflect guaranteed performance, not typical-only data.

Does SN74ALVTH16374DLR require external pullup or pulldown resistors on its data inputs?

No, SN74ALVTH16374DLR does not require external pullup or pulldown resistors on its data inputs because it integrates active bus-hold circuitry. This feature maintains a valid logic state on unused or floating inputs, sinking or sourcing ±75 µA at 3 V to hold VI near VIL or VIH thresholds - a key differentiator from non-bus-hold variants like SN74ALVCH16374DLR.

Can SN74ALVTH16374DLR interface directly with 5-V logic systems?

Yes, SN74ALVTH16374DLR supports direct interfacing with 5-V logic systems: its inputs tolerate voltages up to 5.5 V regardless of VCC (2.3–3.6 V), and its outputs provide TTL-compatible VOH/VOL levels. This eliminates level-shifters in mixed-voltage designs - a capability confirmed in the "Mixed-Mode Signal Operation" feature and electrical characteristics tables of the SCES068G datasheet.

What happens to the outputs of SN74ALVTH16374DLR during power-up or power-down?

During power-up or power-down, SN74ALVTH16374DLR outputs enter a high-impedance state when VCC drops below 1.2 V, preventing bus contention. This behavior is intrinsic and does not depend on OE state. For guaranteed high-Z above 1.2 V, TI recommends tying OE to VCC via a pullup resistor - a design requirement explicitly documented in the datasheet's "Description" section.

Is SN74ALVTH16374DLR pin-compatible with other 48-pin SSOP 16-bit flip-flops?

SN74ALVTH16374DLR shares the same 48-pin SSOP (DL) mechanical footprint and pinout as SN74ALVCH16374DLR and SN74LVC16374ADLR, but functional compatibility requires verification of electrical and timing parameters. Its unique bus-hold, 5-V tolerant inputs, and auto-3-state behavior mean that direct substitution may alter system behavior unless those features are accounted for in the target design.