Texas Instruments SN74LVCH16244AZRDR

Overview

SN74LVCH16244AZRDR from Texas Instruments is a 16-bit noninverting buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features four independent 4-bit sections, each with active-low output-enable (OE) control, 5.5-V-tolerant inputs, bus-hold circuitry, and I_off support for live insertion. It is used in memory address buffering, clock distribution, and bus isolation in 3.3-V systems interfacing with 5-V logic.

For engineers reviewing the SN74LVCH16244AZRDR datasheet, SN74LVCH16244AZRDR pinout, SN74LVCH16244AZRDR application, or SN74LVCH16244AZRDR equivalent, key selection criteria include its 4.1-ns max propagation delay at 3.3 V, ±24-mA output drive capability, 3.6-V-compatible 5.5-V-tolerant inputs, and quad-section 3-state control architecture for flexible bus segmentation.

Technical Context

The SN74LVCH16244AZRDR implements true (noninverting) buffering across 16 channels grouped into four independent 4-bit sections, each controlled by a dedicated active-low OE input. Its CMOS design supports mixed-voltage operation: inputs tolerate up to 5.5 V regardless of V_CC (1.65–3.6 V), enabling level translation from 5-V sources to 3.3-V buses.

It integrates bus-hold circuitry on all data inputs to maintain valid logic states without external resistors, and includes I_off protection that disables outputs and blocks current backflow when V_CC = 0 V-critical for partial-power-down and hot-swap applications. Thermal performance is characterized for TSSOP-48 (DGG) package with R_θJA = 64.3°C/W.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package: 12.50 mm × 6.10 mm body, 0.5-mm pitch, lead-free NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buffer/driver applications.

Compared with SN74LVC16244ADGGR and SN74AVC16244DGGR, the SN74LVCH16244AZRDR uniquely combines bus-hold, I_off, and 5.5-V input tolerance in a single 3.3-V-optimized device-making it the only choice for industrial hot-swap and undefined-input reliability without external components.

Availability

SN74LVCH16244AZRDR is available at Aetrix Electronics and suitable for industrial backplane interfaces, server memory subsystems, and network switch data path isolation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.

Supply support for SN74LVCH16244AZRDR 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 for industrial, automotive, and communications markets.

The SN74LVCH16244AZRDR belongs to TI's Widebus™ family of advanced CMOS buffers, engineered specifically to enhance density and signal integrity in 3.3-V memory address, clock, and bus-oriented applications.

FAQ

What is the maximum operating temperature for SN74LVCH16244AZRDR?

The SN74LVCH16244AZRDR is rated for operation from –40°C to +125°C ambient temperature. This extended industrial temperature range allows reliable deployment in harsh environments such as factory automation controllers, telecom infrastructure, and automotive under-hood modules where thermal management is constrained. The TSSOP-48 package's thermal metrics (R_θJA = 64.3°C/W) support this rating under typical PCB copper pour conditions.

Does SN74LVCH16244AZRDR require external pullup resistors on its inputs?

No, SN74LVCH16244AZRDR does not require external pullup or pulldown resistors on its inputs because it integrates active bus-hold circuitry on all 16 A-inputs. This feature maintains a valid logic state (high or low) on unused or undriven inputs, eliminating floating nodes that could cause increased power consumption, noise susceptibility, or metastability. Using external resistors with bus-hold is explicitly discouraged in the datasheet.

Can SN74LVCH16244AZRDR interface between 5-V and 3.3-V logic domains?

Yes, SN74LVCH16244AZRDR supports mixed-voltage operation: its inputs accept voltages up to 5.5 V regardless of V_CC (1.65–3.6 V), enabling direct connection to 5-V microcontrollers, FPGAs, or legacy peripherals while driving a 3.3-V bus. Outputs swing rail-to-rail within the V_CC range, so level translation occurs inherently on the input side-no external translators are needed for down-translation scenarios.

How is output isolation controlled on SN74LVCH16244AZRDR?

SN74LVCH16244AZRDR provides output isolation via four independent active-low output-enable (OE) inputs: 1OE, 2OE, 3OE, and 4OE. Each OE controls a 4-bit group (e.g., 1OE enables/disables Y1–Y4). When an OE is high, its corresponding Y outputs enter high-impedance (3-state) mode, electrically isolating that segment of the bus. This allows dynamic partitioning-for example, isolating memory address lines during DMA while keeping control signals active.

What package type is used for SN74LVCH16244AZRDR?

SN74LVCH16244AZRDR is packaged in a 48-pin TSSOP (Thin Shrink Small Outline Package), designated DGG per TI's ordering nomenclature. It measures 12.50 mm × 6.10 mm with 0.5-mm lead pitch, features NiPdAu lead finish, and carries JEDEC MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). This RoHS-compliant package balances compact size, thermal performance (R_θJA = 64.3°C/W), and manufacturability for high-volume SMT assembly.