Texas Instruments SN74LVTH16244AZRDR

Overview

SN74LVTH16244AZRDR from Texas Instruments is a 3.3-V ABT 16-bit noninverting buffer/driver with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V V_CC). It features bus-hold circuitry on all data inputs, I_off support for hot insertion, and operates down to 2.7 V. It is used in backplane interface, memory address buffering, and bus isolation in industrial control systems.

For engineers reviewing the SN74LVTH16244AZRDR datasheet, SN74LVTH16244AZRDR pinout, SN74LVTH16244AZRDR application, or SN74LVTH16244AZRDR equivalent, key selection criteria include 3-state enable timing (t_PZH/t_PLZ ≤ 5.4 ns), bus-hold current (±750 µA), I_off leakage (±100 µA at V_CC = 0), output drive strength (I_OL = 64 mA), and TSSOP-48 package compatibility with 0.5-mm pitch PCB layouts.

Technical Context

The SN74LVTH16244AZRDR implements four independent 4-bit noninverting buffers, each with active-low 3-state output-enable (OE) control. Its Advanced BiCMOS Technology (ABT) enables TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) while operating from a 3.3-V supply, supporting direct interfacing to 5-V logic without level shifters.

Bus-hold circuitry maintains valid logic states on unused inputs without external resistors, and power-up 3-state ensures high-impedance outputs during V_CC ramp (Δt/ΔV_CC ≤ 200 µs/V). The device enters high-Z when V_CC < 1.5 V, but OE must be pulled to V_CC via external resistor above that threshold to guarantee disable.

Key Specifications

Pinout & Package

TSSOP-48 package (DGG), 12.6 mm × 6.2 mm × 1.2 mm body, 0.5-mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit buffer applications.

Compared with SN74LVC16244ADGGR and SN74ALVCH16244DLR, the SN74LVTH16244AZRDR uniquely combines 5-V-tolerant inputs, integrated bus-hold, I_off, and 64-mA drive - making it the only option for robust, translator-free 5-V/3.3-V bus bridging in hot-pluggable industrial systems.

Availability

SN74LVTH16244AZRDR is available at Aetrix Electronics and suitable for industrial control, test equipment, and communications infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVTH16244AZRDR 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 decades of experience in industrial-grade logic and interface solutions.

The SN74LVTH16244AZRDR belongs to TI's Widebus™ ABT family, engineered for mixed-voltage system interfacing, hot-swap reliability, and high-noise-immunity bus driving in demanding industrial and telecom environments.

FAQ

What is the maximum input voltage rating for SN74LVTH16244AZRDR?

The SN74LVTH16244AZRDR supports an input voltage range of –0.5 V to 5.5 V, allowing direct connection to 5-V TTL logic families while operating from a 3.3-V supply. This eliminates the need for external level-shifting circuitry in mixed-voltage systems, and the absolute maximum rating ensures robustness against transient overvoltage events up to 5.5 V on any input pin.

Does SN74LVTH16244AZRDR require external pullup resistors on its inputs?

No, SN74LVTH16244AZRDR does not require external pullup or pulldown resistors on its data inputs because it integrates bus-hold circuitry on all 16 inputs. This internal circuit actively maintains a valid logic state on unused or undriven inputs, with ±750 µA holding current. Using external resistors with the bus-hold function is explicitly discouraged in the datasheet.

Can SN74LVTH16244AZRDR be used in hot-swap applications?

Yes, SN74LVTH16244AZRDR is fully specified for hot-insertion applications. Its I_off circuitry disables outputs and blocks damaging current flow when V_CC = 0, and its power-up 3-state feature ensures outputs remain in high-impedance during power ramp-up/down. These features prevent bus contention and backdrive damage when inserting or removing boards in live backplanes.

What is the recommended minimum pullup resistor value for OE when V_CC > 1.5 V?

When V_CC exceeds 1.5 V, OE should be tied to V_CC through a pullup resistor to guarantee high-impedance output state during power-up. The minimum resistor value depends on the current-sinking capability of the driver controlling OE; TI specifies that the resistor must be sized so the voltage drop across it remains below V_IL (0.8 V) under worst-case sink current, typically resulting in values ≥ 10 kΩ for standard logic drivers.

Which package variants are available for SN74LVTH16244AZRDR?

SN74LVTH16244AZRDR is manufactured exclusively in the TSSOP-48 (DGG) package - a 12.6 mm × 6.2 mm surface-mount outline with 0.5-mm lead pitch and RoHS-compliant NiPdAu plating. Other variants like SN74LVTH16244ADGVR (TVSOP) and SN74LVTH16244ADL (SSOP) exist, but ZRDR suffix denotes the DGG tape-and-reel variant per TI's packaging nomenclature.