Texas Instruments SN74ABTH16244DLR

Overview

SN74ABTH16244DLR from Texas Instruments is a 16-bit noninverting 3-state buffer/driver IC designed for high-density bus interfacing in memory address, clock distribution, and data bus systems. It delivers ±32-mA high-drive outputs, features bus-hold on all data inputs to eliminate external pull resistors, and operates across –40°C to 85°C with 4.5-V to 5.5-V supply voltage.

For engineers reviewing the SN74ABTH16244DLR datasheet, SN74ABTH16244DLR pinout, SN74ABTH16244DLR application, or SN74ABTH16244DLR equivalent, key selection criteria include its 48-pin SSOP (DL) package, true-output logic architecture, OE-controlled 3-state operation, and compatibility with Widebus™-optimized PCB layouts requiring flow-through signal routing and distributed power/ground pins.

Technical Context

This device implements four independent 4-bit buffer sections, each with symmetrical active-low output-enable (OE) control and true (noninverting) output logic. Its EPIC-II^B BiCMOS process enables low power dissipation while sustaining high-speed switching with <1 V typical output ground bounce (VOLP) at 5 V and 25°C.

The architecture integrates bus-hold circuitry on all 16 A-inputs, eliminating floating-input risk without external components, and uses distributed V_CC/GND pin placement to minimize simultaneous switching noise-critical for stable operation in dense 32-bit or wider parallel bus environments.

Key Specifications

Pinout & Package

SN74ABTH16244DLR is housed in a 48-pin Shrink Small-Outline Package (SSOP, DL), 12.6 mm × 6.2 mm × 1.2 mm body, with 0.5-mm lead pitch and gull-wing terminations. The package is RoHS-compliant, moisture-sensitivity Level-1 rated, and optimized for automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit 3-state buffer applications.

Compared with SN74LVC16244ADGGR, SN74ABTH16244DLR supports legacy 5-V systems and eliminates BOM overhead via integrated bus-hold; versus SN74ABT16244DGGR, it offers lower thermal resistance (63 vs. 70°C/W) in the DL package, enabling higher sustained drive in thermally constrained enclosures.

Availability

SN74ABTH16244DLR is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and embedded data acquisition platforms requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABTH16244DLR 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 decades of heritage in high-reliability logic families.

The SN74ABTH16244DLR belongs to TI's Widebus™ family of high-speed, high-drive bus interface ICs, engineered specifically for memory addressing, clock fanout, and parallel bus isolation in industrial and computing infrastructure.

FAQ

What is the recommended power-up sequence for SN74ABTH16244DLR to avoid bus contention?

TI specifies that OE inputs must be held high (via pullup resistor to V_CC) during power-up and power-down to guarantee outputs remain in high-impedance state. For SN74ABTH16244DLR, use a ≤10-kΩ resistor tied to V_CC; this ensures all 16 outputs stay tri-stated until firmware asserts OE low. Failure to do so may cause short-duration bus conflicts during rail stabilization.

Does SN74ABTH16244DLR support hot insertion or live insertion into a powered-backplane system?

No-SN74ABTH16244DLR is not hot-plug rated. Its absolute maximum ratings allow V_CC = –0.5 V to 7 V and input voltage up to 7 V, but the device lacks I_off protection or power-sequence immunity. Applying signals before V_CC is stable risks latch-up or excessive current through internal clamps. Always power V_CC before applying inputs to SN74ABTH16244DLR.

Can SN74ABTH16244DLR be used as a level translator between 3.3-V and 5-V logic domains?

SN74ABTH16244DLR accepts 3.3-V CMOS/TTL inputs reliably (V_IL = 0.8 V, V_IH = 2.0 V), but its outputs swing rail-to-rail at 5 V and are not 3.3-V tolerant. To drive 3.3-V receivers, add series 100-Ω resistors and verify VIH/VIL margins at the destination. SN74ABTH16244DLR itself does not provide bidirectional level translation.

How does the bus-hold feature behave on SN74ABTH16244DLR when an input is driven externally?

The bus-hold circuit in SN74ABTH16244DLR acts as a weak keeper (±40 µA at V_CC = 4.5 V) and is automatically overridden when an external driver applies >±100 µA-well within standard TTL/CMOS output capability. So when actively driven, SN74ABTH16244DLR behaves as a standard buffer; bus-hold only engages during float or high-impedance source conditions.

What is the maximum capacitive load SN74ABTH16244DLR can drive while maintaining specified tPLH/tPHL?

TI characterizes SN74ABTH16244DLR switching performance at C_L = 50 pF, with tPLH/tPHL ranging from 0.7 ns to 4.2 ns. At 100 pF, propagation delay increases ~25%, and output rise/fall times degrade measurably. For designs exceeding 50 pF, verify timing margins using actual board parasitics-and consider adding series termination to damp ringing without increasing delay.