onsemi 74LVTH2244SJ

Overview

74LVTH2244SJ from ON Semiconductor is a low-voltage octal buffer/line driver with 3-STATE outputs and integrated 25Ω series output resistors, designed for memory address and clock bus driving in 3.3V systems interfacing to 5V TTL logic. It features bushold inputs (eliminating external pull-ups), ±12mA drive strength, and operates from 2.7V to 3.6V over –40°C to +85°C.

For engineers reviewing the 74LVTH2244SJ datasheet, pinout, applications, or equivalent options, key selection criteria include bushold input support, 25Ω output series termination, 3-STATE timing (tPZH ≤ 7.7ns), and EIAJ TYPE II SOP-20 (M20D) package compatibility with high-density PCB layouts.

Technical Context

The 74LVTH2244SJ implements dual 4-bit non-inverting buffers with independent 3-STATE enable controls (OE1, OE2), each gating four outputs (O0–O3 and O4–O7). Its bushold circuitry actively maintains input state when floating, enabling robust operation with unused data lines.

Each output integrates a 25Ω series resistor to dampen signal reflections on transmission lines, reducing overshoot/undershoot without requiring external termination. The device uses advanced BiCMOS technology to achieve ABT-class speed (tPLH/tPHL ≤ 5.3ns) while maintaining low ICCZ (0.19mA) in 3-STATE mode.

Key Specifications

Pinout & Package

EIAJ TYPE II 20-Lead Small Outline Package (SOP), 5.3mm wide (Package Code M20D), JEDEC-compliant, lead-free per J-STD-020B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74ALVT244MTCX, the 74LVTH2244SJ uniquely combines bushold inputs, integrated 25Ω termination, and 5V-tolerant operation in a standard SOP-20 package - reducing component count and improving reliability in mixed-voltage bus interfaces without sacrificing timing performance.

Availability

74LVTH2244SJ is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, backplane bus interfaces, and industrial I/O expansion requiring stable component supply and long-term industrial lifecycle support.

Supply support for 74LVTH2244SJ 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

ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The 74LVTH2244SJ belongs to the LVT/LVTH family of low-voltage TTL-compatible logic devices, engineered for high-speed, low-power bus interfacing in mixed-voltage embedded systems where signal integrity and design simplicity are critical.

FAQ

What is the function of bushold inputs in the 74LVTH2244SJ?

The bushold inputs in the 74LVTH2244SJ actively maintain their last valid logic state when left unconnected, eliminating the need for external pull-up or pull-down resistors on unused data lines. This feature improves system reliability in sparse bus configurations and reduces BOM cost. Each bushold input draws ±75µA at switching thresholds, ensuring stable retention without affecting adjacent signal integrity in the 74LVTH2244SJ.

Does the 74LVTH2244SJ support 5V logic inputs while operating at 3.3V supply?

Yes, the 74LVTH2244SJ supports 5V-tolerant inputs - its VI rating extends to 5.5V regardless of VCC, allowing direct connection to 5V TTL signal sources while powered from a 3.3V supply. This eliminates level-shifting circuitry in mixed-voltage systems. Input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) remain valid across the full 2.7–3.6V VCC range, ensuring robust operation of the 74LVTH2244SJ in heterogeneous logic environments.

What is the purpose of the 25Ω series resistors on the 74LVTH2244SJ outputs?

The 25Ω series resistors integrated into each output of the 74LVTH2244SJ provide controlled impedance matching to reduce signal reflections, overshoot, and undershoot on PCB traces longer than ~2cm. This improves signal integrity without requiring discrete termination components. Measured dynamic VOL variation (VOLP/VOLV) remains within ±0.8V under 50pF/500Ω load conditions, confirming effective damping in the 74LVTH2244SJ.

How does the 74LVTH2244SJ handle power-up and power-down sequencing?

The 74LVTH2244SJ features power-up/down high-impedance behavior: outputs remain in 3-STATE during VCC ramp-up or ramp-down, preventing bus contention and glitch generation. This enables safe live insertion/extraction in modular systems. Power-up 3-STATE current (IPU/PD) is limited to ±100µA, ensuring minimal disturbance to shared buses during supply transitions in the 74LVTH2244SJ.

What package type is used for the 74LVTH2244SJ, and is it RoHS compliant?

The 74LVTH2244SJ uses the EIAJ TYPE II 20-Lead Small Outline Package (SOP), 5.3mm wide (Package Code M20D), with gull-wing leads and JEDEC-compliant dimensions. It is lead-free and RoHS compliant per JEDEC J-STD-020B, with matte tin lead finish and reflow profile compatibility up to 260°C peak. This package provides mechanical robustness and thermal performance suitable for automated assembly of the 74LVTH2244SJ.