onsemi 74LVTH16244MTDX

Overview

74LVTH16244MTDX from Fairchild Semiconductor is a 16-bit non-inverting buffer/line driver with 3-STATE outputs, designed for low-voltage (2.7–3.6 V) bus interfacing and address/data driving in mixed-voltage systems. It features bushold inputs eliminating external pull-ups, 32 mA HIGH-level and 64 mA LOW-level output drive, and nibble-wise 3-STATE control (OE1–OE4) for flexible 4-/8-/16-bit operation.

For engineers reviewing the 74LVTH16244MTDX datasheet, pinout, applications, or equivalent options, key selection considerations include its TTL-compatible 5V input tolerance, live insertion capability, power-up/down high-impedance behavior, and FBGA/SSOP/TSSOP package options - especially the TSSOP-48 variant denoted by suffix 'MTD'.

Technical Context

The 74LVTH16244MTDX implements sixteen independent non-inverting buffers grouped into four 4-bit nibbles, each controlled by a dedicated active-low OE pin (OE1–OE4). Its bushold inputs retain logic state when floating, enabling robust operation in hot-swap and partial-bus-enable scenarios without external biasing.

Designed in advanced BiCMOS technology, it delivers propagation delays as low as 1.2 ns (typical) at 3.3 V with 50 pF load, while maintaining low ICCZ (0.19 mA) in 3-STATE mode. It supports bidirectional voltage translation: 3.3 V VCC supply with 0–5.5 V input tolerance and 3-STATE outputs compatible with 5 V buses.

Key Specifications

Pinout & Package

74LVTH16244MTDX is packaged in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1 mm wide, with exposed pad not electrically connected. Pinout follows standard 16-bit buffer layout with dual-row 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR and 74ALVC16244PW, the 74LVTH16244MTDX uniquely combines bushold, 5 V-tolerant inputs, and live-insertion capability - making it optimal for industrial backplanes and mixed-voltage memory interfaces where reliability under partial connectivity is critical.

Availability

74LVTH16244MTDX is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, PCI-compatible interfaces, and hot-swappable I/O modules requiring stable component supply and long-term obsolescence management.

Supply support for 74LVTH16244MTDX 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

Fairchild Semiconductor was a U.S.-based analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and telecom infrastructure.

The 74LVTH16244MTDX belongs to Fairchild's LVT/LVTH low-voltage BiCMOS logic family, engineered specifically for high-speed, low-noise 3.3 V bus interfacing with backward compatibility to 5 V TTL systems.

FAQ

What does the 'H' in 74LVTH16244MTDX signify?

The 'H' in 74LVTH16244MTDX denotes the bushold feature - a patented input circuit that actively holds the last valid logic state on each of the 16 data inputs when left floating. This eliminates the need for external pull-up or pull-down resistors, simplifying PCB layout and improving reliability in systems with partially populated buses. The 74LVTH16244MTDX is the bushold-enabled version of the base 74LVT16244 series.

Is 74LVTH16244MTDX compatible with 5 V logic inputs?

Yes, the 74LVTH16244MTDX accepts input voltages from 0 V to 5.5 V while operating on a 2.7–3.6 V VCC supply. Its VIH threshold is guaranteed ≥2.0 V and VIL ≤0.8 V at 3.3 V, ensuring reliable recognition of standard 5 V TTL logic levels. This allows direct connection to legacy 5 V microcontrollers, FPGAs, or peripheral devices without level-shifting circuitry.

What is the function of the four OE pins (OE1–OE4) on 74LVTH16244MTDX?

The 74LVTH16244MTDX has four independent active-low output-enable pins (OE1–OE4), each controlling a 4-bit nibble (O0–O3, O4–O7, O8–O11, O12–O15). This architecture enables granular bus segmentation - for example, enabling only address bits A0–A3 during a byte-write cycle while keeping other outputs in high-impedance. OE pins may be tied together for unified 16-bit control if full-width operation is required.

Does 74LVTH16244MTDX support hot-plug or live insertion?

Yes, the 74LVTH16244MTDX is explicitly rated for live insertion/extraction per its datasheet. Its power-up/down high-impedance behavior ensures outputs remain in 3-STATE during VCC ramp-up or ramp-down, and bushold inputs prevent undefined states on floating lines. These features collectively eliminate bus contention and signal glitches when inserting or removing boards in powered-backplane systems such as CompactPCI or custom industrial carriers.

What package type does the 'MTDX' suffix indicate for 74LVTH16244MTDX?

The 'MTDX' suffix identifies the 74LVTH16244MTDX as supplied in tape-and-reel format in the 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1 mm wide. This surface-mount package offers fine pitch (0.5 mm), compact footprint, and thermal performance suitable for high-density PCB layouts. The 'X' denotes tape-and-reel packaging, standard for automated SMT assembly.