onsemi 74LVTH16240MTD

Overview

74LVTH16240MTD from Fairchild Semiconductor is a low-voltage 16-bit inverting buffer/line driver with 3-STATE outputs, designed for memory and address bus driving, clock distribution, and TTL-compatible 5V interface applications. It operates at 2.7–3.6 V, delivers ±32 mA/±64 mA output drive, features bushold inputs to eliminate external pull-ups, and supports nibble-level (4-bit) 3-STATE control.

For engineers reviewing the 74LVTH16240MTD datasheet, pinout, applications, or equivalent options, key selection considerations include bushold input capability, 48-pin TSSOP package compatibility, 3.3V supply operation with 5V-tolerant I/O, and precise 3-STATE timing parameters including tPZH ≤ 4.9 ns and tPHZ ≤ 5.2 ns.

Technical Context

The 74LVTH16240MTD implements sixteen independent inverting buffers grouped into four 4-bit nibbles, each with dedicated active-low Output Enable (OEn) control. Its bushold inputs maintain valid logic states on unconnected or floating data lines without external biasing.

Designed in advanced BiCMOS technology, the device achieves high-speed propagation delays (tPLH/tPHL ≤ 4.2 ns at VCC = 2.7 V) while maintaining low power dissipation - ICCZ = 0.19 mA when all outputs are disabled - and robust ESD protection (HBM ≥ 2000 V).

Key Specifications

Pinout & Package

74LVTH16240MTD is housed in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected). Pin numbering follows standard dual-row TSSOP convention, pin 1 marked by dot or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16240ADGGR and 74ALVT16240MTD, the 74LVTH16240MTD uniquely balances bushold convenience, 5V-tolerant interoperability, and moderate power consumption - making it optimal for general-purpose 3.3V-to-5V bus bridging where reliability and design simplicity outweigh extreme speed or minimal footprint.

Availability

74LVTH16240MTD is available at Aetrix Electronics and suitable for memory subsystems, PCI interface modules, clock distribution networks, and industrial backplane designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for 74LVTH16240MTD 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 power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.

The 74LVTH16240MTD belongs to Fairchild's LVT/LVTH family of low-voltage BiCMOS bus-interface devices, engineered specifically for seamless 3.3V-to-5V system interconnection with robust noise immunity and bus-friendly 3-STATE control.

FAQ

What is the bushold feature on the 74LVTH16240MTD and how does it affect system design?

The bushold feature on the 74LVTH16240MTD actively retains the last valid logic state on each of its 16 data inputs when left unconnected, eliminating the need for external pull-up or pull-down resistors. This reduces bill-of-materials cost, saves PCB space, and prevents undefined states during power-up or signal glitches. For the 74LVTH16240MTD, bushold is intrinsic to all I0–I15 pins and requires no configuration - it functions automatically whenever VI is between 0.8 V and 2.0 V.

Can the 74LVTH16240MTD safely interface between a 3.3V FPGA and a 5V TTL memory chip?

Yes, the 74LVTH16240MTD is explicitly designed for this use case: its inputs tolerate up to 5.5 V regardless of VCC, and its outputs drive standard TTL loads at 3.3 V supply. When powered at 3.3 V, the 74LVTH16240MTD delivers 64 mA sink current - sufficient to meet TTL input low-level requirements - and recognizes 2.0 V as a valid HIGH input threshold, ensuring reliable communication across the voltage domain boundary without external level shifters.

How many independent 3-STATE control groups does the 74LVTH16240MTD support, and how are they assigned?

The 74LVTH16240MTD supports four independent 3-STATE control groups, each managing a 4-bit nibble: OE1 controls outputs O0–O3, OE2 controls O4–O7, OE3 controls O8–O11, and OE4 controls O12–O15. Each OE input is active-low, and all sixteen outputs enter high-impedance state when their respective OE is HIGH. Groups may be tied together externally to achieve 8-bit or unified 16-bit control, offering flexible bus segmentation in multi-master or shared-resource systems.

What is the maximum operating temperature range specified for the 74LVTH16240MTD?

According to the official Fairchild datasheet DS012025, the 74LVTH16240MTD is rated for free-air operating temperatures from −40 °C to +85 °C. This industrial-grade temperature range ensures reliable operation in demanding environments such as factory automation controllers, telecom line cards, and embedded computing platforms where ambient conditions exceed commercial limits.

Does the 74LVTH16240MTD require decoupling capacitors, and if so, what value and placement is recommended?

Yes, the 74LVTH16240MTD requires local decoupling: one 0.1 µF ceramic capacitor per VCC–GND pair, placed as close as possible to pins 24 and 48 (the two dedicated VCC pins), and a bulk 4.7 µF tantalum or aluminum electrolytic capacitor near the power entry point of the board. This mitigates simultaneous switching noise from its 16 high-drive outputs and ensures stable 3.3V rail regulation - especially critical given its 64 mA output sink capability and fast edge rates (≤10 ns/V input slew).