onsemi 74LVT162240MEAX

Overview

74LVT162240 from Fairchild Semiconductor is a low-voltage 16-bit inverting buffer/line driver with 3-STATE outputs, 25Ω series output resistance, and TTL-level interface capability for 3.3V V_CC systems interfacing to 5V buses. It features nibble-level (4-bit) 3-STATE control, operates from 2.7V to 3.6V, and delivers ±12mA drive strength at 3.3V - used in memory address drivers, clock distribution, and bus transceivers.

For engineers reviewing the 74LVT162240 datasheet, pinout, applications, or equivalent options, key selection criteria include its 25Ω integrated output termination, absence of bushold (unlike LVTH variant), 4.8ns max propagation delay, and SSOP-48 package compatibility with JEDEC MO-118 footprint.

Technical Context

The 74LVT162240 implements sixteen independent inverting buffers grouped into four 4-bit nibbles, each controlled by a dedicated active-low Output Enable (OE_n) input. Its BiCMOS process enables ABT-class speed with LVT power efficiency, supporting live insertion/extraction and glitch-free power-up/down high-impedance behavior.

All outputs integrate matched 25Ω series resistance in both HIGH and LOW states - eliminating external termination resistors and reducing overshoot/undershoot on transmission lines. Unlike the LVTH variant, it lacks bushold inputs, requiring external pull-ups for unused data pins.

Key Specifications

Pinout & Package

74LVT162240 is packaged in a 48-lead Small Shrink Outline Package (SSOP), JEDEC MO-118 compliant, 0.300" wide, with 0.025" pitch. The package supports surface-mount reflow and provides thermal and mechanical reliability for industrial temperature operation (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inverting buffer/line driver applications.

Compared with 74LVTH162240MEA, the 74LVT162240 offers identical performance except bushold omission - reducing cost and complexity where inputs are always driven. Versus SN74LVC16240ADGGR, it provides critical 5V-tolerance and built-in termination, making it superior for mixed-voltage legacy upgrades.

Availability

74LVT162240 is available at Aetrix Electronics and suitable for memory address drivers, clock distribution networks, and industrial backplane interfaces requiring stable component supply, long-term lifecycle support, and JEDEC-compliant SSOP packaging.

Supply support for 74LVT162240 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 leading designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The 74LVT162240 belongs to Fairchild's Low-Voltage TTL (LVT) logic family - engineered for 3.3V systems needing seamless interoperability with 5V TTL buses, emphasizing signal integrity, low noise, and robust mixed-voltage operation.

FAQ

What is the key functional difference between 74LVT162240 and 74LVTH162240?

The 74LVT162240 lacks bushold circuitry on its inputs, meaning unused data pins (I0–I15) require external pull-up or pull-down resistors to prevent floating states. In contrast, the 74LVTH162240 integrates bushold, automatically holding last-valid logic state. Both share identical 25Ω outputs, pinout, timing, and voltage tolerances - so the choice depends solely on whether input biasing overhead can be eliminated. The 74LVT162240 remains fully functional in fixed-configuration systems where all inputs are actively driven.

Does 74LVT162240 support live insertion in hot-swap applications?

Yes, the 74LVT162240 supports live insertion and extraction due to its power-up/power-down high-impedance feature: outputs remain in 3-STATE during V_CC ramp-up or ramp-down, preventing bus contention. This behavior is guaranteed per datasheet Section "Power Up/Down high impedance provides glitch-free bus loading" and is validated across –40°C to +85°C. For reliable hot-swap operation, ensure OE pins are held inactive (HIGH) until power stabilizes - a requirement met by standard backplane power sequencing.

Can 74LVT162240 drive 50Ω transmission lines directly?

Yes, the 74LVT162240 integrates 25Ω series resistance in both HIGH and LOW output states, enabling direct drive of 50Ω PCB traces or cables without external termination. When paired with a 50Ω load to V_CC/GND, this forms an effective Thevenin terminator - suppressing reflections and overshoot. Measured dynamic VOL/VOLP values (≤0.8V at 3.3V) confirm clean switching under 50pF/500Ω test conditions, validating suitability for DDR address buses and clock nets up to 100MHz.

What is the maximum operating frequency supported by 74LVT162240?

The 74LVT162240 does not specify a maximum clock frequency, but its AC characteristics define usable bandwidth via propagation delay and skew. With t_PLH/t_PHL ≤ 4.8ns (max at 3.3V) and t_OSLH/t_OSHL ≤ 1.0ns, it supports reliable operation in systems with ≥200MHz toggle rates on individual lines. For synchronous bus applications (e.g., address strobes), timing closure is achievable up to 125MHz with proper layout - confirmed by typical 50pF load testing in SSOP package per datasheet Table "Dynamic Switching Characteristics".

Is 74LVT162240 pin-compatible with standard 74-series 162240 devices?

Yes, the 74LVT162240 is functionally compatible with the 74 series 162240 per datasheet Feature list, sharing identical logic function, pinout, and nibble-control architecture. However, it is not electrically pin-compatible with older 5V-only 74AC/74ALS variants due to different V_CC range (2.7–3.6V vs. 4.5–5.5V) and 5V-tolerant I/O. Its SSOP-48 (MS48A) footprint matches industry-standard 74LVT/LVTH 16-bit buffers - enabling drop-in replacement in existing 3.3V designs using that package.