onsemi 74LVT162240MTDX

Overview

74LVT162240 from Fairchild Semiconductor is a low-voltage 16-bit inverting buffer/line driver with 3-STATE outputs, integrated 25Ω series output resistors, and TTL-compatible I/O for 3.3V V_CC operation. It functions as a memory/address driver or bus transmitter/receiver, supports nibble-level (4-bit) 3-STATE control, and operates across –40°C to +85°C.

For engineers reviewing the 74LVT162240 datasheet, pinout, applications, or equivalent options, key selection criteria include its 25Ω built-in output termination, 3.3V supply with 5V-tolerant inputs, 4.8 ns max propagation delay, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The 74LVT162240 implements sixteen independent inverting buffers, each with active-low 3-STATE output enable (OE1–OE4), enabling four isolated 4-bit groups. Its BiCMOS process delivers ABT-class speed while maintaining low power dissipation at 3.3V.

Each output integrates matched 25Ω series resistance in both HIGH and LOW states-eliminating external termination resistors and reducing overshoot/undershoot on transmission lines. Inputs are TTL-compatible (0–5.5V), but the device lacks bushold; unused inputs require external pull-up/pull-down.

Key Specifications

Pinout & Package

74LVT162240 is packaged in a 48-pin Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch. Pinout follows standard 16-bit buffer layout with dual-row symmetry and dedicated OE control per nibble.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT162240, the 74LVTH162240MTX adds bushold for robust floating-input handling without layout changes, while SN74LVC16240ADGGR supports lower supply voltages but shifts termination responsibility to the PCB designer.

Availability

74LVT162240 is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, and legacy bus interfaces requiring stable component supply, long-term lifecycle support, and consistent TSSOP-48 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 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 74LVT162240 belongs to Fairchild's LVT (Low-Voltage TTL) logic family, designed specifically for high-speed, low-power 3.3V bus interfacing with backward compatibility to 5V systems.

FAQ

What is the function of the OE1–OE4 pins on the 74LVT162240?

The OE1–OE4 pins are active-low output enable controls, each managing a 4-bit nibble (O0–O3, O4–O7, O8–O11, O12–O15). When an OE pin is LOW, its corresponding outputs drive inverted input signals; when HIGH, those outputs enter high-impedance state. This nibble-level control allows partial bus isolation without disabling all 16 lines - a key feature for memory interleaving or dynamic peripheral enable schemes in the 74LVT162240.

Does the 74LVT162240 have bushold inputs?

No, the 74LVT162240 does not include bushold circuitry. Unlike the pin-compatible 74LVTH162240, this variant requires external pull-up or pull-down resistors on unused inputs to prevent floating states and potential noise-induced switching. This distinction is explicitly documented in Fairchild's DS012490 datasheet under "Features" and "DC Electrical Characteristics" notes.

What is the purpose of the 25Ω series resistance in the 74LVT162240 outputs?

The 25Ω series resistance is integrated into each output driver (both HIGH and LOW states) to provide source termination matching typical PCB trace impedances (e.g., 50Ω single-ended). This reduces signal reflections, overshoot, and undershoot - especially critical in memory address or clock distribution networks. The 74LVT162240 leverages this feature to eliminate 16 discrete external resistors, simplifying layout and improving signal integrity without external components.

Can the 74LVT162240 operate with a 5V supply?

No, the 74LVT162240 is rated for V_CC between 2.7 V and 3.6 V only. While its inputs tolerate up to 5.5 V (enabling connection to 5V logic), applying 5V to V_CC exceeds absolute maximum ratings and risks permanent damage. For 5V-supplied systems, use true 5V families like 74ABT or consider level translation - the 74LVT162240 must be powered from 3.3V.

Is the 74LVT162240 pin-compatible with the 74LVTH162240?

Yes, the 74LVT162240 and 74LVTH162240 share identical pinouts, package dimensions, and electrical timing specifications. The only functional difference is the presence of bushold inputs in the LVTH variant. Therefore, the 74LVT162240 can replace the 74LVTH162240 in designs where unused inputs are actively biased - making it a drop-in alternative when bushold is not required.