STMicroelectronics 74LVX16240TTR

Overview

74LVX16240TTR from STMicroelectronics is a 16-bit inverting bus buffer with 3-state outputs, designed for voltage-level translation between 5V and 3.3V/3V systems. It features 5V-tolerant inputs, 2V–3.6V operating supply, 5.3 ns typical propagation delay at VCC = 3.3V, ±4 mA output drive, and power-down protection on all I/O pins. It is used in memory address/data bus interfacing and mixed-voltage board-level signal routing.

For engineers reviewing the 74LVX16240TTR datasheet, 74LVX16240TTR pinout, 74LVX16240TTR application, or 74LVX16240TTR equivalent, key selection criteria include 5V input tolerance, symmetrical output drive (|IOH| = IOL ≥ 4 mA), high-impedance state control via four independent enable inputs (1G–4G), and operation across industrial temperature range (−55°C to +125°C).

Technical Context

This device implements eight dual-rail inverting buffers (four groups of four bits each), each controlled by a dedicated active-low output enable (nG). All inputs accept 0–7V regardless of VCC, enabling robust hot-swap and level-shifting capability without external clamping.

It uses sub-micron C2MOS technology with double-layer metal wiring, delivering low noise (VOLP = 0.3 V typ.), balanced tPLH/tPHL delays, and latch-up immunity exceeding JEDEC JESD78 requirements. Input thresholds are fixed at VIH = 2.0 V / VIL = 0.8 V at VCC = 3.0 V - independent of supply variation within operating range.

Key Specifications

Pinout & Package

TSSOP-48 package (4.4 mm × 9.7 mm body, 0.5 mm pitch), thermally enhanced with exposed pad not connected internally. Pin count and layout conform to JEDEC MO-153AC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCH16240A and 74ALVC16240, the 74LVX16240TTR uniquely supports true 5V-to-3V translation without external components and guarantees operation down to 2.0V - critical for brown-out resilience in automotive and industrial power domains.

Availability

74LVX16240TTR is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, automotive ECUs, and PCI/ISA interface designs requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LVX16240TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad IP portfolio.

The LVX logic family targets low-voltage, mixed-signal interfacing applications where 5V compatibility, low power, and wide temperature operation are essential - especially in legacy-system upgrades and harsh-environment electronics.

FAQ

Can the 74LVX16240TTR be operated with VCC = 2.0V while driving 5V-tolerant loads?

Yes. At VCC = 2.0V, VOH is guaranteed ≥1.9V (IO = −50 µA), sufficient to drive 2.0V VIH thresholds of downstream 2.5V/3.3V logic. Its 5V-tolerant inputs remain functional regardless of VCC, allowing it to receive 5V signals while powered at minimum supply - a key feature for brown-out tolerant designs.

What is the maximum number of outputs that can switch simultaneously without violating VOL specification?

Per STMicroelectronics AC characterization (page 6), worst-case simultaneous switching is defined as (n−1) outputs toggling while one remains at GND. With IOL ≥ 4 mA and VOL ≤ 0.55 V at VCC = 3.0V, up to 15 outputs may switch concurrently under 50 pF load without exceeding spec - validated in dynamic switching test condition #2.

Does the 74LVX16240TTR require external pull-up resistors on its output enable (nG) pins?

No. The nG inputs have CMOS-compatible thresholds (VIH = 2.0V, VIL = 0.8V at VCC = 3.0V) and negligible leakage (<1 µA). They may be driven directly from FPGA GPIOs, microcontroller pins, or open-drain logic without pull-ups - provided the driving source meets voltage and current specs.

How does the power-down protection function when VCC is disconnected during system operation?

When VCC = 0 V, all I/O pins enter high-impedance state with diode-clamped inputs accepting −0.5V to 7.0V. This prevents back-powering the supply rail or damaging upstream drivers - verified per Absolute Maximum Ratings (page 3) and confirmed in application note AN2057 for hot-swap scenarios.