STMicroelectronics 74VCX16244TTR

Overview

74VCX16244TTR from STMicroelectronics is a low-voltage CMOS 16-bit non-inverting bus buffer with 3-state outputs, designed for voltage-level translation between 1.8V, 2.5V, and 3.3V domains while maintaining 3.6V-tolerant I/O. It features 2.5 ns max propagation delay at 3.0–3.6V, ±24 mA drive strength, and four independent 4-bit output-enable groups. Used in memory address/data bus interfacing and mixed-voltage system backplanes.

For engineers reviewing the 74VCX16244TTR datasheet, 74VCX16244TTR pinout, 74VCX16244TTR application, or 74VCX16244TTR equivalent, key selection criteria include 3.6V I/O tolerance, group-wise 3-state control (four /G inputs), symmetrical drive capability across 1.8–3.6V supply, latch-up immunity >300 mA, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

This device implements sixteen non-inverting buffer channels partitioned into four independent 4-bit sections, each controlled by its own active-low output-enable (/G) input (pins 1, 24, 25, 48). All inputs and outputs tolerate up to 3.6V regardless of VCC (1.8–3.6V), enabling safe interfacing with higher-voltage logic without level shifters.

Each output delivers symmetrical sourcing/sinking current (±24 mA min at VCC = 3.0V), supports dynamic quiet-output specifications (e.g., VOLP ≤ 0.8 V at VCC = 3.3V), and exhibits tight output-to-output skew ≤0.5 ns - critical for timing-critical parallel bus applications such as DDR address latching and FPGA I/O expansion.

Key Specifications

Pinout & Package

TSSOP-48 (Thin Shrink Small Outline Package), 12.6 mm × 8.1 mm body, 0.5 mm pitch, 1.2 mm height - optimized for automated SMT assembly and thermal performance in space-constrained embedded systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit non-inverting 3-state buffer applications.

Compared with SN74LVC16244ADGGR and 74ALVC16244PW,118, the 74VCX16244TTR uniquely guarantees 3.6V I/O tolerance at all supported VCC levels (1.8–3.6V), provides verified dynamic quiet-output behavior, and delivers tighter output skew - making it the only choice for mixed-voltage, high-speed, noise-sensitive parallel bus designs.

Availability

74VCX16244TTR is available at Aetrix Electronics and suitable for memory subsystems, FPGA I/O expansion, industrial backplanes, and low-power embedded controller buses requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74VCX16244TTR 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 strong IP in analog, mixed-signal, and low-power logic technologies.

The VCX logic family targets high-speed, low-voltage, mixed-supply digital interfacing - specifically engineered for seamless voltage translation and noise-resilient operation in next-generation embedded and communications systems.

FAQ

Can 74VCX16244TTR operate with VCC = 2.5V while interfacing with 3.3V signals?

Yes. The device's 3.6V-tolerant inputs and outputs allow direct connection to 3.3V signal sources and loads when powered from 2.5V VCC. Input thresholds scale with VCC (VIH = 0.7×VCC min at 1.8–2.3V), and output drive remains functional at ±18 mA minimum, ensuring reliable logic-level recognition and fanout.

What is the maximum number of outputs that can switch simultaneously without violating VOLP specs?

The datasheet specifies VOLP under conditions where "n−1" outputs switch while one remains LOW (note 1). For worst-case dynamic noise analysis, all 16 outputs may switch simultaneously - the guaranteed VOLP ≤ 0.8 V at VCC = 3.3V applies under this full-load condition, validated per test circuit Figure 7 on page 6.

Does 74VCX16244TTR require external pull-up or pull-down resistors on /G inputs?

No. Each /G input has an internal weak pull-down (typical 100 kΩ) ensuring defined high-impedance state on power-up. External resistors are unnecessary unless specific timing or noise immunity requirements demand faster /G transition control - in which case a 10 kΩ pull-down is sufficient.

How does the latch-up immunity specification apply in practice?

Latch-up immunity >300 mA (per JESD17) means the device withstands transient current injection exceeding 300 mA on any pin without destructive latch-up. This is validated using 100 ns pulses and ensures resilience against EFT bursts (IEC 61000-4-4 Level 4) and accidental shorts in industrial wiring environments.