STMicroelectronics 74VHC16244TTR

Overview

74VHC16244TTR from STMicroelectronics is a 16-bit non-inverting bus buffer with 3-state outputs, designed for high-speed address/data bus driving in mixed-voltage systems. It operates from 2V to 5.5V, delivers 5.4 ns typical propagation delay at 5V, supports ±8 mA symmetrical output drive, and features input overvoltage tolerance up to 7V - enabling safe 5V-to-3V interfacing in memory subsystems.

For engineers reviewing the 74VHC16244TTR datasheet, 74VHC16244TTR pinout, 74VHC16244TTR application, or 74VHC16244TTR equivalent, key selection criteria include 3-state timing (tPZL/tPLZ), latch-up immunity, power-down input protection, ESD robustness (2 kV HBM), and TSSOP-48 package compatibility with legacy 74-series footprint requirements.

Technical Context

The device implements four independent 4-bit non-inverting buffer groups, each controlled by a dedicated active-low output enable (nG) input. All inputs accept 0–7 V regardless of VCC, enabling hot-swap and level-shifting operation without external clamping.

It uses sub-micron C2MOS technology with double-layer metal wiring, delivering balanced tPLH ≈ tPHL propagation delays, low dynamic noise (VOLP ≤ 0.9 V), and symmetrical |IOH| = |IOL| ≥ 8 mA drive strength across the full operating temperature range (–55°C to +125°C).

Key Specifications

Pinout & Package

TSSOP-48 package (4.4 mm × 12.5 mm body, 0.5 mm pitch), thermally enhanced for high-density PCB layouts and compatible with standard 74-series footprint spacing.

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 SN74LVCH16244A and 74ALVC16244, the 74VHC16244TTR uniquely supports 2–5.5 V operation with 7 V input tolerance - making it the only option among the three for true 5 V ↔ 3 V bidirectional interfacing without external circuitry.

Availability

74VHC16244TTR is available at Aetrix Electronics and suitable for memory subsystems, industrial I/O expansion, mixed-voltage bus isolation, and legacy peripheral interface designs requiring stable component supply and long-term lifecycle assurance.

Supply support for 74VHC16244TTR 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 analog/mixed-signal and discrete device portfolios.

The 74VHC series targets high-speed, low-power CMOS logic applications requiring robust noise immunity, wide supply range, and compatibility with legacy TTL/74-series footprints - particularly in industrial control and instrumentation.

FAQ

Can the 74VHC16244TTR safely interface a 3.3 V FPGA to a 5 V EEPROM?

Yes. Its inputs tolerate 0–7 V regardless of VCC, and its outputs swing rail-to-rail within the 3.3 V or 5 V supply used. When powered at 3.3 V, it drives 5 V-tolerant EEPROM inputs directly; when powered at 5 V, it accepts 3.3 V FPGA outputs without level shifting. No external components are needed.

What is the maximum capacitive load this device can drive while maintaining specified timing?

The AC specifications guarantee tPD ≤ 8.0 ns (max) and tPZL ≤ 10.5 ns (max) at CL = 50 pF with RL = 1 kΩ. Driving loads beyond 50 pF increases propagation and enable/disable delays nonlinearly; for >60 pF, derating or buffer staging is recommended to maintain timing closure in high-speed designs.

Does the 74VHC16244TTR support hot insertion when VCC is off?

Yes. Power-down protection ensures all inputs remain high-impedance and non-damaging at 0–7 V even with VCC = 0 V. This allows safe live insertion into backplanes or hot-swap modules where supply sequencing is uncontrolled - a key requirement in modular industrial controllers.

How does the 74VHC16244TTR differ from the older 74HC16244 in practical use?

The 74VHC16244TTR offers significantly improved performance: 5.4 ns tPD (vs. ~11 ns for 74HC), 4 µA ICC (vs. ~40 µA), 28% VCC noise margin (vs. 30% but with tighter distribution), and enhanced latch-up immunity. It also features stricter 7 V input tolerance and better ESD robustness (2 kV vs. 1.5 kV), making it preferable for modern high-density, low-power, and noise-sensitive applications.