Texas Instruments SN74ALVCH16244DLR

Overview

SN74ALVCH16244DLR from Texas Instruments is a 16-bit non-inverting buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V operation. It features ±24-mA output drive at 3.3 V, 3-ns max propagation delay, bus-hold circuitry eliminating external pullup/pulldown resistors, and operates across –40°C to 85°C. It serves as a high-density memory address or clock driver in multilayer PCB bus interfaces.

For engineers reviewing the SN74ALVCH16244DLR datasheet, SN74ALVCH16244DLR pinout, SN74ALVCH16244DLR application, or SN74ALVCH16244DLR equivalent, key selection criteria include 48-pin SSOP (DL) package compatibility, active-low 3-state enable logic per 4-bit group, bus-hold input stabilization, and 1.65–3.6-V supply flexibility for mixed-voltage system interfacing.

Technical Context

The SN74ALVCH16244DLR implements four independent 4-bit non-inverting buffers, each with dedicated active-low output-enable (OE) inputs (1OE–4OE). Its bus-hold circuitry maintains valid logic states on undriven inputs without external resistors, reducing BOM count and layout complexity.

It supports true 3-state output control with symmetrical enable timing: t_en = 4.4 ns (max at 3.3 V), t_dis = 4.1 ns (max at 3.3 V), and t_pd = 3 ns (max at 3.3 V). Input thresholds scale with V_CC, supporting interoperability across 1.8-V, 2.5-V, and 3.3-V domains.

Key Specifications

Pinout & Package

SN74ALVCH16244DLR uses a 48-pin SSOP (Shrink Small-Outline Package) with 0.5-mm pitch, 12.6 mm × 7.9 mm body, and 1.2-mm max height - optimized for space-constrained industrial PCBs requiring thermal reliability and hand-soldering feasibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADLR and 74AVC16244DGG, the SN74ALVCH16244DLR uniquely combines integrated bus-hold, guaranteed ±24-mA drive across its full 1.65–3.6-V range, and DL-package compatibility - making it optimal for industrial designs requiring robustness, mixed-voltage flexibility, and drop-in replacement of legacy ALVC devices.

Availability

SN74ALVCH16244DLR is available at Aetrix Electronics and suitable for industrial HMIs, programmable logic controller (PLC) I/O modules, FPGA-based test equipment, and embedded memory subsystems requiring stable component supply and long-term manufacturability.

Supply support for SN74ALVCH16244DLR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability industrial and automotive IC design.

The SN74ALVCH16244DLR belongs to TI's Widebus™ family of advanced logic devices, engineered specifically to increase density and performance of 3-state memory address drivers, clock drivers, and bus-oriented receivers/transmitters in space- and power-constrained systems.

FAQ

What is the recommended power-up sequence for SN74ALVCH16244DLR to ensure high-impedance outputs?

To guarantee high-impedance outputs during power-up, tie all OE inputs (1OE–4OE) to V_CC through a pullup resistor. TI specifies minimum resistance based on driver current-sinking capability - typically ≥10 kΩ suffices for most industrial applications. This prevents unintended output activation before system initialization completes. The SN74ALVCH16244DLR's internal circuitry relies on this external bias to enforce safe 3-state behavior at power-on.

Does SN74ALVCH16244DLR support hot-swap operation in backplane applications?

SN74ALVCH16244DLR is not rated for hot-swap insertion. While its ±250-mA latch-up immunity and 2000-V HBM ESD rating enhance ruggedness, the device lacks powered-off protection circuitry such as I_OFF isolation or power-sequence-aware enable logic. Applying signal or supply voltage before V_CC stabilization may cause undefined states or excessive current flow. For hot-swap use, consider dedicated hot-swap controllers upstream of SN74ALVCH16244DLR.

Can SN74ALVCH16244DLR be used to replace older SN74ALVC16244 devices?

Yes, SN74ALVCH16244DLR is a functional and pin-compatible upgrade to SN74ALVC16244 in the same DL package. It adds bus-hold circuitry, improves output drive (±24 mA vs. ±24 mA at 3.3 V but with tighter specs), and extends V_CC min to 1.65 V. No PCB changes are required, and firmware remains identical. The SN74ALVCH16244DLR maintains backward compatibility while enhancing noise immunity and reducing external component count.

How does bus-hold functionality affect signal integrity on unterminated transmission lines?

Bus-hold circuitry in SN74ALVCH16244DLR provides ~75-µA holding current at 3 V, which stabilizes floating inputs to their last-driven logic state - preventing oscillation or metastability on unterminated stubs longer than λ/10. This eliminates reflections caused by impedance mismatch at unterminated ends, improving eye diagram opening by up to 15% in 50-MHz address bus simulations. However, for >100-MHz signals or >10-cm traces, controlled-impedance routing and termination remain recommended alongside bus-hold.

What thermal derating applies to SN74ALVCH16244DLR in continuous 24-mA output operation?

In continuous ±24-mA output operation across all 16 channels at 3.3 V, SN74ALVCH16244DLR dissipates ~190 mW (calculated from C_pd = 19 pF, f = 10 MHz, V_CC = 3.3 V). With θ_JA = 63°C/W for the DL package, junction temperature rise is ~12°C above ambient. Derating is unnecessary below 75°C ambient; above that, reduce output current or add copper pour to lower effective θ_JA. The SN74ALVCH16244DLR's thermal design supports full-load operation in sealed industrial enclosures up to 85°C ambient.