Texas Instruments SN74ALVCH16344DL

Overview

SN74ALVCH16344DL from Texas Instruments is a 16-bit universal bus driver with 3-state outputs, designed for bidirectional data flow control in SDRAM buffered DIMM systems. It operates from 1.65 V to 3.6 V, supports latch/transparent modes via LE and CLK inputs, and features bus-hold circuitry eliminating external pullup/pulldown resistors - enabling robust signal integrity in memory subsystems.

For engineers reviewing the SN74ALVCH16344DL datasheet, SN74ALVCH16344DL pinout, SN74ALVCH16344DL application, or SN74ALVCH16344DL equivalent, key selection criteria include VCC range compatibility (1.65–3.6 V), 3-state output timing (ten ≤ 5.4 ns at 3.3 V), latch-enable behavior, bus-hold input stabilization, and DL-package thermal performance (θJA = 94°C/W).

Technical Context

This device implements dual-mode operation: transparent mode when LE is low (A→Y path enabled), and edge-triggered latching when LE is high and CLK transitions low-to-high. The 16-bit A/Y port pair supports independent direction control per channel via OE, with all outputs placed in high-impedance state when OE is high.

It integrates EPIC™ submicron CMOS process technology, complies with JEDEC 168-pin and 200-pin SDRAM buffered DIMM specifications, and provides ESD protection exceeding 2000 V (HBM) and latch-up immunity >250 mA per JESD 17 - confirming suitability for high-density memory module interconnects.

Key Specifications

Pinout & Package

SN74ALVCH16344DL uses a 48-pin Shrink Small-Outline Package (SSOP-DL), 15.9 mm × 7.5 mm body size, 0.5 mm lead pitch, moisture sensitivity level 1 (260°C peak reflow), and NIPDAU lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16344DL, SN74ALVCH16334DL offers identical functionality and drop-in compatibility, while 74ALVCH16344DGGR trades package size and thermal resistance for stricter placement accuracy - making SN74ALVCH16344DL optimal for established DIMM designs prioritizing manufacturing yield and thermal headroom.

Availability

SN74ALVCH16344DL is available at Aetrix Electronics and suitable for DDR SDRAM buffered DIMM modules, industrial memory subsystems, and FPGA-to-SDRAM interface designs requiring stable component supply, long-term lifecycle support, and JEDEC-compliant timing performance.

Supply support for SN74ALVCH16344DL 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 over 50 years of innovation in high-reliability interface and memory support ICs.

The SN74ALVCH16344DL belongs to TI's Widebus™ family - engineered specifically for high-speed, low-voltage memory module buffering and registered DIMM applications demanding precise timing, bus stability, and JEDEC compliance.

FAQ

What is the recommended power-up sequence for SN74ALVCH16344DL?

TI recommends tying OE to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp. VCC should stabilize before applying signals to CLK, LE, or A inputs. This prevents bus contention and undefined latch states in the SN74ALVCH16344DL during initialization.

Does SN74ALVCH16344DL support both latch and transparent modes simultaneously?

No. The SN74ALVCH16344DL operates in one mode at a time: when LE is low, it functions in transparent mode (A→Y path active); when LE is high, it enters latch mode and samples A inputs only on the low-to-high CLK transition. These modes are mutually exclusive and controlled solely by the LE signal level.

Can SN74ALVCH16344DL drive 50-pF loads at 150 MHz?

Yes. The SN74ALVCH16344DL is characterized for fclock = 150 MHz at VCC = 2.7 V and 3.3 V, with tpd ≤ 4.5 ns and Cpd = 37 pF (outputs enabled). Its ±24 mA drive strength at 3 V ensures clean signal edges into 50-pF loads, satisfying DDR timing budgets when used in registered DIMM clock distribution paths.

How does bus-hold functionality work on SN74ALVCH16344DL inputs?

The SN74ALVCH16344DL integrates active bus-hold circuitry on all 16 A-inputs, providing ±75 µA holding current at 3 V. This maintains the last-valid logic state on floating or unterminated inputs - preventing metastability and eliminating external 10-kΩ pull resistors typically required in memory module designs using the SN74ALVCH16344DL.

Is SN74ALVCH16344DL pin-compatible with older 74-series bus drivers?

No. SN74ALVCH16344DL uses a 48-pin DL package with dedicated CLK, LE, and OE controls - differing from legacy 24-pin or 28-pin 74-series drivers. It is functionally and physically compatible only with SN74ALVCH16334DL (same pinout and specs), not with generic 74AC/74HC variants due to architecture and timing differences.