Texas Instruments 74ALVCH16344DLRG4

Overview

74ALVCH16344DLRG4 from Texas Instruments is a 1-bit to 4-bit address driver with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features bus-hold circuitry on all data inputs, eliminates need for external pullup/pulldown resistors, supports 56-pin SSOP (DL) package, and delivers ±24 mA output drive at 3 V. It is used to select four separate memory locations using a single address line in high-density memory subsystems.

For engineers reviewing the 74ALVCH16344DLRG4 datasheet, 74ALVCH16344DLRG4 pinout, 74ALVCH16344DLRG4 application, or 74ALVCH16344DLRG4 equivalent, key selection criteria include V_CC operating range (1.65–3.6 V), bus-hold input retention, 3-state enable timing (t_en = 5.1 ns max at 2.7 V), output skew control (t_sk(o) ≤ 0.5 ns), and SSOP-56 thermal performance (θ_JA = 56°C/W).

Technical Context

This device implements eight independent 1-bit-to-4-bit address translation banks, each with dedicated output-enable (OE1–OE4) and input (A1–A8) terminals. Each bank drives four B outputs (e.g., 1B1–1B4) from one A input, with simultaneous 3-state control per bank via its OE signal.

Bus-hold circuitry actively maintains valid logic states on undriven inputs without external components, with hold current ±75 µA at 3 V. Output switching is characterized across V_CC = 1.8 V, 2.5 V, and 3.3 V, with propagation delay t_pd = 4.6 ns (typ) at 2.5 V and 3.3 V, and output disable time t_dis = 4.4 ns (max) at 2.7 V.

Key Specifications

Pinout & Package

The 74ALVCH16344DLRG4 uses a 56-pin Plastic Small-Outline Package (SSOP-DL), 12.6 mm × 6.2 mm body size, 0.5-mm lead pitch, JEDEC MO-118 compliant, with gull-wing leads and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar address driver applications.

Compared with SN74ALVCH16344DGGR, the 74ALVCH16344DLRG4 offers superior thermal dissipation (56 vs. 64°C/W) in SSOP form, while 74ALVCH16344DLG4 provides identical performance in tube format-making DLRG4 optimal for volume production requiring tape-and-reel automation and thermal headroom.

Availability

74ALVCH16344DLRG4 is available at Aetrix Electronics and suitable for memory expansion modules, industrial PLC backplanes, network packet buffer systems, medical imaging frame stores, and high-reliability embedded computing requiring stable component supply and long-term lifecycle support.

Supply support for 74ALVCH16344DLRG4 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74ALVCH16344DLRG4 belongs to TI's Widebus™ family of advanced CMOS logic devices, engineered specifically for high-speed, low-voltage address and data bus interface applications in memory-intensive systems.

FAQ

What is the recommended power-up sequence for the 74ALVCH16344DLRG4 to ensure reliable 3-state behavior?

TI specifies that OE should be tied to V_CC through a pullup resistor during power-up or power-down to guarantee high-impedance outputs. For the 74ALVCH16344DLRG4, the minimum resistor value depends on the driver's current-sinking capability-typically 10 kΩ suffices. This prevents bus contention before system initialization completes, and applies identically across all eight banks of the 74ALVCH16344DLRG4.

Does the 74ALVCH16344DLRG4 support mixed-voltage operation between input and output sides?

No-the 74ALVCH16344DLRG4 does not support true mixed-voltage I/O. All inputs and outputs operate referenced to the same V_CC rail (1.65–3.6 V). Input thresholds scale with V_CC (e.g., VIH = 0.65×V_CC at 1.65 V), and outputs swing rail-to-rail. Level translation requires external circuitry; the 74ALVCH16344DLRG4 itself functions only as a single-supply address driver.

How does bus-hold functionality behave when an input is actively driven versus floating on the 74ALVCH16344DLRG4?

When an input to the 74ALVCH16344DLRG4 is actively driven (VI < 0.35×V_CC or VI > 0.65×V_CC), bus-hold is overridden and the input follows the applied signal. When floating, bus-hold asserts ±75 µA (at 3 V) to retain the last-valid logic state. TI explicitly warns against combining bus-hold with external pull resistors, as they conflict and may cause excessive current draw or metastability in the 74ALVCH16344DLRG4.

Can the 74ALVCH16344DLRG4 be used to drive termination resistors on a memory address bus?

Yes-the 74ALVCH16344DLRG4 can directly drive standard 50-Ω or 60-Ω parallel terminations typical in high-speed memory buses. With ±24 mA output drive at 3 V, it meets the current requirements for driving unterminated stubs or lightly loaded lines. However, for heavily loaded or long traces, verify voltage margins using VOL/VOH specs at worst-case V_CC and temperature, as the 74ALVCH16344DLRG4's output impedance is not regulated.

What is the maximum clock frequency supported by the 74ALVCH16344DLRG4 in address strobe applications?

The 74ALVCH16344DLRG4 does not contain an internal clock but supports address strobe rates up to ~100 MHz, derived from its 4.6 ns typical propagation delay (t_pd) and 4.4 ns max disable time (t_dis). At 3.3 V, setup/hold and skew parameters allow reliable operation with 10 ns minimum pulse widths. System-level timing must account for PCB trace delays and load capacitance, as the 74ALVCH16344DLRG4 itself imposes no hard clock limit.