Texas Instruments 74ACT16244DLG4

Overview

74ACT16244DLG4 from Texas Instruments is a 16-bit non-inverting buffer/line driver with 3-state outputs, designed for memory address driving, bus interfacing, and clock distribution in high-density digital systems. It operates at 4.5 V to 5.5 V, delivers ±24 mA output drive, supports TTL-compatible inputs, and features symmetrical active-low OE control per 4-bit section. Its flow-through pinout minimizes PCB trace crossings in address/data bus routing.

For engineers reviewing the 74ACT16244DLG4 datasheet, 74ACT16244DLG4 pinout, 74ACT16244DLG4 application, or 74ACT16244DLG4 equivalent, key selection criteria include 3-state bus-driving capability, 8.5 ns max propagation delay (A→Y), 9.5 ns max enable/disable timing, 48-pin SSOP package compatibility, and industrial temperature range (–40°C to 85°C) compliance.

Technical Context

This device implements four independent 4-bit buffer sections, each with true (non-inverting) logic and dedicated active-low output-enable (OE) inputs. Each section drives up to 24 mA high or low while maintaining TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V) and CMOS-level output swing (VOH ≥ 4.94 V at VCC = 5.5 V, VOL ≤ 0.44 V).

It uses TI's EPIC™ 1-µm CMOS process, incorporates distributed VCC/GND pin pairs to suppress switching noise, and achieves 500-mA latch-up immunity at 125°C. The flow-through architecture places inputs on one side and outputs on the opposite side of the 48-pin SSOP package to simplify layer routing in dense PCB layouts.

Key Specifications

Pinout & Package

74ACT16244DLG4 is housed in a 48-pin Shrink Small-Outline Package (SSOP-DL) with 0.5-mm lead pitch, 12.6 mm × 6.2 mm body size, and 1.2 mm max height. Pin 1 is located at top-left corner (Q1 quadrant), with gull-wing leads optimized for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74ACT16244DGGR and SN74LVC16244ADGGR, the 74ACT16244DLG4 uniquely combines 5-V operation, TTL input compatibility, industrial temperature range, and SSOP-DL mechanical stability - making it irreplaceable in legacy 5-V industrial control and memory subsystems where voltage and interface fidelity are non-negotiable.

Availability

74ACT16244DLG4 is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and legacy logic interface applications requiring stable component supply and long-term obsolescence management.

Supply support for 74ACT16244DLG4 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 logic families and industrial-grade IC design.

The 74ACT16244DLG4 belongs to TI's Widebus™ family of high-speed CMOS logic devices, engineered specifically to enhance density and timing performance in memory addressing, bus driving, and clock distribution circuits.

FAQ

What is the maximum operating frequency supported by the 74ACT16244DLG4?

The 74ACT16244DLG4 does not specify a maximum clock frequency directly, but its 8.5 ns maximum propagation delay (A→Y) and 10.3 ns maximum disable time (OE→Y) support reliable operation in 100-MHz bus systems with adequate setup/hold margins. System-level timing must account for trace delays and load capacitance, but the device itself is rated for use in high-speed address and data path applications up to 125 MHz under controlled conditions.

Does the 74ACT16244DLG4 require external pull-up resistors on unused inputs?

Yes - per the datasheet (Note 3), unused inputs on the 74ACT16244DLG4 must be tied to VCC through a pull-up resistor of approximately 5 kΩ or greater to prevent floating states that could cause increased ICC, noise susceptibility, or undefined output behavior. Leaving inputs unconnected risks erratic operation and elevated power consumption due to internal input stage instability.

Is the 74ACT16244DLG4 pin-compatible with the SN54ACT16244WD military-grade variant?

No - the 74ACT16244DLG4 uses a 48-pin SSOP (DL) package, while the SN54ACT16244WD uses a 48-pin ceramic dual flatpack (WD) with different pin spacing (25-mil vs DL's 0.5-mm), land pattern, and thermal/mechanical characteristics. Though both have 48 pins and identical logic functions, they are not physically interchangeable without PCB redesign.

Can the 74ACT16244DLG4 drive a 50-pF capacitive load at full speed?

Yes - the 74ACT16244DLG4 is characterized with CL = 50 pF in its switching specifications (Figure 1), and its 24-mA output drive ensures clean edge transitions into such loads. At VCC = 5 V and TA = 25°C, it maintains tPLH/tPHL ≤ 8.5 ns and tPZH/tPLZ ≤ 9.3 ns under 50-pF loading, confirming suitability for typical PCB trace and IC input capacitance scenarios.

What is the meaning of the 'G4' suffix in 74ACT16244DLG4?

The 'G4' suffix in 74ACT16244DLG4 indicates TI's green packaging standard: lead-free (Pb-free), RoHS-compliant construction with NiPdAu (NIPDAU) terminal finish, and adherence to JEDEC MSL Level-1 moisture sensitivity classification. It confirms the part meets environmental regulations and is qualified for standard reflow soldering without special baking requirements.