Texas Instruments 74ACT16540DL

Overview

74ACT16540DL from Texas Instruments is a 16-bit noninverting buffer/driver with dual 3-state control, designed for high-speed bus interface in wide data paths. It operates at 4.5–5.5 V, delivers ±24 mA output drive, supports −40°C to 85°C industrial temperature range, and features flow-through pinout optimized for PCB layout in memory address/data buffering applications.

For engineers reviewing the 74ACT16540DL datasheet, 74ACT16540DL pinout, 74ACT16540DL application, or 74ACT16540DL equivalent, key selection criteria include TTL-compatible inputs, dual active-low OE control per 8-bit section, 3-state noise suppression, and DL-package thermal/power limits in high-density logic systems.

Technical Context

This device implements two independent 8-bit sections, each with separate active-low output-enable (OE1/OE2) inputs feeding a 2-input AND gate - enabling high-impedance state when either OE is high. The architecture provides inverted data path capability and supports bus-hold-free operation with defined input thresholds (VIH = 2 V, VIL = 0.8 V).

Manufactured in TI's EPIC™ 1-μm CMOS process, it achieves 2.1 ns typical tPLH and 3.9 ns typical tPHL propagation delay at 5 V, with distributed VCC/GND pins minimizing switching noise. Its 500-mA latch-up immunity at 125°C reflects robustness against transient stress in industrial environments.

Key Specifications

Pinout & Package

The 74ACT16540DL is housed in a 48-pin Shrink Small-Outline Package (SSOP), DL drawing, 300-mil body width, 25-mil pin pitch, with exposed thermal pad not electrically connected. Pin numbering follows standard top-view orientation with index mark at Pin 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT16244DL and 74ACT16541DL, the 74ACT16540DL offers optimal balance of coarse-grained (8-bit) bus control and signal polarity fidelity - making it the preferred choice for memory-mapped I/O and address buffering where minimal logic inversion and deterministic section enable are critical.

Availability

74ACT16540DL is available at Aetrix Electronics and suitable for industrial control systems, legacy test equipment upgrades, and memory subsystem design requiring stable component supply and long-term obsolescence management support.

Supply support for 74ACT16540DL 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74ACT16540DL belongs to TI's Widebus™ family of high-speed CMOS logic, engineered specifically for wide-data-path buffering and bus-driving applications in industrial and computing infrastructure where signal integrity and timing predictability are paramount.

FAQ

What is the operating voltage range for the 74ACT16540DL?

The 74ACT16540DL operates over a supply voltage range of 4.5 V to 5.5 V, with recommended nominal operation at 5 V. This range ensures compatibility with standard 5-V TTL and CMOS logic families while maintaining specified timing and drive performance across the full industrial temperature range (−40°C to +85°C). Operation outside this range may result in undefined behavior or reduced reliability.

Does the 74ACT16540DL support true bidirectional data flow?

No, the 74ACT16540DL is a unidirectional noninverting buffer - data flows only from A inputs to Y outputs. It does not contain internal direction control or bus transceiver logic. For bidirectional applications, external control signals and complementary devices (e.g., 74ACT16245) must be used. The 74ACT16540DL's dual OE structure supports controlled one-way isolation, not reversible data transfer.

How many output-enable inputs does the 74ACT16540DL have, and how do they function?

The 74ACT16540DL has four active-low output-enable inputs: 1OE1, 1OE2, 2OE1, and 2OE2 - two per 8-bit section. Each pair feeds an internal AND gate; if either OE in a pair is high, all eight corresponding outputs enter high-impedance state. This architecture enables flexible bus segmentation - for example, using 1OE1/1OE2 to control lower-address bits while 2OE1/2OE2 manage upper-address bits independently.

Is the 74ACT16540DL pin-compatible with the 74ACT16541DL?

Yes, the 74ACT16540DL and 74ACT16541DL share identical pinout, package (DL), electrical specifications, and timing characteristics - differing only in output polarity (noninverting vs. inverting). This makes them direct drop-in replacements where functional inversion is acceptable or compensated elsewhere in the design. No PCB changes are required when substituting one for the other.

What is the maximum allowable junction temperature for continuous operation of the 74ACT16540DL?

The 74ACT16540DL has a maximum junction temperature rating of 150°C, derived from its absolute maximum ratings and thermal design parameters. Under normal operation at TA = 55°C, the DL package supports up to 1.2 W total power dissipation. Sustained operation near the 150°C limit requires careful thermal management - including adequate copper pour, airflow, and derating per JEDEC JESD51 standards - particularly in high-density logic arrays.