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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments 74AC16640DLR

Name: 74AC16640DLR
Brand: Texas Instruments
SKU: 74AC16640DLR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AC16640DLR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: 74AC16640DLR.pdf

Description:: BUS TRANSCEIVER

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Product details

Overview

74AC16640DLR from Texas Instruments is an inverting 16-bit transceiver IC designed for asynchronous bidirectional data bus communication between A and B buses. It supports dual 8-bit or single 16-bit operation, features independent direction-control (1DIR/2DIR) and output-enable (1OE/2OE) inputs, operates from −40°C to 85°C, and uses TI's EPIC 1-µm CMOS process with 500-mA latch-up immunity.

For engineers reviewing the 74AC16640DLR datasheet, 74AC16640DLR pinout, 74AC16640DLR application, or 74AC16640DLR equivalent, key selection criteria include flow-through architecture for PCB layout optimization, distributed V_CC/GND pinning for noise reduction, ±24-mA drive strength at 5 V, and compatibility with 3-V to 5.5-V supply rails in high-density logic interfacing.

Technical Context

The 74AC16640DLR implements two independent 8-bit transceiver sections, each with separate DIR and OE controls enabling flexible bus isolation and directional data flow. Its flow-through pin architecture-where A-side and B-side I/Os align across the package-reduces trace crossovers and improves signal integrity in dense PCB layouts.

Each transceiver section operates with true TTL-compatible input thresholds (V_IL = 1.65 V max, V_IH = 3.85 V min at V_CC = 5.5 V), delivers ±24 mA output drive, and exhibits propagation delays as low as 1.8 ns (t_PLH, V_CC = 5 V). The device is fully specified for 3-V, 4.5-V, and 5.5-V operation with guaranteed AC/DC performance across temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	Advanced CMOS (AC), TTL-compatible input thresholds and output drive
Bus Width	16-bit (configurable as two independent 8-bit transceivers)
Supply Voltage Range	3 V to 5.5 V - supports mixed-voltage system interfacing
Output Drive	±24 mA at V_CC = 5 V - sufficient to drive multiple TTL loads or stub buses
Propagation Delay	1.8 ns min (A↔B, V_CC = 5 V) - enables sub-100-MHz bus timing margins
Operating Temperature	−40°C to +85°C - qualified for industrial-grade embedded systems
Latch-Up Immunity	500 mA typical at 125°C - meets JEDEC JESD78 requirements

Pinout & Package

74AC16640DLR is housed in a 48-pin shrink small-outline (DL) package with 300-mil body width and 25-mil center-to-center pin spacing. This DL package provides double the I/O density of standard SOIC while maintaining compatible footprint area.

Pin/Terminal	Circuit Role	Design Meaning
1DIR, 2DIR	Direction control input (active-high)	Selects data flow direction per section: L = B→A, H = A→B
1OE, 2OE	Output enable input (active-low)	H = high-impedance isolation; L = enabled transceiver operation
1A1–1A8, 2A1–2A8	A-side data I/O terminals	Inverting inputs/outputs tied to local bus A; pin-compatible with standard bus wiring
1B1–1B8, 2B1–2B8	B-side data I/O terminals	Inverting inputs/outputs tied to remote bus B; flow-through alignment minimizes layer transitions
V_CC (pins 7, 18, 28, 39)	Power supply	Distributed V_CC pins reduce simultaneous switching noise and improve PDN stability
GND (pins 4, 10, 15, 21, 31, 42)	Ground reference	Multiple GND pins provide low-inductance return paths and suppress ground bounce

Key Features

Feature	Design Value
Flow-through architecture	Aligns A- and B-side I/Os across package for direct layer-to-layer routing and reduced vias
Distributed V_CC/GND pinning	Eight dedicated power/ground pins minimize switching noise and improve signal integrity
EPIC 1-µm CMOS process	Enables high-speed operation with low static power (8 µA ICC max) and robust latch-up immunity
Independent section control	Two sets of DIR/OE allow asymmetric bus management - e.g., isolate one 8-bit segment while passing another
Wide supply range support	Operates reliably from 3 V to 5.5 V, simplifying integration into mixed-voltage backplanes and legacy systems

Applications

Industrial Backplane Interfacing	Legacy System Bus Extension
Use Scenario: Connecting isolated processor and peripheral modules across a 16-bit parallel backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow between CPU and I/O expansion cards with independent direction control per 8-bit lane. Use Value: Flow-through pinout eliminates cross-layer routing congestion; ±24-mA drive ensures signal integrity over 15-cm backplane traces at 25 MHz.	Use Scenario: Extending a vintage 8086-based S-100 bus to add modern memory-mapped peripherals without redesigning the motherboard. IC Role / Device Role / Timing Role: Inverting transceiver providing controlled, isolated data transfer between legacy bus segments operating at 5 V. Use Value: Independent 1DIR/1OE and 2DIR/2OE enable selective gating of upper/lower byte lanes, preserving timing-critical bus arbitration signals.
Test Equipment Data Acquisition Interface	Modular Instrumentation Chassis
Use Scenario: Interfacing FPGA-based acquisition modules to a central controller in automated test equipment requiring precise bus turnaround timing. IC Role / Device Role / Timing Role: Low-latency (1.8 ns min t_PLH) transceiver synchronizing burst-mode ADC data transfers across isolated voltage domains. Use Value: Fast enable/disable (t_PZL = 3 ns min) allows dynamic bus ownership handoff between modules with no hold-time violations.	Use Scenario: Enabling hot-swappable module communication in a 19-inch rack-mounted instrumentation chassis with shared 16-bit control/data bus. IC Role / Device Role / Timing Role: Isolation-capable transceiver preventing fault propagation between modules during insertion/removal events. Use Value: High latch-up immunity (500 mA) and robust ESD tolerance protect against field-induced transients during live module swaps.

Industrial Backplane Interfacing

Legacy System Bus Extension

Use Scenario: Connecting isolated processor and peripheral modules across a 16-bit parallel backplane in programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow between CPU and I/O expansion cards with independent direction control per 8-bit lane.

Use Value: Flow-through pinout eliminates cross-layer routing congestion; ±24-mA drive ensures signal integrity over 15-cm backplane traces at 25 MHz.

Use Scenario: Extending a vintage 8086-based S-100 bus to add modern memory-mapped peripherals without redesigning the motherboard.

IC Role / Device Role / Timing Role: Inverting transceiver providing controlled, isolated data transfer between legacy bus segments operating at 5 V.

Use Value: Independent 1DIR/1OE and 2DIR/2OE enable selective gating of upper/lower byte lanes, preserving timing-critical bus arbitration signals.

Test Equipment Data Acquisition Interface

Modular Instrumentation Chassis

Use Scenario: Interfacing FPGA-based acquisition modules to a central controller in automated test equipment requiring precise bus turnaround timing.

IC Role / Device Role / Timing Role: Low-latency (1.8 ns min t_PLH) transceiver synchronizing burst-mode ADC data transfers across isolated voltage domains.

Use Value: Fast enable/disable (t_PZL = 3 ns min) allows dynamic bus ownership handoff between modules with no hold-time violations.

Use Scenario: Enabling hot-swappable module communication in a 19-inch rack-mounted instrumentation chassis with shared 16-bit control/data bus.

IC Role / Device Role / Timing Role: Isolation-capable transceiver preventing fault propagation between modules during insertion/removal events.

Use Value: High latch-up immunity (500 mA) and robust ESD tolerance protect against field-induced transients during live module swaps.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ACT16640DLR	Faster propagation (1.5 ns min), higher drive (±24 mA), but higher ICC (20 µA typ vs. 8 µA)	Better suited for >33-MHz bus timing; less optimal for ultra-low-static-power systems	Choose when speed outweighs quiescent current budget
SN74LVC16640ADLR	3.3-V only (1.65–3.6 V), lower drive (±24 mA), smaller 48-pin TSSOP package	Designed for modern low-voltage digital systems; not 5-V tolerant	Choose for new 3.3-V designs where footprint and voltage compliance are primary

Compared with 74AC16640DLR, the 74ACT16640DLR offers tighter timing margins at higher frequencies but increases static power consumption, while the SN74LVC16640ADLR reduces board space and supports newer voltage domains but sacrifices 5-V interoperability and industrial temperature range.

Availability

74AC16640DLR is available at Aetrix Electronics and suitable for industrial backplane interfacing, legacy system bus extension, and modular instrumentation chassis requiring stable component supply across extended product lifecycles.

Supply support for 74AC16640DLR 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74AC16640DLR belongs to TI's Widebus™ family of high-speed bus interface ICs, engineered specifically for noise-resilient, high-density parallel bus interconnection in industrial control and test equipment.

FAQ

What is the maximum operating frequency supported by the 74AC16640DLR?

The 74AC16640DLR does not specify a maximum clock frequency, as it is an asynchronous transceiver. Its usable data rate depends on propagation delay (1.8 ns min at 5 V) and system setup/hold timing. With typical 5-V bus loading, it reliably supports bidirectional data transfers up to 25–33 MHz in well-designed PCB layouts using its flow-through architecture.

Does the 74AC16640DLR support 3.3-V operation?

Yes, the 74AC16640DLR is fully characterized for 3-V operation (V_CC = 3 V to 5.5 V). At 3 V, it delivers ±12 mA output drive and maintains valid TTL-compatible input thresholds (V_IL ≤ 0.9 V, V_IH ≥ 2.1 V), making it suitable for mixed-voltage interfacing between 3.3-V and 5-V subsystems.

How does the flow-through architecture of the 74AC16640DLR improve PCB layout?

The flow-through architecture of the 74AC16640DLR aligns complementary A- and B-side I/O pins (e.g., 1A1 opposite 1B1) across the package, enabling straight trace routing from one bus to the other without layer changes or vias. This reduces parasitic inductance, minimizes crosstalk, and simplifies high-speed layout in dense backplane or motherboard designs.

Can the 74AC16640DLR be used for unidirectional data transfer?

Yes - the 74AC16640DLR supports unidirectional operation via control inputs. Setting 1DIR = L and 1OE = L enables B→A transfer only, while holding 2DIR and 2OE inactive isolates the second section. Each 8-bit section operates independently, allowing mixed unidirectional/bidirectional configurations within the same device.

What is the thermal performance of the 74AC16640DLR in the DL package?

The 74AC16640DLR in the DL package has a maximum power dissipation of 1.2 W at T_A = 55°C in still air. Its EPIC process and distributed power/ground pins contribute to low junction-to-air thermal resistance. Under typical industrial conditions (25°C ambient, moderate bus activity), case temperatures remain below 60°C, supporting reliable long-term operation without forced cooling.

74AC16640DLR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

74AC16640DLR FAQ

1.How can I place an order for 74AC16640DLR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AC16640DLR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74AC16640DLR reliable?

The price and inventory of 74AC16640DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16640DLR is usually 5 days.

3.What payment methods are accepted for 74AC16640DLR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC16640DLR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AC16640DLR?

74AC16640DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AC16640DLR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74AC16640DLR?

For technical support, including 74AC16640DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16640DLR requirements.

6.How does Aetrix verify that 74AC16640DLR is sourced from the original manufacturer or authorized distributors?

All 74AC16640DLR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74AC16640DLR meets industry standards.

7.What is the process for return or replacement of 74AC16640DLR?

All 74AC16640DLR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16640DLR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74AC16640DLR part is unused and in its original packaging.

Return procedure for 74AC16640DLR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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