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Texas Instruments 74ACT16652DL

Name: 74ACT16652DL
Brand: Texas Instruments
SKU: 74ACT16652DL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ACT16652DL

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 56-BSSOP (0.295", 7.50mm Width)

Datasheet:: 74ACT16652DL.pdf

Description:: IC TXRX NON-INVERT 5.5V 56SSOP

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Product details

Overview

74ACT16652DL from Texas Instruments is a 16-bit bus transceiver with dual 8-bit registers, 3-state outputs, TTL-voltage-compatible inputs, and real-time/stored-data multiplexing capability. It operates from –40°C to 85°C at 4.5–5.5 V, delivers ±24 mA output drive, and supports up to 90 MHz clock frequency - used in high-speed bidirectional data routing between microprocessor buses and peripheral subsystems.

For engineers reviewing the 74ACT16652DL datasheet, 74ACT16652DL pinout, 74ACT16652DL application, or 74ACT16652DL equivalent, key selection considerations include its flow-through vs. registered transfer modes, independent OE/S/CLK controls per A/B bus, distributed V_CC/GND pinning for noise reduction, and SSOP-56 package compatibility with dense PCB layouts.

Technical Context

The 74ACT16652DL implements two independent 8-bit D-type flip-flop register banks (A and B), each with dedicated clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) inputs. Its multiplexed architecture allows concurrent real-time pass-through or registered latching without decoding glitches during mode transitions.

It uses TI's EPIC 1-µm CMOS process, features TTL-level input thresholds (V_IL = 0.8 V, V_VIH = 2 V), guarantees 3.8 V VOH at –24 mA (V_CC = 4.5 V), and achieves t_PLH/t_PHL ≤ 10.5 ns for bus-to-bus transfers - enabling deterministic timing in synchronous bus arbitration and memory-mapped I/O systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS logic domains.
Operating Temperature	–40°C to +85°C - qualified for industrial-grade embedded control and data acquisition systems.
Output Drive	±24 mA - sufficient to directly drive multiple 5-V CMOS/TTL loads without external buffers.
Max Clock Frequency	90 MHz - supports high-throughput data handshaking in real-time bus interfaces.
Propagation Delay	t_PLH/t_PHL ≤ 10.5 ns (A↔B) - enables sub-11-ns latency for critical bus arbitration paths.
Input Compatibility	TTL-voltage levels (V_IL ≤ 0.8 V, V_VIH ≥ 2 V) - interoperable with legacy 5-V microcontrollers and peripherals.
Power Dissipation Cap.	C_pd = 13 pF (outputs disabled) - minimizes dynamic power in standby bus isolation mode.

Pinout & Package

74ACT16652DL is housed in a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 25-mil pin pitch, with distributed V_CC and GND pins to suppress simultaneous switching noise.

Pin/Terminal	Circuit Role	Design Meaning
1OEAB, 2OEAB, 1OEBA, 2OEBA	Output Enable (active-low)	Individually gate A→B or B→A 3-state outputs; enables bidirectional bus isolation per channel pair.
1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA	Register Clock (rising-edge)	Latches A or B bus data into internal D-flip-flops on positive clock transition - independent of OE/S states.
1SAB, 2SAB, 1SBA, 2SBA	Select Control (high = stored data)	Glitch-free multiplexer control: low = real-time pass-through, high = registered output - no decode hazard during transitions.
1A1–1A8, 2A1–2A8, 1B1–1B8, 2B1–2B8	Bidirectional Data I/O	Two independent 8-bit A and B buses; each pin functions as input or 3-state output depending on OE and direction control.
V_CC (pins 7, 20, 32, 45)	Power Supply	Distributed V_CC pins reduce IR drop and high-frequency impedance across the die - critical for clean signal integrity at 90 MHz.
GND (pins 4, 11, 27, 39, 53)	Ground Reference	Five GND pins symmetrically placed to minimize ground bounce and improve EMI performance in fast-switching operation.

Key Features

Feature	Design Value
Real-time + stored data multiplexing	Eliminates decoding glitches during SAB/SBA transitions - ensures deterministic bus state during mode changes.
Independent A/B register enables	Allows asymmetric operation: e.g., store A data while holding B data, or vice versa - essential for pipeline staging.
Distributed V_CC/GND pinning	Reduces high-speed switching noise by lowering inductive loop area - verified via 500-mA latch-up immunity at 125°C.
Flow-through architecture	Enables direct bus coupling without clocking when OEAB/OEBA are active - supports transparent data mirroring for bus buffering.
TTL-input compatible interface	Accepts standard 5-V TTL logic levels without level-shifting - simplifies integration with legacy microprocessor buses.

Applications

Microprocessor Bus Interface	Memory-Mapped I/O Expansion
Use Scenario: Bidirectional data transfer between a 16-bit microprocessor data bus and peripheral ASICs or FPGAs. IC Role / Device Role / Timing Role: Acts as a programmable bus transceiver with register staging - isolates CPU from peripheral timing skew while supporting burst reads/writes. Use Value: Enables synchronous handshaking at up to 90 MHz with sub-11-ns propagation delay, reducing bus turnaround overhead in real-time control loops.	Use Scenario: Extending address/data bus width for add-on I/O modules in industrial PLC backplanes. IC Role / Device Role / Timing Role: Provides registered latching of control/status signals between master controller and remote I/O cards - decouples timing domains. Use Value: Independent SAB/SBA and CLKAB/CLKBA controls allow staggered loading of A/B registers, preventing metastability in multi-drop bus topologies.
Dual-Port Memory Arbitration	Legacy System Bus Bridging
Use Scenario: Managing concurrent access to shared SRAM between DSP and host processor in audio/video processing systems. IC Role / Device Role / Timing Role: Functions as a dual-ported register buffer - stores DSP writes while allowing host reads from previous cycle's data. Use Value: Real-time/stored mode selection permits zero-wait-state read-after-write cycles, improving effective memory bandwidth by eliminating interlock stalls.	Use Scenario: Interfacing modern 5-V CPLD-based glue logic to aging 16-bit ISA or VMEbus systems. IC Role / Device Role / Timing Role: Translates between asynchronous legacy bus strobes and synchronous FPGA control logic - absorbs timing skews via register staging. Use Value: TTL-compatible inputs and ±24 mA drive ensure robust signal integrity across long backplane traces, meeting VME spec setup/hold margins.

Microprocessor Bus Interface

Memory-Mapped I/O Expansion

Use Scenario: Bidirectional data transfer between a 16-bit microprocessor data bus and peripheral ASICs or FPGAs.

IC Role / Device Role / Timing Role: Acts as a programmable bus transceiver with register staging - isolates CPU from peripheral timing skew while supporting burst reads/writes.

Use Value: Enables synchronous handshaking at up to 90 MHz with sub-11-ns propagation delay, reducing bus turnaround overhead in real-time control loops.

Use Scenario: Extending address/data bus width for add-on I/O modules in industrial PLC backplanes.

IC Role / Device Role / Timing Role: Provides registered latching of control/status signals between master controller and remote I/O cards - decouples timing domains.

Use Value: Independent SAB/SBA and CLKAB/CLKBA controls allow staggered loading of A/B registers, preventing metastability in multi-drop bus topologies.

Dual-Port Memory Arbitration

Legacy System Bus Bridging

Use Scenario: Managing concurrent access to shared SRAM between DSP and host processor in audio/video processing systems.

IC Role / Device Role / Timing Role: Functions as a dual-ported register buffer - stores DSP writes while allowing host reads from previous cycle's data.

Use Value: Real-time/stored mode selection permits zero-wait-state read-after-write cycles, improving effective memory bandwidth by eliminating interlock stalls.

Use Scenario: Interfacing modern 5-V CPLD-based glue logic to aging 16-bit ISA or VMEbus systems.

IC Role / Device Role / Timing Role: Translates between asynchronous legacy bus strobes and synchronous FPGA control logic - absorbs timing skews via register staging.

Use Value: TTL-compatible inputs and ±24 mA drive ensure robust signal integrity across long backplane traces, meeting VME spec setup/hold margins.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit registered transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ACT16245DL	No internal registers; only 3-state transceiver (no clock/S inputs); 16-bit unidirectional or configurable bidirectional.	Suitable for simple bus buffering without data staging - lacks real-time/stored multiplexing and independent register control.	Choose when deterministic latency and minimal logic depth are prioritized over data storage capability.
SN74LVTH16652DGGR	Lower voltage (3.3 V), higher speed (t_PD ≤ 4.2 ns), but not TTL-input compatible; LVTH series with bus-hold inputs.	Designed for mixed-voltage 3.3-V systems interfacing to 5-V peripherals via level shifters - incompatible with direct 5-V TTL inputs.	Prefer for new 3.3-V designs requiring faster timing; requires external level translation for 5-V bus integration.

Compared with 74ACT16652DL, the 74ACT16245DL offers lower latency but no register functionality, while the SN74LVTH16652DGGR provides superior speed and lower power at 3.3 V but sacrifices TTL input compatibility and industrial temperature range - making 74ACT16652DL uniquely suited for legacy 5-V registered bus architectures.

Availability

74ACT16652DL is available at Aetrix Electronics and suitable for industrial control systems, test equipment interfaces, and legacy microprocessor bus expansion requiring stable component supply, long-term lifecycle support, and guaranteed obsolescence management.

Supply support for 74ACT16652DL 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 industrial and automotive ICs.

The 74ACT16652DL belongs to TI's Widebus™ family of high-speed bus interface devices, designed specifically for noise-immune, register-enhanced data routing in demanding 5-V system backplanes and control buses.

FAQ

What is the maximum operating frequency of the 74ACT16652DL?

The 74ACT16652DL supports a maximum clock frequency of 90 MHz under recommended operating conditions (V_CC = 5 V ± 0.5 V, T_A = 25°C). This rating applies to both CLKAB and CLKBA inputs and is validated by timing parameters including t_w (minimum pulse width) of 5.5 ns and f_max = 90 MHz in the official datasheet SCAS128C.

Does the 74ACT16652DL support true bidirectional data flow without external direction control logic?

Yes, the 74ACT16652DL enables full bidirectional operation through complementary OEAB/OEBA and SAB/SBA inputs - no external direction lines are needed. When OEAB is low and OEBA is high, data flows from A to B; reversing OE states enables B-to-A transfer, all while maintaining independent register control via CLKAB/CLKBA.

Can the 74ACT16652DL operate with 3.3-V logic inputs?

No, the 74ACT16652DL is not guaranteed to recognize 3.3-V logic levels as valid inputs. Its TTL-compatible input thresholds require V_IL ≤ 0.8 V and V_VIH ≥ 2.0 V, optimized for 5-V systems. Applying 3.3-V signals may result in marginal or unreliable switching - use level translators or select an LVTH-family alternative like SN74LVTH16652 for 3.3-V environments.

What is the purpose of the distributed V_CC and GND pins on the 74ACT16652DL package?

The 74ACT16652DL places V_CC on pins 7, 20, 32, and 45, and GND on pins 4, 11, 27, 39, and 53 to minimize power delivery inductance and ground bounce. This distributed configuration reduces high-frequency switching noise - a key design feature verified by its 500-mA latch-up immunity at 125°C and stated benefit of "minimizing high-speed switching noise" in the datasheet.

Is the 74ACT16652DL pin-compatible with the 74ACT16245 or other ACT-series transceivers?

No, the 74ACT16652DL is not pin-compatible with the 74ACT16245 or other standard transceivers. Its 56-pin SSOP-DL footprint includes dedicated clock, select, and dual-OE inputs absent in simpler transceivers - requiring unique PCB layout. Pin mapping is defined exclusively in the SCAS128C datasheet Figure "54ACT16652, 74ACT16652 … (TOP VIEW)".

74ACT16652DL Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

Package/Case:: 56-BSSOP (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 56-SSOP

74ACT16652DL FAQ

1.How can I place an order for 74ACT16652DL through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ACT16652DL 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 74ACT16652DL reliable?

The price and inventory of 74ACT16652DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16652DL is usually 5 days.

3.What payment methods are accepted for 74ACT16652DL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16652DL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ACT16652DL?

74ACT16652DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ACT16652DL 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 74ACT16652DL?

For technical support, including 74ACT16652DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16652DL requirements.

6.How does Aetrix verify that 74ACT16652DL is sourced from the original manufacturer or authorized distributors?

All 74ACT16652DL 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 74ACT16652DL meets industry standards.

7.What is the process for return or replacement of 74ACT16652DL?

All 74ACT16652DL units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16652DL, 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 74ACT16652DL part is unused and in its original packaging.

Return procedure for 74ACT16652DL:

1.Submit a request within 90 days.

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

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