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Texas Instruments 74ACT16651DLRG4
- Part No.:
- 74ACT16651DLRG4
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16651DLRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,389
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Product details
Overview
74ACT16651DLRG4 from Texas Instruments is a 16-bit bus transceiver with dual 8-bit registers, 3-state outputs, inverting data paths, and independent A/B bus control logic. It operates at 5 V, supports up to 90 MHz clock frequency, delivers ±24 mA output drive, and is characterized for –40°C to 85°C industrial temperature range. It enables real-time or stored-data bidirectional transfer between two 16-bit buses in high-density PCB layouts.
For engineers reviewing the 74ACT16651DLRG4 datasheet, 74ACT16651DLRG4 pinout, 74ACT16651DLRG4 application, or 74ACT16651DLRG4 equivalent, key selection criteria include its multiplexed register/transceiver architecture, flow-through layout optimization, distributed VCC/GND pinning for noise reduction, and TTL-voltage-compatible inputs - all critical for synchronous bus isolation and data staging in legacy digital systems.
Technical Context
The 74ACT16651DLRG4 integrates two independent 8-bit D-type flip-flop banks (A and B), each with dedicated clock (CLKAB/CLKBA), select-control (SAB/SBA), and output-enable (OEAB/OEBA) inputs. Its flow-through architecture allows concurrent real-time pass-through and registered data routing without internal decoding glitches during mode transitions.
It uses TI's EPIC™ 1-µm CMOS process, features 500-mA latch-up immunity at 125°C, and implements distributed power/ground pinning across the 56-pin SSOP package to minimize simultaneous switching noise. Input thresholds are TTL-compatible (VIL = 0.8 V, VVIH = 2.0 V), and output drive meets ACT-family specifications (VOH ≥ 3.94 V @ 24 mA, VOL ≤ 0.44 V @ 24 mA at VCC = 4.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ACT (Advanced CMOS TTL-compatible), enabling direct interface with 74LS/74F systems without level shifters |
| Bus Width | 16-bit bidirectional (configurable as two 8-bit or one 16-bit transceiver), supporting flexible memory/data bus partitioning |
| Max Clock Frequency | 90 MHz - defines maximum synchronous data staging rate for register-to-bus transfers |
| Output Drive | ±24 mA - sufficient to drive 50-pF loads with <12.7 ns propagation delay, ensuring signal integrity on loaded backplanes |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of typical power rail ripple |
| Input Compatibility | TTL-voltage compatible (VIL ≤ 0.8 V, VVIH ≥ 2.0 V) - eliminates need for external voltage translation when interfacing with legacy TTL devices |
Pinout & Package
74ACT16651DLRG4 is packaged in a 56-pin Shrink Small-Outline Package (SSOP), DL suffix, 300-mil body width, with 0.025-inch (0.635 mm) center-to-center pin pitch. The package features distributed VCC and GND pins to suppress high-speed switching noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Independently controls 3-state output drivers for A→B and B→A paths; enables bus isolation or bidirectional drive |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register Clock (positive-edge) | Captures data from A or B bus into internal D flip-flops on rising edge; operation is independent of OE/S states |
| 1SAB, 2SAB, 1SBA, 2SBA | Select Control (high = stored data) | Determines whether transceiver outputs real-time bus data (low) or registered data (high); eliminates multiplexer glitch |
| A1–A8, A9–A16, B1–B8, B9–B16 | Bi-directional I/O terminals | 16-bit A and B bus interfaces; support both input capture and output driving with 3-state control per group |
| VCC, GND (pins 7, 11, 20, 27, 32, 39, 46, 53) | Distributed power/ground | Eight total VCC/GND pairs placed across package to reduce impedance and suppress simultaneous switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Inverting data paths | Ensures consistent polarity alignment across A↔B transfers without external inversion logic, simplifying timing analysis |
| Multiplexed real-time/stored data flow | Enables seamless switching between live bus monitoring and buffered register readback - critical for diagnostic and test modes |
| Flow-through architecture | Minimizes trace length between adjacent I/O pins, reducing parasitic inductance and improving signal integrity on dense PCBs |
| EPIC™ 1-µm CMOS process | Delivers ACT-speed performance with low static power (ICC ≤ 80 µA) and high latch-up immunity (500 mA @ 125°C) |
| TTL-voltage compatible inputs | Accepts standard TTL logic levels directly, eliminating level-shifter components in mixed-logic-system designs |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
|
Use Scenario: Interfacing a microprocessor local bus to a multi-slot industrial backplane carrying sensor data and control commands. IC Role / Device Role / Timing Role: 16-bit bidirectional transceiver with register staging, isolating CPU address/data from noisy backplane signals while enabling synchronized snapshot capture. Use Value: Real-time transfer maintains low-latency control response; stored-data mode allows safe CPU readback of backplane state during arbitration pauses. |
Use Scenario: Upgrading a 1980s-era minicomputer system with new I/O cards while preserving original bus protocol and timing. IC Role / Device Role / Timing Role: Pin-compatible replacement for obsolete 74F651/74AS651 transceivers, providing identical function with improved noise margin and drive strength. Use Value: TTL-compatible inputs and ±24 mA outputs ensure drop-in compatibility; distributed VCC/GND pins reduce ground bounce in vintage board layouts. |
| Programmable Logic Data Staging | Test Equipment Signal Routing |
|
Use Scenario: Buffering and synchronizing data between FPGA configuration logic and external SRAM or flash memory in boundary-scan test fixtures. IC Role / Device Role / Timing Role: Dual-register transceiver capturing parallel data on one edge and presenting it on another, decoupling FPGA clock domain from memory access timing. Use Value: Independent SAB/SBA and CLKAB/CLKBA controls allow precise staging of write data and read response without added logic gates or FIFOs. |
Use Scenario: Reconfigurable signal path in automated test equipment (ATE) where stimulus and response lines must be dynamically routed between DUT pins and measurement instruments. IC Role / Device Role / Timing Role: Bidirectional 16-bit switch with register hold capability, enabling glitch-free path reconfiguration during test sequence execution. Use Value: Select-control glitch elimination prevents spurious signals during path switching; 3-state outputs enable clean bus sharing among multiple instrument channels. |
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 |
|---|---|---|---|
| 74ACT16245DLR | No internal registers; pure 3-state transceiver with non-inverting paths and separate direction control (DIR) | Lacks real-time/stored data multiplexing; requires external clocking logic for staging | Choose when only bus buffering is needed and register functionality is implemented elsewhere |
| SN74LVC16646ADLR | 3.3-V LVCMOS family; higher speed (tPD ≈ 5.3 ns), but lower drive (±24 mA @ 3.3 V), no TTL input compatibility | Requires level translation for 5-V systems; not suitable for direct 74LS/74F interface | Choose for new 3.3-V designs prioritizing speed and lower power over legacy compatibility |
Compared with 74ACT16651DLRG4, the 74ACT16245DLR offers simpler control but no data staging, while the SN74LVC16646ADLR provides faster switching at 3.3 V but sacrifices 5-V TTL interoperability - making the 74ACT16651DLRG4 uniquely suited for industrial upgrades requiring register-based bus management without voltage translation.
Availability
74ACT16651DLRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, programmable logic data staging, and automated test equipment signal routing requiring stable component supply and long-term obsolescence mitigation.
Supply support for 74ACT16651DLRG4 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 with broad industrial, automotive, and communications reach.
The 74ACT16651DLRG4 belongs to TI's Widebus™ family of high-density bus interface ICs, designed specifically for noise-resilient, high-speed data transfer in space-constrained industrial and instrumentation systems.
FAQ
What is the operating voltage range for the 74ACT16651DLRG4?
The 74ACT16651DLRG4 operates over a supply voltage range of 4.5 V to 5.5 V, with recommended conditions specifying 4.5 V (min), 5 V (nominal), and 5.5 V (max). This range ensures compatibility with standard 5-V logic rails while accommodating typical power supply tolerances and ripple in industrial environments.
Does the 74ACT16651DLRG4 support true bidirectional data flow between two 16-bit buses?
Yes, the 74ACT16651DLRG4 supports full bidirectional operation via independent OEAB/OEBA and SAB/SBA controls. It can route data from bus A to bus B, bus B to bus A, or both simultaneously - with real-time pass-through or registered (stored) data, all under separate control per 8-bit segment.
How does the 74ACT16651DLRG4 eliminate multiplexer glitches during real-time/stored data switching?
The 74ACT16651DLRG4 uses dedicated select-control circuitry (SAB/SBA) that avoids combinatorial decoding during mode transitions. As confirmed in the function table and Figure 1, this design ensures glitch-free output during real-time ↔ stored data switching - a key differentiator versus discrete mux + latch implementations.
Is the 74ACT16651DLRG4 pin-compatible with older 74F or 74AS transceivers?
The 74ACT16651DLRG4 shares the same 56-pin DL SSOP footprint and functional pinout as industry-standard 16-bit transceivers like the 74F651 and 74AS651, including identical A/B I/O, clock, select, and enable assignments - enabling direct replacement in most legacy layouts without PCB revision.
What thermal and reliability specifications apply to the 74ACT16651DLRG4?
The 74ACT16651DLRG4 is characterized for –40°C to +85°C operation and features 500-mA typical latch-up immunity at 125°C. Its EPIC™ 1-µm CMOS process and distributed VCC/GND pinning provide robust noise immunity and long-term reliability in thermally demanding industrial applications.
74ACT16651DLRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
74ACT16651DLRG4 FAQ
1.How can I place an order for 74ACT16651DLRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16651DLRG4 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 74ACT16651DLRG4 reliable?
The price and inventory of 74ACT16651DLRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16651DLRG4 is usually 5 days.
3.What payment methods are accepted for 74ACT16651DLRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16651DLRG4 transactions.
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4.How is shipping managed for 74ACT16651DLRG4?
74ACT16651DLRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16651DLRG4 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 74ACT16651DLRG4?
For technical support, including 74ACT16651DLRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16651DLRG4 requirements.
6.How does Aetrix verify that 74ACT16651DLRG4 is sourced from the original manufacturer or authorized distributors?
All 74ACT16651DLRG4 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 74ACT16651DLRG4 meets industry standards.
7.What is the process for return or replacement of 74ACT16651DLRG4?
All 74ACT16651DLRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16651DLRG4, 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 74ACT16651DLRG4 part is unused and in its original packaging.
Return procedure for 74ACT16651DLRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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