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Texas Instruments 74AC16652DLRG4
- Part No.:
- 74AC16652DLRG4
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74AC16652DLRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,733
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Product details
Overview
74AC16652DLRG4 from Texas Instruments is a 16-bit bus transceiver and register IC with independent A/B bus control, 3-state outputs, dual-clock (CLKAB/CLKBA) and dual-select (SAB/SBA) logic, supporting real-time or stored data flow-through at up to 95 MHz (VCC = 5 V). It operates from –40°C to 85°C and is packaged in a 56-pin shrink small-outline package (SSOP-DL), used in high-density backplane and memory interface applications requiring latch-controlled bidirectional data routing.
For engineers reviewing the 74AC16652DLRG4 datasheet, 74AC16652DLRG4 pinout, 74AC16652DLRG4 application, or 74AC16652DLRG4 equivalent, key selection criteria include its dual-register architecture, glitch-free select control, distributed VCC/GND pin layout for noise reduction, and compatibility with 3-V to 5.5-V supply systems in industrial and telecom infrastructure designs.
Technical Context
The 74AC16652DLRG4 implements two independent 8-bit D-type flip-flop banks (A and B sides), each with dedicated clock (CLKAB/CLKBA), output-enable (OEAB/OEBA), and select-control (SAB/SBA) inputs. Its multiplexed flow-through architecture allows concurrent real-time pass-through and registered storage without decoding glitches during mode transitions.
It uses TI's EPIC™ 1-µm CMOS process, delivering 500-mA latch-up immunity at 125°C and supporting simultaneous A→B, B→A, or bidirectional stored-data transfer per the function table. The DL package features 25-mil center-to-center pin spacing and distributed power/ground pins to minimize high-speed switching noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5-V logic compatibility |
| Max clock frequency | 95 MHz at VCC = 5 V - enables high-throughput data routing in fast synchronous buses |
| Propagation delay | tPLH/tPHL ≤ 9.2 ns (A↔B, VCC = 5 V) - ensures timing-critical synchronization in real-time interconnects |
| Output drive | ±24 mA at VCC = 5 V - drives standard TTL loads and multiple CMOS inputs without buffering |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment |
| Input leakage | ±1 µA max (VI = VCC/GND, VCC = 5.5 V) - minimizes static current draw in low-power standby modes |
| Power dissipation capacitance | 57 pF per transceiver (outputs enabled) - enables accurate dynamic power estimation in high-frequency operation |
Pinout & Package
74AC16652DLRG4 is housed in a 56-pin shrink small-outline package (SSOP-DL), 300-mil body width, with 25-mil pin pitch and exposed thermal pad not present. Pin layout follows TI's standard DL footprint for mechanical and thermal compatibility with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output-enable controls | Independent 3-state enable for each 8-bit bus segment; low-active assertion allows precise direction and isolation control |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register clocks | Rising-edge-triggered clocks store data into respective A or B flip-flops regardless of OE/S state |
| 1SAB, 2SAB, 1SBA, 2SBA | Select-control inputs | High = route stored data; low = route real-time bus data; eliminates multiplexer transition glitches |
| A1–A8, B1–B8 (x2) | Bidirectional I/O terminals | Two independent 8-bit buses support split or unified 16-bit operation; all pins tolerate 5.5-V input with 3-V–5.5-V VCC |
| VCC (pins 7, 22, 36, 46, 50) | Power supply | Distributed VCC pins reduce simultaneous switching noise and improve signal integrity on dense PCBs |
| GND (pins 4, 11, 25, 33, 39, 44, 53) | Ground reference | Seven GND pins provide low-inductance return paths and enhance EMI performance in high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-register architecture | Separate A-side and B-side D-flip-flops allow independent storage and routing - eliminates external latch requirements in bus arbitration logic |
| Glitch-free select control | SAB/SBA inputs prevent transient bus contention during real-time ↔ stored mode transitions - improves system reliability in hot-swap and dynamic reconfiguration |
| Distributed power/ground | Five VCC and seven GND pins minimize ground bounce and supply droop - sustains timing margins under heavy switching loads |
| EPIC™ process technology | 1-µm CMOS delivers 500-mA latch-up immunity at 125°C - meets stringent robustness requirements for industrial and telecom environments |
| Shrink SSOP (DL) packaging | 56-pin DL package provides double the I/O density of standard SOIC - saves PCB area in space-constrained backplane and module designs |
Applications
| Backplane Data Routing | Memory Interface Buffering |
|---|---|
Use Scenario: Bidirectional data transfer between CPU and peripheral modules across a multi-slot backplane with shared address/data bus. IC Role / Device Role / Timing Role: Bus transceiver and register providing isolated, glitch-free A↔B data flow with real-time or stored forwarding based on slot arbitration signals. Use Value: Enables deterministic latency via clocked storage and eliminates bus contention during slot handoff using independent OEAB/OEBA control. | Use Scenario: Interfacing a microcontroller with dual-port SRAM or flash memory where address latching and data buffering are required. IC Role / Device Role / Timing Role: 16-bit registered transceiver acting as address latch and data bus isolator, synchronizing memory access with system clock edges. Use Value: Supports hold-time compliance and reduces setup skew via tsu = 4.5 ns (VCC = 5 V), while 3-state outputs prevent bus conflicts during read/write cycles. |
| Industrial PLC I/O Expansion | Telecom Line Card Multiplexing |
Use Scenario: Extending digital I/O capacity in programmable logic controllers using daisy-chained expansion modules with local register storage. IC Role / Device Role / Timing Role: Local bus register storing sensor/actuator status and enabling synchronized polling over a serial control bus. Use Value: Allows deterministic scan-cycle timing via CLKAB-triggered capture and SAB-controlled output gating - critical for hard real-time I/O response. | Use Scenario: Aggregating and routing time-division multiplexed (TDM) data streams between DSPs and line interface units in access network cards. IC Role / Device Role / Timing Role: High-speed bidirectional transceiver buffering TDM frames between parallel bus domains with clock-domain crossing isolation. Use Value: Achieves 95-MHz operation at 5 V to meet E1/T1 frame timing budgets, while distributed VCC/GND maintains jitter < 100 ps RMS in noisy line card environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC16652DGGR | Same functionality and pinout; packaged in 56-pin TSSOP (DGGR) with 0.5-mm pitch vs. DL's 0.65-mm pitch | TSSOP offers better thermal dissipation and finer-pitch compatibility with modern HDI PCBs | Preferred for new designs targeting automated optical inspection and higher thermal loads |
| 74ACT16652DL | TTL-compatible input thresholds (VIH = 2 V min); otherwise identical architecture and timing | Required when interfacing with legacy 5-V TTL logic families without level shifters | Select only when mixing with 74LS/74F series or driving older peripheral ASICs |
Compared with SN74AC16652DGGR and 74ACT16652DL, the 74AC16652DLRG4 offers optimal cost and legacy board compatibility in the DL package, while maintaining full functional equivalence - making it ideal for drop-in replacement in existing SSOP-based industrial control and telecom hardware.
Availability
74AC16652DLRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card interfaces, memory subsystem buffering, and high-reliability embedded data routing requiring stable component supply across extended product lifecycles.
Supply support for 74AC16652DLRG4 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 interface ICs for industrial and communications markets.
The 74AC16652DLRG4 belongs to TI's Widebus™ family of advanced bus interface devices, designed specifically for high-density, low-noise, and glitch-immune data routing in mission-critical infrastructure equipment.
FAQ
What is the maximum operating frequency of the 74AC16652DLRG4?
The 74AC16652DLRG4 supports a maximum clock frequency of 95 MHz when operated at VCC = 5 V and TA = 25°C, as specified in the switching characteristics table. At VCC = 3.3 V, the maximum frequency drops to 55 MHz. These values reflect guaranteed timing performance under recommended operating conditions and assume proper PCB layout with controlled impedance and minimized trace inductance.
Does the 74AC16652DLRG4 support mixed-voltage operation between A and B buses?
No, the 74AC16652DLRG4 does not support independent voltage domains on A and B buses. It has a single VCC supply (3 V to 5.5 V) powering both sides, and all I/O pins are referenced to that common supply. Input tolerance extends to VCC + 0.5 V, allowing safe interfacing with higher-voltage drivers only if clamped externally - but internal logic levels remain tied to VCC.
How does the 74AC16652DLRG4 eliminate decoding glitches during real-time/stored mode transitions?
The 74AC16652DLRG4 eliminates decoding glitches by using dedicated SAB and SBA inputs with internal synchronous logic that prevents race conditions during mode changes. As confirmed in the datasheet description, the circuitry ensures no transient bus contention occurs when switching between real-time and stored data paths - a key differentiator from discrete multiplexer + latch implementations.
What is the purpose of the multiple VCC and GND pins on the 74AC16652DLRG4?
The 74AC16652DLRG4 features five VCC and seven GND pins to reduce simultaneous switching noise and improve power integrity. This distributed configuration lowers effective power-supply inductance, minimizes ground bounce during high-speed 16-bit toggling, and maintains stable timing margins - especially critical in backplane and telecom applications where signal integrity directly impacts bit error rate.
Can the 74AC16652DLRG4 be used as two independent 8-bit transceivers?
Yes, the 74AC16652DLRG4 can operate as two independent 8-bit transceivers. Its architecture divides the 16-bit structure into two groups (1A–1B and 2A–2B), each with dedicated clock, select, and output-enable inputs. This allows separate control of data flow direction, storage timing, and 3-state output activation for each 8-bit segment - verified in the function table and logic diagram.
74AC16652DLRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
74AC16652DLRG4 FAQ
1.How can I place an order for 74AC16652DLRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC16652DLRG4 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 74AC16652DLRG4 reliable?
The price and inventory of 74AC16652DLRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16652DLRG4 is usually 5 days.
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74AC16652DLRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC16652DLRG4 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 74AC16652DLRG4?
For technical support, including 74AC16652DLRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16652DLRG4 requirements.
6.How does Aetrix verify that 74AC16652DLRG4 is sourced from the original manufacturer or authorized distributors?
All 74AC16652DLRG4 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 74AC16652DLRG4 meets industry standards.
7.What is the process for return or replacement of 74AC16652DLRG4?
All 74AC16652DLRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16652DLRG4, 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 74AC16652DLRG4 part is unused and in its original packaging.
Return procedure for 74AC16652DLRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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