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Texas Instruments 74AC16623DL
- Part No.:
- 74AC16623DL
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
74AC16623DL.pdf
- Description:
- BUS TRANSCEIVER
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Product details
Overview
74AC16623DL from Texas Instruments is a 16-bit dual-supply CMOS bus transceiver with independent A↔B bidirectional data flow control, ±24 mA drive strength at 5 V, 5.1 ns typical propagation delay (VCC = 5 V), and operation from −40°C to 85°C. It serves as an asynchronous interface between two data buses in industrial backplanes and legacy computing systems.
For engineers reviewing the 74AC16623DL datasheet, 74AC16623DL pinout, 74AC16623DL application, or 74AC16623DL equivalent, key selection criteria include dual OE control logic, flow-through pinout for PCB routing efficiency, distributed VCC/GND for noise suppression, and EPIC™ process-based latch-up immunity up to 500 mA at 125°C.
Technical Context
The 74AC16623DL implements a dual 8-bit transceiver architecture with separate OEAB (A→B enable) and OEBA (B→A enable) controls, enabling four distinct operational modes per section: A-to-B, B-to-A, bidirectional latching, and high-impedance isolation. Its flow-through pinout places inputs and outputs on opposite sides of the package to minimize trace crossovers.
It uses TI's EPIC™ 1-µm CMOS process with distributed VCC and GND pins (12 total power/ground terminals across 48 pins) to reduce simultaneous switching noise. The device supports 3-V to 5.5-V supply operation and meets ANSI/IEEE Std 91-1984 logic symbol conventions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and backward compatibility with 5-V TTL buses |
| Propagation Delay (tPLH/tPHL) | 2.3 ns min / 7.7 ns max at VCC = 5 V - enables reliable timing in 100+ MHz bus cycles with margin |
| Output Drive Strength | ±24 mA at VCC = 4.5–5.5 V - sufficient to drive 50-pF loads across 10-inch PCB traces without termination |
| Input Thresholds (VIH/VIL) | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - ensures robust noise immunity against 0.4-V noise margins |
| Power Dissipation Capacitance | 47 pF enabled / 8 pF disabled - reduces dynamic power by >80% during bus idle states |
| Latch-Up Immunity | 500 mA typical at 125°C - exceeds JEDEC JESD78 Class II requirements for industrial environments |
| Operating Temperature | −40°C to +85°C - qualified for extended-temperature industrial control and telecom infrastructure |
Pinout & Package
Packaged in a 48-pin shrink small-outline (SSOP) DL package (300-mil width, 25-mil pin pitch), the 74AC16623DL features a flow-through pin arrangement optimized for layer-count reduction in dense PCB layouts. Power distribution includes six VCC and six GND pins interleaved across both sides.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB | A→B output enable (active low) | Controls directionality: low enables A-bus drivers to drive B-bus; high places A outputs in high-Z |
| 1OEBA, 2OEBA | B→A output enable (active low) | Controls reverse direction: low enables B-bus drivers to drive A-bus; high isolates B outputs |
| 1A1–1A8, 2A1–2A8 | Port A data I/O (first/second 8-bit group) | Bi-directional data terminals connected to local bus; driven only when respective OEAB/OEBA is low |
| 1B1–1B8, 2B1–2B8 | Port B data I/O (first/second 8-bit group) | Bi-directional data terminals connected to remote bus; driven only when respective OEBA/OEAB is low |
| VCC (pins 7, 18, 29, 34, 40, 45) | Positive supply | Distributed power pins reduce IR drop and ground bounce across high-speed switching events |
| GND (pins 4, 10, 15, 21, 31, 37) | Ground reference | Interleaved GND pins provide low-inductance return paths for each functional block |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent OE control (OEAB/OEBA) | Enables four-mode operation per 8-bit section: unidirectional A→B, B→A, bidirectional latching, or full isolation |
| Flow-through pin architecture | Places A-side signals on left and B-side on right, eliminating layer jumps and reducing signal crosstalk in 2-layer PCBs |
| Distributed VCC/GND pinning | 12 dedicated power/ground pins minimize simultaneous switching noise and improve signal integrity at >50 MHz |
| EPIC™ 1-µm CMOS process | Delivers 500 mA latch-up immunity at 125°C - critical for hot-swap-capable backplane applications |
| Wide supply range (3 V–5.5 V) | Supports interoperability between 3.3-V microcontrollers and legacy 5-V peripheral buses without level shifters |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Interfacing a modern 3.3-V FPGA controller to a 5-V ISA-compatible peripheral bus in programmable logic controllers. IC Role / Device Role / Timing Role: Asynchronous bidirectional bus transceiver managing data flow between mismatched voltage domains with precise OE-controlled timing windows. Use Value: Eliminates need for discrete level shifters while maintaining <7.7 ns propagation delay and 500 mA latch-up immunity under thermal stress. |
Use Scenario: Extending a 16-bit CPU data bus across a multi-slot motherboard using edge-card connectors with long trace runs. IC Role / Device Role / Timing Role: Signal repeater and bus driver providing ±24 mA drive strength to overcome capacitive loading of >100 pF across 15 cm traces. Use Value: Flow-through pinout reduces layer count by one; distributed VCC/GND suppresses ground bounce during 100-MHz burst transfers. |
| Telecom Line Card Data Mux | Test Equipment Bus Arbitration |
|
Use Scenario: Multiplexing diagnostic data between multiple DSP modules and a central host processor in carrier-grade line cards. IC Role / Device Role / Timing Role: Dual 8-bit transceiver enabling time-sliced access to shared memory buffers via coordinated OEAB/OEBA strobing. Use Value: Bidirectional latching mode (both OEs low) holds bus state during arbitration gaps, preventing metastability in multi-master systems. |
Use Scenario: Isolating DUT (device under test) bus lines from ATE (automated test equipment) drivers during calibration and fault injection sequences. IC Role / Device Role / Timing Role: High-impedance gatekeeper using simultaneous OEAB/OEBA high to decouple buses with <9.4 ns disable time. Use Value: Sub-10 ns Z-state entry/exit ensures clean bus release before next test vector application, avoiding contention glitches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16623DL | Higher drive (±24 mA vs ±24 mA same), but AC version has lower ICC (8 µA vs 24 µA typical) and faster tPLH (2.3 ns vs 2.3 ns identical); ACT variant uses different process with tighter VOH/VOL specs | Preferred for low-power portable instrumentation where quiescent current matters more than absolute speed margin | Select 74ACT16623DL when minimizing standby power in battery-backed systems; verify VOH compatibility with downstream 5-V TTL inputs |
| SN74LVC16623DGGR | 3.3-V only (1.65–3.6 V), smaller 48-pin TSSOP package, lower drive (±24 mA at 3.3 V), 3.5 ns tPLH - not pin-compatible due to different pin mapping and no 5-V tolerance | Suitable for native 3.3-V embedded systems but requires redesign if replacing 5-V legacy interfaces | Choose SN74LVC16623DGGR only in new 3.3-V designs; cannot substitute directly into 74AC16623DL footprints or 5-V signal chains |
Compared with 74AC16623DL, the 74ACT16623DL offers identical timing and drive but lower static power, while the SN74LVC16623DGGR trades 5-V compatibility and pinout for compact size and 3.3-V optimization - neither is pin-compatible, requiring layout revision for substitution.
Availability
74AC16623DL is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, telecom line card data multiplexing, and automated test equipment bus arbitration requiring stable component supply over extended product lifecycles.
Supply support for 74AC16623DL 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 74AC16623DL belongs to TI's Widebus™ family of high-speed CMOS transceivers, designed specifically for noise-resilient, high-density bus interfacing in extended-temperature industrial and telecom infrastructure.
FAQ
What is the maximum operating supply voltage for the 74AC16623DL?
The 74AC16623DL supports a supply voltage range of 3 V to 5.5 V, with absolute maximum rating of 7 V. Operation above 5.5 V violates recommended conditions and risks parametric degradation. At 5.5 V, it delivers guaranteed ±24 mA output drive and maintains VOH ≥ 4.94 V and VOL ≤ 0.44 V across −40°C to 85°C.
How does the dual OE control (OEAB and OEBA) function in the 74AC16623DL?
The 74AC16623DL uses active-low OEAB to enable A→B data flow and active-low OEBA to enable B→A flow. When both are low, the transceiver enters bidirectional latching mode - each port reinforces its own state, holding bus values even when external drivers go high-Z. This behavior is confirmed in the FUNCTION TABLE on page 3−1 of SCAS172.
Is the 74AC16623DL pin-compatible with other 48-pin Widebus transceivers like the 74AC16245?
No, the 74AC16623DL is not pin-compatible with the 74AC16245. While both are 48-pin DL-packaged transceivers, the 74AC16623DL has dual OE controls (OEAB/OEBA) and split 8-bit sections with distinct pin assignments, whereas the 74AC16245 uses single-directional OE and different pin mapping. Pinout validation confirms non-interchangeability.
What is the significance of the "flow-through architecture" in the 74AC16623DL?
The flow-through architecture places all Port A signals on the left side and Port B signals on the right side of the 48-pin DL package, enabling straight-line PCB routing without layer transitions. This reduces crosstalk, simplifies layout in space-constrained industrial modules, and is explicitly cited in the datasheet as optimizing PCB layout - verified in the top-view pin diagram on page 3−2.
Does the 74AC16623DL support mixed-voltage operation between 3.3 V and 5 V buses?
Yes, the 74AC16623DL supports mixed-voltage operation: its 3 V–5.5 V supply range allows it to interface 3.3-V logic (with VIH = 2.1 V min at VCC = 3 V) to 5-V buses. Input thresholds scale with VCC, and outputs swing rail-to-rail - confirmed in RECOMMENDED OPERATING CONDITIONS (page 3−3) and ELECTRICAL CHARACTERISTICS tables.
74AC16623DL 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:
- -
74AC16623DL FAQ
1.How can I place an order for 74AC16623DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC16623DL 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 74AC16623DL reliable?
The price and inventory of 74AC16623DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16623DL is usually 5 days.
3.What payment methods are accepted for 74AC16623DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC16623DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC16623DL?
74AC16623DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC16623DL 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 74AC16623DL?
For technical support, including 74AC16623DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16623DL requirements.
6.How does Aetrix verify that 74AC16623DL is sourced from the original manufacturer or authorized distributors?
All 74AC16623DL 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 74AC16623DL meets industry standards.
7.What is the process for return or replacement of 74AC16623DL?
All 74AC16623DL units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16623DL, 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 74AC16623DL part is unused and in its original packaging.
Return procedure for 74AC16623DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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