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Texas Instruments 74ACT16543DLRG4
- Part No.:
- 74ACT16543DLRG4
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16543DLRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
74ACT16543DLRG4 from Texas Instruments is a 16-bit registered transceiver IC with dual 8-bit bidirectional data paths, 3-state outputs, and independent latch-enable and output-enable controls for A↔B directionality. It operates at 4.5–5.5 V, supports –40°C to 85°C industrial temperature range, and delivers 3.1–13.8 ns propagation delays. It is used in high-density bus interface applications requiring flow-through PCB layout and noise-immune data latching.
For engineers reviewing the 74ACT16543DLRG4 datasheet, 74ACT16543DLRG4 pinout, 74ACT16543DLRG4 application, or 74ACT16543DLRG4 equivalent, this page provides verified functional identity, DL-package pin mapping, timing-critical enable logic behavior, TTL-compatible input thresholds, and validated alternative options for bus transceiver replacement.
Technical Context
The 74ACT16543DLRG4 implements two independent octal D-type latch registers-one for A-to-B and one for B-to-A data flow-each with dedicated CE, LE, and OE control inputs. Its EPIC (Enhanced-Performance Implanted CMOS) 1-μm process enables 24 mA drive strength and 500 mA latch-up immunity at 125°C.
It features distributed VCC/GND pin configuration across the 56-pin DL package to minimize simultaneous switching noise, and its flow-through architecture aligns I/O pins on opposite sides to simplify layer routing. Input voltage compatibility spans 0–VCC, with VIH = 2 V and VIL = 0.8 V under 5 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL and CMOS systems without level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing bus interfaces. |
| Propagation Delay | 3.1–13.8 ns - supports high-speed synchronous bus transfers up to ~100 MHz system timing margins. |
| Output Drive | ±24 mA - sufficient to drive 50-pF loads and standard TTL fanout without external buffers. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees reliable interfacing with legacy TTL logic families. |
| Power Dissipation | 1.4 W (max) - defined for DL package at TA = 55°C, enabling thermal design with standard PCB copper area. |
| Latch-Up Immunity | 500 mA typical at 125°C - meets JEDEC JESD78 requirements for robustness in noisy environments. |
Pinout & Package
74ACT16543DLRG4 is packaged in a 56-pin shrink small-outline package (SSOP-DL), 380-mil body width, 25-mil center-to-center pin pitch, with gull-wing leads and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Individually disables A→B or B→A outputs to high-impedance state; critical for bus contention avoidance. |
| 1LEAB, 2LEAB, 1LEBA, 2LEBA | Latch Enable (active-low) | Controls transparent vs. storage mode per octal register; low-to-high transition captures data. |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Chip Enable (active-low) | Gates data entry into latches; must be low for LE to affect latch state. |
| A1–A8, B1–B8 (×2 sets) | Bidirectional Data I/O | 16 total I/O pins split into two 8-bit ports; each port supports independent direction control. |
| VCC, GND (×8 each) | Power Distribution | Distributed supply/ground pins reduce simultaneous switching noise and improve signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins placed on opposite sides of package to eliminate layer crossovers and reduce trace length in dense PCB layouts. |
| Dual independent 8-bit registers | Enables flexible configuration as either one 16-bit transceiver or two isolated 8-bit channels with separate control logic. |
| TTL-voltage compatible inputs | Accepts standard TTL logic levels (0.8 V / 2.0 V thresholds) while operating from 5 V supply - eliminates need for input level shifters. |
| 3-state true outputs | Provides full logic-level pass-through (no inversion) with high-impedance disable - essential for shared-bus arbitration. |
| EPIC CMOS process | Delivers high noise immunity, low static power (ICC ≤ 80 μA), and robust latch-up resistance (500 mA @ 125°C). |
Applications
| Industrial Backplane Interface | Memory Expansion Bus |
|---|---|
Use Scenario: Bidirectional data transfer between CPU module and peripheral cards in modular PLC chassis with hot-swap capability. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, noise-resilient data latching between asynchronous backplane domains. Use Value: Distributed VCC/GND pins and flow-through layout reduce crosstalk and meet IEC 61000-4-2 ESD immunity requirements for field-deployed equipment. |
Use Scenario: Interfacing FPGA-based memory controller to parallel SRAM or Flash modules with separate address/data multiplexing. IC Role / Device Role / Timing Role: Direction-controlled 16-bit data path with independent latch enables to manage read/write strobes and address setup/hold timing. Use Value: 3.1 ns tPHL and ±24 mA drive ensure setup/hold compliance for 10 ns SRAM access cycles without additional timing margin. |
| Test Equipment Data Acquisition | Legacy System Bus Bridge |
Use Scenario: High-fidelity digital pattern capture between DUT and ATE controller using parallel 16-bit test vectors. IC Role / Device Role / Timing Role: Registered buffer isolating tester logic from DUT load while preserving signal edge fidelity and timing correlation. Use Value: 12 pF Cio and 45 pF Cd minimize capacitive loading on high-speed test lines, maintaining <100 ps skew across all 16 bits. |
Use Scenario: Bridging ISA or VMEbus peripherals to modern microcontroller subsystems with mismatched voltage or timing domains. IC Role / Device Role / Timing Role: Level-tolerant, directionally gated transceiver enabling protocol-transparent data handoff between legacy and new controllers. Use Value: TTL-compatible inputs and 5 V operation allow direct connection to 5 V ISA slots without translation, reducing BOM count by one IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16543DGGR | TSSOP-56 (DGG) package; 0.5 mm pitch, 6.1 mm width vs. DL's 0.65 mm pitch, 10.2 mm width. | Preferred for high-density SMT layouts where board space is constrained; requires finer-pitch assembly capability. | Select DGGR when footprint area is prioritized over rework accessibility and thermal mass. |
| SN74ACT16543DLR | Same DL package, identical pinout and electrical specs; differs only in RoHS-compliant NIPDAU finish and tape-and-reel packaging (1000 pcs/reel). | No functional difference; intended for same industrial bus applications but with updated environmental compliance. | Choose SN74ACT16543DLR for new designs requiring RoHS-6 compliance and TI's current production release. |
Compared with 74ACT16543DLRG4, the DGGR variant reduces PCB area by ~40% but increases assembly complexity, while SN74ACT16543DLR offers identical performance with certified lead-free finish and modern packaging - making it the recommended drop-in replacement for new production builds.
Availability
74ACT16543DLRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion buses, automated test equipment, and legacy system bus bridges requiring stable component supply and long-term lifecycle support.
Supply support for 74ACT16543DLRG4 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 portfolio coverage.
The 74ACT16543DLRG4 belongs to TI's Widebus™ family of high-speed CMOS transceivers, designed specifically for noise-immune, high-density parallel bus interfacing in industrial control and computing infrastructure.
FAQ
What is the exact package type and pin count of the 74ACT16543DLRG4?
The 74ACT16543DLRG4 uses a 56-pin shrink small-outline package (SSOP-DL) with 380-mil body width and 25-mil pin pitch. It is not pin-compatible with TSSOP (DGG) variants despite identical pin count - DL and DGG have different land patterns, thermal pads, and mechanical dimensions. Always verify footprint against TI's SLMA005B package drawing before layout.
Does the 74ACT16543DLRG4 support true bidirectional data flow without external direction control logic?
Yes, the 74ACT16543DLRG4 supports fully independent bidirectional operation: A-to-B and B-to-A paths each have dedicated CE, LE, and OE inputs. No external direction line or glue logic is required - directionality is managed entirely through the four enable inputs per channel, enabling concurrent or staggered transfers.
What are the absolute maximum ratings for supply voltage and operating temperature of the 74ACT16543DLRG4?
The 74ACT16543DLRG4 has an absolute maximum supply voltage of –0.5 V to 7 V and a storage temperature range of –65°C to +150°C. Its rated operating free-air temperature is –40°C to +85°C, with absolute maximum junction temperature limited to 150°C per JEDEC standards. Exceeding 7 V on VCC risks permanent damage.
How does the flow-through architecture of the 74ACT16543DLRG4 improve PCB layout efficiency?
The 74ACT16543DLRG4 places A-side I/O pins on one long edge and B-side I/O pins on the opposite edge, with control signals and power distributed across ends. This allows straight-layer routing without vias or crossovers - reducing trace inductance, improving signal integrity, and cutting layout time by up to 30% in dense backplane designs.
Is the 74ACT16543DLRG4 functionally identical to the SN74ACT16543DLR part?
Yes - the 74ACT16543DLRG4 and SN74ACT16543DLR share identical logic functionality, timing, DC specifications, and DL-package pinout. The "G4" suffix denotes a specific TI manufacturing lot and packaging variant (e.g., tape-and-reel quantity, marking format), not a functional revision. Both meet the same SCAS126B datasheet specifications.
74ACT16543DLRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
74ACT16543DLRG4 FAQ
1.How can I place an order for 74ACT16543DLRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16543DLRG4 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 74ACT16543DLRG4 reliable?
The price and inventory of 74ACT16543DLRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16543DLRG4 is usually 5 days.
3.What payment methods are accepted for 74ACT16543DLRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16543DLRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16543DLRG4?
74ACT16543DLRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16543DLRG4 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 74ACT16543DLRG4?
For technical support, including 74ACT16543DLRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16543DLRG4 requirements.
6.How does Aetrix verify that 74ACT16543DLRG4 is sourced from the original manufacturer or authorized distributors?
All 74ACT16543DLRG4 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 74ACT16543DLRG4 meets industry standards.
7.What is the process for return or replacement of 74ACT16543DLRG4?
All 74ACT16543DLRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16543DLRG4, 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 74ACT16543DLRG4 part is unused and in its original packaging.
Return procedure for 74ACT16543DLRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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