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Texas Instruments 74ACT11543DW
- Part No.:
- 74ACT11543DW
- Manufacturer:
- Texas Instruments
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ACT11543DW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,231
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Product details
Overview
74ACT11543DW from Texas Instruments is an octal registered transceiver with 3-state outputs, implementing dual-directional flow-through data routing between two 8-bit buses. It features independent A-to-B and B-to-A latch enable (LEAB/LEBA) and output enable (GAB/GBA) controls, TTL-compatible inputs, and operates across –40°C to 85°C for industrial bus interface applications.
For engineers reviewing the 74ACT11543DW datasheet, 74ACT11543DW pinout, 74ACT11543DW application, or 74ACT11543DW equivalent, key selection criteria include bidirectional registered storage, 3-state bus isolation timing (tPLH ≤ 9.1 ns), ±24 mA drive strength at 5 V, and SOIC-28 package compatibility with legacy 74ACT logic systems.
Technical Context
This device integrates two independent sets of D-type latches-one for A-to-B and one for B-to-A data paths-enabling simultaneous registration in both directions. Control is decoupled: CEAB/CEBA enables direction entry, LEAB/LEBA captures data on rising edge, and GAB/GBA activates 3-state outputs.
It uses TI's EPIC 1-μm CMOS process, supports 4.5–5.5 V supply, delivers 3.94 V VOH at –24 mA (VCC = 4.5 V), and exhibits 12 pF Cio per I/O port. Center-pin VCC/GND placement minimizes high-speed switching noise, and it provides 500 mA latch-up immunity at 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74ACT - Advanced CMOS TTL-compatible, 5 V only, low-noise, high-speed |
| Data Width | 8-bit bidirectional with separate A and B ports - enables full bus transceivers without external gating |
| Propagation Delay | tPLH/tPHL ≤ 10.2 ns (max) - ensures sub-100 MHz synchronous bus operation with margin |
| Output Drive | ±24 mA at VCC = 4.5 V - sufficient to drive 50 Ω transmission lines or multiple TTL loads |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| Supply Voltage | 4.5 V to 5.5 V - rejects ±10% rail variation; not 3.3 V compatible |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - interfaces directly with 74LS, 74F, and microcontroller GPIO |
Pinout & Package
74ACT11543DW is housed in a 28-pin SOIC (DW) package with 300-mil body width, gull-wing leads, and RoHS-compliant CU-NiPdAu finish. Pin 1 is located at top-left corner (Q1 quadrant), with center-aligned VCC (pins 20, 21) and GND (pins 6–9) for low-inductance power delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | CEBA / CEAB | Chip-enable inputs - must be low to activate respective A↔B data path; disables latching and output drivers when high |
| 2–9 | A1–A8 | Input/data source port A - accepts TTL-level signals; latched into A-to-B register when CEAB and LEAB active |
| 10–13 | GND | Ground reference - four dedicated pins reduce ground bounce in high-speed switching |
| 14–21 | B1–B8 | Output/data sink port B - 3-state outputs reflect A-latch contents when GAB low and CEAB low |
| 22, 23 | VCC | Power supply - dual center-placed pins minimize IR drop and improve noise immunity |
| 24–27 | LEBA, GBA, LEAB, GAB | Latch and output enable controls - LEx clocks data; Gx enables B/A outputs; all are active-low |
Key Features
| Feature | Design Value |
|---|---|
| Back-to-back registers | Independent A-to-B and B-to-A latches allow concurrent bidirectional data staging without arbitration logic |
| Flow-through architecture | Direct signal path from input to output register minimizes PCB trace length and skew between related bits |
| Center-pin VCC/GND | Reduces simultaneous switching noise by shortening high-frequency return current loops across the die |
| EPIC 1-μm CMOS process | Enables 5 V operation with TTL compatibility while maintaining <80 μA typical ICC quiescent current |
| 500 mA latch-up immunity | Guarantees robustness against transient overvoltage events up to 125°C ambient - critical for industrial environments |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Bus Extension |
|---|---|
|
Use Scenario: Isolating and extending parallel address/data buses between CPU modules and I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, noise-immune bidirectional data transfer between isolated 8-bit bus segments. Use Value: Eliminates need for discrete latch + buffer combinations; tPLH ≤ 10.2 ns ensures setup/hold compliance with 8-MHz Z80 or 68K bus cycles. |
Use Scenario: Interfacing 8-bit peripheral controllers (e.g., UARTs, timers) to wider system buses in retro-computing or test equipment designs. IC Role / Device Role / Timing Role: Direction-controlled bus bridge that registers incoming commands and buffers outgoing status without glue logic. Use Value: TTL-compatible inputs accept direct connection to 74LS peripherals; 3-state outputs prevent bus contention during idle periods. |
| Test Equipment Data Acquisition | Programmable Logic I/O Expansion |
|
Use Scenario: Capturing parallel sensor data streams (e.g., ADC outputs) and forwarding them to a master controller via shared bus. IC Role / Device Role / Timing Role: Input register capturing synchronized 8-bit samples on LEAB edge, then driving them onto B-bus under GAB control. Use Value: Simultaneous sampling across all 8 channels enabled by common LEAB; ±24 mA drive supports long traces to FPGA or MCU inputs. |
Use Scenario: Expanding I/O capacity of CPLD/FPGA-based control systems where internal resources are constrained. IC Role / Device Role / Timing Role: Off-chip registered I/O buffer allowing asynchronous host writes to local latch and controlled readback via B-port. Use Value: Reduces FPGA pin count and logic utilization; flow-through layout simplifies PCB routing in dense PLD carrier boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT11245DW | Non-latched, 3-state octal bus transceiver - no internal storage; relies on external clocking | Suitable for simple level-shifting or bus isolation without data retention | Select when bidirectional flow control suffices and registration adds unnecessary latency |
| SN74LVTH16245ADGGR | 16-bit, 3.3 V-only, latch-free, with higher drive (±24 mA) and lower propagation (≤5.5 ns) | Designed for modern low-voltage LVT systems; incompatible with 5 V TTL signaling | Choose for new 3.3 V designs requiring higher bandwidth and lower power - not a drop-in replacement |
Compared with 74ACT11543DW, the 74ACT11245DW omits latching functionality and reduces control complexity but cannot hold data between transfers; the SN74LVTH16245ADGGR offers double width and faster speed at 3.3 V, yet requires voltage translation and redesign for legacy 5 V systems.
Availability
74ACT11543DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microprocessor bus extensions, and programmable logic I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for 74ACT11543DW 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 74ACT family was engineered for high-speed, noise-resilient 5 V digital systems requiring TTL compatibility and robust latch-up immunity - targeting industrial control, test equipment, and legacy computing infrastructure.
FAQ
What is the maximum operating frequency supported by the 74ACT11543DW?
The 74ACT11543DW does not specify a maximum clock frequency in its datasheet, but its worst-case propagation delay (tPLH/tPHL ≤ 10.2 ns at VCC = 4.5 V) supports reliable operation in synchronous bus systems up to approximately 50 MHz, assuming adequate setup/hold margins. Real-world frequency depends on board layout, load capacitance, and control signal timing - the 74ACT11543DW is optimized for burst-mode or strobed data transfers rather than continuous clocked operation.
Is the 74ACT11543DW compatible with 3.3 V logic systems?
No, the 74ACT11543DW is strictly a 5 V device with recommended operating voltage of 4.5–5.5 V and TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V). Its outputs swing rail-to-rail (VOH ≥ 3.94 V at –24 mA), making direct interfacing with 3.3 V CMOS inputs unsafe without level translation. The 74ACT11543DW is not characterized for 3.3 V operation and may exhibit undefined behavior or increased power consumption if operated outside its specified VCC range.
Does the 74ACT11543DW support hot-swap or live-insertion?
The 74ACT11543DW is not designed for hot-swap operation. It lacks powered-off protection, Ioff specification, or bus-hold circuitry. Applying signals to A or B ports while VCC is unpowered risks violating absolute maximum ratings (e.g., VI > VCC + 0.5 V), potentially causing latch-up or permanent damage. For hot-swap applications, the 74ACT11543DW requires external protection circuitry or should be replaced with purpose-built hot-swap transceivers such as the SN74CBT16210.
How does the 74ACT11543DW handle simultaneous A-to-B and B-to-A data transfers?
The 74ACT11543DW supports fully independent A-to-B and B-to-A data paths using separate control inputs (CEAB/LEAB/GAB vs. CEBA/LEBA/GBA). When both CEAB and CEBA are low, and their respective latch enables are asserted, data can be captured into both A and B latches concurrently. However, outputs are 3-state: only one direction's outputs (A or B) can be actively driven at a time to avoid bus contention - the 74ACT11543DW does not permit simultaneous bidirectional driving on shared lines.
What is the thermal performance and power dissipation of the 74ACT11543DW?
At VCC = 5 V and TA = 25°C, the 74ACT11543DW exhibits typical ICC of 0.9 mA (with one input at 3.4 V) and 8 μA quiescent current (all inputs at VCC/GND). Power dissipation capacitance is 47 pF (outputs enabled) and 13 pF (outputs disabled), resulting in dynamic power ~2.35 mW per transceiver at 1 MHz and 50 pF load. Junction temperature rise remains within safe limits up to 85°C ambient, supported by its 500 mA latch-up immunity rating at 125°C - confirming robust thermal resilience in industrial enclosures.
74ACT11543DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- 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:
- 28-SOIC
74ACT11543DW FAQ
1.How can I place an order for 74ACT11543DW through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11543DW 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 74ACT11543DW reliable?
The price and inventory of 74ACT11543DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11543DW is usually 5 days.
3.What payment methods are accepted for 74ACT11543DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11543DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11543DW?
74ACT11543DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11543DW 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 74ACT11543DW?
For technical support, including 74ACT11543DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11543DW requirements.
6.How does Aetrix verify that 74ACT11543DW is sourced from the original manufacturer or authorized distributors?
All 74ACT11543DW 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 74ACT11543DW meets industry standards.
7.What is the process for return or replacement of 74ACT11543DW?
All 74ACT11543DW units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11543DW, 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 74ACT11543DW part is unused and in its original packaging.
Return procedure for 74ACT11543DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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