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Texas Instruments 74ACT11245PW
- Part No.:
- 74ACT11245PW
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT11245PW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,254
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Product details
Overview
74ACT11245PW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous two-way data communication between A and B buses in TTL-voltage-compatible systems. It features direction control (DIR), output enable (OE), flow-through pinout architecture, ±24 mA drive capability at 5 V, and operates across –40°C to 85°C.
For engineers reviewing the 74ACT11245PW datasheet, 74ACT11245PW pinout, 74ACT11245PW application, or 74ACT11245PW equivalent, this device supports bidirectional data routing in industrial backplanes, legacy computing interfaces, and memory-mapped I/O expansion where low-noise switching, latch-up immunity (500 mA typical), and 3-state isolation are critical.
Technical Context
The 74ACT11245PW implements dual 8-bit bidirectional data paths controlled by a single DIR input and globally enabled/disabled via OE. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process delivers TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) while maintaining CMOS power efficiency and noise margin.
Center-pin VCC and GND placements minimize high-speed switching noise; propagation delays range from 1.5 ns (min) to 10 ns (max) for A↔B data transfer, and 1.5–13.9 ns for OE-controlled output enable/disable transitions. Absolute maximum ratings include VCC up to 7 V and continuous output current of ±50 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS logic rails and stable operation under rail tolerance. |
| Drive Strength | ±24 mA - Sufficient to directly drive standard 50 Ω transmission lines or multiple TTL inputs without external buffers. |
| Propagation Delay (tPLH/tPHL) | 1.5 ns (min) to 10 ns (max) - Enables high-speed bus arbitration in real-time control and data acquisition systems. |
| 3-State Leakage (IOZ) | ±0.5 µA (typ) - Guarantees robust bus isolation during disable mode, preventing signal contention in shared-bus architectures. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial environments including programmable logic controllers and motor drive interfaces. |
| Input Capacitance (Ci) | 4 pF - Minimizes loading on upstream drivers, preserving signal integrity in high-frequency parallel bus designs. |
| Latch-Up Immunity | 500 mA typical at 125°C - Provides inherent resilience against transient-induced latch-up in noisy industrial power domains. |
Pinout & Package
TSSOP-24 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, thin profile suitable for space-constrained PCBs. Pin 1 marked with dot; pinout follows flow-through architecture for optimal trace routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | 8-bit bidirectional data path connected to local bus or microcontroller peripheral interface. |
| B1–B8 | Input/Output port B | 8-bit bidirectional data path connected to remote bus, memory bank, or expansion slot. |
| DIR | Direction control input | High = A→B data flow; Low = B→A data flow - enables flexible bus topology reconfiguration. |
| OE | Output enable input | Low = active transceiver; High = all A/B outputs in high-impedance state - isolates buses during arbitration or standby. |
| VCC | Power supply | Two center pins (13, 24) reduce IR drop and improve decoupling effectiveness for high-speed switching. |
| GND | Ground reference | Four ground pins (5, 6, 7, 8) lower ground impedance and suppress simultaneous switching noise (SSN). |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout architecture | Enables straight-line PCB trace routing between A and B ports, reducing crosstalk and stub length in high-speed parallel buses. |
| Center-pin VCC and quad-GND layout | Minimizes power/ground loop inductance and suppresses high-frequency noise during 10 ns-level switching transitions. |
| TTL-voltage compatible inputs | Accepts standard 0.8 V / 2.0 V logic thresholds - eliminates level-shifting requirements when interfacing with legacy 5 V microcontrollers. |
| EPIC 1-µm CMOS process | Delivers 500 mA latch-up immunity and low ICC (8 µA typ) - enhances reliability in electrically harsh industrial settings. |
| 3-state output control | Independent OE pin disables both A and B ports simultaneously - simplifies bus arbitration logic and prevents contention. |
Applications
| Industrial Backplane Interface | Legacy Computing Expansion |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in modular PLC chassis. IC Role / Device Role / Timing Role: Octal bus transceiver managing A-B data routing under DIR control and isolated via OE during card hot-swap. Use Value: Flow-through pinout reduces trace skew; ±24 mA drive ensures signal integrity across 15 cm backplane runs at 20 MHz. |
Use Scenario: Interfacing ISA-bus peripherals (e.g., DACs, ADCs) with 80x86-based embedded controllers. IC Role / Device Role / Timing Role: Level-translating transceiver enabling TTL-compatible communication between 5 V ISA bus and local microcontroller bus. Use Value: TTL-input compatibility eliminates external level shifters; 10 ns max propagation delay meets ISA timing budgets. |
| Memory-Mapped I/O Bridge | Motor Drive Control Bus |
|
Use Scenario: Connecting FPGA-configured peripheral registers to microcontroller address/data bus in motion control systems. IC Role / Device Role / Timing Role: Direction-controlled data conduit allowing CPU read/write access to FPGA register banks via shared address strobes. Use Value: DIR-driven A↔B routing enables compact register mapping; 4 pF input capacitance preserves setup/hold timing margins. |
Use Scenario: Isolating microcontroller GPIOs from high-noise motor driver ICs in servo amplifier modules. IC Role / Device Role / Timing Role: 3-state buffer enabling safe write-only command transmission from MCU to driver ICs during fault conditions. Use Value: OE-controlled isolation prevents feedback coupling; 500 mA latch-up immunity withstands ESD events near motor windings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT245PW | Same logic function and pinout; identical electrical specs except slightly higher ICC (10 µA typ vs. 8 µA). | No functional difference; used interchangeably in new designs where TI's ACT245 is preferred in inventory. | Select 74ACT245PW if sourcing flexibility across TI's ACT-family stock is prioritized over minor quiescent current reduction. |
| SN74LVC245APWR | Lower VCC range (1.65–3.6 V); 32 mA drive; LVTTL-compatible inputs; not TTL-voltage compatible. | Requires level-shifting for 5 V systems; suited for mixed-voltage 3.3 V/5 V interfaces or battery-powered designs. | Choose SN74LVC245APWR only when migrating to 3.3 V logic domains or needing higher drive strength at reduced voltage. |
Compared with 74ACT11245PW, the 74ACT245PW offers identical functionality with negligible quiescent current trade-off, while the SN74LVC245APWR requires system-level voltage adaptation but enables lower-power 3.3 V operation - making the 74ACT11245PW optimal for legacy 5 V industrial bus isolation.
Availability
74ACT11245PW is available at Aetrix Electronics and suitable for industrial backplanes, legacy computing expansion, and memory-mapped I/O interfaces requiring stable component supply, long-lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for 74ACT11245PW 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 heritage in industrial-grade logic families.
The 74ACT11245PW belongs to TI's Advanced CMOS Logic (ACT) product line, engineered for high-speed, noise-immune bus interfacing in demanding industrial and computing applications.
FAQ
What is the operating temperature range for the 74ACT11245PW?
The 74ACT11245PW is characterized for operation from –40°C to +85°C. This industrial temperature range ensures reliable performance in programmable logic controllers, motor drives, and factory automation equipment exposed to wide ambient thermal swings. The device maintains specified propagation delay, drive strength, and 3-state leakage across this full range.
Does the 74ACT11245PW support 3.3 V logic levels?
No, the 74ACT11245PW is designed for 5 V operation with VCC specified from 4.5 V to 5.5 V. Its inputs are TTL-voltage compatible (VIH = 2.0 V min, VIL = 0.8 V max), but it does not meet LVTTL or LVCMOS 3.3 V thresholds. Using it with 3.3 V signals risks unreliable switching; for 3.3 V systems, consider the SN74LVC245APWR instead.
How does the flow-through architecture of the 74ACT11245PW benefit PCB layout?
The flow-through pinout places A1–A8 on one side and B1–B8 on the opposite side, aligned linearly (e.g., A1 ↔ B1, A2 ↔ B2). This allows direct, short, parallel traces between transceiver and connected buses - minimizing stubs, differential skew, and crosstalk in high-speed parallel interfaces such as ISA or custom backplanes.
What is the significance of center-pin VCC and quad-GND in the 74ACT11245PW TSSOP package?
Placing VCC at pins 13 and 24, and GND at pins 5, 6, 7, and 8, reduces power/ground loop inductance and improves high-frequency decoupling. This configuration directly lowers simultaneous switching noise (SSN) during fast 10 ns transitions - a key factor in maintaining signal integrity in noise-sensitive industrial control systems.
Can the 74ACT11245PW be used as a unidirectional buffer?
Yes - by holding DIR at a fixed logic level (e.g., DIR = HIGH for A→B only) and controlling data flow via OE, the 74ACT11245PW functions as an octal unidirectional buffer. This mode simplifies interface design in applications like address latching or peripheral enable signaling where bidirectional operation is unnecessary.
74ACT11245PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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:
- 24-TSSOP
74ACT11245PW FAQ
1.How can I place an order for 74ACT11245PW through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11245PW 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 74ACT11245PW reliable?
The price and inventory of 74ACT11245PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11245PW is usually 5 days.
3.What payment methods are accepted for 74ACT11245PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11245PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11245PW?
74ACT11245PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11245PW 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 74ACT11245PW?
For technical support, including 74ACT11245PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11245PW requirements.
6.How does Aetrix verify that 74ACT11245PW is sourced from the original manufacturer or authorized distributors?
All 74ACT11245PW 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 74ACT11245PW meets industry standards.
7.What is the process for return or replacement of 74ACT11245PW?
All 74ACT11245PW units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11245PW, 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 74ACT11245PW part is unused and in its original packaging.
Return procedure for 74ACT11245PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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