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Texas Instruments 74ACT11245DBLE
- Part No.:
- 74ACT11245DBLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
74ACT11245DBLE.pdf
- Description:
- BUS TRANSCEIVER
- Quantity:
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Inventory:7,000
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Product details
Overview
74ACT11245DBLE from Texas Instruments is an octal bus transceiver IC with 3-state outputs, TTL-voltage-compatible inputs, and flow-through pinout architecture. It operates from –40°C to 85°C at 4.5–5.5 V supply, delivers ±24 mA output drive, and supports bidirectional A↔B data transfer under DIR/OE control for system-level bus isolation.
For engineers reviewing the 74ACT11245DBLE datasheet, 74ACT11245DBLE pinout, 74ACT11245DBLE application, or 74ACT11245DBLE equivalent, this page provides verified functional identity, confirmed 24-pin SSOP package mapping, validated switching timing (tPLH/tPHL ≤ 10 ns), real-world bus isolation use cases, and two technically documented alternative parts for legacy design continuity.
Technical Context
The 74ACT11245DBLE implements asynchronous bidirectional data routing between two 8-bit buses using a single direction-control (DIR) input and global output-enable (OE) logic. Its EPIC CMOS process ensures TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) while maintaining 5-V supply compatibility and 500-mA latch-up immunity.
Switching performance is characterized by tPLH/tPHL ≤ 10 ns (max), tPZH/tPHZ ≤ 13.9 ns (max), and low-noise center-pin VCC/GND placement. The device supports true 3-state output disable (IOZ ≤ ±5 µA) and exhibits 19 pF power-dissipation capacitance when outputs are disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across industrial 5-V rail tolerances. |
| Output Drive | ±24 mA - Sufficient to directly drive standard TTL/CMOS loads without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 10 ns - Enables reliable 50+ MHz bus clocking in synchronous systems. |
| 3-State Leakage | IOZ ≤ ±5 µA - Guarantees high-impedance isolation between buses during OE assertion. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial ambient environments. |
| Input Compatibility | TTL-level VIH/VIL (2 V / 0.8 V) - Interoperates directly with legacy 5-V TTL logic families. |
| Process Technology | EPIC (Enhanced-Performance Implanted CMOS) - Delivers speed/power balance with latch-up immunity. |
Pinout & Package
74ACT11245DBLE uses a 24-pin Shrink Small-Outline Package (SSOP, DB) with 0.65 mm lead pitch, 7.9 mm × 4.4 mm body, and 1.2 mm max height. Pin 1 index is located at top-left corner (Q1 quadrant), with center-aligned VCC (pins 13, 24) and GND (pins 5–8) for reduced switching noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | 8-bit bidirectional data path toward A bus; driven when DIR=H and OE=L. |
| B1–B8 | Input/Output port B | 8-bit bidirectional data path toward B bus; driven when DIR=L and OE=L. |
| DIR | Direction control | Active-High: A→B when DIR=H; B→A when DIR=L; no effect when OE=H. |
| OE | Output enable | Active-Low: enables transceiver; asserts high-impedance state on both ports when OE=H. |
| VCC | Power supply | Pins 13 and 24 provide dual VCC connections to reduce IR drop and improve decoupling. |
| GND | Ground reference | Pins 5–8 form quad-GND array for low-inductance return paths and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Minimizes PCB trace crossovers and layer count in dense bus routing layouts. |
| Center-pin VCC/GND | Reduces simultaneous switching noise (SSN) by shortening high-current loop paths. |
| 500-mA latch-up immunity | Ensures robustness against transient overvoltage events at 125°C junction temperature. |
| EPIC CMOS process | Delivers ACT-series speed (≤10 ns propagation) with CMOS power efficiency (ICC ≤ 80 µA). |
| TTL-input compatibility | Eliminates level-shifter requirements when interfacing with legacy 74LS/74F logic families. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Isolating CPU local bus from peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge enabling hot-swap-capable module insertion without bus contention. Use Value: DIR-controlled direction switching and OE-gated isolation prevent data corruption during module insertion/removal. |
Use Scenario: Extending 8-bit ISA bus signals between motherboard and add-in I/O cards in test equipment. IC Role / Device Role / Timing Role: Level-translating transceiver maintaining signal integrity across 15 cm backplane traces. Use Value: 10 ns max propagation delay and 24 mA drive ensure setup/hold timing margins at 8 MHz ISA clock rates. |
| Microcontroller Memory Expansion | Digital Signal Processor Data Path |
|
Use Scenario: Connecting external SRAM/Flash to 8-bit microcontrollers with limited address/data multiplexing. IC Role / Device Role / Timing Role: Bus buffer isolating MCU data lines from memory access cycles during DMA operations. Use Value: Low 19 pF disabled-state capacitance minimizes loading on MCU I/O pins during idle periods. |
Use Scenario: Routing parallel ADC/DAC data between TMS320C5x DSP and external FIFOs in motor control drives. IC Role / Device Role / Timing Role: High-speed data conduit synchronizing sample transfers with DSP clock domains. Use Value: ±24 mA drive strength sustains signal edge rates across 10 cm PCB traces at 20 MSPS sampling rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT11245DWR | Same logic function, SOIC-24 package (DW), 2.54 mm pitch, 15.4 mm × 7.5 mm body. | Compatible with through-hole or surface-mount wave-solder processes; larger footprint than DB. | Select for legacy board rework, manual assembly, or where SSOP handling infrastructure is unavailable. |
| 74ACT11245PWR | Same logic function, TSSOP-24 package (PW), 0.65 mm pitch, 7.8 mm × 4.4 mm body, 1.2 mm height. | Lower profile and identical pinout to DB; RoHS-compliant green finish with Level-1 MSL rating. | Select for new designs requiring modern packaging, automated pick-and-place compatibility, and moisture-safe handling. |
Compared with 74ACT11245DBLE, the 74ACT11245DWR offers easier hand-soldering but requires more PCB area, while the 74ACT11245PWR provides identical electrical behavior in a thinner, fully RoHS-compliant package optimized for high-volume SMT production.
Availability
74ACT11245DBLE is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and microcontroller memory expansion requiring stable component supply across long-lifecycle programs.
Supply support for 74ACT11245DBLE 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 over 90 years of innovation in industrial, automotive, and communications markets.
The 74ACT11245DBLE belongs to TI's advanced CMOS (ACT) logic family, designed specifically for high-speed, low-noise bidirectional bus interfacing in industrial control and instrumentation systems.
FAQ
What is the operating voltage range for the 74ACT11245DBLE?
The 74ACT11245DBLE operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V industrial power rails while accommodating typical tolerance variations. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings.
Is the 74ACT11245DBLE pin-compatible with other 74ACT11245 variants?
Yes, the 74ACT11245DBLE shares identical pinout and logic functionality with all 74ACT11245 variants including DWR, PWR, and NSR packages. The DB, DW, PW, and NS packages maintain consistent pin numbering and signal assignments, enabling direct substitution where mechanical fit permits.
Does the 74ACT11245DBLE support hot-swapping between buses?
The 74ACT11245DBLE supports controlled hot-swap operation via its OE input: asserting OE=H places both A and B ports in high-impedance state, electrically isolating the buses. This prevents signal contention during live insertion/removal, provided DIR remains stable and supply sequencing meets recommended conditions.
What is the maximum data rate supported by the 74ACT11245DBLE?
Based on its maximum propagation delay of 10 ns and output transition times, the 74ACT11245DBLE reliably supports bus clock rates up to 50 MHz in point-to-point configurations. For longer traces or stubbed topologies, signal integrity validation at the target frequency and load is required.
How does the 74ACT11245DBLE handle power supply noise?
The 74ACT11245DBLE mitigates power supply noise through center-aligned VCC (pins 13, 24) and quad-GND (pins 5–8) placement, which reduces high-frequency current loop inductance. Combined with EPIC CMOS process design, this configuration lowers simultaneous switching noise by up to 40% versus conventional pinouts.
74ACT11245DBLE 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:
- -
74ACT11245DBLE FAQ
1.How can I place an order for 74ACT11245DBLE through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11245DBLE 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 74ACT11245DBLE reliable?
The price and inventory of 74ACT11245DBLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11245DBLE is usually 5 days.
3.What payment methods are accepted for 74ACT11245DBLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11245DBLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11245DBLE?
74ACT11245DBLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11245DBLE 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 74ACT11245DBLE?
For technical support, including 74ACT11245DBLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11245DBLE requirements.
6.How does Aetrix verify that 74ACT11245DBLE is sourced from the original manufacturer or authorized distributors?
All 74ACT11245DBLE 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 74ACT11245DBLE meets industry standards.
7.What is the process for return or replacement of 74ACT11245DBLE?
All 74ACT11245DBLE units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11245DBLE, 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 74ACT11245DBLE part is unused and in its original packaging.
Return procedure for 74ACT11245DBLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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