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Texas Instruments 74AC11244DWR
- Part No.:
- 74AC11244DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AC11244DWR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,910
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Product details
Overview
74AC11244DWR from Texas Instruments is an octal noninverting 3-state buffer/driver IC designed for memory address and bus driving applications. It features two independent 4-bit sections, each with active-low output-enable (OE) control, 5.5 V absolute max supply rating, ±24 mA output drive at 5 V, and propagation delays as low as 4.5 ns (tPHL) under 5 V operation. It operates across –40°C to 85°C and supports flow-through pinout for optimized PCB layout.
For engineers reviewing the 74AC11244DWR datasheet, 74AC11244DWR pinout, 74AC11244DWR application, or 74AC11244DWR equivalent, key selection considerations include 3-state bus-driving capability, dual 4-bit enable control, SOIC-24 package compatibility, and AC logic performance with TTL-compatible input thresholds.
Technical Context
The 74AC11244DWR implements a dual-section CMOS buffer architecture with separate active-low OE inputs per section (1OE and 2OE), enabling independent 4-bit bus control. Each section drives noninverted A→Y signals and enters high-impedance state when its OE is high.
It uses TI's EPIC™ 1-µm CMOS process, delivering latch-up immunity of 500 mA at 125°C and supporting 3.3 V and 5 V operation with VIH/VIL thresholds scaled to VCC (e.g., VIH = 3.15 V min at VCC = 4.5 V). Its center-pin VCC/GND configuration suppresses high-speed switching noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 5.5 V - Supports mixed-voltage system interfacing and robust 5 V legacy bus operation. |
| Output Drive Current | ±24 mA at VCC = 5 V - Sufficient to drive standard TTL loads and multiple CMOS inputs on shared buses. |
| Propagation Delay | 4.5 ns (tPHL, VCC = 5 V) - Enables reliable operation in high-speed address/data paths up to ~100 MHz toggle rate. |
| 3-State Enable Time | 5.2 ns (tPHZ, VCC = 5 V) - Fast output disable minimizes bus contention during multiplexer or shared-bus transitions. |
| Input Capacitance | 4 pF - Low loading preserves signal integrity and reduces driver burden in fanout-critical designs. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded systems and automotive under-hood auxiliary modules. |
| ESD Rating | ±2000 V HBM - Meets standard IEC 61000-4-2 level for board-level handling and system integration. |
Pinout & Package
74AC11244DWR is housed in a 24-pin SOIC (DW) package (7.5 mm × 15.4 mm, 1.27 mm pitch), with center-aligned VCC (Pin 24) and GND (Pin 12) to minimize ground bounce and power-supply noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent enables for Group 1 (Pins 1–4 Y outputs) and Group 2 (Pins 9–12 Y outputs); tie high for 3-state, low for pass-through. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective 4-bit groups; accept TTL/CMOS logic levels across full VCC range. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive external buses or address lines; high-impedance when OE = high, otherwise replicate A inputs. |
| VCC (Pin 24) | Power supply | Center-placed for symmetrical decoupling; requires local 0.1 µF ceramic capacitor to adjacent GND (Pin 12). |
| GND (Pin 12) | Ground reference | Center-placed to reduce loop inductance; must be connected directly to system ground plane with minimal trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input-to-output signal path runs left-to-right (A→Y) with OE controls at ends - eliminates layer jumps and reduces trace crossovers in dense layouts. |
| Center-pin VCC/GND | VCC (Pin 24) and GND (Pin 12) placed centrally - lowers simultaneous switching noise and improves power integrity for high-fanout buffering. |
| EPIC™ CMOS process | 1-µm implanted CMOS - delivers 500 mA latch-up immunity at 125°C and stable operation across industrial temperature range. |
| Bus-hold circuitry | Not integrated - unused inputs must be externally tied to VCC or GND per SCBA004 to prevent floating-induced oscillation and excess current draw. |
| Low dynamic power | 27 pF typical power-dissipation capacitance per buffer (enabled) - reduces switching current and heat generation in multi-driver configurations. |
Applications
| Memory Address Buffering | Microcontroller Bus Interface |
|---|---|
Use Scenario: Driving 8-bit address lines from a microcontroller to external SRAM or flash memory chips. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating MCU address outputs from memory bus; enabled only during read/write cycles. Use Value: Prevents bus contention during idle states and ensures clean, low-skew address transitions with <9.5 ns tPHL at 5 V. | Use Scenario: Interfacing an 8-bit microcontroller port to a shared peripheral data bus with multiple I/O expanders or ADCs. IC Role / Device Role / Timing Role: Bidirectional bus driver controlled by MCU GPIOs; one section buffers address/control, the other handles data direction. Use Value: Dual OE inputs allow independent timing control of address vs. data phases, eliminating need for external logic or additional drivers. |
| Legacy System Bus Expansion | Industrial PLC Backplane Driver |
Use Scenario: Adding extra address or control lines to an aging ISA or LPC bus without modifying motherboard layout. IC Role / Device Role / Timing Role: Octal buffer inserted between chipset and expansion slot; OE driven by bus grant signal. Use Value: Flow-through pinout allows direct trace routing with no vias; ±24 mA drive sustains signal integrity over 10 cm backplane traces. | Use Scenario: Isolating programmable logic controller CPU module outputs from noisy I/O backplane wiring. IC Role / Device Role / Timing Role: 3-state buffer stage between FPGA/CPU and field-wiring connectors; OE synchronized to scan cycle start. Use Value: 500 mA latch-up immunity and –40°C to 85°C rating ensure reliability in electrically harsh industrial enclosures with thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT125DR | Quad noninverting buffer (4 channels), not octal; identical SOIC-14 package; 5.5 V max, ±24 mA drive, but lacks dual OE and flow-through layout. | Requires two devices for 8-bit coverage; no group-wise enable control; higher board area and interconnect complexity. | Choose only if 4-bit granularity suffices and space constraints favor smaller footprint over functional integration. |
| 74LVC244APW | TSSOP-20 package; 3.3 V only (1.65–3.6 V); lower drive (±24 mA @ 3.3 V); no 5 V tolerance; different pinout (no center VCC/GND). | Not suitable for 5 V systems or industrial temp range; incompatible pin mapping prevents drop-in replacement. | Select only for new 3.3 V designs where voltage scaling and smaller TSSOP size outweigh legacy compatibility needs. |
Compared with SN74ACT125DR and 74LVC244APW, the 74AC11244DWR uniquely combines octal density, dual independent OE control, 5 V tolerance, center-pin power distribution, and flow-through routing - making it the only single-package solution for industrial 5 V bus buffering with layout efficiency and noise resilience.
Availability
74AC11244DWR is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus interfacing, and industrial backplane driver applications requiring stable component supply and long-term industrial temperature support.
Supply support for 74AC11244DWR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74AC11244DWR belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-noise bus interface and memory addressing in industrial control and legacy system upgrades.
FAQ
What is the recommended power supply bypassing strategy for 74AC11244DWR?
Each 74AC11244DWR device requires a minimum 0.1 µF ceramic capacitor placed between Pin 24 (VCC) and Pin 12 (GND), located within 5 mm of the pins. For systems with multiple 74AC11244DWR units, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor per 3–5 devices near the power entry point. This configuration suppresses high-frequency noise due to the center-pin VCC/GND layout and ensures stable 3-state transitions.
Can 74AC11244DWR operate reliably at 3.3 V while interfacing with 5 V logic?
Yes, 74AC11244DWR is fully specified for 3.3 V operation (VCC = 3.3 V ± 0.3 V) and features TTL-compatible input thresholds - VIH = 2.1 V min and VIL = 0.9 V max at 3 V - allowing safe connection to 5 V outputs. However, its outputs swing only to VCC, so 3.3 V outputs cannot directly drive 5 V TTL inputs without level translation. The 74AC11244DWR itself remains undamaged up to 5.5 V VCC.
How should unused inputs be handled on 74AC11244DWR?
All unused inputs on the 74AC11244DWR - including A inputs and OE pins - must be tied to either VCC or GND. Floating inputs cause increased ICC current, potential oscillation, and excessive heating due to CMOS input stage metastability. TI application report SCBA004 mandates this practice; for OE pins, tie to VCC via pullup to guarantee high-impedance state at power-up.
Does 74AC11244DWR support hot-swap or live-insertion into a powered bus?
No, the 74AC11244DWR is not hot-swap rated. Its absolute maximum ratings do not cover powered insertion scenarios, and the lack of bus-fault protection or Ioff (power-off protection) means applying VCC after bus signals may cause latch-up or damage. Always power the 74AC11244DWR before asserting signals on its A or Y pins, and use external series resistors or dedicated hot-swap controllers if live insertion is required.
What is the thermal resistance (θJA) of the 74AC11244DWR in its SOIC-24 package?
The 74AC11244DWR in the DW (SOIC-24) package has a published junction-to-ambient thermal resistance (θJA) of 81°C/W under JEDEC-standard test conditions (1-layer board, 1 in² copper pad). In real-world PCBs with 2+ oz copper and thermal vias under the exposed pad (if present) or adjacent GND planes, actual θJA can improve to ~45–60°C/W, supporting continuous operation at full output load within the –40°C to 85°C ambient range.
74AC11244DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
74AC11244DWR FAQ
1.How can I place an order for 74AC11244DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11244DWR 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 74AC11244DWR reliable?
The price and inventory of 74AC11244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11244DWR is usually 5 days.
3.What payment methods are accepted for 74AC11244DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11244DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11244DWR?
74AC11244DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11244DWR 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 74AC11244DWR?
For technical support, including 74AC11244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11244DWR requirements.
6.How does Aetrix verify that 74AC11244DWR is sourced from the original manufacturer or authorized distributors?
All 74AC11244DWR 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 74AC11244DWR meets industry standards.
7.What is the process for return or replacement of 74AC11244DWR?
All 74AC11244DWR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11244DWR, 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 74AC11244DWR part is unused and in its original packaging.
Return procedure for 74AC11244DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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