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Texas Instruments 74ACT11244DW
- Part No.:
- 74ACT11244DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ACT11244DW.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,669
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Product details
Overview
74ACT11244DW from Texas Instruments is an octal noninverting 3-state buffer/line driver designed for memory address bus driving and clock distribution in high-density digital systems. It features TTL-compatible inputs, ±24 mA output drive at 5 V, 1.5 ns propagation delay typical, and operates from −40°C to 85°C. Its flow-through pinout and center-pin VCC/GND reduce PCB layout complexity and switching noise.
For engineers reviewing the 74ACT11244DW datasheet, 74ACT11244DW pinout, 74ACT11244DW application, or 74ACT11244DW equivalent, key selection criteria include 3-state bus-driving capability, 5-V CMOS logic compatibility, low propagation delay, latch-up immunity (500 mA at 125°C), and SOIC-24 package suitability for industrial control and legacy system upgrades.
Technical Context
The 74ACT11244DW implements two independent 4-bit noninverting buffers, each with dedicated 3-state enable (1OE, 2OE) controlling four outputs (1Y1–1Y4, 2Y1–2Y4). Inputs accept TTL-level voltages (VIL ≤ 0.8 V, VIH ≥ 2 V) while operating on a 4.5–5.5 V supply, ensuring interoperability with legacy TTL and modern CMOS systems.
Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process delivers rail-to-rail output swing, 9 pF power-dissipation capacitance per buffer in 3-state mode, and 27 pF when enabled - critical for minimizing dynamic power in high-frequency address/data buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ACT (Advanced CMOS TTL-compatible), enabling direct interface with 74LS/74F systems without level shifters |
| Supply Voltage | 4.5 V to 5.5 V - supports stable operation across industrial-grade 5-V rails with ±10% tolerance |
| Output Drive | ±24 mA at VOH/VOL - sufficient to drive 50-Ω transmission lines or terminate multiple TTL loads on shared buses |
| Propagation Delay | 1.5 ns to 9.9 ns (tPLH/tPHL) - enables reliable timing in sub-100 MHz address/control paths |
| 3-State Enable Delay | tPZH/tPZL = 1.5 ns to 12.5 ns - ensures clean bus turn-around with minimal contention window |
| Input Capacitance | 4 pF - minimizes loading on upstream drivers and preserves signal integrity in fan-out-critical nodes |
| Latch-Up Immunity | 500 mA at 125°C - meets stringent reliability requirements for industrial and automotive-adjacent applications |
Pinout & Package
74ACT11244DW is housed in a 24-pin SOIC (DW) package (7.5 mm × 15.4 mm body, 1.27 mm pitch), with center-aligned VCC (pins 14, 15) and GND (pins 7, 8, 16, 17) to suppress simultaneous switching noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1Y1–1Y4 outputs | Noninverting buffered outputs of first quad; 3-state controlled by 1OE (pin 20) |
| 9, 10, 11, 12 | 2Y1–2Y4 outputs | Noninverting buffered outputs of second quad; 3-state controlled by 2OE (pin 17) |
| 22, 21, 20, 19 | 1A1–1A4 inputs | Inputs for first quad; TTL-compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) |
| 16, 15, 14, 13 | 2A1–2A4 inputs | Inputs for second quad; electrically identical to 1A1–1A4 |
| 20 | 1OE | Active-low enable for outputs 1Y1–1Y4; drives high-impedance state when HIGH |
| 17 | 2OE | Active-low enable for outputs 2Y1–2Y4; independent control enables split-bus management |
| 7, 8, 16, 17 | GND | Four ground terminals minimize ground bounce and improve noise margin during switching |
| 14, 15 | VCC | Two VCC pins placed centrally reduce power-supply inductance and stabilize core voltage under load |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output pin alignment (e.g., 1A1→1Y1 adjacent) simplifies PCB routing and reduces trace length mismatch |
| Center-pin VCC/GND | Dual VCC (pins 14, 15) and quad GND (pins 7, 8, 16, 17) lower impedance path for high-speed current transients |
| TTL-voltage compatible inputs | Accepts standard 74LS/74F logic thresholds without external biasing, easing mixed-logic-system integration |
| EPIC 1-µm CMOS process | Delivers ACT-speed performance with CMOS power efficiency and robust latch-up immunity (500 mA @ 125°C) |
| 3-state output isolation | Outputs enter high-Z state within 12.5 ns of OE assertion, preventing bus contention in multi-driver configurations |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving 16-bit or wider memory address buses in microprocessor-based industrial controllers where multiple devices share a common address space. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory and peripheral decoders; enables time-multiplexed bus access. Use Value: Flow-through pinout and 1.5 ns min tPLH ensure setup/hold timing margins are preserved across temperature, supporting reliable 20+ MHz bus cycles. |
Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) requiring matched skew and low jitter. IC Role / Device Role / Timing Role: Fan-out buffer replicating and isolating clock signals; dual-enable control allows selective activation of clock domains. Use Value: ±24 mA drive and 9 pF 3-state capacitance minimize clock edge degradation, maintaining <100 ps inter-channel skew across all eight outputs. |
| Legacy System Bus Interface | Industrial I/O Expansion Module |
Use Scenario: Interfacing modern microcontrollers with legacy parallel peripherals (e.g., dot-matrix displays, thermal printers) using 5-V TTL signaling standards. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface between 3.3-V MCU GPIOs and 5-V peripheral data/address lines. Use Value: TTL-compatible inputs eliminate external pull-ups; 5-V tolerant outputs directly drive legacy 5-V loads without external translators. |
Use Scenario: Isolating and buffering digital I/O lines in modular PLC backplanes where hot-swap and fault containment are required. IC Role / Device Role / Timing Role: 3-state-enabled signal conditioner for bidirectional data lanes; enables safe insertion/removal without bus disruption. Use Value: Independent 1OE/2OE controls allow per-lane disable during module reconfiguration, preventing transient glitches on shared backplane lines. |
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 |
|---|---|---|---|
| 74ACT11244DWR | Same die, identical electrical specs; active production status vs. 74ACT11244DW's obsolete status; RoHS-compliant NIPDAU finish | Direct drop-in replacement in new designs; supports automated assembly with verified MSL-1 reflow profile | Select 74ACT11244DWR for volume production requiring TI's current qualified build and tape-and-reel logistics |
| SN74ACT541NSR | Octal buffer with same ACT family specs but single 8-bit enable (OE); different pinout (20-pin SOIC); no dual-enable or flow-through layout | Suitable for simpler bus architectures where grouped enable suffices; lacks independent quad control and optimized PCB routing | Choose SN74ACT541NSR only when board space is constrained and dual-enable functionality is unnecessary |
Compared with 74ACT11244DW, the active 74ACT11244DWR offers identical performance with assured long-term supply and reflow compatibility, while SN74ACT541NSR trades pinout optimization and dual-enable flexibility for smaller footprint - making it viable only in cost- or space-driven legacy replacements where timing and layout constraints are relaxed.
Availability
74ACT11244DW is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment repair, and embedded memory subsystem upgrades requiring stable component supply and documented 5-V TTL/CMOS interoperability.
Supply support for 74ACT11244DW 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 50 years of innovation in industrial, automotive, and communications markets.
The 74ACT11244DW belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, low-noise interfacing between TTL and CMOS systems in mission-critical industrial and computing infrastructure.
FAQ
What is the operating temperature range for the 74ACT11244DW?
The 74ACT11244DW is characterized for operation from −40°C to +85°C, meeting industrial-grade environmental requirements. This range is validated across all electrical parameters including propagation delay, output drive, and 3-state leakage, ensuring reliable performance in factory automation, motor control, and outdoor embedded systems where ambient temperatures fluctuate widely.
Does the 74ACT11244DW support 3.3-V input logic levels?
No, the 74ACT11244DW does not guarantee reliable operation with 3.3-V inputs. Its input thresholds are TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and while a 3.3-V HIGH may exceed VIH, the device is not specified or tested for 3.3-V logic families. For mixed-voltage systems, use level translators or select a 3.3-V–tolerant buffer such as the SN74LVC8T245 instead of the 74ACT11244DW.
What is the maximum continuous output current rating for the 74ACT11244DW?
The 74ACT11244DW supports ±50 mA continuous output current per pin (IO), as defined in its absolute maximum ratings. However, for guaranteed DC performance across temperature, the recommended operating condition specifies ±24 mA (IOL/IOH) - the level at which VOH ≥ 3.94 V and VOL ≤ 0.44 V are maintained at VCC = 4.5 V and TA = 25°C. Exceeding ±24 mA risks violating output voltage specs in real-world conditions.
Is the 74ACT11244DW pin-compatible with the 74ACT11240?
Yes, the 74ACT11244DW is pin-compatible with the 74ACT11240DW, sharing identical SOIC-24 packaging, pinout, and power/ground assignments. The functional difference lies solely in output polarity: the 74ACT11244DW provides noninverting outputs, while the 74ACT11240DW provides inverting outputs. This allows direct substitution when polarity inversion is acceptable or compensated in firmware/hardware design.
What package variants exist for the 74ACT11244 family besides the DW option?
Besides the SOIC-24 (DW) package used in the 74ACT11244DW, the 74ACT11244 family is offered in SSOP-24 (DB), TSSOP-24 (PW), and PDIP-24 (NT) packages. Each variant maintains identical logic function and AC/DC specifications but differs in footprint, thermal resistance, and assembly compatibility - for example, the DB package has lower thermal resistance than DW, while PW offers higher density for space-constrained layouts.
74ACT11244DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
74ACT11244DW FAQ
1.How can I place an order for 74ACT11244DW through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11244DW 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 74ACT11244DW reliable?
The price and inventory of 74ACT11244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11244DW is usually 5 days.
3.What payment methods are accepted for 74ACT11244DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11244DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11244DW?
74ACT11244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11244DW 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 74ACT11244DW?
For technical support, including 74ACT11244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11244DW requirements.
6.How does Aetrix verify that 74ACT11244DW is sourced from the original manufacturer or authorized distributors?
All 74ACT11244DW 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 74ACT11244DW meets industry standards.
7.What is the process for return or replacement of 74ACT11244DW?
All 74ACT11244DW units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11244DW, 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 74ACT11244DW part is unused and in its original packaging.
Return procedure for 74ACT11244DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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