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Texas Instruments 74ACT11244NSR
- Part No.:
- 74ACT11244NSR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74ACT11244NSR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,062
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Product details
Overview
74ACT11244NSR from Texas Instruments is an octal noninverting 3-state buffer/line driver designed for memory address and bus driving applications. It features TTL-compatible inputs, 5-V supply operation (4.5–5.5 V), ±24-mA output drive, 1.5–9.9-ns propagation delay, and flow-through pinout for optimized PCB layout.
For engineers reviewing the 74ACT11244NSR datasheet, 74ACT11244NSR pinout, 74ACT11244NSR application, or 74ACT11244NSR equivalent, key selection criteria include 3-state bus isolation capability, high-speed switching noise suppression via center-pin VCC/GND, EPIC CMOS process reliability, and compatibility with legacy 5-V TTL logic systems.
Technical Context
The 74ACT11244NSR implements two independent 4-bit noninverting buffer sections (1A1–1A4 → 1Y1–1Y4; 2A1–2A4 → 2Y1–2Y4), each controlled by a dedicated 3-state enable input (1OE, 2OE). Its EPIC 1-μm CMOS process delivers latch-up immunity of 500 mA at 125°C and supports −40°C to +85°C industrial operation.
Input thresholds are TTL-voltage compatible (VIL = 0.8 V max, VIH = 2.0 V min), enabling direct interfacing with standard TTL outputs. The flow-through architecture places inputs on one side and outputs on the opposite side, minimizing trace crossovers and signal integrity degradation in dense bus routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across standard 5-V rail tolerances and brown-out resilience. |
| Output Drive | ±24 mA - sufficient to drive 50-Ω transmission lines or multiple TTL loads without external buffering. |
| Propagation Delay | 1.5–9.9 ns - enables reliable operation in high-speed address/data buses up to ~100 MHz clock domains. |
| 3-State Enable Time | tPZL/tPHZ = 1.5–12.5 ns - fast output disable/enable supports dynamic bus arbitration and hot-swap readiness. |
| Input Capacitance | 4 pF - low loading minimizes fanout-induced timing skew in parallel bus configurations. |
| Power Dissipation Cap. | 27 pF (enabled), 9 pF (disabled) - quantifies dynamic power consumption per buffer under 1-MHz toggle conditions. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control, instrumentation, and telecom infrastructure. |
Pinout & Package
74ACT11244NSR is packaged in a 24-pin SSOP (Shrink Small-Outline Package) with 0.64-mm lead pitch, JEDEC MO-150 compliant, and marked "AT244" on top. Dimensions: 8.2 mm × 5.3 mm × 1.95 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y1–1Y4, 2Y1–2Y4 (Pins 1–4, 9–12) | Noninverting buffered outputs | Active-high outputs enabled only when respective OE is low; high-impedance state otherwise for bus sharing. |
| 1A1–1A4, 2A1–2A4 (Pins 22–20, 16–13) | Data inputs | TTL-compatible inputs accept 0.8 V / 2.0 V thresholds; no pull-up required for open-collector source interfacing. |
| 1OE, 2OE (Pins 24, 17) | Independent 3-state enables | Active-low control per 4-bit section allows selective bus segment activation without global contention. |
| VCC (Pins 24, 19, 18, 17) | Power supply | Four distributed VCC pins reduce simultaneous switching noise and improve PSRR in high-density layouts. |
| GND (Pins 10, 11, 12, 13) | Ground reference | Four GND pins provide low-inductance return paths and support clean signal integrity for all 8 outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left/right edges and outputs on opposite side eliminate layer jumps and reduce crosstalk in 8-bit parallel routing. |
| Center-pin VCC/GND | Dual VCC and dual GND pins placed centrally suppress ground bounce and supply droop during high-frequency switching. |
| EPIC CMOS process | 1-μm implanted CMOS delivers 500-mA latch-up immunity and stable parametric performance over temperature and voltage. |
| TTL-input compatibility | Accepts standard TTL output levels directly-no level-shifting circuitry needed when interfacing with legacy 74LS/74F families. |
| 3-State bus isolation | Independent OE controls allow interleaved access to shared data/address buses without contention or bus turnaround delays. |
Applications
| Memory Address Buffering | Parallel Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit or wider memory address buses in microprocessor-based systems with multiple RAM/ROM chips. IC Role / Device Role / Timing Role: Noninverting buffer isolating CPU address lines from capacitive load of multiple memory devices while maintaining setup/hold timing margins. Use Value: Prevents address skew and decoding errors caused by excessive trace capacitance, supporting reliable access to ≥256 KB address space. | Use Scenario: Bidirectional data bus conditioning between microcontroller peripherals and external I/O expanders or display controllers. IC Role / Device Role / Timing Role: 3-state line driver enabling time-multiplexed read/write cycles on shared 8-bit data bus with precise enable timing control. Use Value: Eliminates need for discrete transceivers; independent OE pins allow per-segment arbitration without full-bus reset. |
| Clock Distribution Network | Industrial Control Backplane Driver |
Use Scenario: Fanout of system clock or strobe signals to multiple synchronous logic blocks (e.g., counters, FIFOs, PLDs). IC Role / Device Role / Timing Role: Low-skew, noninverting buffer with matched tPLH/tPHL ensuring deterministic edge alignment across 8 destinations. Use Value: Maintains <100-ps inter-output skew critical for setup-time compliance in multi-chip synchronous designs. | Use Scenario: Interfacing PLC CPU modules with field I/O racks over rigid backplane wiring with long trace runs. IC Role / Device Role / Timing Role: Robust line driver providing ±24-mA drive into unterminated 50-Ω traces and noise-immune TTL-level signaling. Use Value: Ensures reliable signal integrity over 30-cm backplane runs at 10-MHz update rates without termination resistors. |
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 |
|---|---|---|---|
| SN74ACT244N | Same ACT family, identical 24-pin PDIP package; slightly higher ICC (max 80 μA vs. 1 mA typical), same timing specs. | Preferred where through-hole assembly or legacy DIP footprint is required; lacks SSOP thermal advantages. | Select SN74ACT244N for manual prototyping or repair of existing DIP-based boards. |
| 74LVC244APW | Lower voltage (1.65–3.6 V), smaller TSSOP-20 package; 32-mA drive but incompatible with 5-V TTL inputs without level shift. | Suitable for modern low-voltage mixed-signal systems; not drop-in replaceable due to voltage and pin count mismatch. | Choose 74LVC244APW only in new 3.3-V designs with careful I/O voltage planning. |
Compared with SN74ACT244N and 74LVC244APW, the 74ACT11244NSR uniquely combines 5-V TTL compatibility, SSOP thermal efficiency, and independent dual-OE control-making it optimal for industrial upgrades requiring pin-compatible 5-V bus buffering without redesign.
Availability
74ACT11244NSR is available at Aetrix Electronics and suitable for memory subsystem design, industrial backplane interfacing, and legacy 5-V logic consolidation requiring stable component supply and long-term lifecycle support.
Supply support for 74ACT11244NSR 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 74ACT11244NSR belongs to TI's advanced CMOS (ACT) logic family, engineered for high-speed, low-noise 5-V digital interfacing in mission-critical industrial and computing infrastructure.
FAQ
What is the operating voltage range for the 74ACT11244NSR?
The 74ACT11244NSR operates over a supply voltage range of 4.5 V to 5.5 V. This specification ensures compatibility with standard 5-V power rails while accommodating typical tolerance variations. The device is not rated for 3.3-V operation, and applying voltages outside this range may cause permanent damage or undefined behavior. All recommended electrical characteristics-including VOH, VOL, and timing-are validated within this window.
Does the 74ACT11244NSR support TTL-level input signals?
Yes, the 74ACT11244NSR features TTL-voltage compatible inputs with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V. This allows direct connection to legacy 74LS, 74F, and other TTL-family outputs without level-shifting circuitry. Input thresholds remain stable across the full −40°C to +85°C temperature range, making the 74ACT11244NSR suitable for industrial environments where mixed-logic interfacing is required.
How many independent 3-state control inputs does the 74ACT11244NSR have?
The 74ACT11244NSR has two independent 3-state enable inputs: 1OE (pin 24) controls outputs 1Y1–1Y4, and 2OE (pin 17) controls outputs 2Y1–2Y4. This dual-enable architecture allows segmented bus control-for example, enabling only the lower byte of an address bus while holding the upper byte in high-impedance. Neither enable affects the other section, and both must be low for their respective outputs to drive.
What package type is used for the 74ACT11244NSR?
The 74ACT11244NSR uses a 24-pin Shrink Small-Outline Package (SSOP) with JEDEC MO-150 compliance and 0.64-mm lead pitch. Its dimensions are 8.2 mm × 5.3 mm × 1.95 mm. This surface-mount package offers superior thermal performance and board density compared to legacy DIP variants, while maintaining mechanical compatibility with automated pick-and-place equipment used in high-volume manufacturing.
Is the 74ACT11244NSR pin-compatible with the SN74ACT244N?
No, the 74ACT11244NSR is not pin-compatible with the SN74ACT244N. While both are octal 3-state buffers in the ACT family, the 74ACT11244NSR uses a 24-pin SSOP package with dual OE inputs and distributed VCC/GND pins, whereas the SN74ACT244N uses a 20-pin PDIP package with shared OE and different pin mapping. Direct replacement would require PCB redesign. Always verify pin functions using the official logic diagram before substitution.
74ACT11244NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SO
74ACT11244NSR FAQ
1.How can I place an order for 74ACT11244NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11244NSR 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 74ACT11244NSR reliable?
The price and inventory of 74ACT11244NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11244NSR is usually 5 days.
3.What payment methods are accepted for 74ACT11244NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11244NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11244NSR?
74ACT11244NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11244NSR 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 74ACT11244NSR?
For technical support, including 74ACT11244NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11244NSR requirements.
6.How does Aetrix verify that 74ACT11244NSR is sourced from the original manufacturer or authorized distributors?
All 74ACT11244NSR 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 74ACT11244NSR meets industry standards.
7.What is the process for return or replacement of 74ACT11244NSR?
All 74ACT11244NSR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11244NSR, 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 74ACT11244NSR part is unused and in its original packaging.
Return procedure for 74ACT11244NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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