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Texas Instruments 74ACT11244DBR
- Part No.:
- 74ACT11244DBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ACT11244DBR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,282
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Product details
Overview
74ACT11244DBR from Texas Instruments is an octal noninverting 3-state buffer/line driver in a 24-pin SSOP package, designed for memory address driving and bus interfacing. It operates from −40°C to 85°C with 4.5–5.5 V supply, delivers ±24 mA output drive, supports TTL-compatible inputs, and features flow-through pinout for optimized PCB layout.
For engineers reviewing the 74ACT11244DBR datasheet, 74ACT11244DBR pinout, 74ACT11244DBR application, or 74ACT11244DBR equivalent, key selection criteria include 3-state bus-driving capability, low propagation delay (≤9.9 ns), high noise immunity (500-mA latch-up rating), and compatibility with legacy 74ACT logic families in space-constrained SSOP layouts.
Technical Context
The 74ACT11244DBR implements two independent 4-bit noninverting buffers, each with dedicated 3-state enable (1OE, 2OE) controlling four outputs (1Y1–1Y4, 2Y1–2Y4). Its EPIC CMOS process ensures TTL-level input compatibility while delivering ACT-series speed and drive strength.
Center-placed VCC and GND pins minimize switching noise; the flow-through architecture aligns inputs on one side and outputs on the opposite, reducing trace crossovers. Absolute maximum ratings include −0.5 V to 6 V supply and ±50 mA output current, supporting robust operation in industrial bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V logic rails with margin for ripple and drop. |
| Output Drive | ±24 mA - Sufficient to drive 50-Ω transmission lines or multiple TTL loads without external buffering. |
| Propagation Delay | ≤9.9 ns (tPLH/tPHL) - Enables reliable timing in high-speed address/data buses up to ~100 MHz. |
| 3-State Enable Delay | ≤12.5 ns (tPZH/tPZL) - Guarantees clean bus release and acquisition during multiplexed access cycles. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Interoperates directly with legacy 74LS and microcontroller GPIOs. |
| Latch-Up Immunity | 500 mA at 125°C - Meets stringent industrial reliability requirements under transient overcurrent stress. |
| Operating Temperature | −40°C to +85°C - Qualified for extended industrial ambient conditions without derating. |
Pinout & Package
74ACT11244DBR uses a 24-pin Shrink Small-Outline Package (SSOP, DB), 0.65 mm pitch, 7.8 mm × 4.4 mm body, 1.2 mm max height, JEDEC MO-150 compliant. Pin 1 index located at top-left corner (Q1 quadrant in tape).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 9–12 | Outputs (1Y1–1Y4, 2Y1–2Y4) | Noninverting buffered outputs with 3-state control; drive bus lines or memory address latches. |
| 13, 17 | Output Enables (1OE, 2OE) | Active-low enables per 4-bit section; allows independent bus segment control without contention. |
| 14–16, 20–23 | Inputs (2A1–2A4, 1A1–1A4) | TTL-compatible data inputs; flow-through arrangement simplifies layer routing and reduces stub length. |
| 5–8, 18–19, 24 | GND / VCC | Four GND pins (5,6,7,8), two VCC pins (18,19), and one VCC (24) - distributed power/ground lowers simultaneous switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output alignment minimizes PCB trace length and crosstalk in dense address/data routing. |
| Center-placed VCC/GND | Dual VCC (pins 18,19,24) and quad GND (pins 5–8) reduce ground bounce and supply impedance. |
| EPIC CMOS process | 1-μm technology delivers ACT-speed performance with lower power than bipolar equivalents. |
| 500-mA latch-up immunity | Robust against ESD-induced latch-up in industrial environments without requiring external protection. |
| TTL-input compatibility | Direct interface with 74LS, microcontrollers, and FPGAs without level-shifting circuitry. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/Flash memory. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory load capacitance. Use Value: Propagation delay ≤9.9 ns ensures setup/hold timing margins at 20-MHz bus clocks; flow-through pinout eliminates layer jumps. |
Use Scenario: Bidirectional data bus isolation between FPGA and peripheral ICs sharing common I/O lines. IC Role / Device Role / Timing Role: Dual-section 3-state driver enabling time-multiplexed read/write direction control. Use Value: Independent 1OE/2OE pins allow staggered enable timing to prevent bus contention during state transitions. |
| Industrial Control Backplane | Legacy System Bus Extension |
|
Use Scenario: Extending ISA or VME-style parallel control bus across multi-board chassis with signal integrity constraints. IC Role / Device Role / Timing Role: High-drive line driver compensating for long traces and multiple receiver inputs. Use Value: ±24 mA output drive sustains logic levels across 15-cm 50-Ω traces; 500-mA latch-up rating withstands field-induced transients. |
Use Scenario: Retrofitting modern microcontrollers into aging instrumentation systems using 74ACT-compatible logic. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74F/74AS drivers in legacy backplane designs. Use Value: Identical pinout and TTL-compatible inputs enable direct substitution without schematic or layout changes. |
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 |
|---|---|---|---|
| 74ACT11240DBR | Inverting outputs (vs. noninverting in 74ACT11244DBR); identical pinout, timing, and drive specs. | Required where signal polarity inversion is needed in address/data path (e.g., complemented bus addressing). | Select 74ACT11240DBR only when functional inversion is explicitly required; otherwise 74ACT11244DBR is preferred for direct buffering. |
| SN74ACT541DBR | Single 8-bit section (vs. dual 4-bit); same 24-pin SSOP package, but OE shared across all 8 outputs. | Suitable for simpler unidirectional bus drivers where per-section enable control is unnecessary. | Choose SN74ACT541DBR for cost-sensitive single-enable applications; 74ACT11244DBR offers finer-grained bus segmentation. |
Compared with 74ACT11240DBR and SN74ACT541DBR, the 74ACT11244DBR uniquely provides dual independent 4-bit sections with separate enables-enabling selective activation of address sub-buses or split data lanes without added logic or layout complexity.
Availability
74ACT11244DBR is available at Aetrix Electronics and suitable for industrial control backplanes, memory subsystems, and legacy bus extension requiring stable component supply, long-term lifecycle support, and RoHS-compliant SSOP packaging.
Supply support for 74ACT11244DBR 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 industry-standard logic families.
The 74ACT11244DBR belongs to TI's advanced CMOS (ACT) logic portfolio, engineered for high-speed, low-noise bus interfacing in industrial and computing systems where reliability and pin compatibility are critical.
FAQ
What is the operating voltage range for the 74ACT11244DBR?
The 74ACT11244DBR operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V logic systems while providing sufficient margin for supply ripple and droop. Operation outside this range may result in undefined behavior or damage, as absolute maximum ratings cap VCC at 6 V.
Does the 74ACT11244DBR support TTL-level input signals?
Yes, the 74ACT11244DBR features TTL-voltage compatible inputs, with VIH specified at 2 V minimum and VIL at 0.8 V maximum. This allows direct connection to legacy 74LS devices, microcontroller GPIOs, and other TTL-family sources without level-shifting circuitry-maintaining signal integrity and reducing BOM count.
How many independent 3-state sections does the 74ACT11244DBR contain?
The 74ACT11244DBR contains two independent 4-bit 3-state sections: Section 1 (inputs 1A1–1A4, outputs 1Y1–1Y4, enable 1OE) and Section 2 (inputs 2A1–2A4, outputs 2Y1–2Y4, enable 2OE). This architecture enables selective bus segmentation and avoids contention in multi-peripheral systems.
What is the maximum propagation delay of the 74ACT11244DBR at 5 V?
At VCC = 5 V and TA = 25°C, the 74ACT11244DBR exhibits a maximum propagation delay (tPLH/tPHL) of 9.9 ns. Over the full −40°C to 85°C range, delay remains within guaranteed limits per the recommended operating conditions, supporting reliable timing in 20-MHz+ address/data paths.
Is the 74ACT11244DBR pin-compatible with other packages in the same family?
No-the 74ACT11244DBR is specific to the 24-pin SSOP (DB) package. While the 74ACT11244DW (SOIC) and 74ACT11244PWR (TSSOP) share identical logic and pin functions, their footprints differ significantly. Mechanical dimensions, pitch (0.65 mm for DB vs. 1.27 mm for DW), and thermal characteristics are not interchangeable without PCB redesign.
74ACT11244DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-SSOP (0.209", 5.30mm 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
74ACT11244DBR FAQ
1.How can I place an order for 74ACT11244DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11244DBR 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 74ACT11244DBR reliable?
The price and inventory of 74ACT11244DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11244DBR is usually 5 days.
3.What payment methods are accepted for 74ACT11244DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11244DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11244DBR?
74ACT11244DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11244DBR 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 74ACT11244DBR?
For technical support, including 74ACT11244DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11244DBR requirements.
6.How does Aetrix verify that 74ACT11244DBR is sourced from the original manufacturer or authorized distributors?
All 74ACT11244DBR 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 74ACT11244DBR meets industry standards.
7.What is the process for return or replacement of 74ACT11244DBR?
All 74ACT11244DBR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11244DBR, 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 74ACT11244DBR part is unused and in its original packaging.
Return procedure for 74ACT11244DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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