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Texas Instruments 74AC11244DBR
- Part No.:
- 74AC11244DBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74AC11244DBR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,171
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Product details
Overview
74AC11244DBR from Texas Instruments is an octal noninverting 3-state buffer/driver IC designed for memory address and bus driving applications, featuring dual 4-bit sections with independent active-low output-enable (OE) controls, ±24 mA output drive at 5 V, 4.5 ns typical propagation delay (VCC = 5 V), and operation across –40°C to 85°C.
For engineers reviewing the 74AC11244DBR datasheet, 74AC11244DBR pinout, 74AC11244DBR application, or 74AC11244DBR equivalent, this page delivers verified electrical specs, DB-package terminal mapping, flow-through layout advantages, latch-up immunity (500 mA @ 125°C), and validated alternatives for bus interface and address buffering designs.
Technical Context
The 74AC11244DBR implements two independent 4-bit buffer sections in a single 24-pin SSOP package, each with dedicated OE control (1OE and 2OE), enabling selective 3-state management of A→Y signal paths without inversion. Its EPIC™ 1-µm CMOS process ensures rail-to-rail input compatibility and low-noise switching.
Center-placed VCC and GND pins (pins 13/24 and 5–8) reduce simultaneous switching noise, while flow-through pinout (A inputs on one side, Y outputs on opposite side) simplifies PCB routing for high-density memory and bus systems. The device requires external pull-up on OE during power sequencing to guarantee defined high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V TTL-compatible operation. |
| Output Drive | ±24 mA at VCC = 5 V - drives standard TTL loads and sustains signal integrity across 50 Ω transmission lines. |
| Propagation Delay | 4.5 ns typical (tPLH/tPHL, VCC = 5 V) - enables reliable timing in high-speed address latching and clock distribution up to ~100 MHz. |
| 3-State Enable Time | 5.2 ns typical (tPHZ, VCC = 5 V) - ensures fast bus release for time-critical multiplexed data paths. |
| Input Capacitance | 4 pF - minimizes loading on upstream drivers and preserves edge rate in fan-out-heavy configurations. |
| Latch-Up Immunity | 500 mA typical @ 125°C - meets stringent industrial reliability requirements without external current limiting. |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial and automotive under-hood auxiliary logic. |
Pinout & Package
74AC11244DBR uses a 24-pin Shrink Small-Outline Package (SSOP, DB), 0.65 mm pitch, 7.9 mm × 4.5 mm body, 1.2 mm max height, JEDEC MO-153 compliant, with exposed metal not present (non-thermally enhanced).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y1–1Y4, 2Y1–2Y4 | Buffered Outputs (Group 1 & 2) | Noninverted 3-state outputs; high-impedance when respective OE is high - directly connect to shared bus or address lines. |
| 1A1–1A4, 2A1–2A4 | Input Signals (Group 1 & 2) | CMOS-compatible inputs accepting 0–VCC logic levels; require tie-high/tie-low if unused per SCBA004. |
| 1OE, 2OE | Active-Low Output Enables | Enable/disable corresponding Y-group independently; must be pulled up to VCC for safe power-up state. |
| VCC (Pins 13, 24) | Power Supply | Dual center-placed VCC pins reduce IR drop and supply noise coupling between buffer groups. |
| GND (Pins 5–8) | Ground Reference | Four adjacent GND pins provide low-inductance return path for all eight outputs - critical for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs (A) and outputs (Y) placed on opposite sides - eliminates layer jumps and reduces trace crosstalk in dense PCB layouts. |
| Center-placed VCC/GND | VCC at pins 13/24 and GND at pins 5–8 - lowers ground bounce and improves PSRR for high-speed switching. |
| EPIC™ 1-µm CMOS process | Enables 500 mA latch-up immunity and rail-to-rail VIH/VIL thresholds - eliminates need for external clamping in noisy environments. |
| Independent dual OE control | 1OE and 2OE allow asynchronous enable/disable of two 4-bit channels - supports interleaved memory bank access or split-bus arbitration. |
| Low dynamic power dissipation | 27 pF typical Cpd per buffer (enabled), 9 pF (disabled) - reduces total system power in burst-mode address generation. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM/Flash memory array with minimal skew and noise. IC Role / Device Role / Timing Role: Noninverting octal buffer providing level translation, fan-out expansion, and 3-state isolation during memory read/write cycles. Use Value: Flow-through pinout and dual OE support precise timing control across address segments, reducing setup/hold violations by >1.5 ns vs. conventional layouts. |
Use Scenario: Isolating bidirectional data bus between FPGA and peripheral ASIC in a modular backplane system. IC Role / Device Role / Timing Role: Direction-controlled bus driver using separate OE signals to manage data flow direction without external logic. Use Value: ±24 mA drive strength maintains signal integrity over 10 cm traces; center GND/VCC pins suppress common-mode noise induced by concurrent switching. |
| Industrial PLC I/O Expansion | Legacy System Bus Extension |
|
Use Scenario: Expanding parallel I/O port of ARM Cortex-M7 controller to interface with discrete sensors and actuators in factory automation. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer for TTL-compatible control signals operating at –40°C to 85°C ambient. Use Value: 500 mA latch-up immunity prevents field failures due to ESD transients or ground bounce in electrically noisy plant-floor environments. |
Use Scenario: Replacing obsolete 74LS244 in retro-computing motherboard upgrades requiring higher speed and lower power. IC Role / Device Role / Timing Role: Drop-in functional replacement with identical pinout and logic behavior, but AC-series performance and CMOS input thresholds. Use Value: 4.5 ns propagation delay cuts address decode latency by 60% vs. LS family; 5 V supply compatibility avoids redesign of existing power rails. |
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 |
|---|---|---|---|
| SN74AC244N | Same AC logic family, 24-pin PDIP (NT) package only; no SSOP option; slightly higher tPLH (4.9 ns typ) at 5 V. | Preferred for through-hole prototyping or legacy DIP-based systems; lacks DB package's space efficiency and thermal performance. | Select SN74AC244N only when board layout mandates DIP footprint or hand-soldering is required. |
| 74LVC244APW | Lower voltage operation (1.65–3.6 V), 24-pin TSSOP (PW); 3.5 ns tPLH at 3.3 V; IO = ±24 mA; not 5 V tolerant on inputs. | Suitable for modern 3.3 V embedded systems; incompatible with 5 V buses unless level-shifted; smaller 4.4 mm × 2.6 mm PW package. | Choose 74LVC244APW for new 3.3 V designs prioritizing size and speed; avoid in mixed 5 V/3.3 V systems without translation. |
Compared with SN74AC244N and 74LVC244APW, the 74AC11244DBR uniquely combines 5 V tolerance, SSOP space savings, center-power pin architecture, and industrial temperature range - making it optimal for retrofitting legacy 5 V bus systems where layout density and noise immunity are critical.
Availability
74AC11244DBR is available at Aetrix Electronics and suitable for memory address buffering, industrial PLC I/O expansion, and legacy bus extension applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for 74AC11244DBR 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, precision, and industrial-grade qualification.
The 74AC11244DBR belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-noise bus interface and memory subsystem applications in demanding industrial and computing environments.
FAQ
What is the recommended power-up sequence for 74AC11244DBR to ensure outputs remain in high-impedance state?
TI specifies that OE pins must be held high during power-up to guarantee 3-state behavior. For 74AC11244DBR, tie 1OE and 2OE to VCC via ≥10 kΩ pull-up resistors - this satisfies the minimum current-sinking requirement and prevents bus contention before system initialization completes. Do not leave OE floating.
Can 74AC11244DBR operate reliably at 3.3 V supply voltage?
Yes, 74AC11244DBR is fully specified down to 3 V supply (per recommended operating conditions). At VCC = 3.3 V, it delivers 12 mA low-level output drive and 7.1 ns typical propagation delay - sufficient for most 3.3 V logic interfaces. Input thresholds scale with VCC, maintaining noise margin.
Does 74AC11244DBR support hot insertion into a live bus?
No - 74AC11244DBR lacks explicit hot-swap protection circuitry. Its absolute maximum ratings permit VI up to VCC + 0.5 V, but uncontrolled bus insertion may exceed clamp current limits (±20 mA). Use external series resistors or dedicated hot-swap controllers when inserting into powered-backplane environments.
How does the flow-through pinout of 74AC11244DBR improve PCB layout versus traditional 74AC244 packages?
The 74AC11244DBR places all A inputs on the left side (pins 16–20, 22–23) and Y outputs on the right (pins 1–4, 9–12), enabling straight-line trace routing without vias or layer changes. This reduces parasitic inductance by ~35% and crosstalk by >6 dB compared to folded layouts in DW/DIP packages.
Is 74AC11244DBR pin-compatible with 74AC244 variants in the same DB package?
Yes - 74AC11244DBR shares identical 24-pin DB footprint, pin numbering, and functional pin assignments with 74AC244DBR. Both use the same mechanical outline (JEDEC MO-153), allowing direct substitution in existing SSOP-24 layouts without PCB revision.
74AC11244DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
74AC11244DBR FAQ
1.How can I place an order for 74AC11244DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11244DBR 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 74AC11244DBR reliable?
The price and inventory of 74AC11244DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11244DBR is usually 5 days.
3.What payment methods are accepted for 74AC11244DBR?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11244DBR?
74AC11244DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11244DBR 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 74AC11244DBR?
For technical support, including 74AC11244DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11244DBR requirements.
6.How does Aetrix verify that 74AC11244DBR is sourced from the original manufacturer or authorized distributors?
All 74AC11244DBR 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 74AC11244DBR meets industry standards.
7.What is the process for return or replacement of 74AC11244DBR?
All 74AC11244DBR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11244DBR, 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 74AC11244DBR part is unused and in its original packaging.
Return procedure for 74AC11244DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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