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Texas Instruments 74AC11244PWR
- Part No.:
- 74AC11244PWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC11244PWR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,843
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Product details
Overview
74AC11244PWR from Texas Instruments is an octal 3-state noninverting 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, ±24 mA output drive at 5 V, 7.3 ns max propagation delay (VCC = 5 V), and operation across –40°C to 85°C.
For engineers reviewing the 74AC11244PWR datasheet, 74AC11244PWR pinout, 74AC11244PWR application, or 74AC11244PWR equivalent, key selection criteria include 3-state bus-driving capability, dual 4-bit enable control, TSSOP-24 package compatibility, and AC-family logic performance with TTL-compatible inputs.
Technical Context
The 74AC11244PWR implements a flow-through pin architecture-inputs on one side, outputs on the opposite-to minimize PCB trace crossovers and signal skew. Its EPIC™ 1-µm CMOS process delivers high noise immunity (500 mA latch-up immunity at 125°C) and low dynamic power dissipation (27 pF typical power-dissipation capacitance per buffer).
Each of the eight drivers operates independently under dedicated OE controls (1OE for Y1–Y4, 2OE for Y9–Y12); outputs enter high-impedance state when OE is high. The center-pin VCC/GND configuration reduces simultaneous switching noise in high-speed bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC), TTL-compatible input thresholds |
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing |
| Output Drive (IOL/IOH) | ±24 mA at VCC = 5 V - sufficient to drive 50-Ω transmission lines or multiple TTL loads |
| Propagation Delay (tPLH/tPHL) | ≤7.3 ns at VCC = 5 V - enables reliable operation in >100 MHz bus systems |
| 3-State Enable/Disable Time | tPZH ≤8.5 ns, tPHZ ≤7.3 ns - ensures clean bus turnaround without contention |
| Input/Output Capacitance | Ci = 4 pF, Co = 10 pF - minimizes loading on upstream drivers and downstream traces |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y1–1Y4 (Pins 1–4) | Section 1 output | Noninverted buffered outputs driven by 1A1–1A4 when 1OE = L |
| 2Y1–2Y4 (Pins 9–12) | Section 2 output | Noninverted buffered outputs driven by 2A1–2A4 when 2OE = L |
| 1A1–1A4 (Pins 22–20, 13) | Section 1 input | Direct logic inputs to first 4-bit buffer section |
| 2A1–2A4 (Pins 16–14, 17) | Section 2 input | Direct logic inputs to second 4-bit buffer section |
| 1OE (Pin 23), 2OE (Pin 17) | Active-low output enable | Independent control of 3-state output behavior per section; tie to VCC via pullup for power-up safety |
| VCC (Pins 24, 16) | Power supply | Center-placed dual VCC pins reduce IR drop and high-frequency noise coupling |
| GND (Pins 5–8) | Ground reference | Four adjacent GND pins provide low-inductance return path for all 8 drivers |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Eliminates layer jumps and vias in PCB layout for dense bus routing |
| Center-pin VCC/GND | Reduces ground bounce and supply noise during simultaneous switching of all 8 outputs |
| 500-mA latch-up immunity | Enables robust operation in noisy industrial environments without external protection circuitry |
| Low-power AC logic | 80 µA max ICC at 5.5 V - suitable for power-sensitive memory interface subsystems |
| High-speed 3-state control | Sub-10 ns enable/disable transitions prevent bus contention in multiplexed address/data paths |
Applications
| Memory Address Buffering | PCI/ISA Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or Flash memory array. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory address inputs; enables shared bus access with DMA controllers. Use Value: 7.3 ns propagation delay ensures setup/hold timing margins at 20-MHz bus clock; dual OE allows interleaved memory bank selection. |
Use Scenario: Level-shifting and bus isolation between legacy ISA slot controller and peripheral I/O chips. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control per 4-bit segment, supporting read/write direction switching. Use Value: ±24 mA drive strength meets ISA specification load requirements; flow-through layout simplifies 2-layer backplane routing. |
| Industrial PLC I/O Expansion | Test Equipment Signal Routing |
|
Use Scenario: Expanding digital I/O count on programmable logic controller mainboard using parallel port expansion modules. IC Role / Device Role / Timing Role: Octal buffer enabling/disabling groups of 4-bit status or control signals under firmware command. Use Value: –40°C to +85°C rating ensures reliability in uncontrolled cabinet environments; 500-mA latch-up immunity withstands field-induced transients. |
Use Scenario: Reconfigurable signal path selection in automated test equipment (ATE) channel cards. IC Role / Device Role / Timing Role: 3-state switch matrix element routing stimulus or measurement signals between DUT and instrumentation resources. Use Value: Sub-10 ns enable/disable time supports <100 ns channel switching; low Co (10 pF) preserves signal integrity up to 100 MHz. |
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 |
|---|---|---|---|
| SN74ACT125PWR | Quad buffer (4 channels), not octal; identical AC logic family, same TSSOP-14 package | Requires two devices to match 74AC11244PWR's 8-channel capacity; higher board area and routing complexity | Select only if system requires independent per-channel OE control (each ACT125 buffer has its own OE) |
| 74LVC244APWRE4 | Lower voltage (1.65–3.6 V), higher speed (tPD = 4.2 ns @ 3.3 V), but reduced drive (±24 mA @ 3.3 V only) | Not suitable for 5-V bus systems; requires level translation when interfacing with 5-V peripherals | Prefer for new 3.3-V designs where lower power and faster timing outweigh 5-V compatibility needs |
Compared with SN74ACT125PWR and 74LVC244APWRE4, the 74AC11244PWR uniquely delivers 8-channel 3-state buffering in a single TSSOP-24 package with full 5-V tolerance, making it optimal for legacy industrial and memory interface designs requiring minimal footprint and proven reliability.
Availability
74AC11244PWR is available at Aetrix Electronics and suitable for memory address buffering, industrial PLC I/O expansion, and legacy bus interface applications requiring stable component supply and long-term industrial temperature support.
Supply support for 74AC11244PWR 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 90 years of innovation in industrial, automotive, and communications markets.
The 74AC11244PWR belongs to TI's legacy AC logic family-engineered for high-speed, low-noise bus driving in industrial control and memory subsystems where 5-V compatibility and latch-up robustness are critical.
FAQ
What is the maximum operating supply voltage for the 74AC11244PWR?
The 74AC11244PWR supports a supply voltage range of 3 V to 5.5 V, with absolute maximum rating of 7 V. Operation above 5.5 V is not recommended and may cause permanent damage. At 5.5 V, electrical characteristics such as VOH (≥3.85 V) and VOL (≤0.44 V) remain within specification, ensuring reliable interfacing with standard 5-V TTL and CMOS systems.
Does the 74AC11244PWR require external pull-up resistors on its OE pins?
Yes - to ensure outputs remain in high-impedance state during power-up or power-down, both 1OE and 2OE should be tied to VCC through pull-up resistors. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends ≥10 kΩ for typical microcontroller GPIO control, balancing noise immunity and rise time.
Can the 74AC11244PWR drive a 50-Ω transmission line directly?
Yes - the 74AC11244PWR delivers ±24 mA output current at 5 V, sufficient to drive a 50-Ω line terminated at VCC/2 (requiring ~10 mA). For unterminated lines or longer traces, series termination near the driver output is recommended to suppress reflections, leveraging the device's 7.3 ns propagation delay and low output capacitance (10 pF).
Is the 74AC11244PWR pin-compatible with other octal buffers in TSSOP-24 packages?
No - while the 74AC11244PWR uses the standard TSSOP-24 (PW) footprint, its pinout is specific to the AC11244 function: dual 4-bit sections with separate OE inputs and flow-through I/O arrangement. Devices like 74AC541PWR have different input/output groupings and OE placement, requiring PCB redesign for substitution.
What is the thermal resistance (θJA) of the 74AC11244PWR in its TSSOP-24 package?
The 74AC11244PWR in TSSOP-24 (PW) package has a specified junction-to-ambient thermal resistance (θJA) of 120°C/W under JEDEC JESD51-2 conditions. This value assumes standard 2-layer PCB layout with no thermal vias; adding copper pour and thermal vias beneath the exposed pad (if present) can reduce effective θJA by up to 30% in production designs.
74AC11244PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
74AC11244PWR FAQ
1.How can I place an order for 74AC11244PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11244PWR 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 74AC11244PWR reliable?
The price and inventory of 74AC11244PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11244PWR is usually 5 days.
3.What payment methods are accepted for 74AC11244PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11244PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11244PWR?
74AC11244PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11244PWR 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 74AC11244PWR?
For technical support, including 74AC11244PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11244PWR requirements.
6.How does Aetrix verify that 74AC11244PWR is sourced from the original manufacturer or authorized distributors?
All 74AC11244PWR 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 74AC11244PWR meets industry standards.
7.What is the process for return or replacement of 74AC11244PWR?
All 74AC11244PWR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11244PWR, 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 74AC11244PWR part is unused and in its original packaging.
Return procedure for 74AC11244PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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