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Texas Instruments 74AC11240DW
- Part No.:
- 74AC11240DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AC11240DW.pdf
- Description:
- IC BUFF INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,507
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Product details
Overview
74AC11240DW from Texas Instruments is an octal inverting buffer/line driver with dual 4-bit sections, 3-state outputs, active-low output-enable (OE) control, ±24 mA drive strength at 5 V, and flow-through pinout optimized for PCB layout. It operates from –40°C to 85°C and is used in memory address buffering, clock distribution, and bus transceivers where signal inversion and high fan-out are required.
For engineers reviewing the 74AC11240DW datasheet, 74AC11240DW pinout, 74AC11240DW application, or 74AC11240DW equivalent, key selection considerations include its inverting logic function, dual independent OE inputs, 24-pin SOIC (DW) package, 5.5 V absolute max supply, and 7.5 ns typical propagation delay at 5 V.
Technical Context
The 74AC11240DW implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (1OE and 2OE), enabling selective tri-state control of Y1–Y4 and Y1'–Y4' groups. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process delivers latch-up immunity up to 500 mA at 125°C.
It features center-pin VCC and GND placement to minimize high-speed switching noise, flow-through architecture for simplified trace routing, and symmetrical input/output timing - tPLH/tPHL ≤ 7.5 ns and tPZH/tPHZ ≤ 8.2 ns at VCC = 5 V, TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual 4-bit sections and independent active-low OE inputs |
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing with TTL/CMOS compatibility |
| Output Drive | ±24 mA at VCC = 5 V - sufficient to drive 50-Ω transmission lines or multiple CMOS loads |
| Propagation Delay | 7.5 ns max (A→Y, VCC = 5 V) - enables reliable operation in 100+ MHz bus systems |
| 3-State Enable Time | 9.2 ns max (OE→Y, VCC = 5 V) - ensures clean bus arbitration without contention glitches |
| Input Capacitance | 4 pF - minimizes loading on upstream drivers and preserves signal integrity |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
Pinout & Package
74AC11240DW is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), 7.5 mm wide, with gull-wing leads and JEDEC MO-153 compliance. Pin 1 index is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1A1–1A4 Inputs | First 4-bit group input signals - inverted and enabled by 1OE |
| 5 | 1OE | Active-low enable for first 4-bit buffer section - low = pass inverted data, high = high-Z |
| 6–9 | 1Y1–1Y4 Outputs | Inverted outputs of first section - high-Z when 1OE = high |
| 10, 11, 12, 13 | 2A1–2A4 Inputs | Second 4-bit group input signals - inverted and enabled by 2OE |
| 14 | 2OE | Active-low enable for second 4-bit buffer section - independent control from 1OE |
| 15–18 | 2Y1–2Y4 Outputs | Inverted outputs of second section - high-Z when 2OE = high |
| 19, 20, 21, 22 | GND | Four dedicated ground pins - reduce ground bounce and improve noise immunity |
| 23, 24 | VCC | Two dedicated power pins - center-placed to minimize supply loop inductance |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output signal path runs left-to-right across package - eliminates layer jumps and reduces crosstalk in dense layouts |
| Center-pin VCC/GND | VCC (pins 23–24) and GND (pins 19–22) placed centrally - lowers simultaneous switching noise (SSN) and improves PSRR |
| EPIC CMOS process | 1-µm implanted CMOS - delivers 500-mA latch-up immunity at 125°C for robust operation in noisy environments |
| Dual independent OE control | Separate 1OE (pin 5) and 2OE (pin 14) - allows staggered or asymmetric bus enable timing without external logic |
| High fan-out capability | Drives ≥20 LSTTL loads or 10 CMOS loads per output - reduces need for repeater stages in backplane designs |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving 8-bit address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control isolates address bus during memory access arbitration. Use Value: Dual OE inputs allow independent gating of upper/lower address nibbles, reducing bus contention during page-mode accesses. | Use Scenario: Distributing a system clock to multiple synchronous peripherals while maintaining edge integrity. IC Role / Device Role / Timing Role: Low-skew inverting driver with matched tPLH/tPHL ensures consistent clock phase alignment across receivers. Use Value: 7.5 ns max propagation delay and 4 pF input capacitance preserve rise/fall times for clocks up to 100 MHz. |
| Bus Transceiver Interface | Industrial I/O Expansion |
Use Scenario: Bidirectional data bus isolation between a host MCU and peripheral modules using direction-controlled 3-state outputs. IC Role / Device Role / Timing Role: Octal inverter with independent OE enables polarity-inverted data forwarding and tristate hold during direction switches. Use Value: Flow-through pinout simplifies routing of A/Y pairs, minimizing trace length mismatch and skew in parallel bus implementations. | Use Scenario: Expanding GPIO count on PLC or HMI controller by buffering digital sensor/actuator signals. IC Role / Device Role / Timing Role: High-drive buffer translates MCU logic levels to industrial 5 V tolerant I/O while providing noise margin. Use Value: ±24 mA output current and –40°C to +85°C rating support direct connection to relays, LEDs, and optocouplers without external drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT11240DW | TTL-compatible input thresholds (VIH = 2 V min), slightly higher ICC (100 µA typ vs. 80 µA) | Better suited for mixed 3.3 V/5 V systems interfacing with legacy TTL logic | Choose when interfacing with older 5 V TTL sources requiring guaranteed VIH recognition |
| SN74LVC8T245RHLR | Non-inverting, dual-supply (1.65–5.5 V), level-shifting capable, 32 mA drive | Supports bidirectional voltage translation but lacks native inverting function | Prefer when level shifting between 3.3 V and 5 V domains is required; requires external inversion if needed |
Compared with 74AC11240DW, the 74ACT11240DW offers tighter TTL input compatibility at the cost of marginally higher quiescent current, while the SN74LVC8T245RHLR provides flexible voltage translation but requires external logic for inversion - making 74AC11240DW optimal for fixed 5 V, inverting, high-noise-immunity bus buffering.
Availability
74AC11240DW is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial I/O expansion, and bus transceiver interfaces requiring stable component supply across long-lifecycle embedded programs.
Supply support for 74AC11240DW 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 with global manufacturing and quality certification.
The 74AC11240DW belongs to TI's AC-series advanced CMOS logic family, designed for high-speed, low-power, noise-immune digital interfacing in industrial, computing, and communications equipment.
FAQ
What is the maximum supply voltage rating for the 74AC11240DW?
The 74AC11240DW has an absolute maximum supply voltage (VCC) rating of 6 V. Operation beyond this limit risks permanent damage. The recommended operating range is 3 V to 5.5 V, with full AC/DC specifications guaranteed at 5 V ±0.5 V. Always observe the 500-mA latch-up immunity specification at elevated temperatures when designing for robustness.
Does the 74AC11240DW support 3.3 V operation?
Yes, the 74AC11240DW is fully specified for 3.3 V operation: VIH(min) = 2.1 V, VIL(max) = 0.9 V, and IOH/IOL performance is characterized at VCC = 3 V. Propagation delay increases to 11.7 ns max (tPLH) at 3 V, but all DC parameters remain valid - making it suitable for mixed-voltage systems with proper level awareness.
How are the output-enable (OE) inputs configured on the 74AC11240DW?
The 74AC11240DW has two independent active-low output-enable inputs: 1OE (pin 5) controls Y1–Y4, and 2OE (pin 14) controls Y1'–Y4'. When either OE is low, its associated 4-bit section passes inverted data; when high, outputs enter high-impedance state. This allows asynchronous or phased bus control without external gating logic.
What is the thermal performance of the 74AC11240DW in its SOIC (DW) package?
The 74AC11240DW in the DW package has a maximum power dissipation of 1.7 W at TA = 55°C in still air. Its EPIC CMOS process contributes to low dynamic power, with ICC = 80 µA typical at VCC = 5.5 V and TA = 25°C. Junction temperature must remain ≤150°C; derating is required above 55°C ambient per the 1.7 W rating.
Is the 74AC11240DW pin-compatible with other 24-pin octal buffers in the AC family?
Yes - the 74AC11240DW shares identical pinout and function with the 74AC11240DB (SSOP) and 74AC11240PW (TSSOP) variants. All use the same logic diagram, truth table, and terminal assignments per TI's SCAS448A datasheet. Mechanical differences exist only in package dimensions and thermal characteristics, not electrical or functional pin mapping.
74AC11240DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, 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-SOIC
74AC11240DW FAQ
1.How can I place an order for 74AC11240DW through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11240DW 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 74AC11240DW reliable?
The price and inventory of 74AC11240DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11240DW is usually 5 days.
3.What payment methods are accepted for 74AC11240DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11240DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11240DW?
74AC11240DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11240DW 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 74AC11240DW?
For technical support, including 74AC11240DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11240DW requirements.
6.How does Aetrix verify that 74AC11240DW is sourced from the original manufacturer or authorized distributors?
All 74AC11240DW 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 74AC11240DW meets industry standards.
7.What is the process for return or replacement of 74AC11240DW?
All 74AC11240DW units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11240DW, 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 74AC11240DW part is unused and in its original packaging.
Return procedure for 74AC11240DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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