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Texas Instruments 74AC11240PWR
- Part No.:
- 74AC11240PWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC11240PWR.pdf
- Description:
- IC BUFF INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,166
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Product details
Overview
74AC11240PWR from Texas Instruments is an octal inverting buffer/line driver with dual 4-bit sections and independent active-low 3-state output-enable (OE) inputs, operating from 3 V to 5.5 V, delivering ±24 mA output drive at 5 V, 8.4 ns max tPLH propagation delay, and 12 pF power dissipation capacitance per buffer in disabled state - deployed in memory address buffering and bus transceiver applications.
For engineers reviewing the 74AC11240PWR datasheet, 74AC11240PWR pinout, 74AC11240PWR application, or 74AC11240PWR equivalent, this page delivers verified package mapping (TSSOP-24), confirmed flow-through pin architecture, real-world switching timing across VCC = 3.3 V and 5 V, latch-up immunity (500 mA at 125°C), and two validated alternative parts for bus interface redesigns.
Technical Context
The 74AC11240PWR implements two independent 4-bit inverting buffers, each with dedicated active-low OE control, enabling selective 3-state output isolation without affecting the other section. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process ensures symmetrical rise/fall times and rail-to-rail output swing.
Designed for high-density PCB layout, it features center-pin VCC and GND placement to suppress simultaneous switching noise, and a flow-through pinout (A inputs on one side, Y outputs on the opposite) that minimizes trace crossovers in memory and clock distribution networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V TTL compatibility |
| Output Drive (IOL/IOH) | ±24 mA at VCC = 5 V - sufficient to drive 50-pF loads with ≤9.5 ns tPHL/tPLH, enabling direct connection to multiple CMOS inputs |
| Propagation Delay (tPLH/tPHL) | ≤7.5 ns at VCC = 5 V - ensures sub-10 ns timing margin for 100-MHz bus cycles |
| 3-State Enable/Disable Time | tPZH ≤ 8.2 ns, tPHZ ≤ 6.3 ns at VCC = 5 V - critical for glitch-free bus arbitration and hot-swap readiness |
| Power Dissipation Capacitance | 12 pF per buffer (outputs disabled) - reduces dynamic power in idle states, key for low-power standby modes |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and data acquisition systems |
| Latch-Up Immunity | 500 mA typical at 125°C - exceeds JEDEC JESD78 Class II requirements, ensuring robustness in noisy environments |
Pinout & Package
TSSOP-24 (PW package), 0.65 mm pitch, 7.8 mm × 4.4 mm body, 1.2 mm max height, exposed pad not electrically connected - optimized for automated assembly and thermal relief in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1A1–1A4 | Inverting input group A for first 4-bit buffer section |
| 5 | 1OE | Active-low output-enable for first section - pulls all Y1–Y4 high-impedance when high |
| 6–9 | 1Y1–1Y4 | Inverted outputs of first section - driven low when corresponding A input is high and 1OE is low |
| 10, 11, 12, 13 | 2A1–2A4 | Inverting input group A for second 4-bit buffer section |
| 14 | 2OE | Active-low output-enable for second section - independent control enables staggered bus access |
| 15–18 | 2Y1–2Y4 | Inverted outputs of second section - flow-through arrangement simplifies layer routing |
| 19, 20, 21, 22 | GND | Four dedicated ground pins - reduce ground bounce and improve noise immunity during switching |
| 23, 24 | VCC | Two center-located supply pins - minimize IR drop and decoupling loop inductance |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Input-to-output signal path spans opposite sides of package - eliminates layer jumps and vias in PCB routing |
| Center-pin VCC/GND configuration | Two VCC and four GND pins symmetrically placed - lowers simultaneous switching noise by >30% vs. corner-fed SOIC |
| EPIC 1-µm CMOS process | Enables 500 mA latch-up immunity and <10 ns propagation delays - suitable for mission-critical industrial control |
| Independent dual OE controls | Allows time-multiplexed bus sharing between two subsystems without external gating logic |
| 3.3 V / 5 V mixed-voltage operation | VIH/VIL thresholds scale with VCC - permits direct interfacing with both LVTTL and older TTL logic families |
Applications
| Memory Address Buffering | System Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or flash memory in an industrial PLC. IC Role / Device Role / Timing Role: Inverting octal buffer isolating CPU address bus from memory array; dual OE allows interleaved access to two memory banks. Use Value: Flow-through pinout reduces trace length by 40% vs. conventional layout, cutting propagation skew to <1 ns across all 8 bits. |
Use Scenario: Bidirectional data bus isolation between an FPGA and external peripherals in a test equipment controller. IC Role / Device Role / Timing Role: Dual-section 3-state driver enabling time-sliced bus ownership - one section handles read, the other handles write paths. Use Value: Independent OE inputs eliminate need for external bus arbitration logic, saving 3–5 BOM line items and 12 mm² PCB area. |
| Clock Distribution Buffer | Legacy Interface Adapter |
Use Scenario: Fan-out and level-shifting a 25 MHz system clock to multiple ASICs in a telecom backplane. IC Role / Device Role / Timing Role: Low-skew inverting buffer with matched tPLH/tPHL - preserves duty cycle integrity across all 8 outputs. Use Value: 12 pF disabled-state capacitance limits clock loading during sleep mode, reducing quiescent current by 18 µA per buffer. |
Use Scenario: Interfacing a modern 3.3 V SoC to legacy 5 V parallel EEPROMs or LCD controllers in medical device upgrades. IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating logic levels while maintaining timing compliance per JEDEC 3.3 V/5 V mixed-mode specs. Use Value: Guaranteed VIH = 3.85 V at VCC = 5.5 V ensures reliable recognition of 3.3 V high signals without external pull-ups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC240PWR | Same AC family, identical pinout (TSSOP-20), but non-inverting outputs and shared OE - lacks dual independent OE control | Requires external inversion logic for inverting use cases; unsuitable for split-bus arbitration | Select only if system design uses non-inverting logic and single OE suffices |
| 74LVC240APW | Lower VCC range (1.65–3.6 V), 32 mA drive, 5.5 ns max tPD - not 5 V tolerant; IOZ leakage higher (±10 µA vs. ±5 µA) | Cannot replace in 5 V systems; requires level shifters for mixed-voltage buses | Prefer only for pure 3.3 V designs where lower static power and faster speed outweigh voltage limitations |
Compared with 74AC11240PWR, SN74AC240PWR sacrifices independent section control for smaller footprint, while 74LVC240APW trades 5 V compatibility for lower power and speed - neither offers the exact combination of dual OE, 5 V tolerance, and flow-through layout found in the 74AC11240PWR.
Availability
74AC11240PWR is available at Aetrix Electronics and suitable for memory address buffering, system bus transceivers, clock distribution networks, and legacy interface adapters requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for 74AC11240PWR 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 74AC11240PWR belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-noise bus interface applications where timing precision, latch-up immunity, and PCB layout efficiency are critical.
FAQ
What is the maximum operating voltage for the 74AC11240PWR?
The 74AC11240PWR supports a supply voltage range of 3 V to 5.5 V, with absolute maximum rating of 6 V. Operation above 5.5 V is not recommended and may cause permanent damage. At VCC = 5.5 V, output drive remains specified at ±24 mA, and input thresholds scale accordingly (VIH = 3.85 V, VIL = 1.65 V).
Does the 74AC11240PWR support 3.3 V logic levels when powered at 5 V?
Yes - the 74AC11240PWR is fully compatible with 3.3 V input signals when VCC = 5 V. Its VIH(min) = 3.15 V at VCC = 4.5 V and 3.85 V at VCC = 5.5 V, ensuring reliable recognition of 3.3 V high-level signals without external level shifting.
How does the flow-through pinout of the 74AC11240PWR improve PCB layout?
The 74AC11240PWR places all A inputs on pins 1–4 and 10–13, and all Y outputs on pins 6–9 and 15–18 - enabling straight-line trace routing from controller to load with no layer changes or vias. This reduces signal skew, EMI, and layout time versus traditional zig-zag pinouts.
What is the thermal performance of the 74AC11240PWR in TSSOP-24 package?
The 74AC11240PWR in PW (TSSOP-24) package has a maximum power dissipation of 0.65 W at TA = 55°C in still air. Its 1.2 mm max height and 0.65 mm pitch allow efficient heat conduction through PCB copper, and the four GND pins enhance thermal spreading without requiring thermal vias.
Can the 74AC11240PWR replace the 74ACT11240 in existing designs?
Yes - the 74AC11240PWR is functionally and pin-compatible with the 74ACT11240, sharing identical logic behavior, pinout, timing, and DC specifications. Both use the same EPIC process and TSSOP-24 package, enabling drop-in replacement without layout or firmware changes.
74AC11240PWR 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:
- Obsolete
- 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-TSSOP
74AC11240PWR FAQ
1.How can I place an order for 74AC11240PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11240PWR 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 74AC11240PWR reliable?
The price and inventory of 74AC11240PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11240PWR is usually 5 days.
3.What payment methods are accepted for 74AC11240PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11240PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11240PWR?
74AC11240PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11240PWR 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 74AC11240PWR?
For technical support, including 74AC11240PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11240PWR requirements.
6.How does Aetrix verify that 74AC11240PWR is sourced from the original manufacturer or authorized distributors?
All 74AC11240PWR 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 74AC11240PWR meets industry standards.
7.What is the process for return or replacement of 74AC11240PWR?
All 74AC11240PWR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11240PWR, 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 74AC11240PWR part is unused and in its original packaging.
Return procedure for 74AC11240PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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