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Texas Instruments 74AC11240PW
- Part No.:
- 74AC11240PW
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC11240PW.pdf
- Description:
- IC BUFF INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,265
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Product details
Overview
74AC11240PW from Texas Instruments is an octal inverting buffer/line driver with dual 4-bit sections, active-low 3-state outputs, and flow-through pinout architecture optimized for high-density bus interface applications. It operates from –40°C to 85°C at VCC = 3–5.5 V, delivers ±24 mA output drive, and features symmetrical OE control per section for independent bus management in memory address or clock distribution systems.
For engineers reviewing the 74AC11240PW datasheet, 74AC11240PW pinout, 74AC11240PW application, or 74AC11240PW equivalent, this device is selected for low-noise, high-fan-out 3-state buffering where PCB layout efficiency, latch-up immunity (500 mA at 125°C), and fast propagation (tPLH/tPHL ≤ 7.5 ns at 5 V) are critical in industrial and embedded bus systems.
Technical Context
The 74AC11240PW implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) inputs - 1OE controls Y1–Y4, 2OE controls Y1–Y4 of the second section. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process enables rail-to-rail output swing and high noise immunity.
Center-pin VCC and GND placement minimizes switching noise during simultaneous output transitions. The device supports flow-through architecture: A1–A4 and Y1–Y4 are arranged on opposite sides of the TSSOP-24 package to simplify layer routing and reduce trace crosstalk in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 5.5 V - Supports mixed-voltage system interfacing and robust operation across industrial supply tolerances. |
| Output Drive | ±24 mA at VCC = 4.5–5.5 V - Sufficient to drive 50-pF loads with <8 ns propagation delay and maintain signal integrity on stubbed buses. |
| tPLH / tPHL | ≤7.5 ns at VCC = 5 V - Enables reliable timing in 100+ MHz clock distribution and address latching without added delay compensation. |
| IOZ (Off-State Leakage) | ±5 µA max at VCC = 5.5 V - Ensures minimal bus contention current when outputs are disabled, critical for hot-swap or multi-driver arbitration. |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - Compatible with TTL and CMOS logic families, enabling seamless integration into legacy and modern digital systems. |
| Power Dissipation | 12 pF Cpd (outputs disabled) - Reduces dynamic power consumption during bus idle states, supporting low-power system modes. |
Pinout & Package
TSSOP-24 (PW) package: 7.9 mm × 4.5 mm × 1.2 mm body, 0.65 mm lead pitch, exposed thermal pad (non-electrical), RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1A1–1A4 Inputs | Inverting data inputs for first 4-bit buffer section; accept standard CMOS/TTL logic levels. |
| 5 | 1OE | Active-low output-enable for Y1–Y4; drives all four outputs to high-Z when high. |
| 6–9 | 1Y1–1Y4 Outputs | Inverted buffered outputs of first section; drive bidirectional buses or downstream logic with ±24 mA capability. |
| 10, 11, 12, 13 | 2A1–2A4 Inputs | Inverting data inputs for second 4-bit buffer section; electrically isolated from first section. |
| 14 | 2OE | Active-low output-enable for Y1–Y4 of second section; enables independent bus segment control. |
| 15–18 | 2Y1–2Y4 Outputs | Inverted buffered outputs of second section; support dual-bus isolation or mirrored signal paths. |
| 19, 20, 21, 22 | GND | Four dedicated ground terminals - reduce ground bounce and improve noise margin during high-speed switching. |
| 23, 24 | VCC | Two dedicated VCC terminals - lower supply impedance and suppress simultaneous switching noise via distributed power delivery. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins aligned on opposite sides of package - eliminates layer jumps and vias in PCB routing, reducing EMI and signal skew. |
| Center-pin VCC/GND | Dual VCC (pins 23–24) and quad GND (pins 19–22) placed centrally - lowers high-frequency impedance and suppresses ground bounce in multi-output switching. |
| EPIC CMOS process | 1-µm implanted CMOS - achieves 500 mA latch-up immunity at 125°C, enabling reliable operation in harsh industrial environments. |
| Symmetrical OE control | Separate 1OE and 2OE inputs - allows independent enable/disable of each 4-bit section, supporting flexible bus segmentation and power-gating strategies. |
| High fan-out capability | Drives ≥10 LSTTL loads or 50-pF capacitive loads - eliminates need for intermediate buffers in memory address or clock fanout trees. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving multiplexed address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level translation, fan-out amplification, and bus isolation between controller and memory banks. Use Value: Prevents address bus contention during memory access arbitration; flow-through pinout simplifies routing in space-constrained memory modules. |
Use Scenario: Distributing a master system clock to multiple peripherals (e.g., ADCs, DACs, FPGAs) while maintaining edge integrity. IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer with independent OE control for selective peripheral clock gating. Use Value: ±24 mA drive and ≤7.5 ns propagation ensure clean, synchronized clock edges across 50-pF loads without external termination. |
| Industrial Bus Transceiver Interface | Legacy Peripheral Expansion |
|
Use Scenario: Interfacing a microprocessor's data/address bus to RS-485 transceivers or CAN controllers requiring 3-state isolation. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control for direction management and noise suppression. Use Value: Dual-section architecture allows separate control of address and data paths; center-pin power reduces switching noise coupling into analog subsystems. |
Use Scenario: Adding ISA- or LPC-compatible peripheral slots to modern embedded controllers using legacy parallel I/O devices. IC Role / Device Role / Timing Role: Octal inverting buffer enabling compatibility with older non-inverting bus protocols via logic inversion and 3-state handshake. Use Value: Active-low OE inputs align with standard bus control signals (e.g., IOR#, IOW#); TSSOP-24 footprint fits compact expansion headers. |
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 |
|---|---|---|---|
| SN74AC240N | PDIP-20 package, single OE input for all 8 outputs, no flow-through pinout. | Lacks independent section control and optimized PCB layout; higher ground bounce risk due to single GND/VCC pair. | Select when cost-sensitive through-hole assembly is required and dual OE control is unnecessary. |
| 74LVC240APW | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), same TSSOP-20 pinout but different pin mapping and no dual OE. | Not suitable for 5 V systems; lacks 5 V tolerance and independent section enable - limits use in mixed-voltage or segmented bus designs. | Choose only for 3.3 V-only systems where voltage scaling and lower static power outweigh flexibility needs. |
Compared with SN74AC240N and 74LVC240APW, the 74AC11240PW uniquely combines dual independent OE control, flow-through routing, and 5 V operation in a thermally enhanced TSSOP-24 package - making it optimal for high-reliability, layout-sensitive industrial bus interfaces where section-level bus arbitration and noise control are mandatory.
Availability
74AC11240PW is available at Aetrix Electronics and suitable for industrial automation controllers, embedded memory subsystems, and programmable logic interface circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74AC11240PW 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 high-reliability industrial and automotive electronics.
The 74AC11240PW belongs to TI's AC-series advanced CMOS logic family, designed specifically for high-speed, low-noise bus interface applications in industrial control, instrumentation, and legacy system upgrades where 5 V compatibility and robust latch-up immunity are essential.
FAQ
What is the operating temperature range for the 74AC11240PW?
The 74AC11240PW is characterized for operation from –40°C to +85°C. This full industrial temperature range ensures reliable performance in demanding environments such as factory automation controllers, outdoor instrumentation, and motor drive interfaces where ambient thermal stress is common. All electrical specifications in the datasheet - including propagation delay, output drive, and input thresholds - are guaranteed across this range.
Does the 74AC11240PW support 5 V logic systems?
Yes, the 74AC11240PW fully supports 5 V logic systems. Its recommended VCC range is 3 V to 5.5 V, and key parameters - including VOH ≥ 4.94 V and VOL ≤ 0.44 V at VCC = 5.5 V with IOL = 24 mA - are specified for 5 V operation. Input thresholds (VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V) ensure robust noise margins against TTL and standard CMOS logic families.
How does the dual OE architecture of the 74AC11240PW improve system design?
The 74AC11240PW features two independent active-low output-enable inputs - 1OE for Y1–Y4 and 2OE for Y1–Y4 - enabling true section-level bus control. This allows designers to isolate memory address and data paths, gate clock domains independently, or implement staggered enable sequencing to minimize simultaneous switching noise. Unlike single-OE alternatives, it eliminates bus contention risks in multi-segment architectures without additional logic.
What is the significance of the flow-through pinout in the 74AC11240PW TSSOP package?
The flow-through pinout of the 74AC11240PW places inputs (A1–A4, A1–A4) on one side and corresponding outputs (Y1–Y4, Y1–Y4) on the opposite side - enabling straight-line PCB traces with no layer changes or vias. This reduces signal path length, minimizes crosstalk and skew, and improves EMI performance in high-density layouts such as compact industrial PLC modules or FPGA carrier boards.
Is the 74AC11240PW pin-compatible with other TSSOP-24 logic devices?
No, the 74AC11240PW has a unique pin assignment optimized for its dual-section, flow-through architecture and center-pin VCC/GND configuration. While it shares the TSSOP-24 mechanical outline (PW package) with other TI devices, its pin mapping - including four GND pins (19–22) and dual VCC pins (23–24) - differs from generic TSSOP-24 logic ICs. Layout reuse requires verification against the official 74AC11240PW pin diagram, not generic footprint libraries.
74AC11240PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
74AC11240PW FAQ
1.How can I place an order for 74AC11240PW through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11240PW 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 74AC11240PW reliable?
The price and inventory of 74AC11240PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11240PW is usually 5 days.
3.What payment methods are accepted for 74AC11240PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11240PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11240PW?
74AC11240PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11240PW 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 74AC11240PW?
For technical support, including 74AC11240PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11240PW requirements.
6.How does Aetrix verify that 74AC11240PW is sourced from the original manufacturer or authorized distributors?
All 74AC11240PW 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 74AC11240PW meets industry standards.
7.What is the process for return or replacement of 74AC11240PW?
All 74AC11240PW units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11240PW, 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 74AC11240PW part is unused and in its original packaging.
Return procedure for 74AC11240PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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