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Texas Instruments 74AC11240NT
- Part No.:
- 74AC11240NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
74AC11240NT.pdf
- Description:
- IC BUFF INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,068
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Product details
Overview
74AC11240NT from Texas Instruments is an octal inverting buffer/line driver with dual 4-bit sections, active-low 3-state enable inputs, flow-through pinout architecture, and rated for –40°C to 85°C operation. It delivers 24 mA output drive at 5 V, 7.5 ns typical propagation delay (A→Y), and ±50 mA output current capability - used in memory address buffering, clock distribution, and bus transceiver interfaces.
For engineers reviewing the 74AC11240NT datasheet, 74AC11240NT pinout, 74AC11240NT application, or 74AC11240NT equivalent, key selection criteria include its inverting logic function, separate OE controls per 4-bit bank, NT-package 300-mil DIP footprint, high-speed CMOS (AC) performance, and compatibility with 3-V to 5.5-V supply rails.
Technical Context
This device implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) control. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process enables rail-to-rail output swing, low input capacitance (4 pF), and latch-up immunity of 500 mA at 125°C.
Designed for high-density PCB layout, it features center-pin VCC and GND placements to suppress switching noise, and a flow-through architecture that aligns inputs on one side and outputs on the opposite side - reducing trace crossovers and signal integrity degradation in bus-driven systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual 4-bit banks and independent active-low OE inputs |
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5-V designs |
| Output Drive (IOL/IOH) | ±24 mA at VCC = 5 V - sufficient to drive standard TTL loads and multiple CMOS inputs |
| Propagation Delay (tPLH/tPHL) | 7.5 ns max at VCC = 5 V - enables reliable operation in sub-100-MHz synchronous buses |
| 3-State Enable/Disable Time | tPZH/tPLZ ≤ 9.2 ns at VCC = 5 V - ensures clean bus arbitration without output contention |
| Input Capacitance (Ci) | 4 pF - minimizes loading on upstream drivers and preserves signal edge rates |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
Pinout & Package
74AC11240NT uses a 24-pin plastic 300-mil dual in-line package (DIP), with center-aligned VCC (pin 14) and GND (pins 7, 8, 10, 11) for low-noise power delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y1–1Y4 | Section 1 inverted outputs | Active-low enabled outputs corresponding to 1A1–1A4; high-impedance when 1OE = high |
| 2Y1–2Y4 | Section 2 inverted outputs | Active-low enabled outputs corresponding to 2A1–2A4; high-impedance when 2OE = high |
| 1A1–1A4 | Section 1 data inputs | Inverted and passed to 1Y1–1Y4 only when 1OE = low |
| 2A1–2A4 | Section 2 data inputs | Inverted and passed to 2Y1–2Y4 only when 2OE = low |
| 1OE, 2OE | Active-low output enables | Independent control of 3-state output drivers per 4-bit section |
| VCC (Pin 14) | Positive supply | Center-located for symmetrical decoupling and reduced ground bounce |
| GND (Pins 7,8,10,11) | Ground reference | Multiple pins minimize return-path inductance during high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output signal path runs left-to-right across package - simplifies PCB routing and reduces layer count |
| Center-pin VCC/GND | Reduces simultaneous switching noise by shortening power/ground loop inductance |
| EPIC 1-µm CMOS process | Delivers AC-series speed with improved latch-up immunity (500 mA @ 125°C) |
| High fan-out capability | Drives ≥20 LSTTL loads or >50 CMOS inputs per output - reduces need for repeater stages |
| Wide supply range (3–5.5 V) | Enables interoperability between 3.3-V and 5-V subsystems without level-shifting |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or ROM chips in a shared-bus architecture. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control isolates address bus segments during DMA or peripheral access cycles. Use Value: Dual OE inputs allow independent gating of upper/lower address nibbles, minimizing bus contention and enabling partial decoding. |
Use Scenario: Distributing a master clock signal to multiple synchronous peripherals (e.g., ADCs, DACs, UARTs) while maintaining edge integrity. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer with fast enable/disable timing ensures synchronized clock arrival across endpoints. Use Value: 7.5 ns max propagation delay and 9.2 ns max disable time prevent clock skew-induced setup/hold violations. |
| Parallel Bus Transceiver Interface | Legacy Peripheral Expansion |
Use Scenario: Bidirectional data transfer between a CPU and parallel I/O devices (e.g., printers, displays) using shared data lines. IC Role / Device Role / Timing Role: Direction-controlled 3-state driver/receiver - one section drives, the other receives, coordinated via OE signals. Use Value: Independent OE per 4-bit bank allows interleaved read/write handshaking without full bus turnaround delay. |
Use Scenario: Adding ISA or PC/104-compatible expansion slots to industrial controllers requiring 5-V tolerant logic. IC Role / Device Role / Timing Role: Level-translating buffer supporting 5-V bus signaling while interfacing with modern 3.3-V host logic via voltage scaling. Use Value: 3–5.5 V supply range and ±24 mA drive meet legacy peripheral electrical requirements without external translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT11240N | TTL-compatible input thresholds (VIH = 2 V min); otherwise identical pinout, function, and AC specs | Better suited for mixed-logic systems with legacy TTL sources | Select when driving from 5-V TTL or LS logic; retains same PCB layout |
| SN74AC240N | Non-inverting outputs; otherwise matches 74AC11240NT in speed, drive, and package | Used where signal polarity must be preserved (e.g., address mirroring, non-inverted bus extensions) | Choose when inversion is undesirable - requires logic-level adjustment in upstream design |
Compared with 74AC11240NT, 74ACT11240N offers TTL-input compatibility for legacy integration, while SN74AC240N provides non-inverting functionality - both share the same NT-DIP footprint and thermal profile but differ in logic polarity or input threshold behavior critical to interface stability.
Availability
74AC11240NT is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution networks, and industrial bus interface designs requiring stable component supply, long-term obsolescence management, and through-hole assembly compatibility.
Supply support for 74AC11240NT 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 innovator founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74AC11240NT belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-power, and noise-immune operation in dense PCB layouts - particularly targeting memory, clock, and bus interface applications in industrial control and computing systems.
FAQ
What is the logic function of the 74AC11240NT?
The 74AC11240NT is an octal inverting buffer/line driver organized as two independent 4-bit sections. Each section inverts input signals (A→Y) when its respective active-low output-enable (OE) input is asserted low; outputs enter high-impedance state when OE is high. This dual-OE architecture supports segmented bus control and partial address/data gating in real-time systems.
Does the 74AC11240NT support 3.3-V operation?
Yes, the 74AC11240NT operates over a supply range of 3 V to 5.5 V, making it fully compatible with 3.3-V systems. At VCC = 3.3 V, it maintains guaranteed VOH ≥ 2.48 V and VOL ≤ 0.44 V under 12-mA load, meeting standard 3.3-V CMOS interface requirements without level shifters.
What package type does the 74AC11240NT use?
The 74AC11240NT uses a 24-pin plastic 300-mil dual in-line package (DIP), designated by the "NT" suffix. It features center-pin VCC (pin 14) and four dedicated GND pins (7, 8, 10, 11) to reduce switching noise - a layout optimized for through-hole prototyping and industrial backplane applications.
How does the flow-through architecture benefit PCB design?
The 74AC11240NT's flow-through pinout places all inputs on the left side and all outputs on the right side of the NT-DIP package. This eliminates trace crossovers, reduces layer count, improves signal integrity in high-speed buses, and simplifies autorouting - especially valuable in dense memory or clock distribution layouts where signal skew must be minimized.
Is the 74AC11240NT pin-compatible with other AC-series octal buffers?
The 74AC11240NT shares the same 24-pin NT-DIP footprint and pin assignment with 74AC240N and 74ACT11240N. However, functional differences exist: 74AC240N is non-inverting, and 74ACT11240N uses TTL-compatible input thresholds. Pin compatibility enables mechanical drop-in replacement, but logic-level and polarity verification is required before substitution.
74AC11240NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 24-PDIP
74AC11240NT FAQ
1.How can I place an order for 74AC11240NT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11240NT 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 74AC11240NT reliable?
The price and inventory of 74AC11240NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11240NT is usually 5 days.
3.What payment methods are accepted for 74AC11240NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11240NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11240NT?
74AC11240NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11240NT 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 74AC11240NT?
For technical support, including 74AC11240NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11240NT requirements.
6.How does Aetrix verify that 74AC11240NT is sourced from the original manufacturer or authorized distributors?
All 74AC11240NT 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 74AC11240NT meets industry standards.
7.What is the process for return or replacement of 74AC11240NT?
All 74AC11240NT units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11240NT, 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 74AC11240NT part is unused and in its original packaging.
Return procedure for 74AC11240NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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