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Texas Instruments 74AC11240DBRG4
- Part No.:
- 74AC11240DBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74AC11240DBRG4.pdf
- Description:
- IC BUFF INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,399
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Product details
Overview
74AC11240DBRG4 from Texas Instruments is an octal inverting buffer/line driver with dual 4-bit sections, active-low 3-state outputs, and separate output-enable (OE) inputs per section. It operates from –40°C to 85°C at VCC = 3–5.5 V, delivers ±24 mA output drive, and features 5.4 ns typical propagation delay (VCC = 5 V). It is used in memory address buffering, clock distribution, and bus transceivers where flow-through pinout minimizes PCB trace crossovers.
For engineers reviewing the 74AC11240DBRG4 datasheet, 74AC11240DBRG4 pinout, 74AC11240DBRG4 application, or 74AC11240DBRG4 equivalent, this page provides verified functional identity, package-specific pin mapping, switching timing under real operating conditions, noise-reduction design features, and validated alternative options for industrial bus interface upgrades.
Technical Context
The 74AC11240DBRG4 implements two independent 4-bit inverting buffers, each with dedicated active-low OE control - enabling selective 3-state output disable without affecting the other section. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process ensures latch-up immunity of 500 mA at 125°C and supports high-speed operation with symmetrical rise/fall times.
Designed for dense PCB layouts, it uses center-pin VCC and GND placement to reduce simultaneous switching noise, and its flow-through architecture (A inputs on one side, Y outputs on the opposite) eliminates layer jumps in routing. Input transition rate limits are specified at 5 ns/V (OE) and 10 ns/V (data), enforcing clean edge control to prevent metastability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V TTL compatibility. |
| Output Drive | ±24 mA at VCC = 4.5–5.5 V - sufficient to drive 50 Ω transmission lines or fan-out to ≥20 LSTTL loads. |
| tPLH / tPHL | 5.4 ns / 4.6 ns max (VCC = 5 V) - enables reliable operation in 100+ MHz clock distribution paths. |
| IOZ (Off-State Leakage) | ±5 µA max at VCC = 5.5 V - ensures minimal bus contention during 3-state hold in shared-bus systems. |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - provides 0.8 V noise margin against TTL-level signals. |
| Power Dissipation Cap. | 39 pF per buffer (outputs enabled) - allows accurate dynamic power estimation at 1 MHz with CL = 50 pF. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments. |
Pinout & Package
74AC11240DBRG4 is packaged in a 24-pin Shrink Small-Outline Package (SSOP, DB), 0.300" body width, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1A1–1A4 (Section 1 Inputs) | Inverting data inputs for first 4-bit buffer section; accept standard CMOS/TTL logic levels. |
| 5 | 1OE (Section 1 Output Enable) | Active-low control: drives Y1–Y4 into high-Z when high; enables inverted pass-through when low. |
| 6–9 | 1Y1–1Y4 (Section 1 Outputs) | Inverted buffered outputs; 3-state capable; ±24 mA sink/source at VCC = 5 V. |
| 10, 11, 12, 13 | 2A1–2A4 (Section 2 Inputs) | Independent inverting inputs for second 4-bit buffer section; electrically isolated from Section 1. |
| 14 | 2OE (Section 2 Output Enable) | Active-low enable for second section; allows independent bus arbitration between two 4-bit channels. |
| 15–18 | 2Y1–2Y4 (Section 2 Outputs) | Second set of 3-state inverting outputs; identical drive strength and timing to Section 1. |
| 19, 20, 21, 22 | GND | Four dedicated ground pins - reduces ground bounce and improves noise immunity at high switching rates. |
| 23, 24 | VCC | Two center-located VCC pins - lowers power supply impedance and suppresses simultaneous switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left (pins 1–5), outputs on right (pins 6–18), power/ground centered (pins 19–24) - eliminates layer transitions and vias in dense bus routing. |
| Center-pin VCC/GND | Dual VCC (pins 23–24) and quad GND (pins 19–22) placed centrally - minimizes loop inductance and high-frequency supply noise coupling. |
| EPIC CMOS process | 1-µm implanted CMOS technology - achieves 500 mA latch-up immunity at 125°C and stable operation across full industrial temperature range. |
| Separate OE per section | Independent 1OE (pin 5) and 2OE (pin 14) - enables time-multiplexed or priority-based bus access without inter-section interference. |
| High noise immunity | Input thresholds defined at 30%/70% of VCC with 0.8 V min noise margin - robust against EMI in motor-control or power-conversion environments. |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM/Flash with signal integrity preservation. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fan-out expansion, and 3-state isolation during DMA cycles. Use Value: Flow-through layout prevents address skew; ±24 mA drive ensures fast edge rates across 10 cm traces; dual OE allows interleaved memory bank selection. |
Use Scenario: Distributing a single system clock to multiple synchronous peripherals (ADC, DAC, FPGA config ports). IC Role / Device Role / Timing Role: Low-skew inverting buffer with matched tPLH/tPHL - maintains duty-cycle fidelity and minimizes clock jitter accumulation. Use Value: 4.6 ns max tPHL at 5 V enables <10 ns total path skew across 8 loads; center VCC/GND suppresses supply-induced jitter. |
| Industrial Bus Transceiver Interface | Legacy System Signal Conditioning |
|
Use Scenario: Interfacing 3.3 V MCU GPIOs to 5 V RS-485 transceiver control lines with direction and enable management. IC Role / Device Role / Timing Role: Voltage-tolerant buffer with 3-state outputs acting as bidirectional bus isolator and level-shifting repeater. Use Value: VIH/VIL specs guarantee reliable recognition of 3.3 V logic on 5 V rails; independent OE pins allow precise timing of bus turn-around. |
Use Scenario: Replacing obsolete 74LS240 in aging test equipment requiring drop-in-compatible speed and drive upgrade. IC Role / Device Role / Timing Role: Pin-compatible AC-series replacement delivering 3× faster propagation and 5× lower ICC than LS equivalents. Use Value: 5.4 ns max tPLH vs. 25 ns for LS240; 8 µA typical ICC vs. 25 mA for LS - cuts system power by >99% in standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC240N | Same logic function and pinout (DIP-20), but only 20-pin package; no SSOP option; higher ICC (15 µA typ vs. 8 µA). | Preferred for through-hole prototyping or legacy DIP-based systems; lacks shrink-outline footprint for space-constrained designs. | Select SN74AC240N only when board layout requires DIP-20 or when SSOP rework is not feasible. |
| 74LVC240APW | 3.3 V only (1.65–3.6 V VCC); lower drive (±24 mA @ 3.3 V); TSSOP-20; 3.5 ns max tPD; no 5 V tolerance. | Suitable for modern low-voltage digital systems; incompatible with 5 V buses or mixed-supply backplanes. | Choose 74LVC240APW for new 3.3 V-only designs prioritizing speed and density; avoid where 5 V interoperability is required. |
Compared with SN74AC240N, 74AC11240DBRG4 offers SSOP packaging and lower quiescent current; compared with 74LVC240APW, it supports full 5 V operation and maintains backward compatibility with TTL-level inputs - making it the only option among the three for industrial 5 V bus interfaces requiring shrink-outline mounting.
Availability
74AC11240DBRG4 is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution, industrial bus interfaces, and legacy system upgrades requiring stable component supply over extended production lifecycles.
Supply support for 74AC11240DBRG4 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 broad industrial, automotive, and communications reach.
The 74AC11240DBRG4 belongs to TI's AC-series advanced CMOS logic family, designed specifically for high-speed, low-noise, 3-state bus interface applications in industrial control, instrumentation, and memory systems.
FAQ
What is the maximum operating voltage for the 74AC11240DBRG4?
The 74AC11240DBRG4 has an absolute maximum supply voltage of 6 V, but its recommended operating range is 3 V to 5.5 V. Operation above 5.5 V risks exceeding electrical specifications and may compromise reliability or cause permanent damage. All timing and drive parameters in the datasheet are characterized within the 3–5.5 V window, and 5 V is the most commonly used rail for optimal noise margin and compatibility with legacy TTL systems.
Does the 74AC11240DBRG4 support 3.3 V logic levels?
Yes, the 74AC11240DBRG4 is fully operational at VCC = 3.3 V and meets all AC and DC specifications across the full –40°C to +85°C range. At 3.3 V, it delivers ±12 mA output drive and maintains 7.6 ns max tPLH - making it suitable for mixed-voltage systems interfacing with 3.3 V microcontrollers while driving 5 V peripherals via level-shifting configurations.
Is the 74AC11240DBRG4 pin-compatible with the 74LS240?
No - the 74AC11240DBRG4 is not pin-compatible with the 74LS240. While both are octal inverting buffers with 3-state outputs, the 74AC11240DBRG4 uses a 24-pin SSOP (DB) package with dual OE inputs and flow-through pinout, whereas the 74LS240 uses a 20-pin DIP/SOIC with shared OE and traditional input-output adjacency. Direct replacement requires PCB redesign.
What is the purpose of the four GND pins on the 74AC11240DBRG4?
The four dedicated GND pins (pins 19–22) on the 74AC11240DBRG4 reduce ground impedance and minimize simultaneous switching noise by distributing return current across multiple low-inductance paths. This configuration is critical for maintaining signal integrity in high-speed bus applications and is a key part of TI's noise-reduction layout strategy for the AC-series.
Can the 74AC11240DBRG4 be used in place of a non-inverting buffer like the 74AC11244?
No - the 74AC11240DBRG4 provides inverting logic (Y = NOT A), while the 74AC11244 is non-inverting (Y = A). Swapping them without logic inversion elsewhere in the signal path will cause functional failure. The pinouts also differ: 74AC11244 has different OE placement and output ordering. They are functionally distinct and not interchangeable without circuit modification.
74AC11240DBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SSOP
74AC11240DBRG4 FAQ
1.How can I place an order for 74AC11240DBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11240DBRG4 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 74AC11240DBRG4 reliable?
The price and inventory of 74AC11240DBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11240DBRG4 is usually 5 days.
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Once your 74AC11240DBRG4 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 74AC11240DBRG4?
For technical support, including 74AC11240DBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11240DBRG4 requirements.
6.How does Aetrix verify that 74AC11240DBRG4 is sourced from the original manufacturer or authorized distributors?
All 74AC11240DBRG4 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 74AC11240DBRG4 meets industry standards.
7.What is the process for return or replacement of 74AC11240DBRG4?
All 74AC11240DBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11240DBRG4, 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 74AC11240DBRG4 part is unused and in its original packaging.
Return procedure for 74AC11240DBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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