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Texas Instruments 74AC11240PWRG4
- Part No.:
- 74AC11240PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC11240PWRG4.pdf
- Description:
- IC BUFF INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,028
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Product details
Overview
74AC11240PWRG4 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 3 V to 5.5 V, delivers ±24 mA output drive at 5 V, supports –40°C to 85°C industrial temperature range, and features flow-through pinout for optimized PCB layout-used in memory address buffering and bus transceivers.
For engineers reviewing the 74AC11240PWRG4 datasheet, 74AC11240PWRG4 pinout, 74AC11240PWRG4 application, or 74AC11240PWRG4 equivalent, key selection criteria include 3-state output timing (tPLH/tPHL ≤ 7.5 ns at 5 V), symmetrical OE control, latch-up immunity (500 mA typical at 125°C), and TSSOP-24 package compatibility with high-density routing.
Technical Context
The 74AC11240PWRG4 implements two independent 4-bit inverting buffers, each with dedicated active-low OE input controlling high-impedance output states. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process enables fast switching while maintaining low noise via center-pin VCC/GND configuration.
It supports rail-to-rail input/output voltage operation (0–VCC), exhibits symmetrical propagation delays (tPLH ≈ tPHL), and provides defined timing behavior across VCC = 3.3 V ±0.3 V and 5 V ±0.5 V supply conditions-with tPZH/tPLZ < 12 ns and tPHZ/tPLZ < 8 ns at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V logic compatibility |
| Output Drive | ±24 mA at VCC = 5 V - sufficient to drive 50-pF loads with controlled edge rates and minimal signal distortion |
| Propagation Delay | tPLH/tPHL ≤ 7.5 ns at VCC = 5 V - enables reliable operation in high-speed address/data bus applications up to ~100 MHz |
| 3-State Enable Time | tPZH/tPLZ ≤ 9.2 ns at VCC = 5 V - ensures rapid bus release for time-critical multiplexed systems |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - provides 0.8 V noise margin for TTL-compatible input driving |
| Latch-Up Immunity | 500 mA typical at 125°C - meets stringent industrial reliability requirements without external protection circuitry |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial ambient environments without derating |
Pinout & Package
TSSOP-24 package (PW drawing), 0.65 mm pitch, 7.8 mm × 4.4 mm body, 1.2 mm max height, exposed pad not present, RoHS-compliant green finish (CU NIPDAU), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1A1–1A4 Inputs | First 4-bit inverting data inputs; routed to corresponding Y outputs when 1OE is low |
| 5 | 1OE | Active-low enable for first 4-bit section; high = high-Z outputs, low = enabled inverted pass-through |
| 6–9 | 1Y1–1Y4 Outputs | Inverted outputs of first section; 3-state capable with controlled rise/fall times |
| 10, 11, 12, 13 | 2A1–2A4 Inputs | Second 4-bit inverting data inputs; independent of first section |
| 14 | 2OE | Active-low enable for second 4-bit section; fully decoupled timing and control from 1OE |
| 15–18 | 2Y1–2Y4 Outputs | Inverted outputs of second section; flow-through layout minimizes trace crossovers |
| 19, 20, 21, 22 | GND | Four dedicated ground pins - reduce ground bounce and improve noise immunity in high-speed switching |
| 23, 24 | VCC | Two dedicated power pins - symmetric placement lowers supply impedance and suppresses simultaneous switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output pin alignment (e.g., A1→Y1 adjacent) eliminates layer jumps and reduces parasitic inductance on PCB |
| Center-pin VCC/GND | Dual VCC (pins 23–24) and quad GND (pins 19–22) minimize supply loop area and high-frequency noise coupling |
| EPIC CMOS process | 1-µm fabrication enables 5.5 V tolerance, low static current (ICC ≤ 80 µA), and robust ESD performance (±2 kV HBM) |
| Symmetrical OE control | Separate 1OE/2OE inputs allow independent gating of each 4-bit section - essential for partial bus isolation |
| High fan-out capability | Drives ≥10 LSTTL loads or 50-pF capacitive loads without external buffering - reduces component count in dense systems |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash devices sharing a common data bus. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fan-out expansion, and 3-state isolation during bus arbitration. Use Value: Enables clean address propagation with sub-8 ns delay and simultaneous disable of all outputs via OE control-preventing bus contention during memory access switching. |
Use Scenario: Bidirectional data bus isolation between a CPU and peripheral ICs (e.g., UART, ADC) in a shared parallel interface. IC Role / Device Role / Timing Role: Dual-section 3-state driver managing direction-controlled data flow with independent OE signals for transmit/receive separation. Use Value: Eliminates need for discrete direction-control logic by allowing one section to drive while the other remains high-Z-reducing timing skew and layout complexity. |
| Industrial I/O Expansion | Legacy System Bus Interface |
|
Use Scenario: Extending GPIO count of a PLC controller to drive LED indicators, relay coils, or opto-isolator inputs across long PCB traces. IC Role / Device Role / Timing Role: High-current (±24 mA) inverting buffer translating MCU logic levels to robust industrial output signals. Use Value: Delivers full 5 V swing into 500 Ω loads with guaranteed VOL ≤ 0.44 V and VOH ≥ 4.94 V-ensuring noise-immune signaling over noisy factory environments. |
Use Scenario: Interfacing modern low-power MCUs with legacy 5 V TTL peripherals (e.g., older DACs, display controllers) requiring strict voltage thresholds. IC Role / Device Role / Timing Role: Voltage-tolerant buffer maintaining TTL-compatible VIH/VIL margins while operating from 3.3 V or 5 V supplies. Use Value: Supports mixed-supply designs without level shifters-VIH = 3.15 V at 4.5 V VCC gives >0.8 V noise margin against 2.4 V TTL high threshold. |
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 logic family, identical pinout (TSSOP-20), but non-inverting/inverting dual 4-bit configuration with shared OE | Lacks independent OE per section; unsuitable where asymmetric bus gating is required | Select only if unified enable control suffices and pin count reduction (20-pin vs. 24-pin) is prioritized |
| 74LVC240APW | Lower voltage operation (1.65–3.6 V), higher speed (tPD ≤ 4.2 ns), but reduced drive (±24 mA @ 3.3 V only) and no 5 V tolerance | Not compatible with 5 V systems; requires level-shifting when interfacing with legacy 5 V peripherals | Prefer for new 3.3 V-only designs demanding lowest propagation delay and dynamic power |
Compared with SN74AC240PWR and 74LVC240APW, the 74AC11240PWRG4 uniquely offers independent OE control per 4-bit section, 5.5 V absolute maximum rating, and proven industrial temperature stability-making it the only choice for mixed-voltage, fault-isolated bus architectures.
Availability
74AC11240PWRG4 is available at Aetrix Electronics and suitable for memory subsystem design, industrial I/O expansion, and legacy bus interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74AC11240PWRG4 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, precision, and industrial-grade qualification.
The 74AC11240PWRG4 belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-noise digital interfacing in industrial control, instrumentation, and computing infrastructure.
FAQ
What is the maximum supply voltage rating for the 74AC11240PWRG4?
The 74AC11240PWRG4 has an absolute maximum supply voltage (VCC) rating of 6 V. However, its recommended operating range is 3 V to 5.5 V. Operation above 5.5 V voids functional guarantees and risks permanent damage, even if within the 6 V absolute limit-designs must maintain VCC ≤ 5.5 V under all conditions including transients.
Does the 74AC11240PWRG4 support 3.3 V logic systems?
Yes, the 74AC11240PWRG4 is fully specified for 3.3 V operation (VCC = 3 V to 3.6 V). At 3 V, it delivers VOH ≥ 2.58 V and VOL ≤ 0.44 V with 12 mA drive, meeting standard 3.3 V LVTTL thresholds. Input thresholds scale proportionally (VIH = 2.1 V min), ensuring interoperability with 3.3 V microcontrollers and FPGAs.
How does the flow-through pinout of the 74AC11240PWRG4 improve PCB layout?
The 74AC11240PWRG4 uses a flow-through pin arrangement-inputs and corresponding outputs are placed on opposite sides of the TSSOP-24 package (e.g., 1A1 on pin 1, 1Y1 on pin 6). This allows straight trace routing without vias or layer changes, reducing parasitic inductance, minimizing crosstalk, and simplifying high-density board layouts in memory and bus applications.
Can both output-enable inputs (1OE and 2OE) be tied together in the 74AC11240PWRG4?
Yes, 1OE and 2OE can be connected to a single control signal, enabling or disabling both 4-bit sections simultaneously. However, doing so forfeits the device's key advantage: independent section control. When tied, the 74AC11240PWRG4 behaves like a standard octal buffer-not a dual-gated solution-so this configuration should only be used when full 8-bit synchronization is required.
Is the 74AC11240PWRG4 pin-compatible with other TSSOP-24 logic devices?
No, the 74AC11240PWRG4 has a unique pin assignment optimized for flow-through routing and noise reduction (e.g., four GND pins at pins 19–22, dual VCC at 23–24). It is not pin-compatible with generic TSSOP-24 logic ICs such as octal latches or transceivers-PCB layout must follow the specific 74AC11240PWRG4 pin map provided in the TI datasheet SCAS448A.
74AC11240PWRG4 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
74AC11240PWRG4 FAQ
1.How can I place an order for 74AC11240PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11240PWRG4 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 74AC11240PWRG4 reliable?
The price and inventory of 74AC11240PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11240PWRG4 is usually 5 days.
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74AC11240PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11240PWRG4 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 74AC11240PWRG4?
For technical support, including 74AC11240PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11240PWRG4 requirements.
6.How does Aetrix verify that 74AC11240PWRG4 is sourced from the original manufacturer or authorized distributors?
All 74AC11240PWRG4 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 74AC11240PWRG4 meets industry standards.
7.What is the process for return or replacement of 74AC11240PWRG4?
All 74AC11240PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11240PWRG4, 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 74AC11240PWRG4 part is unused and in its original packaging.
Return procedure for 74AC11240PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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