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Texas Instruments 74ACT16240DL
- Part No.:
- 74ACT16240DL
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16240DL.pdf
- Description:
- IC BUFF INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:187
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Product details
Overview
74ACT16240DL from Texas Instruments is a 16-bit inverting buffer/driver with 3-state outputs, designed for memory address driving, bus interfacing, and clock distribution in high-density digital systems. It operates from 4.5 V to 5.5 V, delivers ±24 mA output drive, supports –40°C to 85°C industrial temperature range, and features symmetrical active-low OE inputs per 4-bit section. It is used in PCB-level bus buffering where flow-through pinout minimizes trace crossovers.
For engineers reviewing the 74ACT16240DL datasheet, 74ACT16240DL pinout, 74ACT16240DL application, or 74ACT16240DL equivalent, this page provides verified package mapping (SSOP-48 DL), confirmed electrical specs (VOH ≥ 3.94 V @ 4.5 V, tPLH ≤ 8.5 ns), functional partitioning (four independent 4-bit sections), and real-world timing behavior under 50-pF load conditions.
Technical Context
The 74ACT16240DL implements four identical 4-bit inverting buffer sections, each with dedicated active-low output-enable (OE) control. Each section accepts TTL-compatible inputs (VIH = 2 V min) and drives CMOS/TTL loads with rail-to-rail output swing (0–VCC).
Its EPIC™ 1-µm CMOS process enables 500-mA latch-up immunity at 125°C and distributed VCC/GND pins to suppress simultaneous switching noise. The flow-through architecture places inputs on one side and outputs on the opposite side of the 48-pin SSOP package, optimizing signal routing on dense PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL/CMOS logic rails and tolerates supply ripple without functional degradation. |
| Output Drive | ±24 mA - Sufficient to directly drive 10 LSTTL loads or terminate short stubs on shared buses without external buffers. |
| Propagation Delay | tPLH ≤ 8.5 ns @ 5 V - Enables reliable operation in 100-MHz bus cycles with margin for setup/hold timing. |
| 3-State Enable Time | tPZH ≤ 12 ns @ 5 V - Guarantees fast bus release during multi-master arbitration or dynamic bus sharing. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Allows direct interface with legacy 74LS/74ALS devices without level-shifting. |
| Power Dissipation | 1.2 W max @ TA = 55°C - Supports continuous operation in thermally constrained industrial enclosures with natural convection cooling. |
| Operating Temperature | –40°C to +85°C - Qualified for use in industrial automation, telecom line cards, and embedded control systems. |
Pinout & Package
74ACT16240DL is housed in a 48-pin shrink small-outline package (SSOP-DL), 300-mil body width, 25-mil pin pitch, with gull-wing leads. The package uses distributed power/ground pins (VCC at pins 7, 20, 31, 42; GND at pins 4, 10, 15, 23, 28, 34, 39, 45) to reduce simultaneous switching noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24, 25, 48 | 1OE, 2OE, 3OE, 4OE | Active-low output-enable controls for four independent 4-bit sections; enables/disables respective Y outputs simultaneously. |
| 47–43, 41–37, 36–32, 30–26 | 1A1–1A4, 2A1–2A4, 3A1–3A4, 4A1–4A4 | Input terminals for each 4-bit section; TTL-compatible, internally pulled neither high nor low. |
| 2–6, 8–12, 13–17, 19–23 | 1Y1–1Y4, 2Y1–2Y4, 3Y1–3Y4, 4Y1–4Y4 | Inverting 3-state outputs; high-impedance when corresponding OE is high; driven low/high when OE is low. |
| 4, 10, 15, 23, 28, 34, 39, 45 | GND | Eight ground connections distributed across package perimeter to minimize ground bounce and improve signal integrity. |
| 7, 20, 31, 42 | VCC | Four VCC connections placed adjacent to GND pairs to form local decoupling loops and reduce supply impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left/right edges and outputs on opposite side - eliminates layer jumps and reduces vias in high-speed bus routing. |
| Distributed VCC/GND | Four VCC and eight GND pins interleaved across package - lowers effective power-supply inductance and suppresses ΔI/Δt noise. |
| EPIC™ process technology | 1-µm CMOS with implanted wells - achieves 500-mA latch-up immunity and stable operation up to 125°C junction temperature. |
| 3-state symmetry | Four independent OE inputs with identical timing (tPZH/tPLZ ≤ 12 ns) - enables precise staggered bus enable/disable sequencing. |
| TTL input compatibility | VIH = 2 V min, VIL = 0.8 V max - allows direct connection to 74LS, 74ALS, and microcontroller GPIO without external biasing. |
Applications
| Memory Address Buffering | Backplane Bus Driver |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash chips on a shared memory bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer that isolates address latches during bus contention and enables clean address transitions. Use Value: Symmetrical tPLH/tPHL (≤8.5 ns) ensures deterministic address setup time; distributed VCC/GND prevents address glitches during high-current switching. |
Use Scenario: Interfacing a CPU local bus to a 16-bit passive backplane carrying multiple peripheral slots. IC Role / Device Role / Timing Role: Bidirectional bus driver with section-wise OE control, allowing dynamic slot selection without bus contention. Use Value: Four independent OE inputs permit selective activation of peripheral segments; ±24 mA drive sustains signal integrity over 15-cm backplane traces. |
| Industrial I/O Expansion | Legacy System Interface |
|
Use Scenario: Expanding PLC I/O capacity by buffering parallel data paths between FPGA and opto-isolated output banks. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer translating FPGA CMOS outputs to industrial 5-V logic levels. Use Value: TTL-compatible inputs accept 3.3-V FPGA outputs with margin; 1.2-W thermal rating supports continuous operation in sealed DIN-rail enclosures. |
Use Scenario: Replacing obsolete 74F240 in retrofitted avionics test equipment requiring drop-in reliability upgrades. IC Role / Device Role / Timing Role: Pin-compatible 3-state inverting buffer with improved noise immunity and latch-up resistance. Use Value: Identical pinout and logic function to 74F240; enhanced 500-mA latch-up immunity meets DO-254 robustness requirements for flight-critical subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT16240DGGR | Same logic function and AC specs, but in TSSOP-48 package (6.1 mm × 12.5 mm vs DL's 7.5 mm × 15.9 mm); lower profile, tighter pitch (0.5 mm vs 0.635 mm). | Better suited for space-constrained consumer electronics; requires requalification of solder paste volume and reflow profile. | Select when board area is limited and JEDEC-standard TSSOP assembly infrastructure is available. |
| 74LVC16240ADGG | Lower voltage operation (1.65–3.6 V), CMOS-only inputs (VIH = 70% VCC), reduced drive (±24 mA @ 3.3 V only), no TTL compatibility. | Designed for mixed-voltage 3.3-V systems; incompatible with 5-V buses or legacy TTL sources without level translation. | Choose only for new 3.3-V designs where power efficiency and smaller footprint outweigh 5-V interoperability needs. |
Compared with SN74ACT16240DGGR and 74LVC16240ADGG, the 74ACT16240DL uniquely combines 5-V TTL compatibility, industrial temperature range, SSOP-DL mechanical robustness, and proven latch-up immunity-making it the preferred choice for legacy-system upgrades and harsh-environment industrial control.
Availability
74ACT16240DL is available at Aetrix Electronics and suitable for industrial control systems, telecom line-card designs, and legacy system refurbishment requiring stable component supply and long-term obsolescence mitigation.
Supply support for 74ACT16240DL 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 74ACT16240DL belongs to TI's Widebus™ family of high-density bus-interface ICs, engineered specifically to increase logic density and reduce PCB layer count in memory and bus-intensive systems.
FAQ
What is the operating voltage range for the 74ACT16240DL?
The 74ACT16240DL operates from 4.5 V to 5.5 V DC. This range ensures compatibility with standard 5-V logic families and accommodates typical power-supply tolerances in industrial environments. Operation outside this range may cause undefined behavior or permanent damage, as specified in the absolute maximum ratings table.
Does the 74ACT16240DL support TTL-level inputs?
Yes, the 74ACT16240DL features TTL-voltage-compatible inputs with VIH = 2 V minimum and VIL = 0.8 V maximum. This allows direct interfacing with legacy 74LS and 74ALS devices without external level-shifting circuitry, preserving signal integrity and reducing BOM count.
How many independent 3-state sections does the 74ACT16240DL contain?
The 74ACT16240DL contains four independent 4-bit sections, each with its own active-low output-enable input (1OE through 4OE). This architecture enables granular bus control-for example, enabling only the address section while holding data lines in high-impedance during memory read/write cycles.
What package type is used for the 74ACT16240DL?
The 74ACT16240DL uses a 48-pin shrink small-outline package (SSOP-DL), measuring 7.5 mm × 15.9 mm with 0.635-mm pin pitch. Its flow-through pinout and distributed VCC/GND pins are optimized for low-noise, high-density PCB layouts in industrial and telecom applications.
Is the 74ACT16240DL pin-compatible with older 74F240 devices?
Yes, the 74ACT16240DL maintains identical pinout and logic functionality with the 74F240, including inverting 3-state behavior and section-wise OE control. However, it improves upon the F-series with higher latch-up immunity (500 mA vs. ~200 mA), wider voltage tolerance, and enhanced noise suppression via distributed power pins.
74ACT16240DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
74ACT16240DL FAQ
1.How can I place an order for 74ACT16240DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16240DL 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 74ACT16240DL reliable?
The price and inventory of 74ACT16240DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16240DL is usually 5 days.
3.What payment methods are accepted for 74ACT16240DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16240DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16240DL?
74ACT16240DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16240DL 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 74ACT16240DL?
For technical support, including 74ACT16240DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16240DL requirements.
6.How does Aetrix verify that 74ACT16240DL is sourced from the original manufacturer or authorized distributors?
All 74ACT16240DL 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 74ACT16240DL meets industry standards.
7.What is the process for return or replacement of 74ACT16240DL?
All 74ACT16240DL units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16240DL, 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 74ACT16240DL part is unused and in its original packaging.
Return procedure for 74ACT16240DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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