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Texas Instruments SN74AHCT16240DGGR
- Part No.:
- SN74AHCT16240DGGR
- Manufacturer:
- Texas Instruments
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74AHCT16240DGGR.pdf
- Description:
- IC BUFFER INVERT 5.5V 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,594
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Product details
Overview
SN74AHCT16240DGGR from Texas Instruments is a 16-bit inverting buffer/driver with 3-state outputs, designed for high-density memory address, clock, and bus driver applications. It operates from 4.5 V to 5.5 V, supports TTL-level inputs, delivers ±8 mA output drive, and features symmetrical active-low OE inputs per 4-bit section. Its flow-through pinout minimizes PCB trace congestion in high-speed digital systems.
For engineers reviewing the SN74AHCT16240DGGR datasheet, SN74AHCT16240DGGR pinout, SN74AHCT16240DGGR application, or SN74AHCT16240DGGR equivalent, key selection criteria include guaranteed 3-state isolation (IOZ ≤ ±2.5 µA), propagation delay under 10 ns at 15 pF load, thermal resistance of 70°C/W in TSSOP-48, and compatibility with legacy TTL logic levels while using CMOS power efficiency.
Technical Context
This device implements four independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) control. All inputs are TTL-voltage compatible (VIH = 2 V min, VIL = 0.8 V max), enabling direct interfacing with 5-V TTL families without level-shifting.
Its EPIC™ (Enhanced-Performance Implanted CMOS) process ensures latch-up immunity >250 mA per JESD 17 and ESD protection >2000 V per MIL-STD-883 Method 3015. Distributed VCC/GND pins and flow-through architecture reduce switching noise and simplify PCB layout for synchronous bus systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across industrial 5-V rail tolerances. |
| Output Drive | ±8 mA - Sufficient to drive 50-pF loads with <11 ns propagation delay, supporting 20+ cm trace lengths on FR-4. |
| 3-State Leakage | ±2.5 µA max - Guarantees high-impedance integrity during bus contention or power sequencing. |
| Propagation Delay | 9.5 ns max (A→Y, CL = 50 pF) - Enables reliable timing in 50-MHz synchronous bus environments. |
| Input Compatibility | TTL-level (VIH ≥ 2 V, VIL ≤ 0.8 V) - Direct drop-in replacement for 74LS/74ALS bus drivers without interface circuitry. |
| Thermal Resistance | θJA = 70°C/W (TSSOP-48) - Supports continuous operation at 85°C ambient with moderate airflow or copper pour. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and data acquisition systems. |
Pinout & Package
TSSOP-48 (DGG) package: 12.6 mm × 6.2 mm × 1.2 mm body, 0.5-mm pitch, lead-free NiPdAu finish, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Independent control per 4-bit section; tie to VCC via pullup for power-up high-Z state. |
| 1A1–1A4, 2A1–2A4, etc. | Buffer input | 16 total TTL-compatible inputs grouped into four 4-bit sections; no internal termination required. |
| 1Y1–1Y4, 2Y1–2Y4, etc. | Inverting 3-state output | 16 buffered, inverted outputs; high-Z when corresponding OE is high; drives standard CMOS/TTL loads. |
| VCC (Pins 7, 24, 31, 48) | Power supply | Distributed VCC pins minimize simultaneous switching noise and IR drop across wide buses. |
| GND (Pins 4, 10, 15, 21, 27, 32, 38, 44) | Ground reference | Eight GND pins provide low-inductance return paths for all 16 outputs and internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state buffers | Four independent 4-bit sections enable flexible partitioning (e.g., 4× address nibbles or 2× 8-bit data lanes). |
| Flow-through pinout | Input and output pins aligned on opposite sides (e.g., A1/Y1 on same column) simplifies layer routing and reduces vias. |
| Distributed power/ground | Four VCC and eight GND pins suppress ground bounce and maintain signal integrity at >20 MHz toggle rates. |
| TTL-input compatibility | Accepts standard 5-V TTL logic thresholds without external biasing-enables mixed-logic-system integration. |
| Latch-up immunity | Exceeds 250 mA per JESD 17-ensures robustness in noisy industrial environments with transient coupling. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
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 3-state buffer isolating address signals during bus turnaround; OE synchronized with memory read/write strobes. Use Value: Prevents address bus contention during multi-chip access; 9.5 ns delay enables sub-100 ns memory cycle times at 50 MHz. | Use Scenario: Distributing a system clock to multiple peripheral controllers while maintaining edge integrity and skew control. IC Role / Device Role / Timing Role: Fan-out buffer with matched propagation delays across all 16 outputs; OE used for clock gating during low-power modes. Use Value: Delivers <1 ns inter-output skew (tsk(o)) at 50 pF load, preserving setup/hold margins for synchronous peripherals. |
| Bus Transceiver Interface | Legacy System Upgrade |
Use Scenario: Bidirectional data bus isolation between an FPGA and legacy parallel peripherals (e.g., LCD controllers, ADCs). IC Role / Device Role / Timing Role: Direction-controlled 16-bit transceiver using external OE logic; inverting function accommodates complementary bus protocols. Use Value: ±8 mA drive sustains signal integrity over 15-cm traces; 3-state leakage <2.5 µA prevents bus loading during idle states. | Use Scenario: Replacing obsolete 74LS640 or 74ALS240 buffers in aging industrial PLC backplanes without board redesign. IC Role / Device Role / Timing Role: Pin-compatible upgrade delivering identical logic function, TTL input thresholds, and 3-state behavior in same TSSOP-48 footprint. Use Value: Eliminates need for external level shifters or pullups; maintains full backward compatibility while reducing power by >80% vs. bipolar equivalents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT16244DGGR | Non-inverting outputs; otherwise identical voltage, timing, and packaging specs. | Required where bus polarity must be preserved (e.g., direct connection to non-inverting receivers). | Select when signal inversion is undesirable; verify downstream logic accepts non-inverted data path. |
| SN74LVC16244ADGGR | Lower VCC range (1.65–3.6 V); 3.3-V optimized; higher speed (tPD = 5.2 ns typ); not TTL-input compatible. | Suitable only in modern 3.3-V systems with LVTTL/LVCMOS interfaces; incompatible with 5-V TTL sources. | Choose for new 3.3-V designs requiring lower power and faster timing; avoid in mixed-voltage or legacy TTL environments. |
Compared with SN74AHCT16244DGGR and SN74LVC16244ADGGR, the SN74AHCT16240DGGR uniquely provides inverting logic with guaranteed TTL input compatibility and 5-V operation-making it the sole option for upgrading legacy 5-V bus systems requiring signal inversion and robust noise immunity.
Availability
SN74AHCT16240DGGR is available at Aetrix Electronics and suitable for industrial control panels, test equipment backplanes, and legacy system refurbishment requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74AHCT16240DGGR 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 decades of heritage in industry-standard logic families.
The SN74AHCT16240DGGR belongs to TI's Widebus™ family of high-density bus interface ICs, engineered specifically to replace legacy bipolar buffers in memory, clock, and data bus applications while delivering CMOS efficiency and TTL compatibility.
FAQ
What is the recommended power-up sequence for SN74AHCT16240DGGR to ensure 3-state safety?
TI specifies that OE inputs must be held high (inactive) during power-up to guarantee high-impedance outputs. For SN74AHCT16240DGGR, tie each OE pin to VCC through a pullup resistor (minimum value determined by driver sink capability). This prevents bus contention before system control logic initializes, especially critical in hot-swap or multi-rail systems where VCC ramps independently.
Does SN74AHCT16240DGGR support mixed-voltage operation between 3.3-V inputs and 5-V VCC?
No. SN74AHCT16240DGGR requires VI ≤ VCC and is specified only for TTL-compatible inputs (VIH ≥ 2 V, VIL ≤ 0.8 V) operating with VCC = 4.5–5.5 V. Applying 3.3-V logic signals directly violates the absolute maximum input voltage rating (VI ≤ VCC + 0.5 V) and risks damage or undefined behavior. Level translation is mandatory for 3.3-V input sources.
How does the flow-through pinout of SN74AHCT16240DGGR improve PCB layout versus traditional ZIF-style buffers?
The flow-through architecture of SN74AHCT16240DGGR aligns inputs and outputs on opposing edges (e.g., A1 on pin 47, Y1 on pin 2), enabling straight-layer routing without layer jumps or vias. This reduces trace inductance, improves signal integrity at high frequencies, and cuts layout time by up to 40% compared to zig-zag pinouts-particularly valuable in dense backplane or modular I/O card designs.
Can SN74AHCT16240DGGR drive a 50-pF load at 50 MHz without signal degradation?
Yes. SN74AHCT16240DGGR is characterized for tPLH/tPHL ≤ 10.5 ns and tPZH/tPHZ ≤ 13 ns at CL = 50 pF and VCC = 5 V. With ±8 mA drive strength and distributed grounding, it maintains clean edges and <1 ns inter-output skew (tsk(o)), supporting reliable 50-MHz clock or data distribution across typical FR-4 PCBs with controlled impedance traces.
Is SN74AHCT16240DGGR pin-compatible with older 74LS240 devices in TSSOP-48?
No. While SN74AHCT16240DGGR matches the logical function and electrical behavior of 74LS240, its TSSOP-48 (DGG) pinout differs fundamentally: 74LS240 uses 20-pin DIP/SOIC packages, and no 48-pin variant exists. However, SN74AHCT16240DGGR is a functional and footprint-compatible upgrade path when migrating legacy designs to surface-mount-provided the PCB is redesigned for the 48-pin TSSOP layout with proper thermal and grounding provisions.
SN74AHCT16240DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
SN74AHCT16240DGGR FAQ
1.How can I place an order for SN74AHCT16240DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT16240DGGR 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 SN74AHCT16240DGGR reliable?
The price and inventory of SN74AHCT16240DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT16240DGGR is usually 5 days.
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Once your SN74AHCT16240DGGR 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 SN74AHCT16240DGGR?
For technical support, including SN74AHCT16240DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT16240DGGR requirements.
6.How does Aetrix verify that SN74AHCT16240DGGR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT16240DGGR 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 SN74AHCT16240DGGR meets industry standards.
7.What is the process for return or replacement of SN74AHCT16240DGGR?
All SN74AHCT16240DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT16240DGGR, 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 SN74AHCT16240DGGR part is unused and in its original packaging.
Return procedure for SN74AHCT16240DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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