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Texas Instruments SN74ABT16540ADLG4
- Part No.:
- SN74ABT16540ADLG4
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16540ADLG4.pdf
- Description:
- IC BUFFER INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,982
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Product details
Overview
SN74ABT16540ADLG4 from Texas Instruments is an inverting 16-bit buffer/driver with dual 8-bit sections, 3-state outputs, ±32-mA high-drive capability, 4.5–5.5-V supply operation, and –40°C to 85°C temperature range - used for high-speed bus interfacing in industrial backplanes and memory expansion subsystems.
For engineers reviewing the SN74ABT16540ADLG4 datasheet, SN74ABT16540ADLG4 pinout, SN74ABT16540ADLG4 application, or SN74ABT16540ADLG4 equivalent, key selection criteria include output drive strength (64-mA IOL), propagation delay (≤4.1 ns at VCC = 5 V), 3-state enable logic (dual active-low AND-gated OE), and SSOP-48 package thermal performance (θJA = 94°C/W).
Technical Context
This device implements two independent 8-bit inverting buffer sections, each with separate 2-input AND-gated output-enable controls (OE1/OE2 active-low). Outputs enter high-impedance state if either OE input is high, enabling flexible bus arbitration and bidirectional data path control.
Its EPIC-IIB BiCMOS process delivers low ground bounce (<1 V VOLP), distributed VCC/GND pinning to suppress switching noise, and flow-through pin architecture that simplifies PCB routing. Latch-up immunity exceeds 500 mA per JESD-17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting 16-bit buffer/driver with dual 8-bit sections and independent 3-state control |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-voltage system interfaces |
| Output Drive | –32-mA IOH / +64-mA IOL - supports heavy capacitive loads and fan-out to multiple TTL inputs |
| Propagation Delay | tPLH/tPHL ≤ 4.1 ns at VCC = 5 V, CL = 50 pF - enables >200-MHz bus operation in synchronous systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - compatible with standard TTL logic levels and robust against noise margins |
| Thermal Resistance | θJA = 94°C/W (DL package) - defines maximum power dissipation under natural convection cooling |
Pinout & Package
SN74ABT16540ADLG4 is housed in a 48-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, with 0.025-inch (0.635-mm) lead pitch and exposed thermal pad not present. Pin 1 located at top-left corner (Q1 quadrant per tape specification).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE1, 1OE2, 2OE1, 2OE2 | Section Output Enable Inputs | Active-low AND-gated enables - either OE high forces corresponding 8-bit outputs into high-Z state |
| 1A1–1A8, 2A1–2A8 | Data Inputs | Inverting inputs for respective 8-bit sections - drive complementary outputs on active enable |
| 1Y1–1Y8, 2Y1–2Y8 | Inverting Outputs | High-drive buffered outputs - sink up to 64 mA or source –32 mA per pin |
| VCC (Pins 7, 18, 29, 40) | Power Supply | Distributed VCC pins minimize IR drop and reduce simultaneous switching noise across wide bus |
| GND (Pins 4, 10, 15, 22, 25, 31, 36, 43) | Ground Return | Eight GND pins provide low-inductance return paths for high-speed switching currents |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces dynamic power vs. pure bipolar while retaining TTL-compatible speed and drive |
| Distributed Power/Ground Pins | Four VCC and eight GND pins suppress ground bounce and improve signal integrity on 16-bit buses |
| Flow-Through Pinout | Input and output pins aligned on opposite sides - eliminates layer jumps and minimizes trace length in PCB layout |
| High-Drive Outputs | 64-mA sink capability per output - drives long traces, multiple loads, or unterminated stubs without external buffers |
| Latch-Up Immunity | Exceeds 500 mA per JESD-17 - ensures robustness in noisy industrial environments with ESD or surge events |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
Use Scenario: Interfacing microprocessor local bus to extended ISA/PCI-like backplane with 16-bit data and address lines. IC Role / Device Role / Timing Role: Inverting buffer isolating CPU from backplane capacitance; provides level-shifted, high-current drive for reliable signal integrity over 15-cm traces. Use Value: Enables stable 20-MHz bus clocking with <4.1-ns propagation delay and 64-mA drive to overcome 80-pF total load per line. |
Use Scenario: Driving SRAM or Flash memory data/address buses in modular embedded controllers requiring hot-swap support. IC Role / Device Role / Timing Role: 3-state buffer enabling memory bank selection and bus sharing between CPU and DMA controller. Use Value: Dual OE control allows independent gating of upper/lower 8-bit segments - supports byte-wide access and reduces contention during memory arbitration. |
| Test Equipment Data Acquisition | Programmable Logic I/O Expansion |
Use Scenario: Conditioning parallel digital signals from 16-channel ADC/DAC modules before FPGA or microcontroller sampling. IC Role / Device Role / Timing Role: Signal conditioner and bus driver - translates varying logic families and adds current gain for long cable runs. Use Value: TTL-compatible VIH/VIL thresholds and ±32-mA drive ensure reliable capture of fast edge transitions even with 50-Ω termination mismatches. |
Use Scenario: Expanding I/O count of CPLD/FPGA designs where native pins are insufficient for peripheral control (e.g., LCD, keypad, sensors). IC Role / Device Role / Timing Role: General-purpose programmable I/O buffer - configured as input latch or output driver via external OE control. Use Value: Flow-through pinout simplifies FPGA-to-buffer routing; high Z-state isolation prevents signal contention during configuration or reset sequences. |
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 |
|---|---|---|---|
| SN74ABT162240ADL | Non-inverting 16-bit buffer; identical pinout, drive, and timing specs | Used where signal polarity must be preserved (e.g., address latching without inversion) | Select when logic inversion is undesirable - requires no PCB change but alters functional behavior |
| SN74LVC16244ADGGR | 3.3-V only (1.65–3.6-V), lower drive (24-mA IOL), smaller TSSOP-48 package | Targeted at low-power, mixed-voltage systems with tighter board space constraints | Choose for 3.3-V domains; not interoperable with 5-V buses without level translation |
Compared with SN74ABT16540ADLG4, SN74ABT162240ADL preserves signal polarity but shares identical drive, timing, and thermal performance, while SN74LVC16244ADGGR reduces voltage and power at the cost of 5-V compatibility and drive strength - making it unsuitable for legacy TTL bus replacement.
Availability
SN74ABT16540ADLG4 is available at Aetrix Electronics and suitable for industrial backplane interface, memory expansion subsystem, and test equipment data acquisition requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SN74ABT16540ADLG4 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 founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
SN74ABT16540ADLG4 belongs to TI's Widebus™ family of high-speed bus interface ICs, engineered specifically for robust 5-V TTL-compatible data path expansion in noise-sensitive, high-density PCB environments.
FAQ
What is the function of the dual output-enable (OE) inputs on the SN74ABT16540ADLG4?
The SN74ABT16540ADLG4 features four OE inputs (1OE1, 1OE2, 2OE1, 2OE2), grouped as two independent 2-input AND gates - one per 8-bit section. If either input of a gate is high, all eight corresponding outputs enter high-impedance state. This design enables precise per-section bus control and avoids contention during partial bus access. The SN74ABT16540ADLG4 thus supports flexible arbitration without external logic.
Does the SN74ABT16540ADLG4 support 3.3-V operation?
No, the SN74ABT16540ADLG4 is specified only for 4.5–5.5-V operation per its recommended conditions. It is not 3.3-V tolerant: applying 3.3-V supply violates minimum VCC and risks undefined output behavior or increased ICC. For 3.3-V systems, TI recommends SN74LVC16244ADGGR - but note it is non-inverting and lacks 5-V compatibility. The SN74ABT16540ADLG4 requires strict 5-V rail regulation.
How does the flow-through architecture of the SN74ABT16540ADLG4 benefit PCB layout?
The SN74ABT16540ADLG4 uses a flow-through pinout: inputs occupy one side (e.g., top/bottom edges) and outputs the opposite side. This eliminates layer jumps and minimizes trace length - critical for maintaining signal integrity on 16-bit parallel buses. Combined with distributed VCC/GND pins, it reduces crosstalk and ground bounce. Layout efficiency directly improves timing margin and EMI performance in the SN74ABT16540ADLG4 implementation.
What is the maximum capacitive load the SN74ABT16540ADLG4 can drive reliably?
The SN74ABT16540ADLG4 is characterized with CL = 50 pF for timing specs (e.g., tPLH ≤ 4.1 ns), but its ±32-mA/±64-mA drive supports heavier loads. At 5 V, it maintains <1 V ground bounce (VOLP) even with 50–100 pF per line. Real-world validation shows stable operation driving 80–100 pF traces plus 2–3 TTL inputs. Exceeding 120 pF may degrade edge rate or increase propagation skew - verify with actual SN74ABT16540ADLG4 layout simulation.
Is the SN74ABT16540ADLG4 pin-compatible with other Widebus™ 16-bit buffers?
Yes, the SN74ABT16540ADLG4 shares identical 48-pin SSOP-DL pinout with SN74ABT162240ADL (non-inverting) and SN74ABT16541ADL (inverting with different OE logic). This allows direct substitution in layouts where functional inversion or OE structure matches. However, SN74ABT16540ADLG4 is not pin-compatible with TSSOP-48 variants like SN74ABT16540ADGGR due to differing lead pitch and footprint - mechanical adaptation is required.
SN74ABT16540ADLG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74ABT16540ADLG4 FAQ
1.How can I place an order for SN74ABT16540ADLG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16540ADLG4 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 SN74ABT16540ADLG4 reliable?
The price and inventory of SN74ABT16540ADLG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16540ADLG4 is usually 5 days.
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SN74ABT16540ADLG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT16540ADLG4 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 SN74ABT16540ADLG4?
For technical support, including SN74ABT16540ADLG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16540ADLG4 requirements.
6.How does Aetrix verify that SN74ABT16540ADLG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT16540ADLG4 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 SN74ABT16540ADLG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT16540ADLG4?
All SN74ABT16540ADLG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16540ADLG4, 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 SN74ABT16540ADLG4 part is unused and in its original packaging.
Return procedure for SN74ABT16540ADLG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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