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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74ABT16540DLR

Name: SN74ABT16540DLR
Brand: Texas Instruments
SKU: SN74ABT16540DLR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ABT16540DLR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74ABT16540DLR.pdf

Description:: BUS DRIVER, ABT SERIES, 8-BIT

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74ABT16540 from Texas Instruments is a 16-bit noninverting buffer/driver with dual 3-state outputs, designed for high-speed bus interface in wide-data-path systems. It operates at 4.5–5.5 V, delivers ±32-mA/±64-mA drive strength, features flow-through pinout, and is rated for –40°C to 85°C industrial temperature range.

For engineers reviewing the SN74ABT16540 datasheet, SN74ABT16540 pinout, SN74ABT16540 application, or SN74ABT16540 equivalent, key selection criteria include its dual 8-bit independent 3-state control (OE1/OE2), distributed V_CC/GND layout for noise suppression, and high-drive BiCMOS output capability in the DL package.

Technical Context

The SN74ABT16540 implements two independent 8-bit sections, each with active-low 2-input AND-gated output-enable logic (OE1/OE2). Outputs enter high-impedance state if either OE input is high, enabling flexible bus arbitration. Its EPIC-II^B BiCMOS process reduces power while maintaining TTL-compatible voltage thresholds (V_IL = 0.8 V, V_VIH = 2 V).

Propagation delays are tightly controlled: t_PLH/t_PHL ≤ 4.2 ns at 5 V, and enable/disable times (t_PZH, t_PZL, t_PHZ, t_PLZ) range from 1.1 ns to 6.0 ns under CL = 50 pF. The device uses distributed V_CC and GND pins across the 48-pin DL package to minimize simultaneous switching noise.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and mixed-voltage bus systems.
I_O Drive Strength	–32 mA I_OH, +64 mA I_OL - Supports heavy capacitive loads and fast edge rates without external buffering.
t_PLH/t_PHL	≤ 4.2 ns at V_CC = 5 V, C_L = 50 pF - Enables reliable operation in >200-MHz data bus environments.
3-State Enable Logic	2-input AND with active-low OE1/OE2 - Allows independent control of each 8-bit section for multi-master arbitration.
Operating Temperature	–40°C to +85°C - Qualified for industrial-grade embedded and computing applications.
Input Clamp Current	–18 mA - Protects inputs against transient overvoltage events per JEDEC JESD-17 latch-up spec.
Package Thermal Dissipation	1.2 W (DL package at T_A = 55°C) - Supports sustained high-speed switching without thermal derating in compact layouts.

Pinout & Package

The SN74ABT16540 is housed in a 48-pin shrink small-outline (DL) package with 300-mil body width and 0.025-inch lead pitch. Pin numbering follows standard top-view orientation with corner pin 1 marked.

Pin/Terminal	Circuit Role	Design Meaning
1OE1, 1OE2, 2OE1, 2OE2	Active-low 3-state enable inputs	AND-gated control per 8-bit section; tie to V_CC via pullup for power-up high-Z safety.
1A1–1A8, 2A1–2A8	Data inputs	Noninverting inputs for respective 8-bit channels; TTL-compatible thresholds.
1Y1–1Y8, 2Y1–2Y8	Buffered outputs	High-drive 3-state outputs with flow-through routing to simplify PCB trace routing.
V_CC (Pins 7, 18, 28, 39)	Power supply	Distributed V_CC pins reduce IR drop and supply noise during high-frequency switching.
GND (Pins 4, 11, 21, 32, 45)	Ground reference	Five dedicated GND pins provide low-inductance return paths for all output banks.

Key Features

Feature	Design Value
EPIC-II^B BiCMOS Process	Reduces dynamic power vs. bipolar-only designs while retaining TTL drive strength and speed.
Flow-Through Architecture	Input and output pins positioned on opposite sides of package to minimize layer transitions and crosstalk.
Distributed V_CC/GND Pins	Four V_CC and five GND pins suppress ground bounce (V_OLP < 1 V) and improve signal integrity.
High-Drive Output Capability	–32 mA I_OH / +64 mA I_OL enables direct driving of 50-pF buses at >100 MHz without repeaters.
Latch-Up Immunity	Exceeds 500 mA per JEDEC JESD-17 - ensures robustness in noisy industrial environments.

Applications

Backplane Data Bus Interface	Industrial PLC I/O Module
Use Scenario: Bidirectional data transfer between CPU and peripheral cards across a 16-bit parallel backplane with stub lengths up to 15 cm. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating and strengthening signals between bus segments; enables hot-swap-capable slot arbitration. Use Value: High drive strength and sub-5-ns propagation delay maintain signal fidelity at 20+ MHz bus clock rates without added termination or repeaters.	Use Scenario: Interfacing microcontroller GPIOs to 24-V discrete I/O terminals in modular programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer between low-voltage logic and optocoupler-driven field-side circuits. Use Value: Robust 500-mA latch-up immunity and industrial temperature rating ensure reliability in electrically noisy factory-floor environments.
Memory Expansion Subsystem	Test Equipment Digital Pattern Generator
Use Scenario: Expanding local memory bandwidth in FPGA-based embedded systems using external SRAM or Flash with 16-bit data bus. IC Role / Device Role / Timing Role: Bidirectional bus driver managing data flow between processor and memory; 3-state control synchronizes with memory read/write strobes. Use Value: Dual independent OE controls allow interleaved access to upper/lower memory banks, improving effective throughput by 30%.	Use Scenario: Generating precise 16-bit parallel stimulus patterns for IC functional testing at speeds up to 100 MHz. IC Role / Device Role / Timing Role: Output driver stage delivering clean, fast-rising/falling edges to DUT pins with minimal skew across all bits. Use Value: Matched propagation delays (<0.3 ns skew) and low ground bounce (<1 V) preserve timing margins critical for high-speed digital test vectors.

Backplane Data Bus Interface

Industrial PLC I/O Module

Use Scenario: Bidirectional data transfer between CPU and peripheral cards across a 16-bit parallel backplane with stub lengths up to 15 cm.

IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating and strengthening signals between bus segments; enables hot-swap-capable slot arbitration.

Use Value: High drive strength and sub-5-ns propagation delay maintain signal fidelity at 20+ MHz bus clock rates without added termination or repeaters.

Use Scenario: Interfacing microcontroller GPIOs to 24-V discrete I/O terminals in modular programmable logic controllers.

IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer between low-voltage logic and optocoupler-driven field-side circuits.

Use Value: Robust 500-mA latch-up immunity and industrial temperature rating ensure reliability in electrically noisy factory-floor environments.

Memory Expansion Subsystem

Test Equipment Digital Pattern Generator

Use Scenario: Expanding local memory bandwidth in FPGA-based embedded systems using external SRAM or Flash with 16-bit data bus.

IC Role / Device Role / Timing Role: Bidirectional bus driver managing data flow between processor and memory; 3-state control synchronizes with memory read/write strobes.

Use Value: Dual independent OE controls allow interleaved access to upper/lower memory banks, improving effective throughput by 30%.

Use Scenario: Generating precise 16-bit parallel stimulus patterns for IC functional testing at speeds up to 100 MHz.

IC Role / Device Role / Timing Role: Output driver stage delivering clean, fast-rising/falling edges to DUT pins with minimal skew across all bits.

Use Value: Matched propagation delays (<0.3 ns skew) and low ground bounce (<1 V) preserve timing margins critical for high-speed digital test vectors.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ABT162244DLR	Inverting output polarity; identical pinout, drive strength, and timing specs.	Requires logic inversion in upstream design; unsuitable where signal polarity must be preserved.	Select when system-level logic allows or requires inverted outputs to simplify gate count.
SN74LVC16244ADLR	3.3-V only operation (1.65–3.6 V); lower drive (–24/+24 mA); CMOS process.	Not interoperable with 5-V buses; requires level translation if interfacing legacy 5-V peripherals.	Prefer for new 3.3-V-only designs prioritizing ultra-low static power and smaller footprint.

Compared with SN74ABT162244DLR and SN74LVC16244ADLR, the SN74ABT16540 uniquely provides noninverting 5-V operation with highest drive strength and industrial temperature support-making it optimal for upgrading legacy 5-V backplanes and noise-critical industrial interfaces.

Availability

SN74ABT16540 is available at Aetrix Electronics and suitable for industrial PLCs, test equipment pattern generators, memory expansion subsystems, and backplane data bus interfaces requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT16540 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, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74ABT16540 belongs to TI's Widebus™ family of high-speed bus-interface logic, engineered specifically for noise-resilient, high-density 5-V data-path expansion in industrial control and computing infrastructure.

FAQ

What is the recommended power-up sequence for the SN74ABT16540 to avoid bus contention?

TI recommends tying both OE1 and OE2 to V_CC through a pullup resistor (value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp-up. This prevents unintended driving of the bus before system logic initializes. The SN74ABT16540 does not require strict V_CC/OE sequencing, but pullup biasing is mandatory for safe power-on behavior. Always verify resistor value against the driver's I_OL spec in the SN74ABT16540 datasheet.

Does the SN74ABT16540 support hot-swap operation on live 5-V buses?

The SN74ABT16540 supports hot-swap operation when used with proper current-limiting and bus-isolation design practices. Its absolute maximum ratings allow V_CC to be applied before or after signal inputs, and its 500-mA latch-up immunity per JESD-17 provides margin against transient faults. However, TI does not guarantee hot-swap functionality without external protection circuitry; always implement series resistors and TVS diodes per application requirements for the SN74ABT16540.

Can the SN74ABT16540 be operated at 3.3 V?

No-the SN74ABT16540 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, VIH and VOL thresholds fall outside guaranteed logic levels, and output drive strength degrades significantly. For 3.3-V systems, TI recommends the SN74LVC16244ADLR instead. Operating the SN74ABT16540 below 4.5 V risks metastability, increased propagation delay, and potential bus contention due to undefined output states.

How many SN74ABT16540 devices can safely share a single 5-V rail on a PCB?

Based on the SN74ABT16540's typical ICC of 32 mA (all outputs enabled) and 2 mA (all disabled), and assuming a 1.2-W thermal limit per DL package, up to four SN74ABT16540 devices can share a well-decoupled 5-V rail in an industrial ambient (≤55°C). Each device requires ≥10 µF bulk capacitance plus 0.1 µF ceramic per V_CC pin. Thermal simulation and voltage-drop analysis are required for higher-density deployments involving the SN74ABT16540.

What is the maximum capacitive load the SN74ABT16540 can drive while maintaining 4.2-ns propagation delay?

The SN74ABT16540 maintains t_PLH/t_PHL ≤ 4.2 ns only at C_L = 50 pF, as specified in the switching characteristics table. At 100 pF, delay increases to ~6.5 ns; at 200 pF, it exceeds 10 ns. For loads >50 pF, use series termination or reduce clock frequency. The SN74ABT16540's drive strength remains sufficient, but timing margins degrade predictably with increasing C_L.

SN74ABT16540DLR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74ABT16540DLR FAQ

1.How can I place an order for SN74ABT16540DLR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ABT16540DLR 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 SN74ABT16540DLR reliable?

The price and inventory of SN74ABT16540DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16540DLR is usually 5 days.

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SN74ABT16540DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ABT16540DLR 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 SN74ABT16540DLR?

For technical support, including SN74ABT16540DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16540DLR requirements.

6.How does Aetrix verify that SN74ABT16540DLR is sourced from the original manufacturer or authorized distributors?

All SN74ABT16540DLR 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 SN74ABT16540DLR meets industry standards.

7.What is the process for return or replacement of SN74ABT16540DLR?

All SN74ABT16540DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16540DLR, 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 SN74ABT16540DLR part is unused and in its original packaging.

Return procedure for SN74ABT16540DLR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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