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Texas Instruments SN74AHC16540DL
- Part No.:
- SN74AHC16540DL
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC16540DL.pdf
- Description:
- IC BUFFER INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,369
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Product details
Overview
SN74AHC16540DL from Texas Instruments is a 16-bit noninverting buffer/driver with dual 3-state control (OE1/OE2), designed for high-speed bidirectional bus interfacing in wide-data-path systems. It operates from 2 V to 5.5 V, delivers ±8 mA output drive at 5 V, features flow-through pinout for optimized PCB layout, and is characterized for –40°C to 85°C industrial temperature range.
For engineers reviewing the SN74AHC16540DL datasheet, SN74AHC16540DL pinout, SN74AHC16540DL application, or SN74AHC16540DL equivalent, key selection criteria include its dual active-low 3-state enable architecture, distributed VCC/GND pins minimizing switching noise, latch-up immunity >250 mA, and SSOP-48 (DL) package compatibility with high-density routing constraints.
Technical Context
The SN74AHC16540DL implements two independent 8-bit noninverting buffers, each controlled by a 2-input AND gate with active-low OE1/OE2 inputs - either high disables all eight outputs into high-impedance. Its EPIC™ CMOS process enables rail-to-rail input/output swing and low dynamic power dissipation (Cpd = 13 pF at 5 V).
Signal integrity is enhanced by distributed power/ground pins across the 48-pin SSOP body and flow-through architecture aligning inputs on one side and outputs on the opposite - eliminating layer jumps and stubs in stripline routing. The device meets JESD 17 latch-up performance (>250 mA) and MIL-STD-883 ESD protection (>2000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V bus) |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to drive 50-pF loads with <10 ns propagation delay (tPLH/tPHL) |
| Propagation Delay | 3.7 ns (min) / 7 ns (max) at 5 V, 15-pF load - enables >100 MHz data rates in point-to-point buses |
| 3-State Enable Logic | AND of OE1 and OE2, both active-low - ensures fail-safe high-Z during power-up if OE tied to VCC via pullup |
| Input Thresholds | VIL = 1.65 V, VIH = 3.85 V at VCC = 5.5 V - provides 0.8 V noise margin for TTL-compatible inputs |
| Thermal Resistance | θJA = 63°C/W (DL package) - limits junction rise to ≤63°C above ambient at 100 mW dissipation |
Pinout & Package
SN74AHC16540DL uses a 48-pin Shrink Small-Outline Package (SSOP-DL), 12.6 mm × 6.1 mm body, 0.5 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant. Pin 1 marked with corner chamfer; seating plane defined per JEDEC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE1, 1OE2, 2OE1, 2OE2 | Active-low 3-state enable inputs (per 8-bit group) | AND-gated control: either OE high forces corresponding Y1–Y8 into high-Z - critical for bus arbitration |
| 1A1–1A8, 2A1–2A8 | Noninverting data inputs | Direct connection to upstream source; no inversion - preserves signal polarity across bus interface |
| 1Y1–1Y8, 2Y1–2Y8 | Noninverting buffered outputs | Drive downstream bus segments; output impedance <20 Ω ensures clean edge integrity into 50-Ω traces |
| VCC (Pins 7, 18, 28, 39) | Power supply | Distributed VCC pins reduce simultaneous switching noise (SSN) and improve PDN impedance uniformity |
| GND (Pins 4, 11, 21, 32, 45) | Ground reference | Five GND pins provide low-inductance return paths - essential for maintaining signal integrity at >50 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Inputs (A) on left side, outputs (Y) on right side - eliminates layer transitions and reduces trace length by up to 40% vs. folded layouts |
| Dual independent 3-state controls | Separate OE1/OE2 per 8-bit bank - enables selective gating of upper/lower byte without affecting other channel |
| EPIC™ CMOS process | Enhanced-performance implanted CMOS - achieves 5.5 V tolerance while maintaining AHC speed/power trade-off |
| Latch-up immunity | >250 mA per JESD 17 - prevents destructive failure during transient overvoltage or hot-insertion events |
| ESD protection | >2000 V HBM per MIL-STD-883 Method 3015 - protects against handling damage in manufacturing and field service |
Applications
| Memory Bus Interface | Industrial PLC Backplane |
|---|---|
Use Scenario: Interfacing a 16-bit microcontroller data bus to SRAM or Flash memory arrays with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional buffer isolating processor and memory domains; enables tristate-controlled read/write direction switching. Use Value: Flow-through pinout allows direct top-layer routing between MCU and memory; dual OE permits separate control of upper/lower byte for 8-bit access modes. | Use Scenario: Signal conditioning and level translation between CPU module and I/O expansion slots in modular programmable logic controllers. IC Role / Device Role / Timing Role: Wide-bus driver buffering parallel digital I/O signals across backplane connectors subject to crosstalk and ground bounce. Use Value: Distributed VCC/GND pins suppress simultaneous switching noise; ±8 mA drive sustains signal integrity over 15-cm backplane traces. |
| Test Equipment Data Acquisition | Automotive Diagnostic Interface |
Use Scenario: Capturing parallel sensor data streams (e.g., ADC outputs) into FPGA-based acquisition logic in benchtop test instruments. IC Role / Device Role / Timing Role: Input-side buffer presenting high-impedance load to analog front-end; output-side driver delivering clean edges to FPGA I/O banks. Use Value: 3.7 ns propagation delay at 5 V enables sampling synchronization within 10 ns jitter budget; 2-V min VCC supports low-power standby modes. | Use Scenario: Isolating diagnostic communication lines (e.g., K-Line or proprietary parallel debug ports) between vehicle ECU and external scan tools. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface between 3.3 V diagnostic controller and 5 V legacy ECU signaling rails. Use Value: 2-V to 5.5 V operation accommodates both modern low-voltage controllers and legacy 5 V automotive subsystems; latch-up immunity prevents field failures. |
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 |
|---|---|---|---|
| SN74AHCT16540DL | TTL-compatible inputs (VIH = 2 V min); otherwise identical pinout, timing, and drive | Required when interfacing to legacy 5 V TTL logic with marginal high-level voltage margins | Select SN74AHCT16540DL only if upstream drivers cannot guarantee ≥3.85 V VIH at VCC = 5.5 V |
| SN74LVCH16540ADL | Lower VCC range (1.65 V–3.6 V); higher speed (tPD = 2.8 ns typ at 3.3 V); different DC specs | Suitable for modern ultra-low-voltage systems but incompatible with 5 V buses | Choose SN74LVCH16540ADL only for 3.3 V-only designs requiring sub-3 ns delay and lower static current |
Compared with SN74AHC16540DL, SN74AHCT16540DL adds TTL input compatibility at no cost to layout or timing, while SN74LVCH16540ADL trades 5 V operation for 30% faster switching and 60% lower ICC - making the original optimal for mixed-voltage industrial backplanes where robustness and voltage flexibility outweigh raw speed.
Availability
SN74AHC16540DL is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory bus interfaces, automated test equipment, and automotive diagnostic modules requiring stable component supply across extended product lifecycles.
Supply support for SN74AHC16540DL 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 high-reliability interface ICs.
The SN74AHC16540DL belongs to TI's Widebus™ family of high-speed bus interface devices, engineered specifically for noise-resilient, high-density data path routing in industrial control, instrumentation, and communications infrastructure.
FAQ
What is the recommended power-up sequence for SN74AHC16540DL to avoid bus contention?
TI recommends tying both OE1 and OE2 to VCC through a pullup resistor (≤10 kΩ) during power-up. This ensures all outputs remain in high-impedance until firmware asserts valid control signals. The SN74AHC16540DL's internal structure guarantees no output state transition occurs before VCC reaches 1.5 V, preventing glitch-induced contention on shared buses.
Can SN74AHC16540DL drive a 50-pF capacitive load at 100 MHz without signal degradation?
Yes - at VCC = 5 V and CL = 50 pF, SN74AHC16540DL exhibits tPLH/tPHL ≤ 8 ns and tPZH/tPZL ≤ 10.5 ns, supporting clean 100 MHz clocked data transfer. Its ±8 mA drive strength and low output impedance (<20 Ω) maintain <10% overshoot on 50-Ω transmission lines, as verified in TI's SCLS331F characterization.
Does SN74AHC16540DL support hot-swap or live-insertion in backplane applications?
SN74AHC16540DL is not rated for hot-swap operation per IEEE 1394 or PCI standards. While its >250 mA latch-up immunity and >2000 V HBM ESD rating improve ruggedness, the absence of power-on reset circuitry or bus-isolation FETs means uncontrolled insertion can cause transient contention. Use external series resistors or dedicated hot-swap controllers when live insertion is required.
How does the dual OE architecture of SN74AHC16540DL differ from single-OE 16-bit buffers like SN74AHC16244?
Unlike SN74AHC16244 (single OE controlling all 16 outputs), SN74AHC16540DL splits control into two independent 8-bit groups (OE1 for Y1–Y8, OE2 for Y9–Y16). This enables byte-selective bus gating - e.g., reading lower byte while holding upper byte in high-Z - critical for partial-word memory accesses and multiplexed I/O protocols.
Is SN74AHC16540DL RoHS-compliant and lead-free?
Yes - SN74AHC16540DL is RoHS-compliant with lead-free NIPDAU (nickel/palladium/gold) terminal finish, MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), and peak reflow tolerance up to 260°C. TI's packaging documentation confirms full compliance with Directive 2011/65/EU and exemptions under Annex III.
SN74AHC16540DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74AHC16540DL FAQ
1.How can I place an order for SN74AHC16540DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC16540DL 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 SN74AHC16540DL reliable?
The price and inventory of SN74AHC16540DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC16540DL is usually 5 days.
3.What payment methods are accepted for SN74AHC16540DL?
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SN74AHC16540DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC16540DL 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 SN74AHC16540DL?
For technical support, including SN74AHC16540DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC16540DL requirements.
6.How does Aetrix verify that SN74AHC16540DL is sourced from the original manufacturer or authorized distributors?
All SN74AHC16540DL 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 SN74AHC16540DL meets industry standards.
7.What is the process for return or replacement of SN74AHC16540DL?
All SN74AHC16540DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC16540DL, 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 SN74AHC16540DL part is unused and in its original packaging.
Return procedure for SN74AHC16540DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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