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STMicroelectronics 74LCX86TTR
- Part No.:
- 74LCX86TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LCX86TTR.pdf
- Description:
- IC GATE XOR 4CH 2-INP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,092
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Product details
Overview
74LCX86TTR from STMicroelectronics is a low-voltage CMOS quad 2-input XOR gate with 5V-tolerant inputs, operating from 2.0V to 3.6V supply, delivering 6.5ns max propagation delay at VCC = 3.0V, ±24mA output drive, and symmetrical output impedance - used in 3.3V logic interfacing with legacy 5V systems in industrial control I/O modules.
For engineers reviewing the 74LCX86TTR datasheet, 74LCX86TTR pinout, 74LCX86TTR application, or 74LCX86TTR equivalent, key selection criteria include 5V input tolerance, balanced tPLH/tPHL skew ≤1.0ns, PCI bus-level drive capability at 24mA, and TSSOP14 package compatibility with high-density PCB layouts.
Technical Context
The 74LCX86TTR implements four independent XOR logic functions using sub-micron C2MOS technology, enabling full 3.3V operation while accepting 0–5.5V input signals without level shifters. Its power-down protection ensures safe I/O behavior during VCC = 0V conditions.
All outputs exhibit matched rise/fall characteristics (tPLH ≅ tPHL) and low dynamic noise (VOLP ≤ 0.8V, VOLV ≥ −0.8V), supporting clean signal integrity in synchronous digital interfaces such as address/data parity checking and bus arbitration circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.0V to 3.6V - enables direct integration into 3.3V FPGA/CPU I/O domains without voltage translation |
| tPD Max | 6.5ns at VCC = 3.0V - supports >100MHz toggle rates in combinatorial logic paths |
| IOL / IOH Min | ±24mA at VCC = 3.0–3.6V - drives standard PCI bus loads and multiple 74LCX inputs |
| Input Voltage Range | 0V to 5.5V - allows direct connection to 5V TTL/CMOS outputs without external clamping |
| tOSLH / tOSHL Max | 1.0ns - ensures deterministic timing alignment across all four XOR outputs for synchronous sampling |
| ESD Rating | HBM > 2000V - meets industrial handling requirements without additional board-level protection |
Pinout & Package
TSSOP14 (Thin Shrink Small Outline Package, 4.4mm × 5.0mm body, 0.65mm pitch) - RoHS-compliant, ECOPACK®-certified lead-free package optimized for automated SMT assembly and thermal performance in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | 1A–4A | Independent XOR input A for each gate - accepts 0–5.5V logic levels regardless of VCC |
| 2, 5, 10, 13 | 1B–4B | Independent XOR input B for each gate - fully 5V tolerant with no current limiting required |
| 3, 6, 8, 11 | 1Y–4Y | Combinatorial XOR output per gate - actively driven high/low with matched impedance (|IOH| = IOL) |
| 7 | GND | Dedicated ground reference - decoupling capacitor placement adjacent minimizes switching noise coupling |
| 14 | VCC | Primary supply rail - must be stabilized between 2.0V–3.6V; powers all gates and I/O protection circuitry |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs | Supports mixed-voltage system integration without external level translators or resistive dividers |
| Symmetrical output drive | Ensures consistent edge rates and minimal duty cycle distortion in clock or data path applications |
| Power-down protection | Prevents back-driving and latch-up when VCC = 0V, critical for hot-swap and partial-power-down systems |
| Latch-up immunity | Exceeds 500mA per JESD17 - eliminates risk of destructive latch-up under transient overvoltage events |
Applications
| Industrial PLC I/O Expansion | PCI Bus Parity Generation |
|---|---|
|
Use Scenario: Adding isolated digital input channels to a 3.3V microcontroller-based PLC module receiving 5V sensor signals. IC Role / Device Role / Timing Role: XOR gate performing real-time signal inversion and parity calculation on 5V-tolerant inputs before 3.3V MCU sampling. Use Value: Eliminates need for discrete level-shifting components, reducing BOM count and layout area while maintaining <6.5ns timing margin. |
Use Scenario: Generating odd/even parity bits for 32-bit PCI data bus lines in an embedded host controller interface. IC Role / Device Role / Timing Role: Four parallel XOR gates compute byte-wise parity across 8-bit segments with matched propagation delays. Use Value: Achieves sub-7ns worst-case delay across all outputs, meeting PCI specification timing windows for parity validation. |
| Low-Power Sensor Interface Hub | Configurable Logic in FPGA Companion Circuits |
|
Use Scenario: Aggregating and conditionally inverting outputs from multiple 5V analog sensor comparators in battery-powered monitoring nodes. IC Role / Device Role / Timing Role: XOR logic implementing configurable enable/invert functions based on system mode settings. Use Value: Operates down to 2.0V supply with only 10µA ICC quiescent current, extending runtime in energy-constrained deployments. |
Use Scenario: Providing glue logic between FPGA I/O banks and external peripherals requiring precise XOR-based handshake signaling. IC Role / Device Role / Timing Role: Deterministic, low-skew XOR function synchronizing status flags and control acknowledgments. Use Value: 1.0ns max output-to-output skew guarantees setup/hold timing compliance across multi-bit control buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad XOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC86APWR | Lower VCC min (1.65V), higher IOL (32mA), but only 3.6V max input tolerance | Not suitable for direct 5V input interfacing without external clamping | Select when full 5V input tolerance is not required and higher drive strength is prioritized |
| 74AHC86PW | Wider VCC range (2.0–5.5V), slower tPD (8.5ns), no 5V-tolerant input guarantee | Requires careful input voltage limiting if interfacing with 5V sources | Select when system operates at 5V and 5V-tolerance is unnecessary |
Compared with SN74LVC86APWR and 74AHC86PW, the 74LCX86TTR uniquely delivers guaranteed 5V input tolerance at 3.3V supply with sub-7ns speed and PCI-compliant drive - making it the only choice for robust 3.3V/5V boundary logic without redesign.
Availability
74LCX86TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, PCI bus parity generation, and low-power sensor interface hubs requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for 74LCX86TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with strong emphasis on reliability and eco-design.
The 74LCX series was engineered specifically for low-voltage, high-speed 3.3V logic interoperability with legacy 5V systems - targeting cost-sensitive, space-constrained industrial and communications equipment.
FAQ
Can 74LCX86TTR operate safely with VCC = 2.3V and 5V inputs?
Yes. The device is fully specified for VCC = 2.0V to 3.6V and guarantees 5V-tolerant inputs across that entire range. At VCC = 2.3V, DC input thresholds remain VIH ≥ 2.0V and VIL ≤ 0.8V, and output drive meets ±12mA minimum per ST's recommended operating conditions table.
Does 74LCX86TTR require external pull-up or pull-down resistors on unused inputs?
No. Unused inputs may be tied directly to VCC or GND. The device features internal power-down protection and negligible input leakage (±5µA), eliminating floating input risks without added passives - confirmed by ST's "Pin description" and "DC specifications" sections.
Is the TSSOP14 package of 74LCX86TTR compatible with reflow soldering per JEDEC J-STD-020?
Yes. ST specifies the TSSOP14 package for lead-free reflow per JEDEC J-STD-020D, with peak temperature up to 260°C for 30 seconds. The ECOPACK® marking and mechanical data confirm compliance, and the inner box label includes soldering profile guidance.
What is the maximum capacitive load the 74LCX86TTR can drive while maintaining 6.5ns tPD?
The 6.5ns max tPD is characterized at CL = 50pF, RL = 500Ω per ST's "Dynamic switching characteristics" table. Driving >50pF increases propagation delay nonlinearly; for 100pF loads, typical tPD exceeds 9ns - use local buffering or reduce trace capacitance for timing-critical paths.
74LCX86TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LCX
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- XOR (Exclusive OR)
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 2V ~ 3.6V
- Current - Quiescent (Max):
- 10 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 6.5ns @ 3.3V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74LCX86TTR FAQ
1.How can I place an order for 74LCX86TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX86TTR 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 74LCX86TTR reliable?
The price and inventory of 74LCX86TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX86TTR is usually 5 days.
3.What payment methods are accepted for 74LCX86TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX86TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX86TTR?
74LCX86TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX86TTR 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 74LCX86TTR?
For technical support, including 74LCX86TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX86TTR requirements.
6.How does Aetrix verify that 74LCX86TTR is sourced from the original manufacturer or authorized distributors?
All 74LCX86TTR 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 74LCX86TTR meets industry standards.
7.What is the process for return or replacement of 74LCX86TTR?
All 74LCX86TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX86TTR, 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 74LCX86TTR part is unused and in its original packaging.
Return procedure for 74LCX86TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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