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NXP Semiconductors 74LVT640DB,118
- Part No.:
- 74LVT640DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LVT640DB,118.pdf
- Description:
- IC TXRX INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
74LVT640DB,118 from Nexperia is an octal inverting 3-state transceiver with direction control and bus-hold inputs, operating from 2.7 V to 3.6 V supply. It provides bidirectional data flow between two 8-bit buses (A0–A7 ↔ B0–B7), features ±64 mA output drive, 5.5 V-tolerant inputs, and supports live insertion/extraction in industrial backplane and memory interface applications.
For engineers reviewing the 74LVT640DB,118 datasheet, 74LVT640DB,118 pinout, 74LVT640DB,118 application, or 74LVT640DB,118 equivalent, this device is selected for high-speed 3.3 V bus interfacing where level translation, bus contention avoidance, and input state retention without external pull-ups are required.
Technical Context
The 74LVT640DB,118 implements a BiCMOS-based octal transceiver architecture with independent DIR (pin 1) and active-low OE (pin 19) controls. Its inverting logic path ensures signal polarity inversion across all eight channels during bidirectional transfer.
It integrates IOFF circuitry enabling partial power-down operation and bus-hold inputs (IBHL/IBHH ≥ ±75 μA at 3.0 V) that maintain valid logic states on unused A/B pins-eliminating external pull-up resistors while ensuring noise immunity in floating-bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.7 V to 3.6 V - Enables direct compatibility with 3.3 V systems and tolerance to rail variation in noisy industrial supplies. |
| Input voltage tolerance | Up to 5.5 V - Allows safe interfacing with 5 V legacy buses without level-shifting components. |
| Output drive (IOL/IOH) | +64 mA / −32 mA - Supports driving heavy capacitive loads (e.g., long PCB traces or multiple CMOS inputs) while maintaining fast edge rates. |
| Propagation delay (tPLH/tPHL) | 1.0 ns to 3.7 ns at VCC = 3.3 V - Ensures sub-4 ns channel latency for high-throughput data transfers in memory buffers and FPGA I/O expansion. |
| Bus-hold current | ±75 μA to ±150 μA at 3.0 V - Actively retains input logic state during bus idle periods, preventing metastability in unconnected or unterminated lines. |
| Operating temperature | −40 °C to +85 °C - Qualified for industrial-grade embedded control, telecom line cards, and automated test equipment. |
| ESD protection | ≥2000 V HBM, ≥200 V MM - Provides robust handling during board assembly and field maintenance without additional protection circuitry. |
Pinout & Package
74LVT640DB,118 is packaged in SOT360-1 (TSSOP20), a 20-pin thin shrink small outline package with 4.4 mm body width, 0.65 mm lead pitch, and exposed pad-compatible footprint for thermal management in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW enables data flow A→B; HIGH enables B→A - determines real-time bus ownership in shared-memory architectures. |
| 2–9 (A0–A7) | Bidirectional data port A | Octal I/O with bus-hold - maintains last-valid state when disconnected, reducing system-level pull-up count and BOM cost. |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and output drivers - requires low-inductance connection to minimize ground bounce in high-speed switching. |
| 11–18 (B7–B0) | Bidirectional data port B | Complementary octal I/O bank - physically staggered (B7=pin11, B0=pin18) to support interleaved routing and reduce crosstalk in parallel bus layouts. |
| 19 (OE) | Active-low output enable | Drives all outputs to high-impedance when HIGH - essential for multi-master arbitration and hot-swap isolation in modular backplanes. |
| 20 (VCC) | Power supply | 3.3 V nominal supply with 2.7–3.6 V range - decoupling capacitor (100 nF) required within 5 mm for stable transient response during 64 mA output transitions. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Combines bipolar speed and CMOS density to achieve <4 ns propagation delay with 64 mA sink capability - critical for DDR memory buffer timing budgets. |
| IOFF partial power-down | Enables safe power sequencing: outputs enter high-Z when VCC = 0 V, preventing back-driving of powered subsystems during hot-plug events. |
| 5 V-tolerant inputs | Accepts TTL/5 V logic levels while powered from 3.3 V - eliminates need for discrete level translators in mixed-voltage server motherboard designs. |
| Live insertion/extraction support | Guaranteed no latch-up (JESD78 Class II Level B >500 mA) and controlled power-up 3-state behavior - enables field-replaceable module deployment in telecom chassis. |
| No bus current loading at 5 V | Outputs tolerate being tied directly to 5 V buses without sourcing current - simplifies interconnection with legacy peripherals and reduces standby power in always-on systems. |
Applications
| Industrial Backplane Interface | FPGA I/O Expansion |
|---|---|
|
Use Scenario: Interfacing multiple 3.3 V controller modules to a shared 5 V backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between isolated processor slots and centralized I/O fabric. Use Value: 5.5 V input tolerance and bus-hold eliminate external level shifters and pull-ups, reducing slot BOM by two ICs per module. |
Use Scenario: Extending FPGA GPIO count to drive 8-bit peripheral interfaces (e.g., LCD controllers, ADC/DAC buses) with precise timing control. IC Role / Device Role / Timing Role: Direction-controlled data bridge synchronizing burst-mode transfers between FPGA fabric and external devices. Use Value: Sub-4 ns propagation delay meets tight setup/hold windows for 100+ MHz peripheral clocks without added timing margin. |
| Memory Buffer Module | Hot-Swappable Test Equipment |
|
Use Scenario: Isolating and buffering address/data lines between microcontroller and SRAM/Flash in ruggedized data loggers. IC Role / Device Role / Timing Role: Inverting transceiver providing galvanic separation and drive strength boost for long trace runs. Use Value: ±64 mA output drive sustains signal integrity over 15 cm FR4 traces at 50 MHz, avoiding signal degradation-induced read errors. |
Use Scenario: Enabling field replacement of measurement modules in automated test systems without powering down the main chassis. IC Role / Device Role / Timing Role: Bus isolation device asserting high-impedance state during module insertion/removal to prevent bus contention. Use Value: Power-up 3-state and IOFF behavior ensure zero glitch transmission during hot-swap, protecting connected DUTs from data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC8T245RHLR | Non-inverting logic, 1.65–5.5 V supply, lower drive (±24 mA), no bus-hold | Requires external pull-ups for unused inputs; suited for general-purpose level translation, not bus-retention-critical systems | Select when polarity preservation and wide-VCC flexibility outweigh need for bus-hold and high drive. |
| 74ALVT16245DGG | 16-bit, non-inverting, 2.3–3.6 V, ±32 mA drive, includes bus-hold | Doubles channel count but lacks 5 V tolerance; better for compact 16-bit data paths with strict 3.3 V rails | Choose for higher-density bidirectional interfaces where space constraints favor 16-bit integration over dual octal devices. |
Compared with SN74LVC8T245RHLR and 74ALVT16245DGG, the 74LVT640DB,118 uniquely combines inverting logic, 5.5 V input tolerance, ±64 mA drive, and integrated bus-hold - making it optimal for industrial backplanes requiring robust state retention and legacy voltage interoperability.
Availability
74LVT640DB,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, memory buffer modules, and hot-swappable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVT640DB,118 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
Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in industrial and consumer applications.
The 74LVT640DB,118 belongs to Nexperia's LVT (Low-Voltage Technology) logic family, engineered specifically for high-speed 3.3 V bus interfacing with 5 V tolerance and robust ESD/latch-up immunity in demanding industrial environments.
FAQ
What is the function of the DIR pin on the 74LVT640DB,118?
The DIR (direction) pin is a dedicated control input that determines data flow direction: when DIR is LOW, data passes from port A (pins 2–9) to port B (pins 11–18); when DIR is HIGH, data flows from port B to port A. This single-pin control enables dynamic bus arbitration without requiring separate transmit/receive enable signals, simplifying FPGA or microcontroller GPIO usage in bidirectional protocols.
Does the 74LVT640DB,118 require external pull-up resistors on unused inputs?
No. The device integrates bus-hold circuitry on all A and B port inputs, providing ±75 μA to ±150 μA of active current to retain the last-valid logic state. This eliminates the need for external pull-up or pull-down resistors on unconnected pins, reducing component count, PCB area, and potential signal integrity issues caused by resistor parasitics in high-speed layouts.
Can the 74LVT640DB,118 safely interface with a 5 V microcontroller?
Yes. Its inputs are overvoltage tolerant up to 5.5 V regardless of VCC level (2.7–3.6 V), allowing direct connection to 5 V logic outputs without level-shifting circuitry. However, outputs remain 3.3 V–referenced and must not be driven into a 5 V bus unless the receiving device accepts 3.3 V logic-high thresholds - verified via its VIH specification (≥2.0 V).
What is the significance of the 'DB' suffix in 74LVT640DB,118?
The 'DB' suffix denotes the SOT360-1 (TSSOP20) package variant - a 20-lead thin shrink small outline package with 4.4 mm body width and 0.65 mm lead pitch. The ',118' suffix indicates tape-and-reel packaging per JEDEC standard J-STD-020, optimized for automated SMT placement. This differs from 'D' (SO20/SOT163-1) and 'PW' (TSSOP20 with different moisture sensitivity level).
74LVT640DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74LVT640DB,118 FAQ
1.How can I place an order for 74LVT640DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT640DB,118 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 74LVT640DB,118 reliable?
The price and inventory of 74LVT640DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT640DB,118 is usually 5 days.
3.What payment methods are accepted for 74LVT640DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT640DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT640DB,118?
74LVT640DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT640DB,118 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 74LVT640DB,118?
For technical support, including 74LVT640DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT640DB,118 requirements.
6.How does Aetrix verify that 74LVT640DB,118 is sourced from the original manufacturer or authorized distributors?
All 74LVT640DB,118 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 74LVT640DB,118 meets industry standards.
7.What is the process for return or replacement of 74LVT640DB,118?
All 74LVT640DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT640DB,118, 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 74LVT640DB,118 part is unused and in its original packaging.
Return procedure for 74LVT640DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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