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Nexperia USA Inc. 74LVT640D,112
- Part No.:
- 74LVT640D,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVT640D,112.pdf
- Description:
- IC TRANSCEIVER INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,743
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Product details
Overview
74LVT640D,112 from Nexperia is an 8-bit inverting octal transceiver with 3-state outputs, direction control (DIR), and active-low output enable (OE). It operates from 2.7 V to 3.6 V, supports 5 V-tolerant inputs, delivers ±32 mA/±64 mA drive, and features bus-hold inputs eliminating external pull-ups. It enables bidirectional data flow between 3.3 V logic domains and legacy 5 V buses in memory expansion and backplane interface applications.
For engineers reviewing the 74LVT640D,112 datasheet, 74LVT640D,112 pinout, 74LVT640D,112 application, or 74LVT640D,112 equivalent, key selection criteria include its inverting logic behavior, DIR/OE dual-control architecture, 3.3 V supply compatibility with 5 V I/O tolerance, bus-hold functionality, and SO20 package thermal and routing constraints.
Technical Context
The device implements a dual-bus bidirectional interface using complementary BiCMOS circuitry for high-speed switching and robust output drive. Its functional truth table defines three operational states: DIR = LOW enables B→A data transfer; DIR = HIGH enables A→B transfer; OE = HIGH forces all outputs into high-impedance OFF-state regardless of DIR state.
Bus-hold circuitry actively maintains last-valid logic state on unused A/B pins without external resistors, reducing board space and power overhead. The IOFF partial power-down feature disables output leakage when VCC = 0 V, supporting live insertion/extraction in hot-swap systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 3.6 V - ensures stable operation across industrial-grade 3.3 V rails with ±0.3 V margin |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5 V CMOS/TTL buses without level-shifting |
| Output Drive | +64 mA sink / –32 mA source - supports driving heavy capacitive loads and multiple TTL inputs |
| Propagation Delay | 1.0–3.7 ns (VCC = 3.3 V) - enables sub-250 MHz bus timing in high-speed parallel interfaces |
| Bus-Hold Current | ±75 μA to ±150 μA - reliably sustains logic state on floating inputs without external biasing |
| IOFF Leakage | ±100 μA at VCC = 0 V - prevents back-powering and signal corruption during power sequencing |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial ambient environments without derating |
Pinout & Package
74LVT640D,112 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. Pin 1 is DIR, pin 10 is GND, pin 19 is OE (active LOW), pin 20 is VCC, and data terminals are arranged as A0–A7 (pins 2–9) and B0–B7 (pins 11–18) with mirrored physical layout for PCB routing symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | Determines data flow direction: LOW = B→A, HIGH = A→B; asynchronous control with no internal synchronization |
| OE (Pin 19) | Output enable (active LOW) | When HIGH, forces all A/B outputs into high-impedance state; overrides DIR and isolates both buses |
| A0–A7 (Pins 2–9) | Data I/O port A | Octal inverting bidirectional bus port with bus-hold; connects to local 3.3 V domain |
| B0–B7 (Pins 11–18) | Data I/O port B | Octal inverting bidirectional bus port with bus-hold; connects to external 5 V bus or peripheral |
| VCC (Pin 20) | Power supply | 3.3 V nominal supply; must be decoupled locally with ≤100 nF ceramic capacitor |
| GND (Pin 10) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance PCB plane connection |
Key Features
| Feature | Design Value |
|---|---|
| Inverting transceiver logic | Each A/B pair performs bitwise inversion during data transfer, enabling direct integration with complementary bus architectures |
| 5 V-tolerant inputs | Accepts 0–5.5 V input signals while powered from 3.3 V, eliminating need for external level translators |
| Bus-hold inputs | Actively retains last valid logic state on unconnected A/B pins, preventing floating-node noise and EMI susceptibility |
| IOFF partial power-down | Disables output leakage paths when VCC = 0 V, allowing safe hot-plug operation without damaging downstream circuitry |
| Live insertion/extraction support | Guaranteed functionality during power-up/power-down sequences, meeting JEDEC JESD8C requirements for system maintenance |
Applications
| Memory Expansion Interface | Industrial Backplane Bus |
|---|---|
Use Scenario: Interfacing a 3.3 V microcontroller to legacy 5 V SRAM or Flash memory modules via parallel address/data bus. IC Role / Device Role / Timing Role: Bidirectional inverting transceiver managing data flow direction under CPU control while maintaining signal integrity across voltage domains. Use Value: Eliminates discrete level shifters and pull-up networks, reducing BOM count by ≥4 components per bus segment and lowering layout complexity. | Use Scenario: Connecting modular I/O cards with mixed-voltage peripherals (e.g., 5 V sensors, 3.3 V FPGAs) on a shared backplane. IC Role / Device Role / Timing Role: Voltage-domain bridge providing direction-controlled, high-drive data transfer with bus-hold stabilization during card insertion/removal. Use Value: Enables hot-swap capability without bus contention or glitch propagation, verified by JESD78 Class II latch-up immunity (>500 mA). |
| Legacy Peripheral Adapter | Test Equipment Data Link |
Use Scenario: Adapting modern 3.3 V test controllers to older 5 V GPIB or ISA-bus peripherals requiring bidirectional handshake protocols. IC Role / Device Role / Timing Role: Inverting transceiver synchronized to control signals (DIR/OE) to emulate native bus timing and polarity conventions. Use Value: Maintains sub-4 ns propagation delay margin for 25 MHz bus clocks, ensuring setup/hold compliance without added timing buffers. | Use Scenario: High-reliability data coupling between 3.3 V FPGA-based pattern generators and 5 V DUTs in automated test equipment. IC Role / Device Role / Timing Role: Robust bidirectional interface with ±64 mA drive capability to overcome long-trace capacitance and maintain signal edge rates. Use Value: Delivers 3.3 V logic compatibility with 5 V I/O tolerance and ESD protection exceeding 2000 V HBM, reducing field failure risk in lab environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Non-inverting logic; lower drive (±24 mA); no bus-hold; 1.65–3.6 V supply | Requires external pull-ups for unused pins; unsuitable for hot-swap due to missing IOFF | Select only if non-inverting logic matches system protocol and 5 V tolerance is not required |
| 74ALVC164245DGGR | 16-bit, non-inverting, 3.3 V–5 V dual-supply; higher pin count; no bus-hold | Designed for wide-bus applications; lacks single-supply 5 V tolerance and bus-hold stabilization | Choose for 16-bit parallel paths where direction control and dual-rail operation are mandatory |
Compared with SN74LVC245APWR and 74ALVC164245DGGR, the 74LVT640D,112 uniquely combines inverting logic, 5 V-tolerant inputs, bus-hold, and IOFF in an SO20 package-making it the only option for space-constrained, hot-swap-capable 8-bit inverting bus bridging with zero external bias components.
Availability
74LVT640D,112 is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial backplane buses, legacy peripheral adapters, and test equipment data links requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 74LVT640D,112 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 74LVT640 belongs to Nexperia's LVT (Low-Voltage TTL) logic family, engineered specifically for robust 3.3 V system interfacing with legacy 5 V infrastructure-emphasizing voltage translation, hot-swap safety, and noise-immune bus operation.
FAQ
What is the function of the DIR pin on the 74LVT640D,112?
The DIR (direction) pin controls data flow direction: when DIR = LOW, data transfers from port B to port A; when DIR = HIGH, data flows from port A to port B. This asynchronous control operates independently of OE and determines which port acts as input versus output, enabling flexible bidirectional bus arbitration in real-time systems.
Does the 74LVT640D,112 require external pull-up resistors on unused inputs?
No. The device integrates bus-hold circuitry on all A and B data pins, providing ±75 μA to ±150 μA active current to retain the last-valid logic state. This eliminates the need for external pull-up or pull-down resistors, reducing component count, PCB area, and potential signal integrity issues caused by resistor parasitics.
Can the 74LVT640D,112 safely interface with a 5 V microcontroller's data bus?
Yes. Its inputs tolerate up to 5.5 V regardless of VCC level (2.7–3.6 V), allowing direct connection to 5 V CMOS/TTL outputs without level-shifting circuitry. However, outputs swing between 0 V and VCC (~3.3 V), so receiving 5 V devices must accept 3.3 V logic-high levels-verified compatible with standard 5 V TTL input thresholds (VIH ≥ 2.0 V).
Is the 74LVT640D,112 suitable for hot-swap applications?
Yes. It supports live insertion/extraction per JEDEC JESD8C, featuring IOFF circuitry that disables output leakage when VCC = 0 V and bus-hold to prevent floating inputs during power transitions. These features, combined with latch-up immunity >500 mA, ensure safe operation during board replacement in powered-backplane systems.
74LVT640D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-SO
74LVT640D,112 FAQ
1.How can I place an order for 74LVT640D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT640D,112 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 74LVT640D,112 reliable?
The price and inventory of 74LVT640D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT640D,112 is usually 5 days.
3.What payment methods are accepted for 74LVT640D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT640D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT640D,112?
74LVT640D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT640D,112 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 74LVT640D,112?
For technical support, including 74LVT640D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT640D,112 requirements.
6.How does Aetrix verify that 74LVT640D,112 is sourced from the original manufacturer or authorized distributors?
All 74LVT640D,112 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 74LVT640D,112 meets industry standards.
7.What is the process for return or replacement of 74LVT640D,112?
All 74LVT640D,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT640D,112, 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 74LVT640D,112 part is unused and in its original packaging.
Return procedure for 74LVT640D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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