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NXP Semiconductors 74LVT640DB,112
- Part No.:
- 74LVT640DB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LVT640DB,112.pdf
- Description:
- IC TXRX INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:924
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Product details
Overview
74LVT640DB,112 from Nexperia is an 8-bit inverting octal transceiver with 3-state outputs, direction control (DIR), and active-low output enable (OE), operating at 3.3 V nominal supply. It provides bidirectional data flow between two 8-bit buses (A- and B-side), supports 5 V-tolerant inputs, delivers ±64 mA output drive, and features bus-hold inputs eliminating external pull-ups. It is used in 3.3 V/5 V mixed-voltage system interconnects such as backplane interfaces and memory expansion modules.
For engineers reviewing the 74LVT640DB,112 datasheet, 74LVT640DB,112 pinout, 74LVT640DB,112 application, or 74LVT640DB,112 equivalent, key selection criteria include its 3.3 V operation with 5 V input tolerance, inverting logic behavior, 3-state timing (tPZH/tPLZ < 5.3 ns), bus-hold functionality, and SO20 (SOT163-1) package compatibility with legacy 74-series footprints.
Technical Context
The 74LVT640DB,112 implements a BiCMOS-based inverting transceiver architecture with separate DIR and OE controls. Its direction logic routes A-side inputs to B-side outputs (or vice versa) only when OE is LOW, and inverts each bit during transfer. The IOFF circuit enables partial power-down operation by disabling I/O leakage when VCC = 0 V.
It supports live insertion/extraction due to power-up 3-state behavior and overvoltage-tolerant inputs up to 5.5 V. Bus-hold circuitry maintains stable logic states on unused A/B pins without external resistors, with IBHL/IBHH currents of ±75–150 μA at 3.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 3.6 V - ensures compatibility with 3.3 V systems while tolerating rail variation |
| Input Voltage Range | 0 V to 5.5 V - allows direct interfacing with 5 V TTL logic without level shifters |
| Output Drive | +64 mA / –32 mA - supports high-fanout loads and robust noise margin in noisy environments |
| Propagation Delay | tPLH/tPHL ≤ 3.7 ns @ 3.3 V - enables reliable operation in >100 MHz bus systems |
| Bus-Hold Current | ±75 μA min @ 3.0 V - actively retains logic state on floating inputs, eliminating pull-up resistors |
| IOFF Leakage | ±100 μA max @ VCC = 0 V - prevents back-driving during hot-swap or power sequencing |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded and communications equipment |
Pinout & Package
74LVT640DB,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), and pin 20 is VCC. All data pins are bidirectional with bus-hold capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | LOW enables A→B data flow; HIGH enables B→A flow - determines signal path polarity |
| OE (Pin 19) | Output enable (active LOW) | Drives all outputs to high-impedance when HIGH - essential for bus arbitration |
| A0–A7 (Pins 2–9) | Data I/O (A-side) | Inverting bidirectional ports with bus-hold - retain state when unconnected |
| B0–B7 (Pins 11–18) | Data I/O (B-side) | Inverting bidirectional ports with bus-hold - mirror A-side behavior with polarity inversion |
| VCC (Pin 20) | Supply voltage | 3.3 V nominal rail; powers internal BiCMOS circuitry and output drivers |
| GND (Pin 10) | Ground reference | 0 V return path for all logic and drive currents - critical for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 3-state output control | Independent OE pin enables deterministic bus release with tPZH/tPLZ < 5.3 ns - avoids bus contention during switching |
| 5 V-tolerant inputs | Accepts VI up to 5.5 V while powered from 3.3 V - eliminates level translators in mixed-voltage designs |
| Bus-hold inputs | Self-biasing circuitry holds unused A/B pins at valid logic levels - reduces BOM count and PCB area |
| Power-up 3-state | Outputs remain in high-impedance until VCC stabilizes - prevents glitches during power sequencing |
| Live insertion support | IOFF and overvoltage protection allow safe hot-plug into live backplanes - required for modular telecom systems |
Applications
| Backplane Interconnect | Memory Expansion Interface |
|---|---|
Use Scenario: Bidirectional data routing between CPU and peripheral slots in modular rack-mounted systems. IC Role / Device Role / Timing Role: Inverting transceiver managing A/B bus direction under control of system DIR and OE signals. Use Value: Enables 3.3 V CPU to communicate with 5 V legacy peripherals via tolerant inputs and bus-hold stability. | Use Scenario: Extending data/address bus width between SoC and additional SRAM or Flash modules. IC Role / Device Role / Timing Role: Octal bidirectional buffer isolating memory subsystems with precise 3-state timing control. Use Value: Delivers 64 mA drive to overcome capacitive loading across long traces, maintaining signal integrity at >80 MHz. |
| Industrial PLC I/O Module | Test Equipment Bus Adapter |
Use Scenario: Level-shifting and direction-controlled data exchange between 3.3 V controller and 5 V field I/O cards. IC Role / Device Role / Timing Role: Directional interface IC translating between isolated digital I/O banks and main processor bus. Use Value: IOFF protection prevents back-current during module power cycling, supporting hot-swap maintenance. | Use Scenario: Adapting DUT signals between 3.3 V test controller and 5 V legacy instrumentation interfaces. IC Role / Device Role / Timing Role: Inverting transceiver providing controlled signal direction and impedance matching for automated test vectors. Use Value: Sub-4 ns propagation delay ensures setup/hold compliance for high-speed boundary-scan patterns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC640ADTR | Non-inverting logic; 1.65–3.6 V supply; lower drive (±24 mA); no bus-hold | Requires external pull-ups; unsuitable where signal inversion is required in data path | Select only if non-inverting behavior and reduced drive meet system timing and fanout needs |
| SN74LVC8T245RHLR | Non-inverting; dual-supply (VCCA/VCCB); 1.65–3.6 V; ±32 mA drive; no bus-hold | Supports asymmetric voltage translation (e.g., 1.8 V ↔ 3.3 V); lacks 5 V tolerance and bus-hold | Prefer for multi-rail translation; avoid where 5 V input tolerance or floating-pin retention is mandatory |
Compared with 74LVT640DB,112, both alternatives lack inverting logic and bus-hold, requiring external components for unused pin management and altering signal polarity - making them unsuitable drop-ins for existing LVT640 designs relying on those features.
Availability
74LVT640DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, telecom backplane interconnects, and memory expansion interfaces requiring stable component supply, long-term lifecycle assurance, and SO20 footprint compatibility.
Supply support for 74LVT640DB,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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, serving automotive, industrial, and consumer markets with JEDEC-compliant products.
The 74LVT640 belongs to Nexperia's advanced LVT (Low-Voltage TTL) logic family, designed specifically for high-speed, mixed-voltage board-level interconnects where 3.3 V operation, 5 V tolerance, and robust bus driving are essential.
FAQ
Is 74LVT640DB,112 pin-compatible with standard SO20 74-series transceivers?
Yes - it uses the SOT163-1 (SO20) package with identical 1.27 mm pitch and 7.5 mm body width as legacy 74-series devices. Pin 1 (DIR), pins 2–9 (A0–A7), pin 10 (GND), pins 11–18 (B0–B7), pin 19 (OE), and pin 20 (VCC) match industry-standard octal transceiver layouts, enabling drop-in replacement in existing SO20 footprints.
Does 74LVT640DB,112 require external pull-up resistors on unused inputs?
No - it integrates bus-hold circuitry on all A- and B-side data pins, providing ±75 μA holding current at 3.0 V to maintain valid logic states on floating inputs. This eliminates the need for external pull-up or pull-down resistors, reducing BOM cost and PCB space while improving reliability in high-noise environments.
What is the maximum clock/data rate supported by 74LVT640DB,112?
While not a clocked device, its propagation delays (tPLH/tPHL ≤ 3.7 ns at 3.3 V) support reliable operation in bus systems with data rates up to ~100 MHz, assuming proper trace termination and load capacitance ≤ 50 pF. System-level timing must account for inverting behavior and 3-state transition times (tPZH/tPLZ ≤ 5.3 ns).
Can 74LVT640DB,112 be used in hot-swap applications?
Yes - it supports live insertion/extraction per datasheet specification, enabled by IOFF circuitry (which blocks current when VCC = 0 V) and overvoltage-tolerant inputs (up to 5.5 V). These features prevent damage and bus contention during hot-plug events in modular backplane or carrier-card systems.
74LVT640DB,112 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,112 FAQ
1.How can I place an order for 74LVT640DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT640DB,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 74LVT640DB,112 reliable?
The price and inventory of 74LVT640DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT640DB,112 is usually 5 days.
3.What payment methods are accepted for 74LVT640DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT640DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT640DB,112?
74LVT640DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT640DB,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 74LVT640DB,112?
For technical support, including 74LVT640DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT640DB,112 requirements.
6.How does Aetrix verify that 74LVT640DB,112 is sourced from the original manufacturer or authorized distributors?
All 74LVT640DB,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 74LVT640DB,112 meets industry standards.
7.What is the process for return or replacement of 74LVT640DB,112?
All 74LVT640DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT640DB,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 74LVT640DB,112 part is unused and in its original packaging.
Return procedure for 74LVT640DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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