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NXP Semiconductors 74LVT640PW,118
- Part No.:
- 74LVT640PW,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVT640PW,118.pdf
- Description:
- IC TXRX INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:191,900
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Product details
Overview
74LVT640PW,118 from Nexperia is an octal inverting 3-state transceiver with direction control (DIR) and output enable (OE), designed for bidirectional 3.3 V bus interfacing between TTL- and 5 V-tolerant systems. It features bus-hold inputs (eliminating external pull-ups), ±32 mA/±64 mA drive capability, and operates from -40 °C to +85 °C.
For engineers reviewing the 74LVT640PW,118 datasheet, 74LVT640PW,118 pinout, 74LVT640PW,118 application, or 74LVT640PW,118 equivalent, this device is selected for high-speed 8-bit data routing in mixed-voltage backplanes, memory expansion interfaces, and legacy bus bridging where input clamping to 5.5 V and power-down leakage <100 μA are critical.
Technical Context
The 74LVT640PW implements BiCMOS logic to achieve sub-4 ns propagation delay (tPLH/tPHL = 2.3/2.4 ns typical at VCC = 3.3 V) while maintaining 5 V-tolerant inputs and 3.3 V-compatible outputs. Its DIR-controlled bidirectional path supports both A→B and B→A data flow under a single active-low OE signal.
IOFF circuitry ensures near-zero power-down current (<100 μA) when VCC = 0 V, and bus-hold inputs (IBHL = 75–150 μA at VI = 0.8 V) actively retain logic state on unused pins without external biasing-critical for hot-pluggable modules and partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 3.6 V - Enables stable operation across industrial 3.3 V rail tolerances |
| Input Voltage Range | 0 V to 5.5 V - Direct interface with 5 V logic without level shifters |
| Output Drive | +64 mA / -32 mA - Sinks 64 mA in LOW state; sources 32 mA in HIGH state for robust bus loading |
| Propagation Delay | 2.3 ns (LOW→HIGH), 2.4 ns (HIGH→LOW) - Supports >200 MHz bus toggle rates |
| Bus-Hold Current | 75–150 μA (LOW), -75–-150 μA (HIGH) - Maintains valid logic state on floating inputs |
| IOFF Leakage | ±100 μA at VCC = 0 V - Prevents backfeeding and enables true partial power-down |
| Operating Temp | -40 °C to +85 °C - Qualified for industrial ambient environments |
Pinout & Package
TSSOP20 package (SOT360-1), 20-pin plastic thin shrink small outline, 4.4 mm body width, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | Determines data flow: DIR = L → A→B; DIR = H → B→A |
| 2–9 (A0–A7) | Data port A I/O | Octal bidirectional bus side A; bus-hold enabled |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and I/O |
| 11–18 (B7–B0) | Data port B I/O | Octal bidirectional bus side B; mirrored pin order (B7=pin11, B0=pin18) |
| 19 (OE) | Output enable (active LOW) | OE = H → all outputs in high-impedance OFF-state |
| 20 (VCC) | Supply voltage | 3.3 V nominal supply; accepts 2.7–3.6 V range |
Key Features
| Feature | Design Value |
|---|---|
| 5.5 V-tolerant inputs | Accepts 0–5.5 V signals while powered from 3.3 V, enabling direct 5 V system interfacing |
| BiCMOS output stage | Combines bipolar speed and CMOS low static power for <4 ns delay with 64 mA sink capability |
| Power-up 3-state | Outputs remain in high-impedance until VCC stabilizes, preventing bus contention at power-on |
| Live insertion/extraction support | IOFF and bus-hold ensure safe hot-swap in backplane and modular systems |
| Latch-up immunity | Exceeds 500 mA per JESD78 Class II Level B - robust against transient-induced latch-up |
Applications
| Industrial Backplane Interface | Memory Expansion Module |
|---|---|
Use Scenario: Bidirectional data transfer between 3.3 V controller and legacy 5 V peripheral cards in programmable logic controllers. IC Role / Device Role / Timing Role: Octal transceiver managing A/B bus direction under DIR control; OE synchronizes with bus arbitration cycles. Use Value: Eliminates need for discrete level shifters and pull-up resistors, reducing BOM count and PCB area by >30%. | Use Scenario: Adding external SRAM or Flash to a 3.3 V microcontroller with 5 V-tolerant address/data lines. IC Role / Device Role / Timing Role: Inverting transceiver buffering and isolating memory bus; bus-hold retains valid address during chip select deassertion. Use Value: Ensures deterministic bus state during memory access gaps, preventing spurious reads/writes. |
| Hot-Swappable I/O Module | Legacy Bus Bridge |
Use Scenario: Field-replaceable digital I/O card in industrial automation rack with live insertion capability. IC Role / Device Role / Timing Role: Isolates module's internal 3.3 V logic from backplane 5 V bus; IOFF prevents backfeeding during insertion. Use Value: Enables zero-downtime maintenance without powering down entire system. | Use Scenario: Interfacing modern FPGA-based subsystems (3.3 V) with older ISA or VME bus peripherals (5 V). IC Role / Device Role / Timing Role: Direction-controlled bidirectional bridge translating timing-critical control/data signals. Use Value: Meets tPLH/tPHL ≤ 3.7 ns requirement for ISA bus timing compliance at 8 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Non-inverting; 3.3 V only I/O (no 5 V tolerance); lower drive (±24 mA) | Suitable for pure 3.3 V systems; not viable for 5 V bus interfacing | Select only if system uses uniform 3.3 V signaling and lower drive suffices. |
| 74ALVC164245T | 16-bit (dual-octal); non-inverting; 5 V tolerant; higher ICC (0.4 mA typ) | Used in wider data paths; lacks bus-hold, requiring external pull-ups | Choose when doubling channel count is needed and board space allows extra passives. |
Compared with SN74LVC245APWR and 74ALVC164245T, the 74LVT640PW,118 uniquely delivers inverting logic, 5.5 V input tolerance, bus-hold, and asymmetric drive (+64 mA/−32 mA) in a compact TSSOP20-making it irreplaceable for legacy 5 V bus bridging with minimal external components.
Availability
74LVT640PW,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion modules, hot-swappable I/O modules, and legacy bus bridges requiring stable component supply across extended temperature ranges.
Supply support for 74LVT640PW,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74LVT series targets high-speed, mixed-voltage bus interfacing-designed specifically for bridging legacy 5 V systems with modern 3.3 V logic while minimizing external components and power consumption.
FAQ
What is the function of the DIR pin on the 74LVT640PW,118?
The DIR (direction) pin controls data flow direction: when DIR is LOW, data passes from port A to port B; when DIR is HIGH, data flows from port B to port A. This single-pin control eliminates the need for separate transmit/receive enable logic, simplifying bus arbitration in bidirectional systems.
Does the 74LVT640PW,118 require external pull-up resistors on unused inputs?
No. The device integrates bus-hold circuitry on all A and B port inputs, providing active current-driven retention (IBHL = 75–150 μA at VI = 0.8 V) that maintains valid logic states without external pull-ups-reducing component count and improving reliability in high-density layouts.
Can the 74LVT640PW,118 be used in hot-swap applications?
Yes. Its IOFF circuitry ensures leakage <±100 μA when VCC = 0 V, and bus-hold inputs prevent floating states during insertion/removal. Combined with power-up 3-state behavior, these features meet industrial hot-swap requirements without additional protection circuitry.
What is the maximum clock/data rate supported by the 74LVT640PW,118?
With typical propagation delays of 2.3 ns (tPLH) and 2.4 ns (tPHL) at VCC = 3.3 V, the device supports clean signal edges up to ~200 MHz toggle rate. System-level timing must account for board trace delays and load capacitance, but the IC itself meets ISA bus and similar legacy parallel interface timing budgets.
74LVT640PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
74LVT640PW,118 FAQ
1.How can I place an order for 74LVT640PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT640PW,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 74LVT640PW,118 reliable?
The price and inventory of 74LVT640PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT640PW,118 is usually 5 days.
3.What payment methods are accepted for 74LVT640PW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT640PW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT640PW,118?
74LVT640PW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT640PW,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 74LVT640PW,118?
For technical support, including 74LVT640PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT640PW,118 requirements.
6.How does Aetrix verify that 74LVT640PW,118 is sourced from the original manufacturer or authorized distributors?
All 74LVT640PW,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 74LVT640PW,118 meets industry standards.
7.What is the process for return or replacement of 74LVT640PW,118?
All 74LVT640PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT640PW,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 74LVT640PW,118 part is unused and in its original packaging.
Return procedure for 74LVT640PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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