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NXP Semiconductors 74LVT244ADB,118
- Part No.:
- 74LVT244ADB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LVT244ADB,118.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,327
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Product details
Overview
74LVT244ADB,118 from Nexperia is a 3.3 V octal buffer/line driver with dual 3-state outputs, designed for high-speed bus interface in industrial and embedded digital systems. It features two independent output enables (1OE, 2OE), ±32 mA/±64 mA drive capability, overvoltage-tolerant inputs up to 5.5 V, and bus-hold circuitry eliminating external pull-ups. Used in backplane data routing and level-translating I/O expansion.
For engineers reviewing the 74LVT244ADB,118 datasheet, 74LVT244ADB,118 pinout, 74LVT244ADB,118 application, or 74LVT244ADB,118 equivalent, key selection criteria include 3-state timing (tPZH ≤ 5.2 ns), 2.7–3.6 V supply operation, 5.5 V input tolerance, and SO20 package compatibility with legacy 74-series footprints.
Technical Context
This BiCMOS octal buffer implements two independent 4-bit 3-state groups, each controlled by dedicated active-low OE pins (1OE on pin 1, 2OE on pin 19). Its bus-hold inputs maintain logic state without external biasing, supporting live insertion and partial power-down via IOFF circuitry.
The device operates across –40 °C to +85 °C with propagation delays as low as 2.5 ns (tPLH/tPHL at VCC = 3.3 V) and 3-state enable/disable times under 5.6 ns (tPHZ/tPLZ). Input clamping protects against overvoltage transients, while latch-up immunity exceeds 500 mA per JESD78 Class II Level B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 3.6 V - Enables direct interface with 3.3 V logic domains and compatibility with mixed-voltage system rails. |
| Input Voltage Tolerance | Up to 5.5 V - Allows safe connection to 5 V buses without level-shifting components. |
| Output Drive | +64 mA sink / –32 mA source - Sustains robust signal integrity driving multiple TTL loads or capacitive traces. |
| Propagation Delay | 2.5 ns typical (VCC = 3.3 V) - Supports >200 MHz bus operation with tight timing margins. |
| 3-State Enable Time | 3.3 ns typical (tPHZ) - Minimizes bus contention during dynamic output control. |
| Bus Hold Current | ±75 μA to ±150 μA - Actively retains unused input states, removing need for 10 kΩ pull-up/down resistors. |
| Operating Temperature | –40 °C to +85 °C - Qualified for industrial-grade deployment in uncontrolled thermal environments. |
Pinout & Package
74LVT244ADB,118 is packaged in SO20 (SOT163-1), a 20-pin plastic small outline package with 7.5 mm body width and 1.27 mm lead pitch. Pin 1 is marked by a bevelled corner or notch; pin 10 is GND and pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls four outputs each; asserts high-impedance state when HIGH. |
| 2, 4, 6, 8 | 1A0–1A3 | Group 1 data inputs feeding outputs 1Y0–1Y3 (pins 18, 16, 14, 12). |
| 11, 13, 15, 17 | 2A0–2A3 | Group 2 data inputs feeding outputs 2Y0–2Y3 (pins 9, 7, 5, 3). |
| 12, 14, 16, 18 | 1Y0–1Y3 | 3-state outputs for first 4-bit channel; driven by 1A0–1A3 when 1OE = LOW. |
| 3, 5, 7, 9 | 2Y0–2Y3 | 3-state outputs for second 4-bit channel; driven by 2A0–2A3 when 2OE = LOW. |
| 10 | GND | Ground reference for all internal circuitry and I/O; must be connected to system 0 V plane. |
| 20 | VCC | Primary supply rail; decoupling capacitor (100 nF) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit 3-state control | Enables flexible partitioning - e.g., one group for address bus, another for data bus - reducing external gating logic. |
| Overvoltage-tolerant inputs (5.5 V) | Eliminates level shifters when interfacing with 5 V peripherals or legacy controllers, lowering BOM count and layout complexity. |
| Bus-hold inputs | Maintains valid logic levels on floating inputs without external resistors, improving noise immunity and simplifying PCB routing. |
| IOFF partial power-down | Prevents current flow through powered-off outputs when VCC = 0 V, enabling hot-swap capability in modular backplanes. |
| Latch-up immunity >500 mA | Ensures robustness against transient faults in noisy industrial environments without requiring external current-limiting protection. |
Applications
| Industrial Backplane Interface | Embedded I/O Expansion |
|---|---|
|
Use Scenario: Isolating and buffering parallel address/data lines between CPU module and peripheral cards in modular PLC chassis. IC Role / Device Role / Timing Role: Octal 3-state buffer providing direction-controlled bidirectional bus isolation with sub-5 ns propagation delay. Use Value: Prevents bus contention during card hot-swap and supports simultaneous read/write cycles across multiple slots using shared 3.3 V backplane. |
Use Scenario: Extending GPIO count on an ARM Cortex-M4 microcontroller for sensor array control and status monitoring. IC Role / Device Role / Timing Role: Level-translating line driver translating 3.3 V MCU outputs to 5 V-compatible logic thresholds while sourcing 64 mA per output. Use Value: Drives high-capacitance cables and optocoupler inputs directly, avoiding discrete transistor buffers and reducing board area by 30%. |
| Legacy System Upgrade | Test Equipment Signal Conditioning |
|
Use Scenario: Replacing obsolete 74ACT244 in aging test fixture controller to extend service life without redesigning PCB layout. IC Role / Device Role / Timing Role: Pin-compatible octal buffer with identical SO20 footprint and enhanced 5.5 V input tolerance for legacy 5 V signal injection. Use Value: Maintains full backward compatibility while adding bus-hold and improved ESD robustness (HBM >2000 V), reducing field failure rates. |
Use Scenario: Driving multiple DUT (device-under-test) inputs simultaneously from a single FPGA I/O bank in automated test equipment. IC Role / Device Role / Timing Role: High-drive 3-state buffer enabling synchronized enable/disable of stimulus signals across 8 channels with <5.2 ns skew. Use Value: Guarantees precise edge alignment across all outputs, critical for setup/hold timing validation of high-speed digital ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVT244APW,118 | TSSOP20 package (4.4 mm width); 0.65 mm pitch; lower profile (1.1 mm max height). | Better suited for space-constrained portable instrumentation; requires finer-pitch reflow profile. | Select when board real estate is limited and thermal dissipation is managed via PCB copper pour. |
| SN74LVC244APWR | TI part; 1.65–3.6 V supply; lower drive (±24 mA); no bus-hold; different pinout (1OE on pin 1, but 2OE on pin 18). | Requires external pull-ups on unused inputs; not drop-in compatible due to pin mapping mismatch. | Choose only if cost sensitivity outweighs design reuse and bus-hold functionality is unnecessary. |
Compared with 74LVT244ADB,118, the TSSOP variant offers miniaturization at the cost of solder joint reliability in high-vibration environments, while the TI LVC version sacrifices drive strength and bus-hold for broader voltage flexibility - neither matches the original's balance of industrial ruggedness, pinout consistency, and ease of legacy replacement.
Availability
74LVT244ADB,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded I/O expansion, legacy system upgrades, and test equipment signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for 74LVT244ADB,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 specializing in high-performance, reliable standard logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74LVT series delivers high-speed BiCMOS logic optimized for 3.3 V systems with robust noise immunity and bus-hold functionality - engineered specifically for industrial control, communications infrastructure, and test equipment where signal integrity and long-term supply stability are critical.
FAQ
What is the maximum input voltage the 74LVT244ADB,118 can tolerate?
The device accepts input voltages up to +5.5 V regardless of VCC level, verified per datasheet Table 4 (VI input voltage). This overvoltage tolerance allows direct interfacing with 5 V logic without external level shifters or clamping diodes, provided input clamp current remains below 50 mA.
Does the 74LVT244ADB,118 require external pull-up resistors on unused inputs?
No. The device integrates bus-hold circuitry on all data inputs (1A0–1A3, 2A0–2A3), actively maintaining the last valid logic state with ±75 μA to ±150 μA hold current. This eliminates the need for external 10 kΩ pull-up or pull-down resistors, reducing component count and board space.
Can the 74LVT244ADB,118 be used in hot-swap applications?
Yes. Its IOFF circuitry ensures negligible power-off leakage (<±100 μA) when VCC = 0 V, and live insertion/extraction is explicitly supported per datasheet Section 2. Combined with bus-hold and robust ESD protection (HBM >2000 V), it meets requirements for modular backplane systems requiring field-replaceable modules.
What is the recommended decoupling for the VCC pin?
A 100 nF ceramic capacitor placed within 5 mm of pin 20 (VCC) and connected to pin 10 (GND) is mandatory per datasheet layout guidance. For systems with high-frequency switching or heavy load transients, add a 4.7 μF tantalum or aluminum polymer capacitor in parallel to suppress low-frequency ripple and improve transient response.
74LVT244ADB,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:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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
74LVT244ADB,118 FAQ
1.How can I place an order for 74LVT244ADB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT244ADB,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 74LVT244ADB,118 reliable?
The price and inventory of 74LVT244ADB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT244ADB,118 is usually 5 days.
3.What payment methods are accepted for 74LVT244ADB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT244ADB,118 transactions.
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4.How is shipping managed for 74LVT244ADB,118?
74LVT244ADB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT244ADB,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 74LVT244ADB,118?
For technical support, including 74LVT244ADB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT244ADB,118 requirements.
6.How does Aetrix verify that 74LVT244ADB,118 is sourced from the original manufacturer or authorized distributors?
All 74LVT244ADB,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 74LVT244ADB,118 meets industry standards.
7.What is the process for return or replacement of 74LVT244ADB,118?
All 74LVT244ADB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT244ADB,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 74LVT244ADB,118 part is unused and in its original packaging.
Return procedure for 74LVT244ADB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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