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Texas Instruments SN74LVC244ADWE4
- Part No.:
- SN74LVC244ADWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC244ADWE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,132
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Product details
Overview
SN74LVC244ADWE4 from Texas Instruments is an octal 3-state buffer/driver IC designed for asynchronous bus interfacing in 1.65V–3.6V systems. It features dual 4-bit banks, 5.9ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion-used in server backplanes and LED display data routing.
For engineers reviewing the SN74LVC244ADWE4 datasheet, SN74LVC244ADWE4 pinout, SN74LVC244ADWE4 application, or SN74LVC244ADWE4 equivalent, this page delivers verified package mapping (SOIC-20 DW), real-world timing specs, mixed-voltage translation capability, and validated alternatives for industrial bus interface design.
Technical Context
The SN74LVC244ADWE4 implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable (OE) input. Its CMOS architecture supports balanced sourcing/sinking (±24mA at 3V), enabling high-speed signal integrity on PCB traces up to 12cm without termination.
It integrates Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive during partial power-down. Input clamping diodes and 5.5V tolerance allow safe interfacing with 5V logic while operating from 3.3V or lower supplies-enabling down-translation in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables operation across LVC-family supply rails including 1.8V, 2.5V, and 3.3V systems |
| Input Voltage Tolerance | Up to 5.5V - Allows direct connection to 5V buses without level-shifting components |
| Max Propagation Delay | 5.9ns at 3.3V - Supports >100MHz bus toggle rates with margin for trace loading |
| Output Drive Strength | ±24mA at VCC = 3V - Drives 50Ω transmission lines or multiple CMOS loads without external buffers |
| Ioff Current | ±20µA at VCC = 0V - Prevents current leakage during hot-swap or partial-power-down sequences |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive, industrial control, and telecom infrastructure environments |
| ESD Rating (HBM) | ±2000V - Meets JEDEC JS-001 for robust handling in automated assembly and field service |
Pinout & Package
SN74LVC244ADWE4 is packaged in a 20-pin SOIC (DW) body measuring 12.80mm × 10.3mm with 7.50mm body width. The package includes exposed thermal pad variants only in QFN formats; the DW variant uses standard gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight independent data inputs grouped into two 4-bit banks; each bank shares one OE control |
| 1Y1–1Y4, 2Y1–2Y4 | 3-State Output | Noninverting buffered outputs; high-impedance when corresponding OE is high |
| 1OE, 2OE | Active-Low Enable | Controls respective 4-bit bank; low = enabled, high = high-Z; pull-up required for power-up safety |
| VCC | Power Supply | Single 1.65–3.6V supply; bypass capacitor (0.1µF) required adjacent to pin 20 |
| GND | Ground Reference | Common return path for all I/O and internal logic; must connect to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5V-tolerant inputs with 3.3V VCC enable direct interfacing between legacy 5V peripherals and modern low-voltage controllers |
| Ioff partial-power-down protection | Prevents current backflow and bus contention when VCC is off-critical for hot-pluggable modules and modular servers |
| Balanced CMOS 3-state outputs | Sinks and sources equal current (±24mA), ensuring symmetrical rise/fall times and minimizing ground bounce (<0.8V typical) |
| Low propagation delay | 5.9ns max at 3.3V enables clean signal edges on long PCB traces up to 12cm without added termination |
| Ultra-low static current | ICC ≤ 40µA over full temperature range reduces standby power in always-on industrial I/O expanders |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
Use Scenario: Isolating and driving address/data lines between CPU module and expansion slot in 1U rack servers. IC Role / Device Role / Timing Role: Octal buffer providing bidirectional signal isolation with 3-state control per bank for shared bus arbitration. Use Value: Eliminates need for discrete level shifters and reduces BOM count while supporting hot-swap via Ioff. |
Use Scenario: Driving 8 parallel column lines of a 64×32 monochrome LED matrix using multiplexed row scanning. IC Role / Device Role / Timing Role: High-current sink driver translating microcontroller GPIO to 24mA-per-line LED current with precise timing control. Use Value: Delivers consistent brightness across columns with <5.9ns skew between outputs, avoiding visible flicker. |
| Industrial I/O Expander | Network Switch Control Bus |
Use Scenario: Extending GPIO count of PLC main controller to manage 16 digital inputs/outputs across DIN-rail mounted modules. IC Role / Device Role / Timing Role: Bidirectional buffer enabling readback of sensor status and write-to-actuator signals over shared 8-bit data bus. Use Value: 5.5V input tolerance allows direct connection to 24V industrial sensors via resistive dividers; Ioff prevents fault propagation. |
Use Scenario: Routing configuration commands and status signals between switch ASIC and management MCU in Layer 2 Ethernet switches. IC Role / Device Role / Timing Role: Signal conditioner isolating noise-sensitive control lines from high-speed packet processing domains. Use Value: Low ground bounce (<0.8V) and fast edge control prevent metastability in register writes during high-throughput traffic bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH244A | Includes bus-hold circuitry on all inputs; otherwise identical voltage range, drive strength, and pinout | Eliminates need for external pull-ups on unused or floating inputs-preferred in systems with intermittent signal sources | Select SN74LVCH244A when input signal integrity is compromised by long traces or open-drain sources |
| 74LVC244APW | TSSOP-20 (PW) package; same electrical specs but 6.5mm × 6.4mm footprint and 4.4mm body height | Enables higher board density in space-constrained telecom modules where SOIC height exceeds mechanical clearance limits | Choose 74LVC244APW when PCB real estate or Z-height constraints prohibit SOIC-20 placement |
Compared with SN74LVC244ADWE4, SN74LVCH244A adds bus-hold for un-driven inputs but increases input capacitance by 1pF; 74LVC244APW offers identical performance in a smaller, thinner package-neither is pin-compatible due to differing lead pitch and thermal pad presence.
Availability
SN74LVC244ADWE4 is available at Aetrix Electronics and suitable for server backplane interfaces, LED display drivers, and industrial I/O expanders requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC244ADWE4 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets since 1930.
The SN74LVC244ADWE4 belongs to TI's LVC logic family-designed specifically for low-voltage, high-speed bus interface applications requiring mixed-voltage compatibility and robust hot-swap operation.
FAQ
What is the maximum clock frequency supported by SN74LVC244ADWE4?
The SN74LVC244ADWE4 is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay and load conditions: at 3.3V with 50pF load, tpd ≤ 5.9ns supports clean toggling up to ~85MHz (1/2 × tpd). For reliable bus operation, limit toggle rates to ≤50MHz with proper PCB layout and termination.
Does SN74LVC244ADWE4 require external pull-up resistors on its OE pins?
Yes-SN74LVC244ADWE4 OE pins are active-low and must be pulled high during power-up to ensure outputs remain in high-impedance state until firmware initializes control. A 10kΩ pull-up to VCC is recommended; TI specifies minimum pull-up strength based on Ioff leakage (≤20µA) and driver sink capability.
Can SN74LVC244ADWE4 drive 50Ω transmission lines directly?
Yes-SN74LVC244ADWE4 can source/sink ±24mA at 3V, sufficient to drive unterminated 50Ω lines with ~66Ω effective impedance. For optimal signal integrity on traces >12cm, use series damping (22–33Ω) near the SN74LVC244ADWE4 output per TI layout guidelines to suppress ringing.
Is SN74LVC244ADWE4 compatible with 5V TTL logic inputs?
Yes-SN74LVC244ADWE4 inputs tolerate up to 5.5V regardless of VCC, making it fully compatible with 5V TTL outputs. When VCC = 3.3V, VIH threshold is 2.0V (min), well below 5V logic-high levels, ensuring reliable recognition without level translation.
What thermal considerations apply to SN74LVC244ADWE4 in continuous operation?
SN74LVC244ADWE4 in SOIC-20 (DW) package has RθJA = 114.8°C/W. At 24mA per output (8 outputs active), power dissipation reaches ~120mW-raising junction temperature by ~13.7°C above ambient. Maintain ambient ≤100°C and ensure ≥1cm² copper pour under the package for reliable 125°C operation.
SN74LVC244ADWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVC244ADWE4 FAQ
1.How can I place an order for SN74LVC244ADWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244ADWE4 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 SN74LVC244ADWE4 reliable?
The price and inventory of SN74LVC244ADWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244ADWE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC244ADWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC244ADWE4 transactions.
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SN74LVC244ADWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244ADWE4 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 SN74LVC244ADWE4?
For technical support, including SN74LVC244ADWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244ADWE4 requirements.
6.How does Aetrix verify that SN74LVC244ADWE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC244ADWE4 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 SN74LVC244ADWE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC244ADWE4?
All SN74LVC244ADWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244ADWE4, 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 SN74LVC244ADWE4 part is unused and in its original packaging.
Return procedure for SN74LVC244ADWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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