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Texas Instruments SN74LVC244ADWR
- Part No.:
- SN74LVC244ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC244ADWR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:23,336
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Product details
Overview
SN74LVC244ADWR 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, LED display drivers, and telecom switch control planes.
For engineers reviewing the SN74LVC244ADWR datasheet, SN74LVC244ADWR pinout, SN74LVC244ADWR application, or SN74LVC244ADWR equivalent, this page delivers verified electrical specs, package mapping to SOIC-20 (DW), functional mode behavior, thermal derating data, and real-world signal integrity guidance for high-speed trace routing and damping resistor selection.
Technical Context
The SN74LVC244ADWR implements two independent 4-bit noninverting buffers with separate 3-state output enables (1OE, 2OE), each controlling four outputs (1Y1–1Y4, 2Y1–2Y4). Its CMOS input structure accepts up to 5.5V regardless of VCC, enabling mixed-voltage translation between 5V peripherals and 3.3V system controllers.
Each output delivers ±24mA drive at 3.0V VCC while maintaining balanced sourcing/sinking capability and low ground bounce (<0.8V typical VOLP). The device supports partial power-down via Ioff, limiting leakage to ±20µA when VCC = 0V-critical for hot-swap and back-drive protection in modular systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables operation across LVC logic families and compatibility with 1.8V/2.5V/3.3V domains. |
| Input Voltage Tolerance | Up to 5.5V - Allows direct connection to 5V legacy signals without level-shifting circuitry. |
| Max Propagation Delay | 5.9ns at 3.3V - Supports >100MHz bus timing margins for short-trace interconnects. |
| Output Drive Strength | ±24mA at 3.0V - Sustains clean edges into 50Ω loads and drives longer PCB traces without external buffering. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and extended-temperature embedded applications. |
| Ioff Leakage | ±20µA at VCC = 0V - Prevents back-driving and enables safe live insertion into powered backplanes. |
| ESD Rating | ±2000V HBM - Meets JEDEC JS-001 for robust handling in automated assembly environments. |
Pinout & Package
SN74LVC244ADWR is packaged in a 20-pin SOIC (DW) body measuring 12.80mm × 10.3mm, with 7.50mm body width excluding leads. Thermal performance includes RθJA = 114.8°C/W and RθJC(top) = 84.1°C/W, requiring board-level copper pour and bypass capacitor placement per TI layout guidelines.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Port 1A1–1A4, 2A1–2A4 inputs | Eight independent CMOS inputs grouped into two 4-bit banks; tolerate 5.5V regardless of VCC. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Port 1Y1–1Y4, 2Y1–2Y4 outputs | Eight 3-state CMOS outputs with balanced ±24mA drive; enter high-Z when corresponding OE is high. |
| 1, 19 | 1OE, 2OE enable inputs | Active-low controls for each 4-bit bank; tie to VCC via pull-up for power-up high-Z safety. |
| 10, 20 | GND, VCC | Single ground and supply pin pair; requires local 0.1µF ceramic bypass capacitor placed adjacent to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables 5V-to-3.3V down-translation on all ports without external components-reduces BOM count in heterogeneous voltage systems. |
| Ioff partial-power-down | Prevents current flow from powered sections into unpowered ones during hot-swap events, eliminating risk of latch-up or damage. |
| Balanced CMOS 3-state outputs | Delivers matched rise/fall times and symmetric drive strength, minimizing skew in parallel bus applications like address/data latching. |
| Low ground bounce (VOLP) | Typical <0.8V at 3.3V ensures stable reference for downstream receivers even under heavy capacitive loading. |
| Ultra-fast switching | 5.9ns tpd at 3.3V supports reliable operation in sub-10ns timing windows-critical for DDR clock forwarding and FPGA I/O expansion. |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
|
Use Scenario: Isolating and driving address/data lines between CPU module and PCIe expansion slots in rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer providing isolation, noise immunity, and fan-out amplification for 3.3V buses. Use Value: Eliminates contention during hot-plug events using Ioff and enables 5V-compatible management interfaces without level shifters. |
Use Scenario: Driving 16-segment column lines in large-format outdoor LED signage with long PCB traces (>12cm). IC Role / Device Role / Timing Role: High-current noninverting driver translating microcontroller GPIO to segment sink current. Use Value: ±24mA output drive sustains brightness across 50Ω trace impedance; fast edges reduce ghosting in multiplexed displays. |
| Telecom Switch Control Plane | Industrial I/O Expander |
|
Use Scenario: Interfacing FPGA-based control logic with legacy 5V relay driver boards in carrier-grade network switches. IC Role / Device Role / Timing Role: Voltage translator and bus isolator enabling interoperability between 3.3V logic and 5V actuation circuits. Use Value: 5.5V-tolerant inputs accept 5V control signals directly; 3-state outputs prevent bus contention during firmware updates. |
Use Scenario: Adding 8-bit parallel digital I/O to PLC mainboards where microcontroller GPIO is exhausted. IC Role / Device Role / Timing Role: General-purpose buffer expanding host MCU port capability with configurable enable control. Use Value: Dual OE pins allow independent gating of two 4-bit groups-enabling time-multiplexed sensor readout or actuator sequencing. |
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; higher ICC (max 40µA vs. 10µA); same VCC range and pinout. | Preferred where floating inputs must be avoided without external pull resistors-e.g., in noisy industrial environments. | Select SN74LVCH244A only if bus-hold functionality is required; otherwise SN74LVC244ADWR offers lower quiescent current and identical interface behavior. |
| 74LVC244APW | TSSOP-20 package (6.5mm × 6.4mm); identical electrical specs but different thermal metrics (RθJA = 120.3°C/W). | Better suited for space-constrained designs where SOIC footprint is prohibitive; requires adjusted thermal layout due to higher junction-to-ambient resistance. | Choose 74LVC244APW for compact layouts; use SN74LVC244ADWR when board area allows and thermal margin favors SOIC's lower RθJA. |
Compared with SN74LVCH244A and 74LVC244APW, SN74LVC244ADWR provides optimal balance of low ICC, proven SOIC manufacturability, and thermal performance-making it the preferred choice for cost-sensitive, thermally stable industrial and telecom applications where bus-hold is unnecessary and board space permits.
Availability
SN74LVC244ADWR is available at Aetrix Electronics and suitable for server backplane interface, LED display column driving, and telecom switch control plane applications requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for SN74LVC244ADWR 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 with emphasis on reliability, precision, and energy efficiency.
The SN74LVC244ADWR belongs to TI's LVC logic family-designed specifically for low-voltage, high-speed bus interfacing in industrial, telecom, and computing infrastructure where mixed-voltage compatibility and robust ESD performance are critical.
FAQ
What is the maximum operating temperature for SN74LVC244ADWR?
The SN74LVC244ADWR is rated for operation from –40°C to +125°C across all packages except BGA, which is limited to –40°C to +85°C. This extended temperature range makes SN74LVC244ADWR suitable for industrial control cabinets, base station equipment, and automotive under-hood modules where ambient heat exceeds standard commercial limits.
Does SN74LVC244ADWR support 5V input signals while powered at 3.3V?
Yes, SN74LVC244ADWR accepts input voltages up to 5.5V regardless of VCC level-enabling direct interfacing with 5V peripherals without external level shifters. This capability is explicitly specified in the Recommended Operating Conditions table and validated across the full temperature range.
What is the recommended bypass capacitor for SN74LVC244ADWR?
A 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) is recommended for SN74LVC244ADWR. TI advises paralleling with a 1µF capacitor to suppress broadband noise, and layout guidelines specify short, wide traces and shared board-side placement to minimize inductance and ensure stable power delivery.
How does the Ioff feature function in SN74LVC244ADWR?
In SN74LVC244ADWR, Ioff disables all outputs when VCC = 0V, limiting leakage current to ±20µA per pin. This prevents back-driving of powered circuitry during hot-swap operations and protects against unintended current paths in partially powered systems-verified per JESD78 and included in Absolute Maximum Ratings.
Can SN74LVC244ADWR be used as a level translator?
Yes, SN74LVC244ADWR functions as a unidirectional down-translator: 5.5V-tolerant inputs accept higher-voltage signals while outputs swing rail-to-rail between GND and the applied VCC (1.65V–3.6V). It does not support bidirectional translation or voltage boosting-only 5V→3.3V/2.5V/1.8V signal conditioning.
SN74LVC244ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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
SN74LVC244ADWR FAQ
1.How can I place an order for SN74LVC244ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244ADWR 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 SN74LVC244ADWR reliable?
The price and inventory of SN74LVC244ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244ADWR is usually 5 days.
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SN74LVC244ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244ADWR 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 SN74LVC244ADWR?
For technical support, including SN74LVC244ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244ADWR requirements.
6.How does Aetrix verify that SN74LVC244ADWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC244ADWR 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 SN74LVC244ADWR meets industry standards.
7.What is the process for return or replacement of SN74LVC244ADWR?
All SN74LVC244ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244ADWR, 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 SN74LVC244ADWR part is unused and in its original packaging.
Return procedure for SN74LVC244ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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