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Texas Instruments SN74LV244ATRGYRG4
- Part No.:
- SN74LV244ATRGYRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74LV244ATRGYRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,499
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Product details
Overview
SN74LV244ATRGYRG4 from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs in a 20-pin VQFN (RGY) package. It operates from 4.5 V to 5.5 V, delivers typical propagation delay of 5.4 ns at 5 V, supports TTL-voltage-compatible inputs, and features Ioff partial-power-down protection. It is used in memory-address buffering, clock distribution, and bidirectional bus interfacing where space-constrained PCB layouts require high-density logic drivers.
For engineers reviewing the SN74LV244ATRGYRG4 datasheet, SN74LV244ATRGYRG4 pinout, SN74LV244ATRGYRG4 application, or SN74LV244ATRGYRG4 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for industrial bus interface and 3-state logic design.
Technical Context
The SN74LV244ATRGYRG4 implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control - 1OE for Y1–Y4 and 2OE for Y5–Y8. Its Ioff circuitry actively disables outputs during power-down, preventing backflow current when VCC = 0 V.
It supports mixed-mode voltage operation across all ports, accepts TTL-level inputs (VIH = 2 V min, VIL = 0.8 V max), and maintains guaranteed VOH ≥ 3.8 V and VOL ≤ 0.55 V under 16 mA load at VCC = 4.5 V. Output ground bounce (VOLP) remains below 0.8 V and undershoot (VOHV) exceeds 2.3 V at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic rails and tolerance against supply ripple. |
| Propagation Delay (tpd) | 5.4 ns typical at 5 V, CL = 15 pF - enables high-speed address/data buffering in microcontroller peripheral buses. |
| Output Drive | ±16 mA per output - sufficient to drive 50-pF loads across 10-cm PCB traces without signal degradation. |
| Ioff Current | <5 µA at 0–5.5 V - prevents damaging back-current during hot-insertion or partial power-down sequencing. |
| Input Compatibility | TTL-voltage level (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct interfacing with legacy 5-V microcontrollers and FPGAs without level shifters. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements for board-level handling and field deployment. |
| Thermal Impedance (θJA) | 37 °C/W (RGY package) - enables sustained operation at full drive strength in compact enclosures without forced airflow. |
Pinout & Package
SN74LV244ATRGYRG4 uses a 20-pin VQFN package (RGY) with 0.5-mm pitch, 3.5 mm × 4.5 mm body, and exposed thermal pad (Pin 21). The package requires soldering of the thermal pad for optimal thermal performance and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 17, 18, 19, 20 | A1–A4, A5–A8 (Inputs) | Eight buffered data inputs - split into two groups (A1–A4 and A5–A8) for independent 4-bit channel control. |
| 5, 6, 7, 8, 11, 12, 13, 14 | Y1–Y4, Y5–Y8 (Outputs) | Eight 3-state noninverting outputs - high-impedance when respective OE is high; otherwise mirror A-inputs. |
| 9, 15 | 1OE, 2OE (Output Enables) | Active-low enables - independently disable first or second 4-bit buffer group; tied high via pullup for power-up high-Z safety. |
| 10 | GND | Ground reference - must be low-inductance connection; shares return path with thermal pad. |
| 20 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 3 mm of pin for noise suppression. |
| 21 (Exposed Pad) | Thermal Pad / GND | Internally connected to GND - must be soldered to PCB copper pour for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ioff Partial-Power-Down Protection | Prevents reverse current flow when VCC = 0 V, enabling safe hot-swap and mixed-rail system integration. |
| TTL-Compatible Inputs | Accepts 0.8 V/2.0 V logic thresholds directly from legacy 5-V controllers - eliminates need for external level translators. |
| Low Propagation Delay | 5.4 ns typical at 5 V ensures timing margins are preserved in 20-MHz+ address/data bus applications. |
| High-Noise Immunity | VOLP < 0.8 V and VOHV > 2.3 V minimize false triggering in electrically noisy industrial environments. |
| VQFN Thermal Performance | 37 °C/W θJA enables continuous 16-mA output loading at 85°C ambient without derating. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 8-bit address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating MCU address outputs; enables multi-drop addressing with OE-controlled channel selection. Use Value: Eliminates bus contention during memory access arbitration; supports simultaneous enable/disable of upper/lower address segments. | Use Scenario: Interfacing a PLC CPU module to field I/O expansion cards over a parallel control bus. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control per 4-bit lane - manages direction and timing isolation between master and slave nodes. Use Value: Prevents signal corruption during hot-plug insertion of I/O modules; Ioff protects powered-down peripherals from backfeed. |
| Microcontroller Peripheral Expansion | Legacy System Logic Level Translation |
Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU to drive LED arrays, relays, and sensors via parallel control lines. IC Role / Device Role / Timing Role: Octal buffer providing current gain and 3-state isolation - allows dynamic reconfiguration of shared control signals. Use Value: Enables software-selectable signal routing without hardware redesign; ±16 mA drive supports direct relay coil activation. | Use Scenario: Integrating modern 5-V tolerant logic into aging instrumentation systems using TTL-level signaling. IC Role / Device Role / Timing Role: Voltage-compatible buffer translating between 3.3-V FPGA I/O and 5-V legacy bus transceivers. Use Value: Maintains signal integrity across mixed-voltage domains without external biasing or resistive dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/3-state driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V); no TTL input compatibility; 3.3-V only operation. | Suitable for modern low-voltage embedded systems but incompatible with 5-V TTL sources. | Select when migrating to 3.3-V-only designs and replacing legacy 5-V interfaces is feasible. |
| 74ACT244SCX | Higher drive (±24 mA); faster tpd (3.5 ns); requires 4.5–5.5 V; no Ioff support. | Better for speed-critical clock distribution but lacks partial-power-down capability for hot-swap use cases. | Choose for maximum timing margin in fixed 5-V systems where power sequencing is fully controlled. |
Compared with SN74LV244ATRGYRG4, SN74LVC244APWR reduces supply flexibility and removes TTL compatibility, while 74ACT244SCX improves speed and drive strength but sacrifices Ioff protection - making SN74LV244ATRGYRG4 the balanced choice for mixed-voltage, hot-pluggable industrial interfaces.
Availability
SN74LV244ATRGYRG4 is available at Aetrix Electronics and suitable for memory address buffering, industrial bus transceivers, and microcontroller peripheral expansion requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74LV244ATRGYRG4 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 specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial, automotive, and communications markets.
The SN74LV244ATRGYRG4 belongs to TI's LV-A family of low-voltage, TTL-compatible logic ICs designed specifically for robust 3-state bus interfacing in space-constrained, thermally demanding industrial control and automation systems.
FAQ
What is the recommended power-up sequence for SN74LV244ATRGYRG4 to ensure high-impedance outputs?
TI specifies that OE pins must be held high (via pullup resistor to VCC) during power-up to guarantee outputs remain in high-impedance state until valid logic levels are established. For SN74LV244ATRGYRG4, a 10-kΩ pullup per OE is typical; the minimum value depends on the driver's sink capability - typically ≥4.7 kΩ. This prevents bus contention before system initialization completes.
Does SN74LV244ATRGYRG4 support mixed-voltage operation between 3.3-V inputs and 5-V VCC?
Yes. SN74LV244ATRGYRG4 supports mixed-mode voltage operation: inputs tolerate 0–5.5 V regardless of VCC, and outputs swing rail-to-rail (0 V to VCC) when enabled. A 3.3-V controller can safely drive SN74LV244ATRGYRG4 inputs while VCC = 5 V, and outputs will deliver full 5-V logic levels - ideal for bridging voltage domains without level shifters.
What is the function of the exposed thermal pad (Pin 21) on SN74LV244ATRGYRG4?
The exposed thermal pad (Pin 21) on SN74LV244ATRGYRG4 is internally connected to GND and must be soldered to a PCB copper pour for effective heat dissipation and mechanical stability. TI requires this connection to achieve the rated θJA of 37 °C/W; omitting it degrades thermal performance by >40% and risks solder joint fatigue under thermal cycling.
Can SN74LV244ATRGYRG4 replace SN74LV244ADR in a design using SOIC-20 packaging?
No - SN74LV244ATRGYRG4 uses a 20-pin VQFN (RGY) package with 0.5-mm pitch and exposed thermal pad, while SN74LV244ADR uses SOIC-20 (DW) with 1.27-mm pitch and no thermal pad. They are not pin-compatible: footprint, soldering process, thermal management, and layout rules differ fundamentally. Migration requires PCB redesign and validation of signal integrity and thermal performance.
What is the maximum capacitive load SN74LV244ATRGYRG4 can drive while maintaining specified propagation delay?
SN74LV244ATRGYRG4 is characterized up to 50 pF load capacitance. At CL = 50 pF and VCC = 5 V, typical tPLH/tPHL is 5.9 ns (max 8.9 ns), and enable/disable times remain within spec (tPZH/tPHZ ≤ 11.4 ns). Driving >50 pF increases delay nonlinearly and may cause ringing; for heavier loads, add series termination or reduce trace length to maintain timing compliance.
SN74LV244ATRGYRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
SN74LV244ATRGYRG4 FAQ
1.How can I place an order for SN74LV244ATRGYRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ATRGYRG4 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 SN74LV244ATRGYRG4 reliable?
The price and inventory of SN74LV244ATRGYRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ATRGYRG4 is usually 5 days.
3.What payment methods are accepted for SN74LV244ATRGYRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV244ATRGYRG4 transactions.
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4.How is shipping managed for SN74LV244ATRGYRG4?
SN74LV244ATRGYRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ATRGYRG4 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 SN74LV244ATRGYRG4?
For technical support, including SN74LV244ATRGYRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ATRGYRG4 requirements.
6.How does Aetrix verify that SN74LV244ATRGYRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LV244ATRGYRG4 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 SN74LV244ATRGYRG4 meets industry standards.
7.What is the process for return or replacement of SN74LV244ATRGYRG4?
All SN74LV244ATRGYRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ATRGYRG4, 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 SN74LV244ATRGYRG4 part is unused and in its original packaging.
Return procedure for SN74LV244ATRGYRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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